JP3302827B2 - Auto tensioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention applies a predetermined tension to, for example, a V-belt or the like for driving accessories by an automobile engine, and automatically controls a damping force for a tension adjusting operation in accordance with a change in the tension. The present invention relates to an auto-tensioner that is changed, and particularly to a measure for facilitating an assembling operation and reducing a manufacturing cost.

[0002]

2. Description of the Related Art As an automatic tensioner of this type, for example, one disclosed in Japanese Patent Publication No. 62-2182 is generally known, and a belt pulley wound between a driving pulley and a plurality of driven pulleys is known. Press the span between
It is used to stably transmit the rotational force of the driving pulley to all the driven pulleys.

More specifically, as shown in FIG. 5, a fixing member A having a shaft portion a and fixed to a fixed body such as an automobile engine, and a rotatable shaft member a of the fixing member A are provided. The boss b has an externally fitted boss b, and an arm d is rotatably supported at an end of the boss b so as to rotatably support the pulley c around an axis parallel to the rotation axis of the boss b. And a rotating member B rotatably supported by the fixed member A. A torsion coil spring C for urging the rotating member B to rotate in the belt tension direction with respect to the fixed member A is disposed on the outer peripheral side of the boss portion b of the rotating member B. An insert bearing e is provided between the shaft portion a of the fixed member A and the boss portion b of the rotating member B, a spring support f is provided on the outer peripheral side of the boss portion b, and a shaft portion a of the fixed member A is further provided. A thrust washer h is disposed between the front plate g attached to the tip and the boss b of the rotating member B as a resin damping component for damping the rotation of the rotating member B. I have.

For example, the case of the spring support f will be described. As shown in FIG. 6, the spring support f includes a cylindrical main body i having both ends opened,
And a flange j extending radially outward from the lower edge of the main body i. When the belt tension is rapidly increased and the rotating member B is rotated in the direction opposite to the biasing direction, the torsional coil spring C reacts against the torque applied to the end on the fixed member A side. , The main body i of the spring support f is pressed inward in the radial direction, and the pressed portion is pressed against the boss b of the rotating member B. As a result, the inner peripheral surface of the spring support main body i and the outer peripheral surface of the boss portion b are in line contact with each other to generate sliding friction, and the frictional force damps the rotation of the rotating member B to reduce the rattling of the belt. It has been made to suppress.

[0005]

However, in the conventional auto tensioner, the insert bearing e,
Since the three independent damping parts of the spring support f and the thrust washer h must be incorporated, there is a problem that the assembly is troublesome.

[0006] Further, each of the above damping parts is a resin molded product, and therefore, there is a problem that the manufacturing cost of the auto tensioner is high because a mold is required for each of them.

Further, in the main body i of the spring support f, only the portion that is actually pressed by the torsion coil spring C is necessary for generating damping, but it can be assembled without positioning in the circumferential direction. Because of the cylindrical shape, most parts other than the above-mentioned parts are functionally unnecessary, and there is also a problem that the resin material is wasted correspondingly.

The present invention has been made in view of the above points, and a main object of the present invention is to improve the shape of a damping component so as to reduce the number of damping components without impairing damping performance. Is to facilitate the assembling work.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, the insert bearing and the spring support are integrated into one component, thereby reducing the number of damping components. The assembly work has been simplified.

Specifically, the present invention has a shaft portion,
A fixing member that can be fixed to the fixed body, and a pulley that has a boss portion rotatably externally fitted to the shaft portion of the fixing member from the distal end thereof and that can rotate around an axis parallel to the rotation axis. A torsion coil spring interposed between the fixed member and the rotating member to bias the rotating member to rotate in a predetermined direction with respect to the fixed member; An insert bearing disposed between the boss of the moving member and having an outer peripheral surface slidably contacting the inner peripheral surface of the boss in a state of being prevented from rotating toward the fixed member; A spring support that allows the inner peripheral surface of the main body to be in sliding contact with the outer peripheral surface of the boss portion in a state in which the belt is stopped against the fixed member side, and the belt is pressed against the pulley by the rotation urging force of the rotation member. While the predetermined tension is applied, the rotating member rotates When the torsion coil spring is rotated in a direction opposite to the biasing direction, the torsion coil spring presses the spring support against the boss portion of the rotating member, and the gap between the inner peripheral surface of the spring support and the outer peripheral surface of the boss portion and the inner peripheral surface of the boss portion and the insert bearing. An auto-tensioner that generates sliding friction with the outer peripheral surface and damps the rotation of the rotating member by these factors is premised.

Further, the insert bearing and the spring support are provided integrally.

According to a second aspect of the present invention, in the first aspect of the present invention, the insert bearing and the spring support are combined with the shaft base end of the fixed member and the boss of the rotating member located on the shaft base end side. Integrate in the space between the open end.

According to a third aspect of the present invention, in the second aspect of the present invention, the spring support is formed in one cross-section extending in the direction of the rotation axis along the outer peripheral surface of the boss portion of the rotation member from the connection portion with the insert bearing. It has an arc-shaped first wall. Then, the wall portion is positioned at a circumferential position where the wall is pressed against the boss portion of the rotating member under the pressure of the torsion coil spring in a state where the insert bearing is stopped against the fixed member.

According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, in addition to the first wall portion,
One or more second wall portions each extending in the direction of the rotation axis along the outer peripheral surface of the boss portion of the rotating member from the connection portion with the insert bearing and each elastically contacting the outer peripheral surface of the boss portion of the rotating member. Form.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, each wall portion is configured such that a front side edge of the wall in the rotational biasing direction elastically contacts the outer peripheral surface of the boss portion of the rotary member. .

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a slit extending from the front edge in the rotational biasing direction to near the rear edge is provided between each wall and the connecting portion to the insert bearing.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the end of the rear edge in the rotational biasing direction of each slit is cut into a circular shape having an inner diameter larger than the gap between the slits. .

[0018]

According to the above construction, in the first aspect of the present invention, since the insert bearing and the spring support are provided integrally, both damping parts are treated as one part when assembling the auto tensioner, and one assembling is performed. The two work pieces can be assembled at the same time, thereby facilitating the assembly work which is conventionally performed separately. In addition, since both parts are integrated, it is possible to simultaneously mold them with a single mold, thereby reducing the number of molds for molding the damping parts and reducing the manufacturing cost of the auto tensioner. Reduction can be achieved.

According to the second aspect of the present invention, the insert bearing and the spring support are formed in a space between the base end of the fixed member and the opening end of the boss of the rotating member located on the base end side of the shaft. Are integrated. This space is
In order to prevent the boss portion of the rotating member and the portion of the fixed member from interfering with each other when the rotating member is rotated, it is formed and secured in an annular shape. Accordingly, the two members are integrally connected by utilizing this space, so that the spring support and the insert bearing can be integrated with each other without significantly changing the shape of the rotating member and the fixing member. Can be done.

According to the third aspect of the present invention, the first wall portion of the spring support has one cross-sectional circle extending in the direction of the rotation axis along the outer peripheral surface of the boss portion of the rotation member from the connection portion with the insert bearing. An arc-shaped first wall is provided. That is, as compared with the conventional one, the peripheral part other than the first wall is removed. The first wall portion is positioned at a circumferential position where the insert bearing is pressed against the boss portion of the rotating member under the pressure of the torsion coil spring in a state where the insert bearing is prevented from rotating toward the fixed member. As in the prior art, sliding friction is generated between the inner peripheral surface of the spring support and the outer peripheral surface of the boss portion, and between the inner peripheral surface of the boss portion and the outer peripheral surface of the insert bearing, whereby the rotation of the rotating member is damped. Therefore, in the second aspect of the present invention, an unnecessary portion of the spring support that is not pressed by the torsion coil spring can be omitted, and a damping generation mechanism by the pressing of the torsion coil spring can be secured as before.

According to the fourth aspect of the present invention, the first and second wall portions of the spring support are in elastic contact with the outer peripheral surface of the boss portion of the rotating member, so that there is no gap between the spring support and the boss portion. Thus, a new sliding resistance is generated which does not depend on the pressing force of the torsion coil spring. Therefore, according to the third aspect of the present invention, a new damping force due to the sliding resistance between the spring support and the boss of the rotating member is applied to the auto tensioner.

According to the fifth aspect of the present invention, each of the walls has a front edge in the rotational biasing direction in elastic contact with the outer peripheral surface of the boss of the rotary member. Therefore, when the rotation member rotates in the rotation biasing direction, the outer peripheral surface of the boss portion slides in the forward direction with respect to the front edge of each wall portion. Rotates smoothly. On the other hand, when the rotating member rotates in the direction opposite to the direction of the urging, the outer peripheral surface of the boss slides in the opposite direction with respect to the front edge of each wall, so that the self-boosting effect works. The rotation of the rotation member is damped by a large force. Therefore,
According to the fourth aspect of the present invention, the direction is given to the new damping force, and when the rotating member is rotated in the direction opposite to the rotational biasing direction, the rotation is damped. .

According to the sixth aspect of the present invention, each of the wall portions is formed by a slit between the wall portion and a connecting portion to the insert bearing.
The connecting portion is easily elastically deformed in the direction in which the leading edge in the rotational urging direction elastically contacts the outer peripheral surface of the boss portion. Therefore, according to the fifth aspect of the present invention, the elasticity of the front edge of each wall portion with respect to the outer peripheral surface of the boss portion is improved, and the damping performance with respect to the rotation in the direction opposite to the rotation biasing direction of the rotation member is improved. On the other hand, the slidability with respect to the rotation of the rotation member in the rotation urging direction is improved.

According to the seventh aspect of the present invention, each of the slits has a circular edge having an inner diameter larger than the gap between the slits. When stress due to the elastic deformation operation is concentrated on the peripheral edge of the slit end of the wall, the stress is dispersed, so that in the invention of claim 6, each wall is designed to withstand a large load during operation. Become.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the entire configuration of an auto-tensioner according to this embodiment. The auto-tensioner includes a fixing member 1 made of a metal such as an aluminum alloy and the like, which can be fixed to a fixed body such as an automobile engine. 1 and a metal rotating member 2 supported rotatably about a rotation axis P, and is contracted between the fixed member 1 and the rotating member 2 so that the rotating member 2 A torsion coil spring 3 for urging the fixing member 1 to rotate counterclockwise in FIG. 2 is provided.

The fixing member 1 includes a cylindrical rear cup portion 1a having an opening on the front side (upper side in FIG. 1), and a shaft portion 4 extending in the direction of the rotation axis P from the center of the bottom wall of the rear cup portion 1a. And fixed to a fixed body at a mounting portion (not shown). In the peripheral wall of the rear cup portion 1a, a proximal locking hole 5 penetrating through the peripheral wall in the radial direction is provided.
Are formed.

The rotating member 2 is on the rear side (the lower side in FIG. 1).
And a front cup portion 2a whose opening portion faces the opening portion of the rear cup portion 1a; and a shaft portion 4 of the fixing member 1 extending from the center of the bottom wall of the front cup portion 2a in the direction of the rotation axis P. A boss portion 7 fitted externally from a front end side of the front cup portion 2 via a synthetic resin insert bearing 6 having a cylindrical shape, and protruding radially outward on the outer periphery of the front cup portion 2a. Rotation axis P of boss 7
And an arm portion 9 on which a pulley 8 is rotatably supported around an axis Q parallel to the pulley 8. The rotating member 2 is rotatably supported by the fixed member 1 at the boss portion 7 and the fixed member 1
Metal front plate 1 attached to the tip of the shaft 4
0 indicates that it has not been removed. A thrust washer 11 made of synthetic resin is interposed between the front plate 10 and the end face of the boss 7 of the rotating member 2. Then, a belt t to be given a predetermined tension, such as a V-belt for driving accessories in an automobile engine, is wound around the pulley 8 as shown by a virtual line in FIG. Also, on the peripheral wall of the front cup portion 2a,
A tip locking hole 12 penetrating the peripheral wall in the radial direction is formed.

The torsion coil spring 3 has a shape in which the main body is left-handed, and both the rear end 3a located on the rear side and the distal end 3b located on the front side project radially outward from the main body. I have. The base end 3a is a base end locking hole 5 in the peripheral wall of the rear cup portion 1a of the fixing member 1.
The tip 3b is a front cup 2a of the rotating member 2.
Each of the ends 3a, 3b is restricted from moving in the circumferential direction by being penetrated and locked in the radial direction in the distal end locking hole 12 in the peripheral wall. And these two end portions 3a,
When the main body is operated in the direction in which the diameter is increased while the main body 3b is locked, the rotary member 2 is biased to rotate in a predetermined direction.

The inner and outer peripheral surfaces of the insert bearing 6 are both formed in a tapered cross section with a small diameter at the front side, and accordingly, the outer peripheral surface of the shaft portion 4 and the inner peripheral surface of the boss portion 7 are both formed. It has a similar tapered cross section. Further, a key groove (not shown) extending in the direction of the rotation axis P is provided on the outer periphery of the shaft portion 4, and a key portion 6a engaging with the key groove is provided on the inner periphery of the insert bearing 6, respectively. As a result, the rotation of the insert bearing 6 on the fixing member 1 side is stopped.

Further, a spring support 13 made of synthetic resin is interposed on the outer peripheral side of the boss 7 of the rotating member 2. The spring support 13 has an outward flange 13a in contact with the inner surface of the bottom wall of the rear cup portion 1a, and the flange 13a is pressed against the inner surface of the bottom wall by the compressive biasing force of the torsion coil spring 3.

As a feature of the present invention, the insert bearing 6 and the spring support 13 are fixed to the fixing member 1.
The space between the base end of the shaft 4 and the opening end of the boss 7 of the rotating member 2 located on the base end side of the shaft 4, that is, along the lower opening edge of the boss 7 in FIG. Are integrated at the connecting portion 14 in a state in which the annular space located at the position is used. The spring support 13 body facing the outer peripheral surface of the boss portion 7 of the rotating member 2 is divided into two parts 6 and 13 by breaking at the connecting portion 14 (hatched portion in FIG. 3). As shown in an exploded perspective view of a embodied state), first and second two wall portions 15, 15 arranged in the circumferential direction respectively extend from a connection portion 14 with the insert bearing 6 to an outer peripheral surface of the boss portion 7. Along the direction of the rotation axis P. The two wall portions 15 and 15 are opposed to each other in a diametrical direction orthogonal to the rotation axis P.
When the insert bearing 6 is stopped by the shaft 4 of the fixed member 1, the first wall 15 is pressed by the torsion coil spring 3 and pressed against the boss 7 of the rotating member 2. It is designed to be positioned in the direction.

Further, each of the wall portions 15 is provided with a slit 1 extending from the front edge 15a in the rotational biasing direction to the vicinity of the rear edge 15b.
The front edge 15a of each wall portion 15 is formed in a shape that makes elastic contact with the outer peripheral surface of the boss portion 7 of the rotating member 2 respectively.
Also, the end 16a on the rear edge 15b side of each slit 16 is
It is notched in a circular shape having an inner diameter larger than the gap of the slit 16.

Therefore, according to this embodiment, since the insert bearing 6 and the spring support 13 are provided integrally, the two damping parts 6, 13 can be assembled simultaneously as one part at the time of assembling the auto tensioner. In addition, it is possible to facilitate the assembling work conventionally performed separately. In addition, since both members 6 and 13 are integrated, they can be integrally molded with one mold at the same time, so that the insert bearing 6, the spring support 13 and the thrust washer 1 can be integrally molded.
The number of dies for molding each of the three damping parts can be reduced from three to two to reduce the manufacturing cost of the auto tensioner.

At this time, since the insert bearing 6 and the spring support 13 are integrated by utilizing the empty space below the boss 7 of the rotating member 2, the rotating member 2 and the fixed member 1 are largely integrated. It is not necessary to make a significant shape change, so that an increase in cost due to such a shape change can be avoided.

Further, the main body of the spring support 13 is connected to the first wall portion 15 which is pressed by the torsion coil spring 3.
And a second wall portion 1 disposed opposite to the first wall portion 15.
5 and the cylindrical portion of the conventional spring support is formed in a shape excluding a portion that does not contribute to the occurrence of damping, so that waste of the resin material can be eliminated. By the way, in the case of this embodiment, 20% of the resin material can be saved, which can contribute to the weight reduction and cost reduction of the whole auto tensioner.

Thus, in the auto-tensioner having the above-described structure, the boss 7 of the rotating member 2 is pressed by the compression biasing force of the torsion coil spring 3 in accordance with the fluctuation of the tension of the belt t wound around the pulley 8 of the rotating member 2. One wall 15 of the body of the spring support 13 is pressed between the end face of the boss 7 and the lower surface of the thrust washer 11 by being pressed against the thrust washer 11.
Is pressed against the boss 7 of the rotating member 2 by the pressing force of the torsion coil spring 3, and the boss 7 of the rotating member 2 further twists between the inner peripheral surface of the wall 15 and the outer peripheral surface of the boss 7. The pressing force of the coil spring 3 presses the insert bearing 6 to generate frictional forces between the inner peripheral surface of the boss 7 and the outer peripheral surface of the insert bearing 6. Damped.

Since the two walls 15 of the main body of the spring support 13 have their front edges 15a in the rotational biasing direction resiliently contact the outer peripheral surface of the boss 7 of the rotary member, respectively. When the rotary member 2 rotates in the rotation biasing direction, the outer peripheral surface of the boss portion 7 slides in the forward direction with respect to the front edge 15a of each wall portion 15, so that the sliding resistance is small, and Can be smoothly rotated. On the other hand, when the turning member 2 turns in the direction opposite to the turning biasing direction, the outer peripheral surface of the boss portion 7 slides in the opposite direction with respect to the front edge 15a of each wall portion 15.
A self-boosting action is exerted, whereby the turning of the turning member 2 can be damped with a large force. Therefore, it is possible to increase the damping force with respect to the rotation of the rotation member 2 in the direction opposite to the rotation urging direction of the entire auto tensioner, and to suppress the fluttering of the belt t against a sudden increase in the belt tension. can do.

At this time, each of the wall portions 15 is
6, the front edge 15a is easily elastically deformed in a direction in which the front edge 15a elastically contacts the outer peripheral surface of the boss portion 7, so that the elasticity of the front edge 15a of each wall portion 15 with the outer peripheral surface of the boss portion 7 is improved, While the damping performance with respect to the rotation of the rotation member 2 in the direction opposite to the rotation urging direction can be improved, the slidability of the rotation member 2 with respect to the rotation in the rotation urging direction can be improved. be able to. At this time, since the end 16a on the rear edge 15b side of each slit 16 is cut out in a large-diameter circular shape, the peripheral edge of the end 16a of the slit 16 of each wall 15 is elastically deformed. Therefore, the stress concentration can be dispersed, so that the load resistance during the operation of each wall 15 can be increased.

In the above embodiment, the portion along the outer peripheral surface of the boss portion 7 of the spring support 13 is constituted by the first and second two wall portions 15. It may be composed of only the first wall 15 or the second wall 15.
May be provided with a plurality of walls, and may be constituted by three or more walls.

[0040]

As described above, according to the first aspect of the present invention, the insert bearing is provided between the shaft of the fixed member and the boss of the rotating member externally fitted to the shaft. A spring support is arranged on the outer peripheral side of the boss portion of the rotating member, and the rotating member is rotated by a torsion coil spring interposed between the fixed member and the rotating member on the outer peripheral side of the spring support. The automatic rotation is performed in such a manner that the belt is rotated in the biasing direction to apply tension to the belt, while the rotation in the direction opposite to the biasing direction of the rotating member is damped by the insert bearing and the spring support as the belt tension increases. In the tensioner, the above insert bearing and spring support are provided integrally, so when assembling the auto tensioner, both damping parts are treated as one part and assembled at the same time. It is possible to simplify the assembling work, while at the same time, it is possible to simultaneously mold both parts integrally with a single mold, reducing the number of dies for molding damping parts. Thus, the manufacturing cost of the auto tensioner can be reduced.

According to the second aspect of the present invention, the insert bearing and the spring support are provided between the base end of the fixing member and the opening end of the boss of the rotating member located on the base end side of the shaft. In this case, the insert bearing and the spring support can be integrated without significantly changing the shape of the rotating member and the fixing member.

According to the third aspect of the present invention, one first wall portion of the spring support extends from the connection portion with the insert bearing along the outer peripheral surface of the boss portion of the rotation member in the direction of the rotation axis. Since the wall portion is positioned at a circumferential position where the boss portion is pressed under the pressure of the torsion coil spring in a state where the insert bearing is stopped against the fixed member, the wall portion of the torsion coil spring is formed. Unnecessary portions of the spring support main body which are not pressed by the torsion coil spring are omitted while maintaining the damping generating mechanism by the pressing force, and the waste is reduced by that amount.

According to the fourth aspect of the present invention, one or more second wall portions arranged in the circumferential direction together with the first wall portion on the spring support are respectively rotated from a connection portion with the insert bearing. The spring support body and the rotating member are provided so as to extend in the direction of the rotation axis along the outer peripheral surface of the boss portion of the member, and to make each wall portion elastically contact the outer peripheral surface of the boss portion of the rotating member. A new sliding resistance independent of the pressing force of the torsion coil spring can be generated between the boss portion and the boss portion, and a new damping force can be added to the auto tensioner.

According to the fifth aspect of the present invention, each of the wall portions is
Since the leading edges of the rotation urging directions are in elastic contact with the outer peripheral surface of the boss portion of the rotating member, when the rotating member rotates in the rotational urging direction, it slides on the outer peripheral surface of the boss portion. While the resistance can be reduced and the rotating member can be smoothly rotated, when the rotating member rotates in the direction opposite to the rotational biasing direction, the self-boosting action causes the rotating member to rotate. The rotation can be damped with a large force, so that the new damping force can be given a direction and the force can be increased, and the rotation biasing direction of the rotation member as the whole auto tensioner can be adjusted. It is possible to increase the damping force against the rotation in the opposite direction.

According to the invention of claim 6, between each of the wall portions and the connecting portion, the front side edge extends from the front side edge in the rotational biasing direction to the rear side edge, and the terminal end thereof is the rear side edge. Since the slits reaching the front positions of the respective portions are provided, the respective wall portions are easily elastically deformed in the direction in which the side edge on the front side in the rotational urging direction with respect to the connecting portion elastically contacts the outer peripheral surface of the boss portion. The new damping force for the rotation of the moving member in the direction opposite to the rotation urging direction can be further increased, while improving the slidability of the rotation member against the rotation urging direction. Thus, the operation of applying tension to the belt by the automatic tensioner can be facilitated.

According to the present invention, the end of each of the slits is formed as a round hole having an inner diameter larger than the gap between the slits. Dispersion of the stress concentrated on the peripheral edge can be achieved, and therefore, load resistance during operation of each wall can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line II of FIG. 2;

FIG. 2 is a plan view showing an auto tensioner according to the embodiment of the present invention.

FIG. 3 is a perspective view showing an insert bearing and a spring support.

FIG. 4 is an exploded perspective view showing a state where an insert bearing and a spring support are broken at a connecting portion.

FIG. 5 is a view corresponding to FIG. 1 showing a conventional auto tensioner.

FIG. 6 is a perspective view showing a spring support in a conventional auto tensioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed member 2 Rotating member 3 Torsion coil spring 4 Shaft part 6 Insert bearing 7 Boss part 8 Pulley 13 Spring support 14 Connecting part 15 Wall part 15a Front edge 15b Rear edge 16 Slit 16a End P rotation axis t Belt

Continuation of front page (56) References JP-A-7-113447 (JP, A) JP-A-7-103297 (JP, A) JP-A-7-83295 (JP, A) JP-A-3-66958 (JP) , A) Japanese Utility Model Application Hei 4-27244 (JP, U) Japanese Utility Model Application Hei 5-83516 (JP, U) Japanese Patent Publication No. Sho 62-2182 (JP, B1) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) F16H 7/00-7/24

Claims (7)

(57) [Claims] A fixing member having a shaft portion, the boss portion being rotatably fitted to a shaft portion of the fixing member from a tip side thereof so as to be fixed to the fixed body; A rotating member having a pulley rotatable about a parallel axis; a torsion coil interposed between the fixed member and the rotating member for urging the rotating member to rotate in a predetermined direction with respect to the fixed member A spring, an insert bearing disposed between the shaft portion of the fixed member and the boss portion of the rotating member, the outer peripheral surface of which can be slidably contacted with the inner peripheral surface of the boss portion in a state of being stopped against the fixed member side; A spring support disposed on the outer peripheral side of the boss portion of the rotating member, the inner peripheral surface of the main body being slidably contacting the outer peripheral surface of the boss portion in a state of being prevented from rotating on the fixed member side; The belt is pressed against the pulley by the dynamic urging force to apply a predetermined tension, while the belt tension varies. When the rotating member is rotated in the direction opposite to the rotation biasing direction, the torsion coil spring presses the spring support against the boss portion of the rotating member, and the inner peripheral surface of the spring support and the outer peripheral surface of the boss portion are rotated. In the auto-tensioner, which generates sliding friction between the inner peripheral surface of the boss portion and the outer peripheral surface of the insert bearing, and damps the rotation of the rotating member, the insert bearing and the spring support are:
An auto tensioner characterized by being provided integrally. 2. The auto-tensioner according to claim 1, wherein the insert bearing and the spring support are formed between a shaft base end of the fixed member and a boss opening end of a rotating member located on the shaft base end side. An auto tensioner characterized by being integrated in a space between the auto tensioners. 3. The auto-tensioner according to claim 2, wherein the spring support has one arc-shaped cross-section extending in the direction of the rotation axis along the outer peripheral surface of the boss portion of the rotation member from the connection portion with the insert bearing. The wall portion is positioned at a circumferential position where the wall is pressed against the boss portion of the rotating member under the pressure of the torsion coil spring in a state where the insert bearing is stopped against the fixed member. An auto-tensioner, characterized in that 4. The auto-tensioner according to claim 3, wherein the spring support includes, in addition to the first wall portion, a rotation shaft center direction along a boss portion outer peripheral surface of the rotation member from a connection portion with the insert bearing. An auto-tensioner, wherein at least one second wall portion is formed, the second wall portion having a shape extending to the outer periphery and being in elastic contact with the outer peripheral surface of the boss portion of the rotating member. 5. The automatic tensioner according to claim 4, wherein each of the wall portions has a side edge on the front side in the rotational biasing direction elastically contacting the outer peripheral surface of the boss portion of the rotary member. Tensioner. 6. The auto-tensioner according to claim 5, wherein a slit extending from the front edge in the rotational biasing direction to near the rear edge is provided between each wall portion and the connecting portion to the insert bearing. Features an auto tensioner. 7. The auto-tensioner according to claim 6, wherein an end of a rear edge in a rotational biasing direction of each slit is cut out in a circular shape having an inner diameter larger than a gap between the slits. An auto tensioner characterized by the following.