WO2008072728A1 - Seat device for vehicle - Google Patents

Abstract

A seat device for a vehicle, which, even if the relative positions between a seat cushion frame and a seatback frame are changed, the length of a seat cushion spring is maintained constant to provide good seat performance to the person seated. A rear holding pipe (134) to which the rear end of the seat cushion spring (140) is connected and a front holding pipe (136) to which the front end is connected are connected together via a projection (132) and a link (144). The center of rotation of the seat cushion (106) when it is reclined and the rear holding pipe (134) are set to different positions. The distance between the rear holding frame (134) and the front holding pipe (136) is maintained by the link (144) when the rear holding frame (134) is moved by reclining of a seatback frame (110), so that the length of the seat cushion spring (140) is also maintained constant.

Description

 Specification

 Vehicle seat device

 Technical field

 [0001] The present invention relates to a vehicle seat device.

 Background art

 [0002] For a seat (vehicle seat) provided in a vehicle, for example, as disclosed in Patent Document 1, the seat back is divided into a lower part and a lower part of the seat back, and the reclining angle of the lower part of the seat back is set. In response to this, there are some that can take a comfortable driving posture by moving the seat cushion back and forth.

 [0003] In general, a seat cushion spring is disposed in a seat cushion of a vehicle seat device. However, if the front end of the seat cushion spring is attached to the seat cushion frame and the rear end is attached to the seat back frame, the relative position between the seat cushion frame and the seat back frame will be increased by the movement of the seat cushion as described above. When this happens, the distance between the front and rear mounting parts of the seat cushion spring will also change. For this reason, the length of the seat cushion spring is also changed, and the elastic force for the seated person is also changed, so that the seating property is lowered.

 Patent Document 1: JP 2005-52433 A

 Disclosure of the invention

 Problems to be solved by the invention

[0004] In consideration of the above facts, the present invention can maintain the seat cushion spring length by maintaining the seat cushion spring length even when the relative position of the seat cushion frame and the seat back frame changes. It is an object to obtain a vehicle seat device.

 Means for solving the problem

[0005] In the invention according to claim 1, the seat tack frame constituting the seat cushion of the vehicle seat, the seat back of the vehicle seat, and rotating with respect to the seat cushion frame can be reclining. Seat back frame and the seat A first attachment member to which a rear end of the seat cushion spring is attached, a second attachment member provided on the seat cushion frame to which a front end of the seat cushion spring is attached, the first attachment member and the second attachment And an interval maintaining means for maintaining the interval with the member.

 In the present invention, the rear end force S of the seat cushion spring is attached to the first attachment member provided on the seat back frame, and the front end is attached to the second attachment member provided on the seat cushion frame. . Here, even if the seat back frame rotates with respect to the seat cushion frame and the relative positions thereof change, the interval between the first attachment member and the second attachment member is maintained by the interval maintaining means. For this reason, the length of the rear end and front end of the seat cushion spring is also maintained. Since the elastic force for the seated person does not change, the seating property can be maintained well.

 [0007] In the invention according to claim 2, in the invention according to claim 1, the rear end force of the seat cushion spring is attached to the first attachment member at a position different from the rotational center of the seat back frame. It is characterized by.

 [0008] Thus, by attaching the rear end of the seat cushion spring to the first mounting member at a position different from the center of rotation of the seat back frame, the degree of freedom of the arrangement of the seat cushion spring, the seat back frame Increase design freedom.

 [0009] In this configuration, if the front end of the seat cushion spring is fixed to, for example, the seat cushion frame, the rear end of the seat cushion spring moves as the seat cushion spring rotates, so the seat cushion spring The length of the rear and front ends of the spring will also change. However, in the present invention, since the distance between the first attachment member and the second attachment member is maintained by the interval maintaining means, the lengths of the rear end and the front end of the seat cushion spring are also maintained.

 [0010] In the invention according to claim 3, in the invention according to claim 1 or 2, the second attachment member is movable in the front-rear direction with respect to the seat cushion frame. The front end of the seat cushion spring is attached to the member.

That is, the second mounting member moves in the front-rear direction with respect to the seat cushion frame. Therefore, it becomes possible to maintain a space | interval with a 1st attachment member by a space | interval maintenance means. Since the front end of the seat cushion spring is attached to the second attachment member, the lengths of the rear end and the front end of the seat cushion spring are also maintained.

 [0012] In the invention according to claim 4, in the invention according to any one of claims 1 to 3, the distance maintaining means includes the first attachment member, the second attachment member, It has the connection member which connects.

