WO2005061925A1 - Tensioner - Google Patents

Abstract

A structure behaving stably even if the structure receives an input of high speed from an engine. A first shaft (3) and a second shaft (4), fixed through screw sections (8, 9), and a torsion spring (5) for rotationally urging the first shaft member (3) into one direction are received in a case (2), restraining the rotation of the second shaft member (4) to convert the rotational urging force of the torsion spring (5) into a propulsion force of the second shaft member (4). An elastic member (20) for axially urging the first shaft member (3) is provided, the elastic member (20) urging the first shaft member (3) such that a shaft end (3f) of the first shaft member (3) is in close contact with the case (2). Supporting members (25, 27) supporting the first shaft member (3) at at least two positions in the axial direction are arranged in the case (2).

Description

 Specification

 Tensioner

 Technical field

 The present invention relates to a tensioner that keeps the tension of an endless belt or chain constant.

 Background art

 [0002] A tensioner, for example, pushes a timing chain used in an automobile engine or a timing belt with a predetermined force, and acts to keep the tension constant when these elongate or loosen. .

 FIG. 12 shows a state where the tensioner 100 is mounted on an engine body 200 of an automobile. A pair of cam sprockets 210, 210 and a crank sprocket 220 are arranged inside the engine body 200, and a timing chain 230 is hung endlessly between these sprockets 210, 210, 220. Has been passed. In addition, a chain guide 240 is arranged on the movement path of the timing chain 230 so as to be swingable, and the timing chain 230 slides on the chain guide 240. The engine body 200 has a mounting surface 250 formed thereon, and the tensioner 100 is fixed to the mounting surface 250 by bolts 270 penetrating through mounting holes 260 in the mounting surface 250. The engine body 200 is filled with lubricating oil (not shown)! RU

 FIG. 13 shows a commonly used tensioner 100, in which a rotating shaft 120 and a propulsion shaft 130 are assembled and arranged inside a case 110. The case 110 has a main body 111 extending in the axial direction for inserting the shafts 120 and 130, and a flange 112 extending from the main body 111 in a direction intersecting the axial direction. The flange portion 112 is for mounting the tensioner 100 to the engine body 200.Therefore, the flange portion 112 is provided with a mounting hole 113 for a bolt to be screwed into the engine body 200 to pass therethrough. RU The main body 111 accommodates each component to be described later. For this reason, a housing hole 114 having the same diameter is formed inside the main body 111 along the axial direction.

[0005] When assembling the rotating shaft 120 and the propulsion shaft 130, the male screw portion 121 is formed on the outer surface of the rotary shaft 120, while the female screw portion 131 is formed on the inner surface of the propulsion shaft 130. It is performed by screwing these screw portions 121, 131. A receiving seat 140 is provided in the case 110 corresponding to an end on the base end side of the rotating shaft 120 so as to be located in the storage hole 114. Part is supported. In the assembled state, the propulsion shaft 130 is screwed into a substantially half portion on the front side of the rotary shaft 120, and the propulsion shaft 130 is screwed into the screw shaft 150. ing.

 [0006] The torsion spring 150 has a hook portion 151 at one end formed at the base end portion of the rotating shaft 120, which is inserted into the slit 123 and locked, and the hook portion 152 at the other end is locked to the case 110. ing. Accordingly, if the torsion spring 150 is twisted to assemble with a predetermined torque applied, the rotating shaft 120 is rotated by the urging force of the torsion spring 150.

 [0007] A bearing 160 is fixed to a distal end portion of the case 110 by a retaining ring 170, and the propulsion shaft 130 passes through a sliding hole 161 of the bearing 160. The inner surface of the sliding hole 161 of the bearing 160 and the outer surface of the propulsion shaft 130 are formed in a substantially oval shape, a parallel cut, or another non-circular shape, so that the rotation of the propulsion shaft 130 is restricted. ing.

 [0008] The bearing 160 is formed in a flat plate shape having a predetermined thickness, and a plurality of fixing pieces 162 are formed on the outer peripheral side. By fitting the fixing piece 162 into the notch groove 115 formed at the tip of the case 110, the entire bearing 160 is in a state where rotation is stopped. Since the bearing 160 is stopped from rotating with respect to the case 110, the propulsion shaft 130 penetrating the bearing 160 is rotationally restrained by the case 110 via the bearing 160. Move forward / backward for case 110.

