WO2016129692A1 - Damper device - Google Patents

Abstract

A partially-toothed gear (38) forming a gear train (32) of a damper device (1) is equipped with an arc-shaped outer circumferential section (52) having an outer circumferential surface (52a) with the same diameter as the addendum circle (51a) of tooth parts 51 in the circumferential direction. A sector gear (39) driven by the partially-toothed gear (38) is equipped with a first tooth (68), the portion of which that faces the outer circumferential surface 52a has been cut away, and which is capable of entering into the addendum circle (51a) at the other side X2 in the X direction of the arc-shaped outer circumferential section (52), and a second tooth (69), which is adjacent to the first tooth (68) and is capable of making contact with the outer circumferential surface (52a) when the first tooth (68) enters into the addendum circle (51a). The second tooth (69) is cut away from the tooth-tip side, from the end on the other side X2 toward the one side X1 in the X direction, and the tooth end surface (69a) thereof is in the same plane as the arc-shaped outer circumferential section (52).

Description

Damper device

This invention relates to the damper apparatus which opens and closes an opening part with a baffle.

A damper device that opens and closes an opening part of a cold air passage of a refrigerator with a baffle is described in Patent Document 1. The damper device of the same document rotates a baffle by a drive mechanism including a stepping motor and a train wheel. The baffle moves between a closed position that closes the opening and an open position that opens the opening. The train wheel includes a missing gear and a sector gear driven by the missing gear.

The toothless gear includes an outer peripheral portion having an outer peripheral surface along a tip circle of the tooth portion at a position adjacent to the tooth portion in the circumferential direction. The outer peripheral part has an end face that is shorter in the axial direction than the tooth width of the tooth part and faces one side in the axial direction at a position in the middle of the tooth part in the axial direction. In the sector gear, the portion facing the outer peripheral surface of the outer peripheral portion of the toothless gear is notched, and the first tooth that can enter the inner peripheral side of the tip circle on one side in the axial direction on the end surface of the outer peripheral portion is provided. Prepare. The sector gear includes second teeth that are located next to the first teeth and that can contact the outer peripheral surface of the outer peripheral portion when the first teeth enter the inner peripheral side of the addendum circle. The sector gear is an output gear and is connected to a baffle.

In a state where the baffle is disposed at the closed position and the toothless gear is stopped, the first tooth of the sector gear enters the inner peripheral side of the tip circle on one side in the axial direction on the end face of the outer peripheral portion. Moreover, the 2nd tooth | gear of a sector gear contact | abuts on the outer peripheral surface of an outer peripheral part. Here, when the second tooth comes into contact with the outer peripheral portion, the contact prevents the sector gear from rotating in the direction of opening the baffle. Therefore, in the damper device of Patent Document 1, the baffle arranged at the closed position does not move to the open position side.

JP 2003-240102 A

FIG. 13 is a perspective view and a plan view of a toothless gear and a sector gear that can be employed in the train wheel of the baffle drive mechanism described in the cited document 1. In FIG. 13, the toothless gear 38 includes an arcuate outer peripheral portion 52 having a concentric outer peripheral surface 52 a having the same diameter as the tooth tip circle 51 a of the tooth portion 51 at a position adjacent to the tooth portion 51 in the circumferential direction. The sector gear 39 has a notch in a portion where the tooth (first tooth 68) located at one end in the circumferential direction faces the outer peripheral surface 52 a of the arcuate outer peripheral portion 52 of the toothless gear 38.

The state shown in FIG. 13 is a state in which the baffle is disposed at the closed position and the intermittent gear is stopped. In this state, the first teeth 68 of the sector gear 39 have entered the inner peripheral side of the addendum circle 51a on one side of the end surface 52b of the arcuate outer peripheral portion 52 in the direction of the rotation center axis L1 of the toothless gear 38. . Further, the second teeth 69 of the sector gear 39 are in contact with the outer peripheral surface 52 a of the arc-shaped outer peripheral portion 52. Thereby, the sector gear 39 is prevented from rotating in the first rotation direction B1 (rotation direction for opening the baffle).

When the baffle in the closed position is moved to the open position, the toothless gear 38 is rotated in the first rotation direction A1 by driving the stepping motor. Accordingly, when the toothless gear 38 starts to rotate, the tooth 53 (the tooth at the front end in the first rotation direction A1) located closest to the arcuate outer peripheral portion 52 in the toothless gear 38 is the outer periphery of the arcuate outer peripheral portion 52. The first tooth 68 and the second tooth 69 are engaged with each other beyond the second tooth 69 of the sector gear that is in contact with the surface 52a.

Here, as shown in FIG. 13, when the rotation center axis L <b> 2 of the sector gear 39 is inclined due to the force acting on the sector gear 39 from the baffle side, component tolerance, or the like, One end 69c in the direction of the axis L1 of the second tooth 69 of the sector gear 39 in contact with the outer peripheral surface 52a is located on one side of the end surface 52b of the arcuate outer peripheral portion 52 in the direction of the axis L1. It may enter the inner peripheral side of the tip circle 51a. In this case, when the tooth 53 of the toothless gear 38 tries to exceed the second tooth 69 of the sector gear, the tooth 53 of the toothless gear 38 interferes with the second tooth 69 to generate an abnormal noise. Let

In view of this point, the problem of the present invention is that when the sector gear and the partial gear start to mesh, the sector gear and the partial gear interfere with each other even when the rotation center axis of the sector gear is inclined. An object of the present invention is to provide a damper device that can prevent or suppress the occurrence of abnormal noise.

In order to solve the above problems, a damper device of the present invention includes a baffle for opening and closing an opening, a motor, and a train wheel that transmits rotation of the motor to the baffle. A segment gear, and a sector gear that meshes with the segment gear and is driven by the segment gear, and the segment gear is disposed at a position adjacent to the tooth portion in the circumferential direction. An outer peripheral portion having an outer peripheral surface of an arc along the tip circle, the outer peripheral portion having a length in the axial direction shorter than a tooth width of the tooth portion, and at a position in the middle of the tooth portion in the axial direction. An end surface facing one side in the axial direction is provided, and the sector gear is cut out at a portion facing the outer peripheral surface, and can enter the inner peripheral side of the tip circle on one side in the axial direction on the end surface. The first tooth and the first tooth located next to the first tooth within the tip circle Second teeth that can come into contact with the outer peripheral surface when entering the side, and the second teeth are notched from the tip side toward the other side from one end in the axial direction. It is characterized by.

According to the present invention, when the first tooth of the sector gear enters the inner peripheral side of the addendum circle on one side in the axial direction on the end face of the outer peripheral portion of the toothless gear, the second tooth of the sector gear becomes the outer periphery of the outer peripheral portion. The rotation of the sector gear is restricted by contacting the surface. Therefore, for example, when the baffle is arranged at the closed position that closes the opening, the first tooth enters the inner peripheral side of the tip circle of the missing gear and the second tooth contacts the outer peripheral surface of the outer peripheral part. As a result, the sector gear can be prevented from rotating in the opening direction to open the baffle.

Here, the second tooth of the sector gear is cut out from the tooth tip side toward the other side from one end in the axial direction. Therefore, even when the rotation center axis of the sector gear is inclined, one end portion in the axial direction of the second tooth in contact with the outer peripheral surface of the outer peripheral portion is on one side in the axial direction on the end surface of the arc-shaped outer peripheral portion. It can prevent or suppress entering into the inner peripheral side of a tip circle. Therefore, when the teeth on the outermost peripheral portion of the missing gear start to rotate and mesh with the first teeth and the second teeth of the sector gear, the teeth of the missing gear and the second teeth. It is possible to prevent or suppress the generation of abnormal noise due to interference with the teeth.