 [0013] Thus, with a simple structure having a connecting member, the interval maintaining means can be configured to maintain the interval between the first attachment member and the second attachment member.

 [0014] In the invention according to claim 5, in the invention according to any one of claims 1 to 4, the seat back frame is centered on a rotation center point of the seat back frame. A curved plate that curves downward with a certain curvature and presses the rear end portion of the seat cushion spring from above is provided.

 [0015] Accordingly, the rear end portion of the seat cushion spring is pushed by the curved plate, and is bent about the rotation center point of the seat back frame. Thereby, the rear end portion of the seat cushion spring is smoothly connected to the seat back frame, so that the seating feeling of the seated person can be improved.

 [0016] In the invention according to claim 6, in the invention according to claim 5, the front end force S of the contact portion between the curved plate and the seat cushion spring is closer to the seat back frame than the front end of the curved plate. It is located.

 [0017] Therefore, the seat cushion spring is linear as a tangent to the contact portion with the curved plate in front of the front end of the contact portion with the curved plate (hereinafter referred to as "separation point"). On the rear side, it bends with a predetermined curvature along the curved plate. At the separation point, the straight portion and the curved portion of the seat tack spring smoothly continue without any step, so that the seating feeling of the seated person can be improved.

[0018] When the seat back frame is tilted forward, the seat cushion spring is pushed by the curved plate, and is bent in an arc shape centering on the rotation center of the seat back frame. When the seat back frame is tilted backward, the curved plate is separated from the seat cushion spring, so that the seat cushion spring is linear. In either case, the seat cushion spring and shim It is possible to reduce the level difference from the one back frame.

[0019] In the invention according to claim 7, in the invention according to any one of claims 1 to 6, the cushion pad mounted on the seat cushion frame and the seat pad frame are mounted. And a middle pad that is disposed between the cushion pad and the back pad and expands and contracts according to a change in the position of the cushion pad and the back pad.

[0020] Therefore, when the distance between the cushion pad and the back pad changes due to reclining of the seat back or the like, the intermediate pad expands and contracts to absorb this change, so there is no gap between the cushion pad and the back pad. . The invention's effect

 [0021] Since the present invention is configured as described above, even when the relative position of the seat cushion frame and the seat back frame is changed, the seat cushion spring length is maintained and the seating ability for the seated person is maintained well. it can.

 Brief Description of Drawings

 FIG. 1 is a schematic perspective view showing an internal structure of a vehicle seat device according to a first embodiment of the present invention in a normal state.

 FIG. 2 is a schematic perspective view showing an external shape of the vehicle seat device of the first embodiment of the present invention in a normal state.

 FIG. 3 is a schematic perspective view showing the internal structure of the vehicle seat device according to the first embodiment of the present invention in a reclining state.

 FIG. 4 is a schematic perspective view showing the appearance of the vehicle seat device according to the first embodiment of the present invention in a reclining state.

 FIG. 5 is a partially broken side view showing the internal structure of the vehicle seat device of the first embodiment of the present invention in a normal state.

 FIG. 6 is a partially broken side view showing the internal structure of the vehicle seat device of the first embodiment of the present invention in a reclining state.

FIG. 7 is a partially broken side view showing the vehicle seat device of the first embodiment of the present invention in an enlarged manner in the vicinity of an arc portion. FIG. 8 is an explanatory view showing a relationship between a seat back and a rotation center thereof in the vehicle seat device according to the first embodiment of the present invention.

 BEST MODE FOR CARRYING OUT THE INVENTION

 1 and 3 schematically show an internal structure of the vehicle seat device 102 according to the first embodiment of the present invention. 2 and 4 schematically show the appearance of the vehicle seat device 102. FIG. In the drawing, the vehicle front is indicated by an arrow FR, the vehicle width direction is indicated by an arrow W, and the upper direction is indicated by an arrow UP. Some vehicle seat devices can rotate around the center of rotation in the vertical direction, and the force that may cause the front of the vehicle and the front of the vehicle seat device to become inconsistent due to the rotation. Device 102 will be described as being installed facing the front of the vehicle!

 As shown in FIGS. 2 and 4, the vehicle seat apparatus 102 includes a seat cushion 104 and a seat back 106. As will be described in detail later, the seat back 106 is located with respect to the seat cushion 104. It is a structure to recline. 3 and 4 show a state in which the reclining angle is increased by tilting (backward tilting) the seat back 106 from the state of FIGS. 1 and 2.

 [0025] A seat cushion frame 108 force is provided in the seat cushion 104, and a seat back frame 110 is provided in the seat back 106 so that the shape can be maintained.