 [0009] A cap 180 is attached to the tip of the propulsion shaft 130, and the cap 180 is in contact with the chain guide 240 in the engine body 200 described above.

 [0010] Further, a spacer 190 is arranged inside the case 110. The spacer 190 has a cylindrical shape extending in the axial direction (propulsion direction) in a state surrounding the rotation shaft 120 and the propulsion shaft 130. It is prevented from getting out of. In order to prevent this, the rotating shaft 120 is formed in a flanged shape that can abut against the spacer 190.

In the tensioner 100 having the above structure, the rotating shaft 1 is driven by the urging force of the torsion spring 150. 20 rotates, and this rotational force is converted to the propulsive force of the propulsion shaft 130, so that the propulsion shaft 130 advances. Accordingly, the propulsion shaft 130 presses the timing chain 230 via the cap 180 and the chain guide 240, so that tension can be applied to the timing chain 230.

 However, the tensioner 100 shown in FIG. 13 cannot respond to the input load when a large external load is input from the timing chain, and the propulsion shaft 130 is likely to be pushed in. Become a thing! /

 [0013] Japanese Patent Laying-Open No. 2003-184968 discloses a conventional tensioner that can flexibly cope with such an input load. This tensioner has a basic structure shown in FIG. 13 and further incorporates a coil spring into the structure shown in FIG. The coil spring is disposed between the rotating shaft 120 and the propulsion shaft 130. By arranging the coil spring in this way, the coil spring generates a resistance torque against the input external load, so it can cope well with the external input load where the propulsion shaft is not pushed. It is possible to do so.

 Patent Document 1: Japanese Patent Application Laid-Open No. 2003-184968

 [0014] Also in the tensioner disclosed in Japanese Patent Application Laid-Open No. 2003-184968, when the engine rotates at high speed and high vibration is input or when lateral vibration occurs, the propulsion shaft vibrates violently in a vertical direction. It has a problem that it may fall down or lift up, and stable behavior cannot be secured. Here, high vibration refers to vibration that includes both high load vibration and high frequency vibration.

 [0015] An object of the present invention is to provide a tensioner capable of performing stable behavior even with such high vibration and lateral vibration.

 Disclosure of the invention

[0016] In order to achieve the above object, the tensioner according to the first aspect of the present invention provides a first shaft member and a second shaft member screwed by a screw portion, and the first shaft member is rotated in one direction. A tensioner for accommodating a torsion spring that is biased in a case, restricts rotation of the second shaft member, and converts the rotational urging force of the torsion spring into a propulsion force of the second shaft member. Rotate the first shaft member in the axial direction so that the shaft end of the first shaft member is in close contact with the case. An elastic member for urging the member is provided.

 In the invention of claim 1, the elastic member acts so as to press the shaft end of the first shaft against the case, so that even if high-load vibration and high-frequency vibration such as a high-frequency vibration force are input, the first member is not pressed. The case member suppresses the rise of the case force, and a constant friction torque is always generated between the first shaft member and the case. For this reason, the whole behavior including the first shaft member and the second shaft member to which the first shaft member is screwed is stabilized.

 [0018] In the tensioner according to the second aspect of the invention, the first shaft member and the second shaft member screwed together by the screw portion, and the torsion spring for urging the first shaft member to rotate in one direction. A tensioner that is accommodated in the shaft, converts the rotation biasing force of the torsion spring into the propulsion force of the second shaft member by restraining the rotation of the second shaft member, and converts the first shaft member in the axial direction. It is characterized in that at least two bearing members are arranged in the case.

 According to the second aspect of the present invention, since the support member supports the first shaft member at at least two places, the first shaft member is firmly supported. For this reason, even if lateral vibration is input, the overall behavior including the first shaft member and the second shaft to which the first shaft member is screwed, which prevents the first shaft member from falling down, Becomes stable.