In the present invention, it is desirable that a tooth end surface on one side in the axial direction of the second tooth is located on the same plane as the end surface or on the other side in the axial direction from the end surface. If it does in this way, the 2nd tooth of a sector gear does not have the part which protrudes in the one side of an axial direction rather than the end face of the peripheral part of a part-tooth gear. Therefore, even when the rotation center axis of the sector gear is inclined, the second tooth does not enter the inner peripheral side of the tooth tip circle on one side in the axial direction on the end face of the outer peripheral portion. Therefore, when the segmented gear and the sector gear start to mesh, the teeth of the segmented gear and the second teeth can be prevented from interfering with each other to generate abnormal noise.

In the present invention, it is preferable that the most teeth on the outer peripheral portion side of the tooth portion have a curvature of the first tooth surface opposite to the outer peripheral portion smaller than that of the second tooth surface on the outer peripheral portion side. In this way, the second tooth is brought into sliding contact with the first tooth surface when a force that rotates the sector gear in a direction in which the rotation of the sector gear is restricted is applied to the sector gear in the rotation restricted state. It is possible to prevent the sector gear from rotating rapidly. Therefore, it can prevent or suppress that the members which comprise a train wheel contact suddenly and generate abnormal noise.

In this case, it is desirable that the tooth surface of the tooth on the most outer peripheral side in the tooth portion is a curved surface continuous from the first tooth surface side to the second tooth surface. In this way, when the force that rotates the sector gear in the direction in which the rotation of the sector gear is restricted is applied to the sector gear in the rotation restricted state, the second tooth moves from the curved surface to the first tooth surface. It is possible to prevent the sector gear from rotating rapidly in sliding contact.

In the present invention, when the baffle is disposed at a closed position for closing the opening, the first tooth enters the inner peripheral side of the tip circle on one side of the end surface of the outer peripheral portion in the axial direction. Then, the second tooth can be prevented from rotating in the direction of opening the baffle when the second gear contacts the outer peripheral surface. If it does in this way, it can suppress that the baffle arrange | positioned in an open position receives fluid pressure and flutters. Here, when a stepping motor is used as the motor, there are cases where the motor is further driven in a plurality of steps even after the baffle is disposed at the closed position in order to reliably close the opening by the baffle. In such a case, the baffle easily flutters due to the step-out generated by the stepping motor. For such a problem, if the fan gear is prevented from rotating in the direction of opening the baffle when the baffle is disposed at the closed position, this fluttering can be suppressed.

In this invention, it has a frame provided with the said opening part, The said baffle is provided with the elastic member which can seal the said opening part, The said elastic member is a said frame when the said baffle is arrange | positioned in the said closed position. It can be elastically deformed by coming into contact with the opening edge of the opening. In this way, the opening can be reliably closed by the baffle. Here, the shape restoring force of the elastically deformed elastic member acts as a force for rotating the sector gear in the direction of opening the baffle, but the sector gear rotates in the direction of opening the baffle when the baffle is arranged at the closed position. It is blocked. Therefore, the baffle does not move in the direction of opening the opening from the closed position by the shape restoring force of the elastic member.

In the present invention, the sector gear may be an output gear connected to the baffle.

In the present invention, it is preferable that the first tooth is one of a plurality of teeth meshing with the missing gear. That is, the sector gear can include a plurality of first teeth, but if the first tooth is one, the sector gear can be made compact in the circumferential direction.

In this invention, it has a case which accommodates the said motor, The said case is provided with the cylinder part which supports the said fan-shaped gear rotatably, The said fan-shaped gear is larger than a shaft part and the said shaft part, and the said axis | shaft is large. A large-diameter shaft portion that extends coaxially with the portion, an annular surface that faces the shaft portion between the shaft portion and the large-diameter shaft portion, and a plurality of teeth that can mesh with the toothless gear on the outer peripheral surface An arc portion and a connecting portion that protrudes from the large-diameter shaft portion to the outer peripheral side and connects the large-diameter shaft portion and the arc portion, and the plurality of teeth include the first tooth and the second tooth Teeth are included, and the shaft portion has a longer height in the axial direction of the shaft portion than the diameter of the shaft portion, and the shaft portion is inserted into the tube portion so as to be rotatable. In addition, it is desirable that the annular surface is in contact with the opening edge of the cylindrical portion. In this way, since the length dimension of the shaft portion supported by the cylinder portion can be secured, it is possible to prevent or suppress the sector gear from tilting when the sector gear is supported by the cylinder portion.

Here, if the length of the shaft portion supported by the tube portion is increased, it becomes easy to prevent the sector gear from being inclined. However, when the length of the shaft is increased, stress is concentrated on the tip of the shaft supported by the tube when a force is applied to the sector gear from the direction intersecting the axis. The shaft part may be damaged. In order to avoid such a situation, it is desirable that the height of the shaft portion is not more than twice the diameter of the shaft portion.

In the present invention, the case includes a blocking portion that blocks an opening of the cylindrical portion on a side opposite to the side on which the shaft portion is inserted, and the sector gear has one end on a tip surface of the shaft portion. It is desirable to provide an air flow path that opens and the other end opens on the outer peripheral surface of the large-diameter shaft portion. If the case includes a blocking portion that blocks the opening of the cylindrical portion, the rigidity of the cylindrical portion that functions as a bearing of the sector gear is improved. Therefore, even when a force is applied to the sector gear from the direction intersecting the axis, the sector gear can be supported by the cylindrical portion without being inclined. Here, when the shaft portion of the sector gear is inserted into the cylindrical portion whose bottom is provided by the blocking portion and is rotatably fitted, the air in the space defined by the cylindrical portion and the blocking portion is released from the space. In some cases, the fan-shaped gear cannot escape and the annular end surface of the fan gear is lifted from the opening edge of the cylindrical portion. On the other hand, the sector gear is provided with an air flow path that communicates the front end surface of the shaft portion and the outer peripheral surface of the large diameter shaft portion, and this air flow passage is provided when the shaft portion of the sector gear is inserted into the cylinder portion. The space defined by the cylinder part and the sealing part is communicated with the outside. Accordingly, when the shaft portion of the sector gear is inserted into the cylindrical portion, the air in the space defined by the cylindrical portion and the blocking portion escapes outside through the air flow path. Therefore, the sector gear is reliably supported by the cylindrical portion.

According to the present invention, when the first tooth of the sector gear enters the inner peripheral side of the addendum circle on one side in the axial direction on the end face of the outer peripheral portion of the toothless gear, the second tooth of the sector gear becomes the outer periphery of the outer peripheral portion. The rotation of the sector gear is restricted by contacting the surface. Moreover, the 2nd tooth is notched from the tooth | gear tip side toward the other side from the edge of one side of an axial direction. Therefore, even when the rotation center axis of the sector gear is inclined, one end portion in the axial direction of the second tooth in contact with the outer peripheral surface of the outer peripheral portion is on one side in the axial direction on the end surface of the arc-shaped outer peripheral portion. It can prevent or suppress entering into the inner peripheral side of a tip circle. Therefore, when the tooth on the outermost peripheral portion side of the missing gear starts to rotate and meshes between the first tooth and the second tooth of the sector gear, the tooth of the missing gear and the second tooth It is possible to prevent or suppress the generation of abnormal noise due to interference with the teeth.

It is a perspective view of a damper device to which the present invention is applied. It is an exploded perspective view of a damper device to which the present invention is applied. It is the top view and exploded perspective view of a geared motor which removed the lid. It is the perspective view and top view of a part-tooth gear and a sector gear. It is a perspective view of a part-tooth gear and a perspective view of a sector gear. It is explanatory drawing of the tooth surface shape of the tooth | gear of a missing gear. It is explanatory drawing of the opening / closing operation | movement of the opening part by a damper apparatus. It is a graph which shows the angle change of the common normal line of the tooth | gear of a part-tooth gear, and the tooth | gear of a sector gear. It is a perspective view of the sector gear of the modification 1. It is explanatory drawing of the geared motor in the damper apparatus of Example 2. FIG. It is an expanded view of the train wheel which transmits rotation of a motor and a motor. It is the perspective view and sectional drawing of a sector gear. It is explanatory drawing when the sector gear of a conventional shape and a part-tooth gear start meshing.

Hereinafter, a damper device for a refrigerator to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a perspective view of a damper device to which the present invention is applied as viewed from the side where a baffle is disposed. FIG. 1A shows a state where the opening is open, and FIG. 1B shows a state where the opening is closed. FIG. 2 is an exploded perspective view of the damper device of FIG. In the following description, the rotation center axis of the baffle 2 in the damper device 1 is L0, the direction along the rotation center axis L0 is the X direction, and the opening 3 that is opened and closed by the baffle 2 is orthogonal to the X direction. A direction is a Z direction, and a direction orthogonal to the X direction and the Z direction is a Y direction. Also, one side in the X direction is X1, the other side in the X direction is X2, one side in the Y direction is Y1, the other side in the Y direction is Y2, one side in the Z direction is Z1, and Let the other side be Z2.

As shown in FIG. 1A, the damper device 1 includes a frame 5 having a rectangular opening 3 that opens in the Z direction, and a baffle 2 that opens and closes the opening 3 of the frame 5. Moreover, the damper apparatus 1 is provided with the baffle drive mechanism 6 which drives the baffle 2, as shown in FIG. The baffle drive mechanism 6 includes a drive chamber 9 defined by a lid 7 provided integrally with the frame 5 on one side X1 in the X direction of the frame 5 and a case 8 that covers the lid 7 from the one side X1 in the X direction. It is stored in. The case 8, the lid 7 and the baffle drive mechanism 6 constitute a geared motor 10. The frame 5, the lid 7 and the case 8 are made of resin.

As shown in FIG. 1 (a), the frame 5 includes a rectangular end plate portion 12 in which an opening 3 is formed, and a rectangular tube-like body protruding from the outer edge of the end plate portion 12 to the other side Z2 in the Z direction. Part 13. The lid 7 is provided integrally with the body 13 on the other side X2 of the body 13 in the X direction. At the edge of the opening 3 in the end plate 12, a rectangular tube-shaped seal plate 14 protruding toward the side where the baffle 2 is located is provided.

Here, the state where the baffle 2 is disposed at the open position 2A where the opening 3 is opened is the state shown in FIG. 1A, and the baffle 2 is in a posture orthogonal to the end plate portion 12. The state in which the baffle 2 is disposed at the closed position 2 </ b> B that closes the opening 3 is the state illustrated in FIG. 1B, and the baffle 2 extends in parallel with the end plate portion 12. The baffle 2 rotates between the closed position 2B and the open position 2A within an angle range of 90 °.

The baffle 2 is brought into contact with the seal plate portion 14 from the other side Z2 in the Z direction to close the opening 3. A heater 15 is attached to the surface of the end plate portion 12 on the side where the baffle 2 is located so as to surround the opening 3 (the seal plate portion 14).

The baffle 2 has an opening / closing plate 19 having a large rectangular flat plate portion 18 larger than the opening 3 and a rectangular elastic member 20 attached to the surface of the flat plate portion 18 on the opening 3 side. The elastic member 20 has a sheet shape and is made of polyurethane foam or the like. When the baffle 2 is disposed at the closed position 2B, the elastic member 20 comes into contact with the seal plate portion 14 and elastically deforms.

Further, the baffle 2 includes a first shaft portion 21 in which an output shaft 6a (see FIG. 2) of the baffle driving mechanism 6 is inserted into an end portion on the other side X2 in the X direction at an end portion on the one side Y1 in the Y direction. Prepare. Further, the baffle 2 includes a second shaft portion 22 that is rotatably supported by the body portion 13 at the end portion on the one side X1 in the X direction in the end portion on the one side Y1 in the Y direction. When the baffle driving mechanism 6 is driven, the baffle 2 rotates around the rotation center axis L0 coaxial with the first shaft portion 21 and the second shaft portion 22 to open and close the opening 3.

The damper device 1 is disposed inside a duct that forms a cool air passage of the refrigerator. The cold air flows through the opening 3 from the side opposite to the side where the baffle 2 is disposed with respect to the opening 3. Alternatively, it flows through the opening 3 from the side where the baffle 2 is disposed with respect to the opening 3.

(Geared motor)
FIG. 3 is an explanatory view of the geared motor 10 with the lid 7 removed. 3A is a plan view when the geared motor 10 is viewed from one side X1 in the X direction, and FIG. 3B is an exploded perspective view of the geared motor 10. FIG. The case 8 of the geared motor 10 includes a bottom plate portion 25 that extends in the Y direction and the Z direction, and a rectangular tube-shaped case body portion 26 that protrudes from the bottom plate portion 25 toward the lid 7 (one side X1 in the X direction).

The baffle drive mechanism 6 is housed in the case 8. The baffle drive mechanism 6 includes a motor 31 and a wheel train 32 that transmits the rotation of the motor 31 to the baffle 2. The motor 31 is a stepping motor, and its output shaft 31a is oriented toward one side X1 in the X direction. A pinion 33 is attached to the output shaft 31 a of the motor 31.

The train wheel 32 includes a pinion 33, a first wheel 34 provided with a large diameter gear meshing with the pinion 33, and a second wheel 35 provided with a large diameter gear meshing with a small diameter gear (not shown) of the first wheel 34. A drive gear 36 that meshes with a small-diameter gear of the second wheel & pinion 35 is provided. In the train wheel 32, the first wheel 34, the second wheel 35, and the drive gear 36 constitute a reduction wheel train. The drive gear 36 includes a large-diameter gear 37 that meshes with the small-diameter gear of the second wheel 35, and a missing gear 38 that is provided integrally and concentrically with the large-diameter gear 37 on one side X1 of the large-diameter gear 37 in the X direction. Prepare.

Further, the train wheel 32 has a sector gear 39 that meshes with the toothless gear 38 of the drive gear 36 and is driven by the drive gear 36. The sector gear 39 is a final gear (output gear) positioned at the final stage of the train wheel 32 and includes an output shaft 6 a connected to the baffle 2. The first wheel 34, the second wheel 35, the drive gear 36, and the sector gear 39 are rotatably supported by the bottom plate portion 25 of the case 8 with the rotation center axis line in the X direction.

(Drive gear)
FIG. 4A is a perspective view of the drive gear 36 and the sector gear 39 as seen from the side of the toothless gear 38 of the drive gear 36, and FIG. 4B is a diagram of the drive gear 36 and the sector gear 39 of the drive gear 36. FIG. 4C is a plan view of the drive gear 36 and the sector gear 39 viewed from the side of the toothless gear 38. FIG. 5A is a perspective view of the drive gear 36, and FIG. 5B is a perspective view of the sector gear 39. FIG. 6A is an explanatory diagram of the tooth surface shape of the teeth of the toothless gear 38, and FIG. 6B is a reference diagram showing the shape of the teeth of a general toothless gear. The state shown in FIGS. 4 and 6 is a state in which the baffle 2 is disposed at the closed position 2B.

As shown in FIGS. 4 and 5A, the drive gear 36 has a large-diameter gear 37 made of a spur gear and a smaller diameter than the large-diameter gear 37 from the other side X2 in the X direction to the one side X1. The partial gear 38 is provided in this order. Further, the drive gear 36 includes a shaft hole 43 that extends through the large-diameter gear 37 and the toothless gear 38. A support shaft 44 (see FIG. 3B) that protrudes from the bottom plate portion 25 of the case 8 to the one side X1 in the X direction is inserted into the shaft hole 43. As a result, the drive gear 36 can rotate about the axis L1 of the support shaft 44 (about the axis L1 of the shaft hole 43). The axis L1 of the support shaft 44 is the rotation center axis L1 of the drive gear 36.

As shown in FIG. 4B, the end surface 37 a on the other side X <b> 2 in the X direction facing the bottom plate portion 25 in the large-diameter gear 37 is concentric with the shaft hole 43 around the shaft hole 43 within a predetermined angle range. An arc groove 45 having a constant width is formed. An arc-shaped protrusion 46 (see FIG. 3B) that is formed concentrically with the support shaft 44 in the bottom plate portion 25 of the case 8 and protrudes to one side X1 in the X direction is inserted into the arc groove 45. As a result, the drive gear 36 extends from the position where the arc-shaped protrusion 46 abuts on one inner peripheral end surface 45a in the circumferential direction on the inner peripheral surface of the arc groove 45 to the position where it contacts the other inner peripheral end surface 45b. The rotation is allowed. That is, the arc groove 45 of the large-diameter gear 37 and the arc-shaped protrusion 46 of the case 8 constitute a rotation angle range regulating mechanism 47 that regulates the rotation angle range of the drive gear 36.

Here, the first rotation direction A1 of the drive gear 36 indicated by an arrow A1 in FIG. 4 is a rotation direction for rotating the baffle 2 in the opening direction. When the drive gear 36 rotates in the first rotation direction A1, the sector gear 39 driven by the drive gear 36 rotates in the first rotation direction B1 indicated by an arrow B1 in FIG. On the other hand, the second rotation direction A2 of the drive gear 36 indicated by an arrow A2 in FIG. 4 is a rotation direction for rotating the baffle 2 in the closing direction. When the drive gear 36 rotates in the first rotation direction A1, the sector gear 39 following the drive gear 36 rotates in the second rotation direction B2 indicated by an arrow B2 in FIG. In the state where the baffle 2 is disposed at the closed position 2B, as shown in FIG. 4C, the inner peripheral end face 45a of the arc groove 45 of the large-diameter gear 37 and the arc-shaped protrusion 46 of the case 8 are in contact with each other. Touch. Therefore, the rotation angle range restriction mechanism 47 restricts the drive gear 36 from rotating further in the second rotation direction A2 (rotation direction for closing the baffle).

As shown in FIG. 4C and FIG. 5A, the toothless gear 38 includes a tooth portion 51 over a predetermined angle range narrower than 180 °. The toothless gear 38 includes an arc-shaped outer peripheral portion (outer peripheral portion) 52 having an arc outer peripheral surface 52a along the tip circle 51a of the tooth portion 51 at a position adjacent to the tooth portion 51 in the circumferential direction. The arcuate outer peripheral portion 52 is formed concentrically and concentrically with the tip circle 51a of the tooth portion 51, and extends along the rotation center axis L1 of the drive gear 36 from the end surface on one side X1 of the large diameter gear 37 in the X direction. Projecting along the X direction. The outer peripheral surface 52a of the arc-shaped outer peripheral portion 52 overlaps the tooth tip circle 51a of the tooth portion 51 when viewed from the direction of the rotation center axis L1. In addition, the arc-shaped outer peripheral portion 52 has a length in the X direction that is shorter than a tooth width of the tooth portion 51 (the length of the tooth portion 51 in the X direction), and is positioned in the middle of the tooth portion 51 in the X direction. An end face 52b facing the one side X1 (one side in the direction of the rotation center axis L1) is provided.

Here, among the plurality of teeth constituting the tooth portion 51 of the toothless gear 38, the tooth 53 on the most arcuate outer peripheral portion 52 side is the side of the arcuate outer peripheral portion 52 as shown in FIG. The curvature of the first tooth surface 53a on the opposite side is smaller than the curvature of the second tooth surface 53b on the arcuate outer peripheral portion 52 side. Further, the tooth surface of the tooth 53 forms a curved surface in which the outer peripheral portion 53c located on the outermost peripheral side is continuous with the first tooth surface 53a, and is inflected only between the outer peripheral portion 53c and the second tooth surface 53b. Part exists. Therefore, the tooth 53 on the most arcuate outer peripheral portion 52 side in the tooth portion 51 includes a curved surface 53d continuous from the first tooth surface 53a side to the second tooth surface 53b. In addition, when the shape of the tooth surface of a general gear is adopted as the shape of the tooth surface of the tooth 53, as shown in FIG. 6 (b), the second side opposite to the arcuate outer peripheral portion 52 side is used. The curvature of the first tooth surface 53a is equal to the curvature of the second tooth surface 53b on the arcuate outer peripheral portion 52 side, and is between the outer peripheral portion 53c and the first tooth surface 53a located on the outermost peripheral side, and the outer peripheral portion 53c. An inflection part exists between the 2nd tooth surface 53b.

(Fan gear)
As shown in FIGS. 4 and 5B, the sector gear 39 has a shaft portion 61, an output shaft 6a, and a cylindrical portion (large diameter shaft portion) 62 provided between the shaft portion 61 and the output portion. . The shaft portion 61 is located at the end of the other side X2 of the sector gear 39 in the X direction. The bottom plate portion 25 of the case 8 is provided with a cylindrical portion 63 projecting to one side X1 in the X direction (see FIG. 3B), and the shaft portion 61 is inserted into the cylindrical portion 63. As a result, the sector gear 39 can rotate about the axis L2 of the cylinder portion 63 (about the axis L2 of the shaft portion 61). The axis L2 of the cylindrical portion 63 is the rotation center axis L2 of the sector gear 39.

The output shaft 6 a is the output shaft 6 a of the baffle drive mechanism 6. Flat portions 64 that are parallel to both sides of the rotation center axis L2 are provided on the outer peripheral surface of the output shaft 6a. The first shaft portion 21 of the baffle 2 is formed with a recess that fits into the output shaft 6a on the end surface of the other side X2 in the X direction, and the output shaft 6a is rotated by fitting the output shaft 6a into the recess. Transmission to the baffle 2 is possible. The cylindrical portion 62 is coaxial with the shaft portion 61 and the output shaft 6a, and the outer diameter thereof is larger than the outer diameter of the shaft portion 61 and the outer diameter of the output shaft 6a.

Further, the sector gear 39 includes an arc portion 65 having a plurality of teeth along the outer peripheral surface on the outer peripheral side of the cylindrical portion 62. Between the cylindrical part 62 and the circular arc part 65, the connection part 66 which makes these continue is provided.

Of the plurality of teeth arranged in the circumferential direction of the sector gear 39, the first tooth 68 located at the front end in the first rotation direction B1 (rotation direction for opening the baffle) is a toothless gear as shown in FIG. A portion facing the outer peripheral surface 52a of the arcuate outer peripheral portion 52 of 38 is cut out. As a result, as shown in FIGS. 4A and 4C, the first tooth 68 has one side X1 in the X direction on the end surface 52b of the arcuate outer peripheral portion 52 (one in the direction of the rotation center axis L1 on the end surface 52b). Side), it is possible to enter the inner peripheral side of the addendum circle 51a of the toothless gear 38. Further, as shown in FIGS. 4A and 5, the second teeth 69 located next to the first teeth 68 are arranged in the X direction from one side X1 to the other side X2 (in the direction of the rotation center axis L2 of the sector gear 39). From one side to the other side). A tooth end surface 69 a on one side X <b> 1 in the X direction of the second tooth 69 is located on the same plane as the end surface 52 b of the arcuate outer peripheral portion 52.

Here, as shown in FIG. 4, the first teeth 68 of the sector gear 39 enter the inner peripheral side of the tip circle 51a on the other side X2 in the X direction on the end surface 52b of the arcuate outer peripheral portion 52 of the toothless gear 38. Then, the second teeth 69 of the sector gear 39 come into contact with the outer peripheral surface 52a of the arc-shaped outer peripheral portion 52 and the rotation of the sector gear 39 is restricted. That is, the arc-shaped outer peripheral portion 52 of the partial gear 38 and the first teeth 68 and the second teeth 69 of the sector gear 39 constitute a rotation regulating mechanism 70 that regulates the rotation of the sector gear 39 in a specific direction. In this example, when the drive gear 36 rotates in the second rotation direction A2 that closes the baffle 2 and stops at the restriction position where the rotation in the second rotation direction A2 is restricted by the rotation angle range restriction mechanism 47, the fan gear 39 One tooth 68 enters the inner peripheral side of the tip circle 51a on one side X1 in the X direction in the arc-shaped outer peripheral portion 52. As a result, the second teeth 69 of the sector gear 39 abut against the outer peripheral surface 52a of the arc-shaped outer peripheral portion 52, and the sector gear 39 is restricted from rotating in the first rotation direction B1 that opens the baffle 2.

(Opening and closing operation of the opening by the damper device)
FIG. 7 is an explanatory view of the opening / closing operation of the opening 3 by the damper device 1. The left side of FIG. 7A is a partial plan view of the baffle driving mechanism 6 showing the meshing state of the toothless gear 38 and the sector gear 39 when the baffle 2 is in the open position 2A. The figure on the right side is a cross-sectional view of the frame 5 and the baffle 2 when the baffle 2 is in the open position 2A. The left side of FIG. 7B is a partial plan view of the baffle driving mechanism 6 showing the meshing state of the toothless gear 38 and the sector gear 39 when the baffle 2 is in the closed position 2B. The figure on the right side is a cross-sectional view of the frame 5 and the baffle 2 when the baffle 2 is in the closed position 2B.

In the state where the opening 3 is open, the baffle 2 is arranged at the open position 2A as shown in FIGS. 1 (a) and 7 (a). The drive gear 36 is stopped at a restriction position where further rotation in the first rotation direction A1 (rotation direction for opening the baffle 2) is restricted by the rotation angle range restriction mechanism 47. That is, the arc-shaped protrusion 46 of the case 8 is in contact with the other inner peripheral end surface 45b of the arc groove 45 of the drive gear 36 to restrict the rotation of the drive gear 36 in the first rotation direction A1. The tooth portion 51 of the toothless gear 38 is meshed with two teeth 72 located at the end portion on the opposite side to the first tooth 68 in the circumferential direction among the plurality of teeth of the sector gear 39.

When closing the opening 3, the damper device 1 drives the motor 31 in a predetermined rotational direction by a predetermined number of steps. Thereby, the drive gear 36 rotates in the second rotation direction A2. Accordingly, the sector gear 39 rotates in the second rotation direction B2. When the sector gear 39 rotates in the second rotation direction B2, the baffle 2 connected to the output shaft 6a of the sector gear 39 rotates in the closing direction C from the open position 2A toward the closed position 2B.

When the motor 31 is driven by a predetermined number of steps, the drive gear 36 rotates in the second rotation direction A2 (rotation direction for closing the baffle 2) by the rotation angle range restriction mechanism 47 as shown in FIG. 7B. Stops at the restricted position where is restricted. That is, the arc-shaped protrusion 46 of the case 8 abuts against one inner peripheral end surface 45a of the arc groove 45 of the drive gear 36, and restricts further rotation of the drive gear 36 in the second rotation direction A2. In this state, the first teeth 68 of the sector gear 39 enter the inner peripheral side of the addendum circle 51a on one side X1 in the X direction on the end surface 52b of the arc-shaped outer peripheral portion 52 of the missing gear 38. Further, the second teeth 69 of the sector gear 39 abut on the outer peripheral surface 52 a of the arc-shaped outer peripheral portion 52. The baffle 2 is disposed at the closed position 2B, and the elastic member 20 abuts on the seal plate portion 14 of the frame 5 and elastically deforms. Accordingly, the opening 3 is reliably closed by the baffle 2.

The predetermined number of steps for driving the motor 31 is a value obtained by adding a plurality of steps to the specified number of steps for causing the baffle 2 arranged at the open position 2A to reach the closed position 2B. Accordingly, after the baffle 2 is disposed at the closed position 2B, the motor 31 is further driven by a plurality of steps. As a result, the baffle 2 is pressed further in the direction closer to the seal plate portion 14 from the closed position 2B, and the elastic member 20 is further deformed. Therefore, the opening 3 is more reliably closed. Here, if the motor 31 is further driven by a plurality of steps after the baffle 2 is disposed at the closed position 2B, the motor 31 will step out, and the baffle 2 will easily flutter due to the step out. With respect to such a problem, in this example, in the state where the baffle 2 is disposed at the closed position 2B, the second teeth 69 of the sector gear 39 abut on the outer peripheral surface 52a of the arc-shaped outer peripheral portion 52, and the sector gear 39 Is prevented from rotating in the first rotational direction B1 that opens the baffle 2. Therefore, the baffle 2 can be prevented from fluttering due to the step-out generated in the motor 31.

Further, the shape restoring force of the elastic member 20 elastically deformed by the baffle 2 being arranged at the closed position 2B acts as a force for rotating the sector gear 39 in the direction of opening the baffle 2. That is, the shape restoring force of the elastic member 20 acts as a force for rotating the sector gear 39 in the first rotation direction B1. On the other hand, in this example, in a state where the baffle 2 is disposed at the closed position 2B, the second teeth 69 of the sector gear 39 abut against the outer peripheral surface 52a of the arc-shaped outer peripheral portion 52, and the sector gear 39 is Is prevented from rotating in the first rotation direction B1. Therefore, in the damper device 1 of this example, the baffle 2 does not move in the direction of opening the opening 3 from the closed position 2B due to the shape restoring force of the elastic member 20. Furthermore, since the sector gear 39 is prevented from rotating in the second rotation direction for opening the baffle 2, the baffle 2 disposed at the open position 2A is suppressed from fluttering under fluid pressure.

Next, when opening the opening 3, the damper device 1 drives the motor 31 by the specified number of steps in the direction of rotation opposite to when closing the opening 3. The specified number of steps is the number of steps for causing the baffle 2 arranged at the closed position 2B to reach the open position 2A. Thereby, the drive gear 36 rotates in the first rotation direction A1.

When the drive gear 36 starts to rotate, the tooth 53 (the tooth at the front end in the first rotation direction A1) located closest to the arcuate outer peripheral portion 52 in the toothless gear 38 exceeds the second tooth 69 of the sector gear 39. Thus, the first tooth 68 and the second tooth 69 are engaged. Thereby, the sector gear 39 starts to rotate in the first rotation direction B1. When the sector gear 39 rotates in the first rotation direction B1, the baffle 2 connected to the output shaft 6a of the sector gear 39 rotates in the opening direction O from the closed position 2B toward the open position 2A.

Here, due to the force acting on the sector gear 39 from the baffle 2 side, component tolerance, etc., the rotation center axis of the sector gear 39 may be inclined. In such a case, if the second teeth 69 of the sector gear 39 have the same tooth width as the teeth located on the side opposite to the first teeth 68, as shown in FIG. The end 69c on the other side X2 in the X direction of the second tooth 69 in contact with the outer peripheral surface 52a of the 52 is on the other side X2 in the X direction on the end surface 52b of the arcuate outer peripheral portion 52. It may enter the inner circumference side of the circle 51a. In this case, when the tooth 53 located closest to the arcuate outer peripheral portion 52 of the toothless gear 38 is about to exceed the second tooth 69 of the sector gear 39, it interferes with the second tooth 69 and is different. Generate sound.

On the other hand, in this example, as shown in FIG. 4A, the tooth end surface 69a on the one side X1 in the X direction of the second tooth 69 is located on the same plane as the end surface 52b. Therefore, when the rotation center axis L2 of the sector gear 39 is inclined, the second teeth 69 of the sector gear 39 protrude from the end surface 52b of the arcuate outer peripheral portion 52 of the toothless gear 38 to the other side X2 in the X direction. Does not have. Therefore, when the partial gear 38 and the sector gear 39 start meshing, the tooth 53 of the partial gear 38 and the second tooth 69 do not interfere with each other and no abnormal noise is generated.

Further, in this example, when the baffle 2 is disposed at the closed position 2B, the shape return force of the elastic member 20 of the baffle 2 is applied to the sector gear 39 in the rotation restricted state by the sector gear 39 in the first rotation direction B1 ( It acts as a force for rotating the baffle 2 in the rotation direction). Therefore, when the tooth 53 located closest to the arcuate outer peripheral portion 52 of the toothless gear 38 has a general shape as in the reference example shown in FIG. When meshing between the first teeth 68 and the second teeth 69 beyond the second teeth 69 of the sector gear 39, the teeth 53 intermittently collide with the second teeth 69 of the sector gear 39, and the sector gear 39 is Rotates rapidly. And while the sector gear 39 rotates rapidly, the common normal of the tooth 53 of the toothless gear 38 and the second tooth 69 of the sector gear 39 changes its direction abruptly as shown by the dotted line G2 in FIG. become. Therefore, abnormal noise is generated due to the collision between the teeth 53 and the second teeth 69 and the collision between other members constituting the train wheel 32.

On the other hand, in this example, as shown in FIG. 6A, the tooth 53 positioned closest to the arcuate outer peripheral portion 52 of the toothless gear 38 is opposite to the arcuate outer peripheral portion 52 side. The curvature of the first tooth surface 53a is smaller than the curvature of the second tooth surface 53b on the arcuate outer peripheral portion 52 side. Further, the tooth surface of the tooth 53 forms a curved surface in which the outer peripheral portion 53c located on the outermost peripheral side is continuous with the first tooth surface 53a, and is changed only between the outer peripheral portion 53c and the second tooth surface 53b. The music part exists. Thereby, it is the curved surface 53d which continued from the 1st tooth surface 53a side to the 2nd tooth surface 53b. Therefore, when the tooth 53 positioned closest to the arcuate outer peripheral portion 52 of the toothless gear 38 exceeds the second tooth 69 of the sector gear 39, the second tooth 69 has a small curvature with the curved surface 53d of the tooth 53. Continue sliding on the first tooth surface 53a. As a result, as indicated by a solid line G1 in FIG. 8, the common normal of the tooth 53 of the partial gear 38 and the second tooth 69 of the sector gear 39 does not change suddenly. Therefore, it is possible to suppress the generation of abnormal noise due to the collision between the teeth 53 and the second teeth 69 and the collision between other members constituting the train wheel 32.

(Other embodiments)
In the above example, the tooth width of the second tooth 69 of the sector gear 39 is shortened so that the tooth end surface 69a is flush with the end surface 52b of the arcuate outer peripheral portion 52. Further, the tooth end surface 69a may be positioned on the other side X2 in the X direction with respect to the end surface 52b of the arcuate outer peripheral portion 52 (the other side in the direction of the rotation center axis L1 of the toothless gear 38). Even in this case, when the rotation center axis L2 of the sector gear 39 is inclined, the second teeth 69 of the sector gear 39 are on the other side X2 in the X direction with respect to the end surface 52b of the arcuate outer peripheral portion 52 of the partial gear 38. There is no protruding part. Therefore, when the partial gear 38 and the sector gear 39 start meshing, the tooth 53 of the partial gear 38 and the second tooth 69 do not interfere with each other and no abnormal noise is generated.

Further, the tooth width of the second tooth 69 may be made longer than that in the above example, and the tooth end surface 69a may be positioned on one side X1 in the X direction with respect to the end surface 52b of the arcuate outer peripheral portion 52. Even in this case, if the tooth end surface 69a is positioned on the other side X2 in the X direction with respect to the end surface of the tooth portion 51 of the toothless gear 38 (the end surface on the one side X1 in the X direction), the second tooth 69 is present. Since it can suppress entering into the inner peripheral side of the addendum circle 51a on the other side X2 in the X direction from the end face 52b of the arc-shaped outer peripheral portion 52, interference between the sector gear 39 and the partial gear 38 can be suppressed.

Furthermore, the tooth tip portion of the second tooth 69 may be partially cut out from the tooth tip side from the end of one side X1 in the X direction toward the other side X2. Even in this case, the second tooth 69 can be prevented from entering the inner peripheral side of the addendum circle 51a on one side X1 in the X direction with respect to the end surface 52b of the arc-shaped outer peripheral portion 52 of the toothless gear 38. It is possible to suppress interference between the gear 39 and the toothless gear 38.

Fig. 9 shows a sector gear 39 'in which the tooth tip portion of the second tooth 69 is partially cut out from the tooth tip side toward the other side X2 from the end on one side X1 in the X direction. In this example, the second tooth 69 is provided continuously on the tooth body 80 having the same tooth width as the length in the X direction of the arcuate outer peripheral portion 52 of the toothless gear 38 and one side X1 of the tooth body 80. The reinforcing part 81 is provided. The reinforcing portion 81 includes an inclined surface 81a that is inclined from the tooth tip of the tooth body 80 toward one side X1 in the X direction toward the tooth bottom of the second tooth 69 and reaches the tooth bottom. The end on one side X1 in the X direction on the inclined surface 81a is at the same height as the tooth end surface on the one side X1 of the first tooth 68. The contour shape when the inclined surface 81a is viewed from the X direction matches the contour shape when the tooth body 80 is viewed from the X direction. The sector gear 39 ′ of the present example includes a reinforcing portion 81 portion in which the second teeth 69 extend upward from the end surface of the arcuate outer peripheral portion 52 of the toothless gear 38, so that the strength of the second teeth 69 is ensured. it can.

When the baffle 2 is arranged at the open position 2A, the teeth located at the end opposite to the first teeth 68 in the circumferential direction of the sector gear 39 are on the inner peripheral side of the addendum circle 51a of the missing gear 38. You may make it approach and the adjacent tooth | gear may contact | abut to the outer peripheral surface 52a of the circular-arc-shaped outer peripheral part 52. FIG. That is, among the plurality of teeth of the sector gear 39, teeth having a configuration corresponding to the first teeth 68 and the second teeth 69 are provided at the end portion on the opposite side to the first teeth 68 and the second teeth 69 in the circumferential direction. Also good. If it does in this way, when the baffle 2 is arrange | positioned in the open position 2A, it can prevent that the sector gear 39 rotates in the 2nd rotation direction B2 which closes the baffle 2. FIG.

Here, of the plurality of teeth of the sector gear 39, teeth having a configuration corresponding to the first teeth 68 and the second teeth 69 at the other end portion opposite to the first teeth 68 and the second teeth 69 in the circumferential direction. In the case where the first tooth 68 and the second tooth 69 are provided only at one end portion in the circumferential direction of the sector gear 39 as in the sector gear 39 described above, the teeth of the sector gear 39 are provided. The restrictions on the number of sheets increase.

For example, when the baffle 2 is rotated within a predetermined angle range by rotating the sector gear 39 by a predetermined angle range (90 °) as in the damper device 1 of the present example, the baffle 2 is provided on one side in the circumferential direction. The second tooth 69 is the first rotation angle position of the sector gear 39 where the arcuate outer peripheral portion 52 of the toothless gear 38 abuts, and the second tooth 69 provided on the other side in the circumferential direction is the arcuate outer circumference of the toothless gear 38. The sector 52 is in a predetermined angular range between the sector gear 39 and the sector gear 39 with which the portion 52 abuts, and the sector gear 39 is rotated while the sector gear 39 rotates between the first and second rotation angle positions. The number of teeth between the second teeth 69 provided on one side in the circumferential direction and the second teeth 69 provided on the other side and the pitch circle of the sector gear 39 must be set so that the gear 39 and the toothless gear 38 mesh with each other. I must. Accordingly, the degree of freedom in designing the sector gear 39 is reduced. On the other hand, when the first tooth 68 and the second tooth 69 are provided only at one end portion in the circumferential direction of the sector gear 39 as in the above example, the other side in the circumferential direction is Since there is no need to consider the rotational angle position (second rotational angle position) of the sector gear 39 with which the two teeth 69 abut the arcuate outer peripheral portion 52 of the segment gear 38, the degree of freedom in designing the sector gear 39 is high.

Further, in the above example, of the plurality of teeth arranged in the circumferential direction of the sector gear 39, one of the teeth positioned at the front end in the first rotation direction B1 (rotation direction for opening the baffle) is the circle of the missing gear 38. The portion facing the outer peripheral surface 52a of the arc-shaped outer peripheral portion 52 is cut out to form the first teeth 68, but the portion facing the outer peripheral surface 52a of the arc-shaped outer peripheral portion 52 of the toothless gear 38 is cut out for a plurality of teeth. The tooth width may be shortened. In this case, if the tooth located next to the plurality of notched teeth is the second tooth and notched from one side X1 in the X direction, the toothless gear 38 and the sector gear 39 start to mesh. It is possible to prevent the teeth 53 of the toothless gear 38 and the second teeth 69 from interfering with each other to generate abnormal noise.

Here, among the plurality of teeth of the sector gear 39, when a plurality of teeth located at the front portion in the first rotation direction B1 are cut out to form the first teeth 68, the number of the first teeth 68 increases. Accordingly, the sector gear 39 is enlarged in the circumferential direction. In other words, if one of the plurality of teeth is the first tooth 68 as in the sector gear 39 described above, the sector gear 39 can be made compact in the circumferential direction.

(Example 2)
Next, a damper device 1A according to the second embodiment will be described with reference to FIGS. FIG. 10 is an explanatory diagram of the geared motor 10 in the damper device 1A according to the second embodiment. FIG. 10A is a plan view when the geared motor 10 with the lid 7 removed is viewed from one side X1 in the X direction, and FIG. 10B is an exploded perspective view of the geared motor 10. FIG. 11 is a development view of the train wheel 32. In FIG. 11, the train wheel 32 is developed along the line WW in FIG. FIG. 12 is an explanatory diagram of the sector gear 39A in the damper device 1A of the second embodiment. 12A is a perspective view when the sector gear 39A is viewed from one side X1 in the X direction, and FIG. 12B is a view when the sector gear 39A is viewed from the other side X2 in the X direction. FIG. 12C is a cross-sectional view of the sector gear 39A cut along the rotation center axis L2.

The damper device 1A according to the second embodiment includes a configuration corresponding to the damper device 1 according to the first embodiment. Accordingly, the corresponding portions are denoted by the same reference numerals and description thereof is omitted. In the damper device 1A of this example, as shown in FIG. 11, the length dimension N1 of the shaft portion 61 of the sector gear 39A is larger than the length dimension of the shaft portion 61 of the sector gear 39A of the damper device 1 described above. long. Further, in the damper device 1A of this example, the projecting dimension of the cylinder part 63A projecting from the bottom plate part 25 of the case 8 to the one side X1 in the X direction has a length corresponding to the length dimension N1 of the shaft part 61 of the sector gear 39A. It is longer than the protruding dimension of the cylindrical portion 63 of the damper device 1 described above.

(Fan gear)
As shown in FIGS. 10 and 12, the sector gear 39A includes an output shaft 6a and a shaft portion 61, a cylindrical portion (large diameter shaft portion) 62 provided between the output shaft 6a and the shaft portion 61, and a cylindrical portion. The disk part 90 provided between 62 and the output shaft 6a is provided. The shaft part 61, the cylindrical part 62, the disk part 90, and the output shaft 6a are coaxial. As shown in FIG. 12B, an annular surface 91 facing the shaft portion 61 is provided between the shaft portion 61 and the cylindrical portion 62. The annular surface 91 is orthogonal to the rotation center axis L2 of the sector gear 39A. Further, the sector gear 39 </ b> A protrudes from the circular column part 62 to the outer peripheral side to connect the circular column part 62 and the circular arc part 65 to each other with a plurality of teeth meshable with the toothless gear 38 on the outer peripheral surface. A connecting portion 66 is provided.

The output shaft 6 a is the output shaft 6 a of the baffle drive mechanism 6. Flat portions 64 that are parallel to both sides of the rotation center axis L2 are provided on the distal end side of the output shaft 6a. The first shaft portion 21 of the baffle 2 is formed with a recess that fits into the output shaft 6a on the end surface of the other side X2 in the X direction, and the output shaft 6a is rotated by fitting the output shaft 6a into the recess. Transmission to the baffle 2 is possible.

The shaft portion 61 is located at the end of the other side X2 of the sector gear 39A in the X direction. As shown in FIGS. 11 and 12C, the shaft portion 61 has a height dimension N1 in the direction of the rotation center axis L2 longer than the diameter dimension N2 of the shaft portion 61. In this example, the height dimension N1 of the shaft portion 61 is 1.6 to 1.7 times the diameter dimension N2.

Further, the sector gear 39A includes a concave portion 93 that is recessed along the rotation center axis L2 in the center of the tip surface 61a of the shaft portion 61. The concave portion 93 penetrates the shaft portion 61 and the cylindrical portion 62 and reaches the disk portion 90. Here, the sector gear 39A is a resin molded product, and the concave portion 93 is formed by deformation of the shaft portion 61, the cylindrical portion 62, and the disc portion 90 due to sink marks (deformation) generated by resin shrinkage during resin molding. It is meat stealing to prevent.

12B and 12C, the sector gear 39A has a through-hole 94 extending from the outer peripheral surface of the cylindrical portion 62 in a direction orthogonal to the rotation center axis L2 and communicating with the recess 93. Prepare. As shown in FIG. 12C, the recess 93 and the through-hole 94 have an air channel 95 with one end opening in the tip end surface 61 a of the shaft portion 61 and the other end opening in the outer peripheral surface of the cylindrical portion 62. Configure.

Next, as shown in FIGS. 10B and 11, the bottom plate portion 25 of the case 8 is provided with a cylindrical portion 63A that protrudes to one side X1 in the X direction. The bottom plate portion 25 of the case 8 seals the opening on the other side X2 in the X direction of the cylindrical portion 63A. That is, the bottom plate portion 25 includes a blocking portion (blocking portion) 96 that blocks the opening on the other side X2 of the cylindrical portion 63A.

The sector gear 39A is rotatably supported by the cylindrical portion 63A. That is, as shown in FIG. 11, the sector gear 39A has a shaft portion 61 inserted into the cylindrical portion 63A and rotatably fitted therein, and the annular surface 91 is an opening on one side X1 in the X direction of the cylindrical portion 63A. It contacts the edge 97. Therefore, the cylindrical portion 63A has a diameter corresponding to the diameter N2 of the shaft 61, and a height in the X direction is a height that can accommodate the shaft 61. Grease is applied to the annular inner peripheral surface of the cylindrical portion 63A.

In this example, the length dimension N1 of the shaft part 61 supported by the cylinder part 63A is longer than the diameter dimension N2 of the shaft part 61. Therefore, when the sector gear 39A is supported by the cylindrical portion 63A, the sector gear 39A can be prevented or suppressed from being inclined.

Further, the opening on the other side X2 in the X direction of the cylindrical portion 63A is blocked by a blocking portion 96. Accordingly, the rigidity of the cylindrical portion 63A that functions as a bearing for the sector gear 39A is improved. Therefore, even when a force is applied to the sector gear 39A from the direction intersecting the rotation center axis L2, the sector gear 39A can be supported by the cylinder portion 63A without being inclined.

Here, when the shaft portion 61 of the sector gear 39A is inserted into the cylindrical portion 63A provided with the bottom by the blocking portion 96 and is rotatably fitted, a space S (see FIG. 5) defined by the cylindrical portion 63A and the blocking portion 96 is obtained. 10 (b)), the air inside the space S cannot escape from the space S, and in the sector gear 39A, the annular surface 91 between the shaft portion 61 and the cylindrical portion 62 is lifted from the opening edge 97 of the cylindrical portion 63A. It may become in a state of being. On the other hand, the sector gear 39A of this example is provided with an air flow path 95. This air flow path 95 is connected to the cylindrical portion 63A when the shaft portion 61 of the sector gear 39A is inserted into the cylindrical portion 63A. The space S defined by the blocking portion 96 is communicated with the outside. Accordingly, when the shaft portion 61 of the sector gear 39A is inserted into the cylinder portion 63A, the air in the space S defined by the cylinder portion 63A and the blocking portion 96 escapes through the air flow path 95. Therefore, the sector gear 39A is reliably supported by the cylindrical portion 63A.

Further, if the length dimension N1 of the shaft portion 61 supported by the cylinder portion 63A is increased, it becomes easy to prevent the sector gear 39A from being inclined. However, when the length dimension N1 of the shaft portion 61 is increased, when the force is applied to the sector gear 39A from the direction intersecting the rotation center axis L2, the shaft portion 61 supported by the cylinder portion 63A. There is a possibility that stress concentrates on the tip of the shaft and the shaft portion 61 is damaged. On the other hand, in this example, the height dimension N1 of the shaft part 61 is set to be twice or less the diameter dimension N2 of the shaft part 61. Therefore, such a situation can be avoided.

As shown in FIG. 11, the lid 7 is provided with a circular opening 98 that exposes the output shaft 6a of the sector gear 39A to the outside. The edge of the opening 98 in the lid 7 functions as a bearing that rotatably supports the disk 90 of the sector gear 39A.

1.1A ... Damper device 2 ... Baffle 2B ... Baffle closed position 3 ... Opening portion 5 ... Frame 8 ... Case 20 ... Elastic member 31 ... Motor 32 ..Wheel train 38 ... Missing gear 38
39 · 39A ·· Sector gear 51 ··· tooth portion 51a · tooth tip circle 52 · · · arc-shaped outer peripheral portion (outer peripheral portion)
52a ... outer peripheral surface 52b of the outer peripheral portion ... end face 53 of the outer peripheral portion ... teeth 53a on the outermost peripheral side of the tooth portion ... first tooth surface 53b ... second tooth surface 53d ... Curved surface 61... Shaft portion 62... Cylindrical portion (large diameter shaft portion)
63 · 63A · · · cylindrical portion 65 · · · arc portion 66 · · · connection portion 68 · · · first tooth 69 · · · second tooth 69a · · · tooth end surface 93 · · · recess 94 · · · through Hole 95 ... Air flow path 96 ... Sealing part (blocking part) of bottom plate part
97... Opening edge L1 of the cylindrical portion... Rotation center rotation center axis L2 of the toothless gear 38 (rotation center axis L2)
X ... direction along the rotation center rotation center axis L2 of the partial gear 38 (rotation center axis L2 direction)
X1... One side X1 in the direction along the rotation center rotation center axis L2 of the toothless gear 38 (one side X1 in the direction of the rotation center axis L2)
N1: Height dimension of the shaft portion in the rotation center axis direction N2: Diameter dimension of the shaft portion

Claims (11)

A baffle to open and close the opening,
A motor,
A train wheel that transmits rotation of the motor to the baffle;
The train wheel includes a partial gear, and a sector gear that meshes with the partial gear and follows the partial gear,
The toothless gear includes an outer peripheral portion provided with an outer peripheral surface of an arc along a tip circle of the tooth portion at a position adjacent to the tooth portion in the circumferential direction,
The outer peripheral portion has an end face that is shorter than the tooth width of the tooth portion in the axial direction and faces one side in the axial direction at a position in the middle of the tooth portion in the axial direction.
In the sector gear, a portion facing the outer peripheral surface is notched, and a first tooth that can enter the inner peripheral side of the tip circle on one side in the axial direction on the end surface, and the first tooth A second tooth that is located next to and can abut on the outer peripheral surface when the first tooth enters the inner peripheral side of the tip circle,
The damper device according to claim 1, wherein the second tooth is cut out from a tooth tip side toward the other side from one end in the axial direction. In claim 1,
The damper device according to claim 1, wherein a tooth end surface on one side in the axial direction of the second tooth is located on the same plane as the end surface or on the other side in the axial direction from the end surface. In claim 1 or 2,
The damper device according to claim 1, wherein the tooth on the most outer peripheral side of the tooth portion has a curvature of the first tooth surface opposite to the outer peripheral portion that is smaller than a curvature of the second tooth surface on the outer peripheral side. In claim 3,
The damper device according to claim 1, wherein a tooth surface of the tooth portion closest to the outer peripheral portion of the tooth portion is a curved surface continuous from the first tooth surface side to the second tooth surface. In any one of claims 1 to 4,
When the baffle is disposed at a closed position for closing the opening, the first tooth enters the inner peripheral side of the tip circle on one side of the end surface of the outer peripheral portion in the axial direction, and the second tooth A damper device characterized in that teeth are brought into contact with the outer peripheral surface and the sector gear is prevented from rotating in a direction to open the baffle. In claim 5,
Having a frame with the opening;
The baffle includes an elastic member capable of sealing the opening,
The damper device is characterized in that the elastic member elastically deforms by contacting an opening edge of the opening in the frame when the baffle is disposed at the closed position. In any one of claims 1 to 6,
The damper device according to claim 1, wherein the sector gear is an output gear coupled to the baffle. In any one of claims 1 to 7,
The damper device according to claim 1, wherein the first tooth is one of a plurality of teeth meshing with the partial gear. In any one of claims 1 to 8,
A case for housing the motor;
The case includes a cylindrical portion that rotatably supports the sector gear,
The sector gear includes a shaft portion, a large-diameter shaft portion having a diameter larger than that of the shaft portion and extending coaxially with the shaft portion, and an annular surface facing the shaft portion side between the shaft portion and the large-diameter shaft portion. An arc portion having a plurality of teeth meshable with the toothless gear on an outer peripheral surface, and a connecting portion that protrudes from the large diameter shaft portion to the outer peripheral side and connects the large diameter shaft portion and the arc portion. Prepared,
The plurality of teeth includes the first tooth and the second tooth,
The shaft portion has a longer height dimension in the axial direction of the shaft portion than the diameter dimension of the shaft portion,
The damper device according to claim 1, wherein the shaft portion is inserted into the tube portion so as to be rotatable, and the annular surface is in contact with an opening edge of the tube portion. In claim 9,
The damper device according to claim 1, wherein a height dimension of the shaft portion is not more than twice a diameter size of the shaft portion. In claim 9 or 10,
The case includes a blocking portion that blocks the opening on the side opposite to the side where the shaft portion is inserted in the cylindrical portion,
The fan-shaped gear is provided with an air flow path having one end opened at a tip end surface of the shaft portion and the other end opened at an outer peripheral surface of the large-diameter shaft portion.

Images