[0026] The seat cushion frame 108 has a pair of seat cushion side frames 112 arranged in parallel with a certain interval in the vehicle width direction. On the other hand, the seat back frame 110 is formed in a substantially inverted U shape, and has a seat back top frame 114 disposed substantially horizontally at the upper end, and a seat tack frame from both ends of the seat back top frame 114. And a pair of parallel seat back side frames 116 extending toward the rear of 108. The seat back side frame 116 is curved at a predetermined position in accordance with the shape of the upper body of the seated person.

Furthermore, an arc portion 118 is formed in the lower portion of the seat back frame 110. The arc portion 118 is formed in an arc shape centered on an assumed rotation center point DPI assumed in advance for the vehicle seat device 102. Hereinafter, this assumed rotation center point DPI will be described. [0028] As shown in detail in FIG. 8, when the seat back 106 tilts backward due to reclining, consider the pivot center point of the upper body of the seated person SP. At this time, the rotation center point is at a different position depending on the body shape and posture of the seated person. Here, in this embodiment, the assumed rotation center point DPI is set by taking the average of a plurality of seated persons. Accordingly, the assumed rotation center point DP 1 can be the average of the hip point of the seated person and the position of the sciatic tubercle. In particular, in this embodiment, the average position of the seated person's hip points is set as the assumed rotation center point DPI. As shown in FIGS. 5 to 7, the arc portion 118 is formed so as to have an arc shape around the assumed rotation center point DPI set in this way.

 In addition, as shown in detail in FIGS. 1, 3 and 7, an arc-shaped elongated hole 120 centered on the assumed rotation center point DPI is formed at the rear part of each seat cushion frame 108. Is formed. On the other hand, each of the seat back frames 110 is provided with two pins 122 per one seat back frame 110 that are accommodated in the long holes 120 at regular intervals. Therefore, when the pin 122 relatively moves (slids) in the long hole 120, the arc portion 118 rotates around the assumed rotation center point DPI. As the arc portion 118 rotates, the seat back frame 110 also moves between the normal posture shown in FIGS. 1 and 5 and the reclining posture shown in FIGS. 3 and 6. The position of the pin 122 is determined in relation to the long hole 120 so that the seat cushion frame 108 can move between the normal position and the reclining position.

 [0030] Each of the arc portions 118 of the seat cushion frame 108 is attached with a seat back frame side gear 124 in which external teeth centered on the assumed rotation center point DPI are formed. In addition, a seat cushion frame side gear 126 is rotatably attached to each of the seat cushion side frames 112, and teeth thereof mesh with external teeth of the seat back frame side gear 124. Each of the seat cushion frame side gears 126 is connected by a driving force transmission rod 128 extending in the vehicle width direction so as to rotate integrally.

Further, as shown in FIGS. 1 and 3, a motor 130 for rotating and driving the seat back frame side gear 124 is attached to one of the seat cushion side frames 112. Therefore, when the motor 130 is rotated, the two seat cushion frame side gears 126 are removed. The seat back frame side gear 124, which rotates in the same manner and meshes with the seat cushion frame side gear 126, also rotates around the assumed pivot center point DPI. Thus, the arc portion 118 can be rotated around the assumed rotation center point DPI using the rotational driving force of the motor 130.

 As shown in FIGS. 5 to 7, a projecting portion 132 projects downward from the arc portion 118 of the seat back frame 110, and a boundary portion between the arc portion 118 and the projecting portion 132 (lower side) The rear holding pipe 134 is stretched between the pins 122 in the vicinity of the side pins 122). As shown in FIGS. 1 and 3, the rear holding pipe 134 is disposed in the seat cushion 104 and supports the cushion pad 148 (see FIGS. 2 and 4) of the seat cushion 104 from the inside. The rear end of seat cushion spring 140 is attached. As described above, the rear holding pipe 134 is provided and the rear end of the seat cushion spring 140 is attached. For example, the seat back frame 110 is provided with a shaft serving as a rotation center when the seat back 106 is reclining. (The position of the shaft is fixed) Compared with the configuration in which the rear end of the seat cushion spring 140 is attached to this shaft, the degree of freedom of arrangement of the seat cushion spring 140 is increased.

 In contrast, pipe sliding slits 138 are formed in the vicinity of the front ends of the seat cushion side frames 112 along the front-rear direction, and the ends of the front holding pipe 136 are formed in the two pipe sliding slits 138. Each part is housed. The front holding pipe 136 slides in the pipe sliding slit 138 and can move in the front-rear direction. The front end of the seat cushion spring 140 is attached to the front holding pipe 136.