 [0020] In the tensioner according to the third aspect of the present invention, the first shaft member and the second shaft member screwed by the screw portion, and a torsion spring for urging the first shaft member to rotate in one direction. A tensioner accommodated in the first shaft member for restraining the rotation of the second shaft member and converting the rotational urging force of the torsion spring into the propulsion force of the second shaft member, wherein the shaft end of the first shaft member is provided. An elastic member is provided for urging the first shaft member in the axial direction so that the first shaft member is in close contact with the case, and a support member for supporting the first shaft member at at least two positions in the axial direction is disposed in the case. It is characterized by having been done.

[0021] In the invention of claim 3, since the elastic member acts to press the shaft end of the first shaft against the case, the first shaft member suppresses the rise of the case force and the bearing member. Supports the first shaft member at at least two places, so that the first shaft member is firmly supported. Therefore, even if high vibrations including high load vibrations and high frequency vibrations are input, the first shaft member is not lifted and lateral vibrations are input. Even if force is applied, the first shaft member does not fall. Thereby, even when the engine rotates at a high speed, stable behavior can be performed.

 [0022] The invention of claim 4 is the tensioner according to claim 2 or 3, wherein each of the support members supports an outer peripheral surface of the first shaft member.

 In the invention of claim 4, since the bearing member supports the outer peripheral surface of the first shaft member, even if the shaft end of the first shaft member is subjected to a groove force or other processing. However, the first shaft member can be supported independently of these processes. For this reason, the first shaft member can be stably supported.

 [0024] The invention of claim 5 is the tensioner according to any one of claims 114, wherein the first shaft member includes a shaft portion supported by the support member and the first shaft member. The second shaft member is divided into screw shaft portions to be screwed together, and these are connected in a mutually engaged state.

 [0025] In the invention of claim 5, the divided shaft portion and the threaded shaft portion are engaged with each other, so that they are integrally rotated. For this reason, it can operate like a single shaft member.

 [0026] In addition, according to the invention of claim 5, when the lateral vibration from the engine side is input to the second shaft member, the lateral vibration is applied to the screw shaft portion screwed to the second shaft member. When transmitted, the screw shaft portion performs a swing motion following the lateral vibration. This swing motion can attenuate or reduce the lateral input load. Even at this time, the shaft portion engaged with the screw shaft portion does not fall because at least two portions are firmly supported by the support member. For this reason, the behavior as a whole is stabilized.

 Brief Description of Drawings

FIG. 1 is a cross-sectional view of a tensioner according to Embodiment 1 of the present invention.

 FIG. 2 is a sectional view of a tensioner according to a second embodiment of the present invention.

 FIG. 3 is a cross-sectional view of a tensioner according to Embodiment 3 of the present invention.

 FIG. 4 is a cross-sectional view of a ring plate as a support member.

 FIG. 5 is a cross-sectional view of a ring guide as a support member.

FIG. 6 is a side view showing a state where a first shaft member is divided. FIG. 7 is a sectional view of a tensioner according to a fourth embodiment of the present invention.

 FIG. 8 is a sectional view of a tensioner according to a fifth embodiment of the present invention.

 FIG. 9 is a sectional view showing another structure obtained by dividing the first shaft member.

 10] (a) and (b) are a side view and a front view of a shaft portion in still another structure obtained by dividing the first shaft member. [FIG.

 FIGS. 11 (a) and 11 (b) are a side view and a front view of a screw shaft portion in still another structure obtained by dividing the first shaft member.

 FIG. 12 is a cross-sectional view showing a state where the tensioner is mounted on the engine body.

 FIG. 13 is a sectional view showing a general tensioner.

 Explanation of symbols

[0028] 2 cases

 3 First shaft member

 4 Second shaft member

 5 Torsion spring

 8 Male thread

 9 Female thread

 15 Receiving seat (bearing member)

 20 Coil spring (elastic member)

 25 Ring guide (support member)

 27 Ring plate (supporting member)

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In each of the embodiments, the same members are denoted by the same reference numerals and correspond to each other.

(Embodiment 1)

 FIG. 1 shows a tensioner A1 according to Embodiment 1 of the present invention, which includes a case 2, a first shaft member 3, a second shaft member 4, a torsion spring 5, a guide 6, and a spacer 7. .

[0031] The case 2 has a body 2a and a flange 2b extending in a direction substantially orthogonal to the body 2a.

. A storage hole 2c extending in the axial direction (propulsion direction) extends from the trunk 2a to the flange 2b. Is formed. The distal end of the storage hole 2c is open, and the assembled body of the first and second shaft members 3, 4, the torsion spring 5, and the spacer 7 is stored in the storage hole 2c.

 [0032] The flange portion 2b is for mounting to an engine main body, which is a device to be used, and has a mounting hole 2d through which a bolt (not shown) screwed to the engine main body penetrates. At the time of attachment to the engine main body, the distal end surface of the flange portion 2b comes into contact with the mounting surface 250 of the engine main body 200 as in FIG.

 The first shaft member 3 is rotated by being urged by the torsion spring 5, and the second shaft member 4 is propelled from the case 2 by the rotation of the first shaft member 3.

 [0034] The first shaft member 3 is formed integrally with the proximal shaft portion 3a and the distal screw shaft portion 3b so as to extend in the axial direction. An external thread 8 is formed on the outer periphery of the. In addition, the base end (left end) of the shaft portion 3a comes into contact with a receiving seat 15 provided in the case 2 so that its rotation is supported. The receiving seat 15 functions as a support member for supporting the first shaft member 3. In the receiving seat 15, the shaft end 3f of the first shaft member 3 abuts in the axial direction, and the first shaft member 3 is supported by the abutment of the shaft end 3f.

 [0035] A slit 3e into which the tip of a winding jig (not shown) for rotating the first shaft 3 is inserted is formed in the shaft end 3f of the shaft portion 3a. The slit 3e communicates with the jig hole 2e formed on the base end face of the lunar portion 2a of the case 2.The tip of the winding jig is inserted into the slit 3e from the jig hole 2e, and the slit 3e is inserted through the slit 3e. By rotating the first shaft member 3, the torsion spring 5 can be wound. In the state shown in FIG. 1, a stopper 16 for preventing rotation of the first shaft member 3 is inserted into the jig hole 2e and the slit 3e. A female screw is formed on the inner surface of the jig hole 2e so that a seal bolt 18 to be described later can be screwed therein.

[0036] The second shaft member 4 is formed in a cylindrical shape, and on the inner surface thereof, a female screw 9 with which the male screw 8 of the first shaft member 3 is screwed is formed. These shaft members 3 and 4 are inserted into the storage hole 2c of the case 2 with the female screw 9 and the male screw 8 screwed together. A cap 10 is attached to the tip of the second shaft member 4, and the spring pin 11 is press-fitted so that the cap 10 is prevented from coming off! Puru. In this embodiment, the torsion spring 5 is arranged on the second shaft member 4 side, and is extrapolated to the screw shaft portion 3b of the first shaft member 3. The torsion spring 5 has one end hook portion 5a inserted into a hook groove (not shown) formed in the case 2 and locked, while the other end hook portion (not shown) has a first shaft member. It is inserted into 3 and locked. Therefore, the first shaft member 3 can be rotated by applying a torque by winding the torsion spring 5.

 [0038] The guide 6 is attached to the tip of the case 2 and is fixed by a circlip 13. The guide 6 has a sliding hole 6a, and the second shaft member 4 passes through the sliding hole 6a so as to be slidable in the axial direction. The inner surface of the sliding hole 6a and the outer surface of the second shaft member 4 are formed in a substantially oval shape, a D-cut, a parallel cut, and other non-circular shapes, whereby the second shaft member 4 can rotate. It will be in a restrained state. A plurality of fixing pieces 6b are formed radially on the outer peripheral side of the guide 6, and these fixing pieces 6b are fitted into cutout grooves formed at the tip end of the case 2 to form the entire guide 6. Is stopped. When the guide 6 is thus stopped from rotating with respect to the case 2, the second shaft member 4 that has penetrated the guide 6 is rotationally restrained by the case 2 via the guide 6.

 The second shaft member 4 is screwed with the screw shaft portion 3b of the first shaft member 3 via the screw portions 8 and 9, and the first shaft member 3 is rotated by the rotational urging force of the torsion spring 5. The torque transmitted from the second shaft member 3 to the second shaft member 4 is transmitted to the second shaft member 4 because the second shaft member 4 is rotationally restrained by the guide 6. Advance and retreat.

 [0040] The spacer 7 has a cylindrical shape, and a threaded portion of the screw shaft portion 3b and the second shaft member 4 is inserted therein. In this case, a flange portion 3c having a large diameter is formed at a boundary portion between the shaft portion 3a and the screw shaft portion 3b in the first shaft member 3, and the spacer 7 has a base end portion formed by a flange. Contacting part 3c. The distal end of the spacer 7 faces the guide 6, and the contact with the guide 6 prevents the first and second shaft members 3 and 4 from coming out of the case 2.

Reference numeral 18 denotes a seal bolt. The stopper 16 is pulled out of the case 2 with the tensioner A1 attached to the engine, and then screwed into a jig hole 2e of the case 2 to thereby fix the jig hole. Acts to prevent oil leakage from 2e. In this embodiment, a coil spring 20 as an elastic member is arranged inside case 2. The coil spring 20 is externally inserted into the shaft portion 3a of the first shaft member 3, and uses a compression spring.

 The coil spring 20 is externally inserted into the shaft portion 3a in a compressed state. At the base end side of the shaft portion 3a, a holding ring 21 is formed integrally and a case is formed. The holding ring 22 is press-fitted into the second storage hole 2c. Both ends of the coil spring 20 are free ends, and are disposed between the press ring 21 and the press ring 22 in a compressed state, so that the shaft end 3f of the first shaft member 3 is always in the receiving seat 15. It is urged to adhere. In other words, the coil spring 20 acts to press the shaft end 3f of the first shaft member 3 against the receiving seat 15, whereby the coil spring 20 is received by the shaft end 3f of the first shaft member 3. It is urged to always contact the case 2 via the seat 15. The shaft portion 3a of the first shaft member 3 penetrates the holding ring 22 in an idle state.

 [0044] By the bias of the coil spring 20 as an elastic member, the shaft end 3f of the first shaft member 3 is pressed against the case 2, so that high vibration including high load vibration and high frequency vibration is generated in the engine. The first shaft member 3 can be prevented from rising from the case 2 even when a force is input. Also, a constant torque is always generated between the first shaft member 3 and the case 2 (receiving seat 15). This makes it possible to perform stable behavior even when a high vibration input is present.

 (Embodiment 2)

 FIG. 2 shows a tensioner A2 according to a second embodiment of the present invention. In this embodiment, a ring guide 25 which is another support member is provided in addition to a support seat 15 as a support member.

 The ring guide 25 has a press-fit step 2g formed on the inner surface of the case 2 facing the shaft portion 3a of the first shaft member 3, and is fixed in the case 2 by being press-fitted into the press-fit step 2g. Is performed. Such a ring guide 25 rotatably supports the outer peripheral surface of the shaft portion 3a.

The shaft portion 3a of the first shaft member 3 is formed with an engaging slit 3h extending along the axial direction, and the hook groove 3f is provided with a hook portion 5b on the other side of the torsion spring 5. Insert It is locked.

 [0048] In such a structure, the shaft portion 3a is supported by the receiving seat 15 on the shaft end portion 3f side, and the intermediate portion is supported by the ring guide 25, so that the first shaft member 3 is provided at two places. It is supported by Case 2 and can provide strong support. For this reason, even if lateral vibration is input via the second shaft member 4, the first shaft member 3 does not fall. Thereby, the first shaft member 3 and the second shaft member 4 can perform a stable operation, and the behavior is stabilized. In this embodiment, the coil spring 20 as the elastic member in the first embodiment is not provided, but the first shaft member 3 is supported at two places to prevent the first shaft member 3 from falling down, so that it is stable. Behavior can be performed.

 (Embodiment 3)

 3 to 5 show a tensioner A3 according to Embodiment 3 of the present invention.

 In the present embodiment, the first shaft member 3 has a structure in which the first shaft member 3 is divided into a shaft portion 31 and a screw shaft portion 32. The shaft portion 31 is located on the proximal end side, and the screw shaft portion 32 is located on the distal end side (on the side of the second shaft member 4), and is a male screw portion for screwing the second shaft member 4 together. 8 is formed on the outer peripheral surface.

 [0051] The shaft portion 31 and the screw shaft portion 32 have a structure in which opposing end surfaces are engaged with each other. That is, as shown in FIGS. 6 and 7, a flange portion 3c with which the spacer 7 contacts is formed on the proximal end surface of the screw shaft portion 32, and a circular cross section is formed from the flange portion 3c. The fitting projection 32a protrudes, and from the fitting projection 32a, an engagement projection 32b having a rectangular cross section protrudes. On the other hand, a fitting groove 3 la having the same shape as the fitting projection 32 a and fitted with the fitting projection 32 a and an engagement projection 32 b are inserted into the end face of the shaft portion 31 on the front end side. Mating slit 3h is formed

As shown in FIG. 3, the hook 5b on the other side of the torsion spring 5 is inserted and locked in the engagement slit 3h of the shaft 31. Therefore, the rotational urging force of the torsion spring 5 acts on the shaft portion 31.

[0053] In a state where the shaft portion 31 and the screw shaft portion 32 are connected in the axial direction, the engagement protrusion 32b is inserted into the engagement slit 3h and engaged with the shaft portion 31 and the screw shaft portion. The shaft 32 can rotate as a body. Thereby, it operates similarly to the first shaft member made of a single rod.

 At the base end side of the shaft portion 31, a holding ring 21 is formed integrally, and a small-diameter rod portion 33 protrudes from the holding ring 21. The slit 3e into which the stopper 16 is inserted is formed on the end surface of the rod portion 33.

 In this embodiment, the rotation of the first shaft member 3 is supported by a ring plate 27 and a ring guide 25 as support members. The ring guide 25 supports the intermediate portion of the shaft portion 31 in the first shaft member 3 by being press-fitted into the press-fitting step portion 2g formed in the case similarly to the second embodiment. FIG. 5 shows this ring guide 25. The outer peripheral surface is press-fitted into the press-fitting step 2g, and the shaft portion 31 is inserted into and supported by the through hole at the center. Thus, the ring guide 25 supports the outer peripheral surface of the shaft portion 31.

 The ring plate 27 is fixed by being press-fitted into the base end side of the storage hole 2c of the case 2. FIG. 4 shows the ring plate 27, in which a through hole 27a into which the rod portion 33 is inserted is formed at the center. The ring plate 27 supports the shaft portion 31 by the inner surface of the through hole 27a. The ring plate 27 supports the outer peripheral surface of the shaft portion 31 together with the ring guide 25. In such a support using the ring plate 27, the rotation torque of the shaft portion 31 does not fluctuate due to the slit 3e that prevents the slit 3e from contacting the case 2, so that the first shaft member 3 can rotate stably. it can.

In such an embodiment, the first shaft member 3 is supported by the case 2 at two places, the ring guide 25 and the ring plate 27, as in the second embodiment, so that a strong support is provided. It can be performed. In particular, in this embodiment, the first shaft member 3 is divided into the shaft portion 31 and the screw shaft portion 32 on the second shaft member 4 side, and the lateral vibration from the engine side is reduced by the second shaft member. When input to the member 4, the lateral vibration is transmitted to the screw shaft portion 32 screwed to the second shaft member 4. As a result, the screw shaft portion 32 performs a swing motion following the lateral vibration, so that the input load in the lateral direction can be attenuated or reduced by the swing motion. Also at this time, the shaft portion 32 with which the screw shaft portion 32 is engaged is supported by the ring guide 25 and the ring plate 27 at two places, so that the shaft portion 32 can fall down. Without force S, and is in a state of being stably supported by Case 2. This stabilizes the overall behavior. In addition, since the first shaft member 3 is composed of the shaft portion 31 and the screw shaft portion 32, there is an advantage that the degree of freedom in assembling the tensioner is increased.

 In this embodiment, the sliding hole 6 a of the guide 6 through which the second shaft member 4 penetrates in a rotation-restricted state is opened so as to be larger than the outer shape of the second shaft member 4. The sliding hole 6a serves to restrict the rotation of the second shaft member 4, and is therefore formed in a non-circular shape similar to the second shaft member 4, but has a diameter equal to that of the second shaft member 4. The opening is larger than the opening. By thus opening the sliding hole 6a widely, a gap can be secured between the sliding hole 6a and the second shaft member 4, and the second shaft accompanying the swing motion of the screw shaft portion 32 can be secured. The swing motion of the shaft member 4 can be secured. As a result, since the screwing between the screw shaft portion 32 and the second shaft member 4 does not force, the screw shaft portion 32 (that is, the first shaft member 3) is moved by the reciprocation of the second shaft member 4. Can smoothly rotate, and smooth operation can be ensured.

 (Embodiment 4)

 FIG. 7 shows a tensioner A4 according to Embodiment 4 of the present invention.

 [0060] In the tensioner A4 in this embodiment, the first shaft member 3 is divided into two members, a shaft portion 31 and a screw shaft portion 32. The shape and connection structure of the shaft portion 31 and the screw shaft portion 32 are the same as those of the tensioner A3 in the third embodiment shown in FIG.

 [0061] Further, in this embodiment, the shaft portion 31 of the first shaft member 3 is supported at two places by the ring guide 25 and the ring plate 27 as support members. The support by the ring guide 25 and the ring plate 27 is the same as that of the third embodiment shown in FIGS.

Further, in this embodiment, a coil spring 20 as an elastic member is provided. The coil spring 20 is disposed in a compressed state between the press ring 21 of the shaft portion 31 of the first shaft member 3 and the ring guide 25 press-fitted in the case 2, whereby the first The shaft end 3f of the shaft member 3 is urged so as to always contact the ring plate 27. Follow The shaft end 3f of the first shaft member 3 is urged via the ring plate 27 in the axial direction so as to be always in close contact with the case 2 as in the first embodiment. Therefore, the first shaft member 3 can be prevented from rising from the case 2 even when high vibration including high-load vibration and high-frequency vibration is input to the engine, and stable even when high vibration is input. It is now possible to perform the following actions.

Further, in this embodiment, similarly to the third embodiment, the first shaft member 3 includes a shaft portion 31 supported by the ring guide 25 and the ring plate 27, and a second shaft member. 4 is divided into a screw shaft portion 32 that is screwed to the screw shaft portion 32, and the lateral vibration input to the second shaft member 4 from the engine-side force causes the screw shaft portion 32 to perform a swing motion following the lateral vibration. The lateral input load can be attenuated or relieved by the swinging motion, and the force is also controlled by the ring guide 25 and the ring plate 27 supporting the shaft 32 where the screw shaft 32 is engaged. Therefore, it is stably supported by Case 2 where it cannot fall down. Thereby, the behavior as a whole is stabilized. In order to secure such a swinging motion, the sliding hole 6a of the guide 6 through which the second shaft member 4 penetrates in a rotation-restricted state is opened so as to be larger than the outer shape of the second shaft member 4. It does.

 As described above, in this embodiment, even if high vibration is input, the first shaft member is not lifted, and even if horizontal vibration is input, the first shaft member is swung to perform lateral vibration. Damping and mitigation allow stable behavior even when the engine is running at high speed. In addition, since the rotation torque of the shaft portion 31 does not fluctuate due to the slit 3e that prevents the slit 3e of the shaft portion 31 from contacting the case 2, the first shaft member 3 can rotate stably. it can.

 (Embodiment 5)

 FIG. 8 shows a tensioner A5 according to Embodiment 5 of the present invention.

[0066] In the tensioner A5 of this embodiment, the first shaft member 3 is divided into two members, a shaft portion 31 and a screw shaft portion 32, as in the third and fourth embodiments. In a state where the coil spring 20 as a flexible member is compressed, the coil spring 20 is disposed between the press ring 21 of the shaft portion 31 of the first shaft member 3 and the ring guide 25 press-fitted in the case 2. The shaft end 3f of the first shaft member 3 is urged so as to be always in close contact with the ring plate 27 (that is, the case 2).

 [0067] In this embodiment, an intermediate portion of the shaft portion 31 of the first shaft member 3 is supported by the ring guide 25 as a support member, and the shaft end 3f of the shaft portion 31 is supported by the support member as a support member. It is supported by contacting the seat 15.

 In such an embodiment, since the shaft end 3f of the first shaft member 3 is pressed against the case 2 by the bias of the coil spring 20, even if high vibration is input from the engine, the first The lifting of the shaft member 3 from the case 2 is suppressed. Further, even if lateral vibration is input from the engine side to the second shaft member 4, the screw shaft portion 32 screwed with the second shaft member 4 performs a swing motion following the lateral vibration. The input force in the lateral direction can be damped or reduced, and the shaft part 32 with which the screw shaft part 32 is engaged is supported at two places by the ring guide 25 and the ring plate 27. Nagu The overall behavior is stable. Therefore, even when the engine rotates at high speed, stable behavior can be performed. Also in this embodiment, the sliding hole 6a of the guide 6 through which the second shaft member 4 penetrates in the rotation-restricted state is opened so as to be larger than the outer shape of the second shaft member 4. In addition, the swing motion of the screw shaft portion 32 and the second shaft member 4 is ensured.

 (Embodiment 6)

 In this embodiment, another structure in which the first shaft member 3 is divided into a shaft portion 31 and a screw shaft portion 32 is shown.

 [0070] In FIG. 9, the fitting projection 32a of the screw shaft portion 32 is tapered and rises from the flange portion 3c. Correspondingly, the fitting groove 31a of the shaft portion 31 is formed in a tapered shape so that the fitting protrusion 32a comes into close contact. With such a structure, the engagement between the shaft portion 31 and the screw shaft portion 32 can be performed firmly.

In FIGS. 10 and 11, the fitting protrusion 32a of the screw shaft portion 32 is formed by a hexahedron (see FIG. 11), and the fitting groove 31a of the shaft portion 31 corresponds to the fitting protrusion 32a. It is formed in the shape of a groove. In the state of fitting with these fitting projections 32a and fitting grooves 31a, there is an advantage that the coupling of the shaft portion 31 and the screw shaft portion 32 can be performed firmly. [0072] In the above embodiment, the first shaft member 3 is supported at two places, but in the present invention, the first shaft member 3 may be supported at three or more places.

 Industrial applicability

According to the tensioner of the present invention, since the first shaft member does not rise or fall, stable behavior can be performed even when the engine rotates at high speed.

Claims

The scope of the claims  [1] A first shaft member and a second shaft member screwed by a screw portion and a torsion spring for urging the first shaft member to rotate in one direction are housed in a case, and the second shaft member is provided. A tensioner for restricting the rotation of the torsion spring and converting the rotation urging force of the torsion spring into the propulsion force of the second shaft member,  A tensioner, comprising: an elastic member that urges the first shaft member in the axial direction so that the shaft end of the first shaft member is in close contact with the case.  [2] The first shaft member and the second shaft member screwed by the screw portion, and a torsion spring for urging the first shaft member to rotate in one direction are housed in the case, and the second shaft member is provided. A tensioner for restricting the rotation of the torsion spring and converting the rotation urging force of the torsion spring into the propulsion force of the second shaft member,  A tensioner, wherein a support member for supporting the first shaft member at at least two positions in an axial direction is disposed in a case.  [3] The first shaft member and the second shaft member screwed together by the screw portion, and a torsion spring for urging the first shaft member to rotate in one direction are housed in the case, and the second shaft member is provided. A tensioner for restricting the rotation of the torsion spring and converting the rotation urging force of the torsion spring into the propulsion force of the second shaft member,  An elastic member for biasing the first shaft member in the axial direction is provided so that the shaft end of the first shaft member is in close contact with the case, and at least two elastic members in the axial direction are provided for the first shaft member. A tensioner characterized in that a bearing member to be supported at a location is arranged in a case.  [4] The tensioner according to claim 2 or 3, wherein each of the support members supports an outer peripheral surface of the first shaft member.  [5] The tensioner according to any one of [14] to [14], wherein the first shaft member is formed by screwing a shaft portion supported by the support member and the second shaft member. A tensioner, wherein the tensioner is divided into screw shaft portions, and these are connected in a mutually engaged state.