The vicinity of the projecting end of the projecting portion 132 and the front holding pipe 136 are connected by a link 144 so that the distance between them is always maintained constant. Therefore, the rear holding pipe 134 and the front holding pipe 136 are connected by the protrusion 132 and the link 144 so that the distance between them is constant. For example, if the inclination angle of the seat cushion frame 108 changes due to forward or backward inclination, the position of the rear holding pipe 134 also changes, but the front holding pipe 136 also slides back and forth in response to this, and the rear holding pipe 134 The distance between the pipe 134 and the front holding pipe 136 is always kept constant. As shown in FIGS. 5 and 6, seat cushion spring pressing plates 146 are attached to the arc portions 118 of the respective seat cushion frames 108. The seat cushion spring pressing plate 146 has a pressing piece 146P formed in an arc shape centered on the assumed rotation center point DPI. As shown in FIG. 5, the position of the pressing piece 146P is such that the boundary point between the contact portion of the seat cushion spring 140 and the pressing piece 146P and the separation portion (hereinafter referred to as the separation point PP) is more than the front end of the pressing piece 146P. The seat back frame 110 side, that is, the rear side of the front end of the pressing piece 146P is located.

 [0036] In the normal state of the seat back frame 110, the separation point PP moves relatively forward and presses the rear portion of the seat cushion spring 140 so as to be curled in an arc shape. On the other hand, as shown in FIG. 6, in the rearward tilt state of the seat back frame 110, the separation point PP moves relatively rearward, and the front portion of the pressing piece 146P is gradually separated from the seat cushion spring 140. It is set to continue. The separation point between the pressing piece 146P and the seat cushion spring 140 The seat cushion spring 140 is linear as a tangent to the contact part with the pressing piece 146P on the front side of the PP, and the assumed rotation center point DP 1 is set on the rear side. It is curved in a circular arc shape as the center. The seat cushion spring 140 has a smooth portion at the separation point PP that is straight at the front side of the separation point PP and a portion curved in an arc shape at the rear side of the separation point PP. That is, it is continuous without sudden bending.

 [0037] As shown in Figs. 2 and 4, a cushion pad 148 and a back pad 150 are mounted and fixed to the seat cushion frame 108 and the seat back frame 110, respectively. Further, an intermediate pad 152 is disposed between the cushion pad 148 and the back pad 150 and is fixed to the cushion pad 148. The intermediate pad 152 is formed so that it can be extended and contracted. When the distance between the cushion pad 148 and the back pad 150 changes, this change is absorbed and no gap is generated between the cushion pad 148 and the back pad 150. It has become.

[0038] In the vehicle seat device 102 of the present embodiment configured as described above, when driving an automobile or the like, as shown in Figs. The frame 110) is in a normal state with a small inclination angle. When the motor 130 is driven to rotate from this state, the seat cushion frame side gear 126 rotates as shown in FIGS. 3, 4, and 6. The seat back frame side gear 124 that is turned and rotated also rotates, so that the arc portion 118 rotates around the assumed rotation center point DPI, and the seat back frame 110 also tilts backward. That is, by rotating the motor 130, the inclination angle of the seat back 106 can be increased and the reclining state can be achieved.

 At this time, as can be seen from the above description, in the present embodiment, the seat back 106 tilts backward while rotating about the assumed rotation center point DPI. In other words, the seat back 106 moves backward with reference to the rotation center of the behavior of the upper body of the seated person when taking the reclining posture, in other words, the center of rotation of the upper body of the seated person. Since the vehicle is tilted, the seat back 106 follows the movement of the upper body of the seated person during reclining. Therefore, the relative displacement between the seated person and the seat back 106 due to the increase in the inclination angle of the seat back 106 decreases, and for example, a so-called folding occurs between the seated person's back and the seat back 106. And the clothes of the seated person are not accidentally pulled by friction with the seat back 106. The seated person can take a comfortable sitting posture even when the inclination angle of the seat back 106 increases.

 [0040] Further, since the back pad 150 does not need to be considered to be misaligned with the upper body of the seated person, the back pad 150 can have a shape that is more suitable for the upper body of the seated person. Can be improved.

 [0041] When the inclination angle of the seat back 106 changes, the position of the rear holding pipe 134 also changes. Here, in the present embodiment, as shown in FIGS. 5 and 6, the vicinity of the protruding end of the protruding portion 132 and the front holding pipe 136 are connected by the link 144. Therefore, the front holding pipe 136 is also moved back and forth. By sliding, the distance between the rear holding pipe 134 and the front holding pipe 136 is always kept constant. Therefore, the length of the seat cushion spring 140 attached to each of the rear holding pipe 134 and the front holding pipe 136 can be maintained constant. As a result, the tension applied to the cushion pad 148 is also kept constant.

In the present embodiment, as shown in FIGS. 5 and 6, when the seat back 106 is in the normal state or when it is tilted forward, the pressing piece 146P of the seat cushion spring pressing plate 146 is the seat cushion spring. The rear part of 140 is pressed and curved in an arc. And seat bar As the back frame 110 is tilted backward, the front end (separation point PP) of the contact portion of the seat cushion spring 144 with the pressing piece 146P relatively gradually moves backward, and the front portion of the pressing piece 146P is seat cushion spring. Separate from 140. For this reason, the seat cushion spring 140 is smoothly continuous with the arc portion 118 at the separation point PP without being bent smoothly. As a result, in the present embodiment, the seat cushion spring 140 is continuous both when the seat back 106 is tilted forward and backward, so that the cushion pad 148 can be maintained in a desired shape.

 [0043] In the above description, the structure having the link 144 is given as the distance maintaining means of the present invention. However, if the distance between the rear holding pipe 134 and the front holding pipe 136 can be maintained, the distance maintaining means The configuration is not limited to this. For example, a moving means (for example, a motor) for moving the front holding pipe 136 in the front-rear direction of the vehicle is provided. A configuration may be adopted in which the distance between the rear holding pipe 134 and the front holding pipe 136 is maintained by being moved. When the link 144 is used as in the above embodiment, the interval can be reliably maintained with a simple configuration.

 [0044] Further, the application object of the present invention is not limited to the first attachment member (member to which the rear end of the seat cushion spring 140 is attached) 1S rear holding pipe 136 as described above. In short, the first mounting member and the first cushioning member are applied when the first mounting member moves with a change in the relative position of the seatback and the seat cushion (reclining of the seatback is one example). The distance between the two attachment members (the member to which the front end of the seat cushion spring 140 is attached) can be maintained.

 Explanation of symbols

[0045] 102 vehicle seat device

 104 seat cushion

 106 seat back

 108 seat cushion frame

 110 seat back frame

 112 seat cushion side frame

114 seat back top frame 116 seat backside frame

118 arc part

120 long holes

122 pin

 124 seat back frame side gear

126 Seat cushion frame side gear

128 driving force transmission rod

130 motor

132 protrusion

 134 Rear holding pipe (first mounting member)

136 Front holding pipe (second mounting member)

138 pipe sliding slit

144 links (connecting member, spacing maintenance means)

146 Seat cushion spring pressing plate (curved plate)

146P pressing piece

150 knots

152 intermediate pad

Claims

The scope of the claims  [1] a seat cushion frame constituting a seat cushion of a vehicle seat;  A seat back frame which constitutes a seat back of a vehicle seat and which can be reclined by rotating with respect to a seat cushion frame;  A seat cushion spring disposed in the seat cushion;  A first mounting member provided on the seat back frame to which a rear end of the seat cushion spring is attached;  A second mounting member provided on the seat cushion frame and to which a front end of the seat cushion spring is attached;  A vehicle seat device, comprising: a distance maintaining means for maintaining a distance between the first mounting member and the second mounting member.  [2] The rear end force of the seat cushion spring is attached to the first mounting member at a position different from the rotational center of the seat back frame. Sheet device.  3. The second mounting member is configured to be movable in the front-rear direction with respect to the seat cushion frame, and a front end of a seat cushion spring is attached to the second mounting member. Item 3. The vehicle seat device according to Item 2.  [4] The vehicle according to any one of claims 1 to 3, wherein the gap maintaining means includes a connecting member that connects the first mounting member and the second mounting member. Sheet device.  [5] A curved plate that bends with a certain curvature downward from the pivot point of the seat back frame and presses the rear end portion of the seat cushion spring from above.  The vehicle seat device according to any one of claims 1 to 4, wherein the vehicle seat device is provided. 6. The vehicle seat device according to claim 5, wherein the front end force of the contact portion between the curved plate and the seat cushion spring is located closer to the seat back frame than the front end of the curved plate. . [7] a cushion pad attached to the seat cushion frame;  A back pad attached to the seat back frame;  An intermediate pad that is disposed between the cushion pad and the back pad and expands and contracts according to a change in position of the cushion pad and the back pad;  The vehicular gear device according to any one of claims 1 to 6, characterized by comprising: