JP3195860B2 - Auto tensioner mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a predetermined tension to a V-belt or the like for driving accessories by an automobile engine and automatically changing a damping force in accordance with the fluctuation of the tension. TECHNICAL FIELD The present invention relates to a mounting device for mounting an auto-tensioner to a fixed body such as an automobile engine, and more particularly to facilitating an auto-tensioner mounting operation.

[0002]

2. Description of the Related Art An automatic tensioner of this type is generally known, for example, as shown in U.S. Pat. No. 4,473,362, and a span between pulleys of a belt wound between a driving pulley and a plurality of driven pulleys. Press
It is used to transmit the rotational force of the driving pulley to all the driven pulleys.

As shown in FIG. 6, the conventional auto tensioner has a bolt hole b formed in a shaft portion a extending in the direction of the rotation axis P.
A boss portion which is slidably and rotatably fitted to a shaft portion a of the fixing member c from a tip side thereof via a cylindrical resin member d. e, and an arm g that protrudes at the tip to rotatably support the pulley f at an axis parallel to the rotation axis P is protruded, and is rotatably supported by the fixing member c at the boss e. A rotating member h, and a torsion coil spring i interposed between the fixed member c and the rotating member h. The belt is pressed against the pulley f by the rotating urging force of the rotating member h. In addition to applying a predetermined tension, the damping force on the rotating member h is changed according to the change in the tension.

That is, when the belt is wound around the pulley f, a belt reaction force (between the belt and the pulley f) is applied between the cylindrical resin member d and the slidable contact portion between the boss e of the rotating member h. The reaction force) and the urging force of the torsion coil spring i combine to generate a damping force. Then, in this state, if the tension of the belt fluctuates in the decreasing direction, the damping force is reduced due to the reduction of the belt reaction force, which increases the followability of the pulley f to the belt, thereby preventing the belt tension from lowering. You. On the other hand, with respect to the tension of the belt, the damping force also increases due to the increase in the belt reaction force, whereby a large resistance force is applied to the pulley f and the fluttering of the belt is prevented.

[0005]

However, in the above-mentioned conventional auto tensioner, when it is mounted on the fixed body, a bolt hole b in the shaft portion a of the fixed member c and an unshown projection provided on the outer periphery of the fixed member c are provided. A fastening bolt must be inserted through a bolt hole or the like in the mounting flange, and the fastening bolt must be screwed into a screw hole provided in the fixed body using a tool such as a wrench. Therefore, there is a problem that installation work is troublesome.

Further, when the belt intersects the direction of the rotation axis P of the bolt hole, it interferes with the belt and it is difficult to tighten the bolt itself, so that the mounting operation becomes more troublesome.

The present invention has been made in view of the above points, and a main object of the present invention is to make it possible to easily attach an auto tensioner to a fixed body without using a fastening bolt.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of arcuate engagement portions having a predetermined position of a fixed body as a center for attaching a tensioner are provided.
The auto-tensioner is provided with a locking piece that can be engaged in the anti-rotation biasing direction of the rotating member at each of the engagement portions, and by rotating the auto-tensioner in the counter-rotation biasing direction,
The locking piece is engaged with the engaging portion so as to be locked in the rotation axis direction.

Specifically, in the present invention, the fixing member
A turning member having an arm portion rotatably supported by the fixed member about a rotation axis, and a pulley for pressing a belt at a tip end rotatably supported by an axis parallel to the rotation axis; A torsion coil spring interposed between the fixed member and the rotating member for urging the rotating member to rotate in a predetermined direction with respect to the fixing member; An auto-tensioner that applies a predetermined tension by pressing a belt, and changes a damping force on a rotating member generated between sliding portions of the fixed member and the rotating member in accordance with the fluctuation of the tension. A mounting device for mounting the to the fixed body is premised.

A mounting plate portion provided on the fixed body and an arcuate shape provided on the mounting plate portion with a predetermined position as a center for mounting the tensioner. On the other hand, a plurality of engaging portions having a stop portion at the rear end side in the rotational biasing direction, and provided on the outer periphery of the fixing member of the auto tensioner, and engaged with each of the engaging portions through an inlet to the stop portion. And a plurality of possible locking pieces.
Then, with the rotation axis of the auto-tensioner substantially aligned with the tensioner mounting center of the mounting plate portion, the auto-tensioner is rotated to the side opposite to the rotation biasing direction of the rotation member, and The auto-tensioner is configured to be attached to the fixed body via the attachment plate portion by engaging the engagement piece with the engagement portion so as to come into contact with the stop portion through the entrance.

According to a second aspect of the present invention, in the first aspect of the present invention, the mounting plate portion is formed integrally with the fixed body.

According to a third aspect of the present invention, in the first aspect of the present invention, the mounting plate portion is provided separately from the fixed body.

According to the fourth aspect of the present invention, the second aspect or the third aspect is provided.
In the invention, the engaging portion of the mounting plate portion is engaged with the engaging portion in the rotation axis direction of the engaging portion when the engaging piece of the auto tensioner is engaged so as to contact the stop portion. Press against the surface.

According to the fifth aspect of the present invention, the above-mentioned second or third aspect is provided.
In the invention, the locking piece of the auto-tensioner is rotated substantially parallel to the direction in which the belt reaction force is applied to the pulley at the tip of the arm portion of the turning member in a state where the auto-tensioner is attached to the fixed body. It is provided at two positions on a line passing through the heart. Then, when the engagement piece of the mounting plate portion is engaged so that the engagement piece contacts the stop portion, the engagement piece is moved between the engagement surfaces in the rotation axis direction of the engagement portion. To hold the nip.

According to the sixth aspect of the present invention, the second aspect or the third aspect is provided.
In the present invention, there is provided a retaining means for restricting the locking piece of the auto tensioner engaged with the engaging portion of the mounting plate portion from passing through the entrance in the rotating biasing direction of the rotating member.

According to the invention of claim 7, in claim 2 or 3,
In the invention of (1), stop portion adjusting means capable of changing the circumferential position of the stop portion in the engaging portion of the mounting plate portion is provided.

According to the eighth aspect of the present invention, the second or third aspect is provided.
In the invention, the engagement portion adjusting means for changing the circumferential position of the engagement portion of the attachment plate portion around the center of the tensioner mounting at the attachment plate portion is provided.

According to a ninth aspect of the present invention, in the third aspect of the present invention, the mounting plate has an elongated hole through which a fastening bolt for attaching the mounting plate to the fixed body is inserted. When it is loosened, it can move along the surface of the fixed body in the longitudinal direction of the long hole.

[0019]

With the above construction, according to the first aspect of the present invention, when the auto tensioner is mounted on the fixed body, the rotation axis of the auto tensioner is substantially aligned with the tensioner mounting center of the mounting plate portion of the fixed body. Then, the auto-tensioner is rotated to the opposite side of the turning bias direction of the turning member, whereby the auto-tensioner is attached to the fixed body. That is, by the turning operation of the auto-tensioner, each of the locking pieces provided on the outer periphery of the fixing member is engaged with the engaging portion provided so as to extend in the circumferential direction around the tensioner mounting center of the mounting plate portion. The engaging portion is engaged so as to come into contact with the stop portion through the entrance located at the front end side in the rotational biasing direction of the engaging portion. In this engagement state, the locking piece is locked to the engagement portion in the rotation axis direction to restrict the movement in the rotation axis direction, whereby the auto tensioner is securely attached to the fixed body. . Further, in the state where the auto-tensioner is attached in this manner, since the stop portion in contact with the locking piece is located at the rear end side in the rotational biasing direction of the engaging portion, the locking piece is When the pulley at the end of the arm portion of the rotating member in the auto tensioner pushes the belt, the auto tensioner itself receives the belt reaction force when the pulley pushes the belt. Can be prevented from rotating in the direction opposite to the rotational biasing direction, and the auto-tensioner can be mounted on the fixed body in a state capable of coping with the belt reaction force without the need for bolt tightening.

According to the second aspect of the present invention, since the mounting plate portion is formed integrally with the fixed body, the work of mounting the mounting plate portion to the fixed body, which is required when the mounting plate portion is formed separately, becomes unnecessary. Also, parts such as fastening bolts required for the mounting work are not required.

According to the third aspect of the present invention, on the contrary, since the mounting plate is provided separately from the fixed body, when it is difficult to integrally form the mounting plate with the fixed body, For example, by attaching the mounting plate portion to the fixed body in advance, the auto tensioner can be mounted on the fixed body via the mounting plate portion.

According to the fourth aspect of the present invention, the locking piece of the auto tensioner is engaged with the engaging portion of the mounting plate portion so as to abut against the stop portion, and the movement in the direction of the rotation axis is restricted. In this state, when the rotating member of the auto tensioner receives a belt reaction force, the auto tensioner as a whole is deviated from the position of the fixed member fixed to the fixed body toward the rotating member in the direction of the rotation axis. The belt reaction force is applied to the position. As a result, the auto-tensioner tilts in the belt reaction force direction in accordance with the fluctuation of the belt reaction force, and there is a possibility that each locking piece may rattle at each engagement portion. On the other hand, since the locking piece is pressed against the engaging surface in the rotation axis direction of the engagement portion, the movement of the locking piece in the rotation axis direction is restricted, and Sticking is suppressed, and thereby the tilting of the auto tensioner is also suppressed.

According to the fifth aspect of the present invention, the locking pieces of the auto tensioner are respectively located at two positions on a line substantially parallel to the direction of the belt reaction force applied to the turning member and passing through the turning axis of the auto tensioner. In this case, the position of the locking piece is a position where rattling is most likely to occur in the direction of the rotation axis when the auto tensioner is tilted. At this time, since each of the locking pieces is clamped and held between the two contact surfaces in the rotation axis direction of each of the engagement portions, the play is suppressed.
Therefore, rattling of the locking piece itself at a position where rattling is most likely to occur is prevented, so that tilting of the auto tensioner can be effectively suppressed.

According to the sixth aspect of the present invention, the locking piece of the auto-tensioner engaged with the engaging portion of the mounting plate portion attempts to escape from the engaging portion through the inlet in the rotational biasing direction. It is regulated by stopping means. Accordingly, even when a turning force is generated in the rotation biasing direction in the entire auto tensioner due to, for example, a recoil of a belt that is applying a reaction force to the rotation member of the auto tensioner, the locking piece is not moved. A situation in which the auto tensioner is detached from the fixed body due to withdrawal from the engagement portion is prevented.

According to the seventh aspect of the present invention, the circumferential position of the stop portion in the engaging portion can be changed by the stop portion adjusting means, so that the locking piece of the auto-tensioner can be turned by the turning member of the rotating member to the engaging portion of the mounting plate portion. When it is engaged on the opposite side to the moving biasing direction and abuts against the stop, the circumferential position of the locking piece at the engaging portion is changed, and as a result, the rotation biasing direction of the entire auto tensioner is changed. Is changed. Therefore, without changing the internal devices such as the torsion coil spring of the auto tensioner and its end locking position, the rotation urging force of the rotation member is adjusted, and the stop portion is changed in the rotation urging direction. , The rotational urging force becomes strong, and conversely, becomes weaker when the rotational urging direction is changed to the opposite side.

According to the eighth aspect of the present invention, the circumferential position of the engaging portion in the mounting plate portion can be changed by the engaging portion adjusting means. When the locking piece is engaged on the opposite side to the rotation urging direction and abuts against the stop, the circumferential position of the locking piece on the mounting plate portion is changed. The turning position in the force direction is changed.
Therefore, the rotation biasing force of the rotation member is adjusted without changing the internal devices such as the torsion coil spring of the auto tensioner and the end locking position thereof.

According to the ninth aspect of the present invention, when the mounting plate portion is mounted on the fixed body, a fastening bolt inserted into the elongated hole of the mounting plate portion is screwed to the fixed body.
Attach the mounting plate to the fixed body. At this time, when the bolt is loosened, the mounting plate portion can move along the surface of the fixed body in the longitudinal direction of the long hole, and thus the mounting position of the auto tensioner on the fixed body can be adjusted.
For example, if a long hole is provided in the direction to press the belt, it can correspond to the belt length,
Further, when provided along the rotation direction, the rotation urging force is adjusted.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an auto-tensioner A according to this embodiment. The auto-tensioner A is, for example, a metal fixing member 1 fixed to a fixed body such as an automobile engine, and is attached to the fixing member 1 to rotate. A metal turning member 2 rotatably supported about an axis P is interposed between the fixed member 1 and the turning member 2, and the turning member 2 is moved in a predetermined direction with respect to the fixing member 1. And a tubular resin member 6 interposed between the fixed member 1 and the rotating member 2 for damping the rotation of the rotating member 2. I have.

The fixing member 1 has a bottomed cylindrical rear cup portion 1a and a shaft portion 4 extending from the center of the bottom of the rear cup portion 1a in the direction of the rotation axis P. To be fixed to the fixed body. Also,
A base end side locking hole (not shown) penetrating the wall portion of the rear cup portion 1a in the radial direction is formed.

The turning member 2 has a bottomed cylindrical front cup portion 2a having an opening facing the opening of the rear cup portion 1a, and a turning center P direction from the center of the bottom of the front cup portion 2a. A boss portion 7 which extends and is externally fitted to the shaft portion 4 of the fixed member 1 from the front end side through the tubular resin member 6 and a boss portion protruding from the outer periphery of the front cup portion 2a. A pulley 8 rotatably supported by an axis parallel to the center P; and an arm 9 rotatably supported by the fixed member 1 at the boss 7. Further, the boss 7 is prevented from being removed from the shaft 4 at a tip end of the shaft 4 of the fixing member 1 by a not-shown retaining means. On the other hand, a belt s to which a predetermined tension is applied to the pulley 8 such as a V-belt for driving accessories in an automobile engine.
Is wound around. A front end side locking hole 5 (not shown) penetrating the wall portion of the front cup portion 2a in the radial direction is formed in the wall portion. Also,
Both the inner and outer peripheral surfaces of the cylindrical resin member 6 are formed to have a tapered cross section in which the tip end side has a small diameter while being slightly small. Accordingly, the outer peripheral surface of the shaft portion 4 and the inner peripheral surface of the boss portion 7 are also similar. It has a tapered cross section. Note that the cylindrical resin member 6 is prevented from rotating toward the fixing member 1 by means other than the drawing.

The main body of the torsion coil spring 3 is left-handed, and both the base end and the front end 3a are formed to protrude radially outward from the main body. The base portion is radially connected to a base side locking hole in the wall of the rear cup portion 1a of the fixing member 1, and the distal end portion 3a is formed to a distal side locking hole 5 in the peripheral wall of the front cup portion 2a of the rotating member 2. The base end and the distal end 3a are restricted from moving in the circumferential direction. The torsion coil spring 3 rotates in a counterclockwise direction in FIG. 1 by operating in a direction in which the main body expands in a state where the base end and the distal end 3a are locked. It is designed to be energized.

A cylindrical spring support 11 made of synthetic resin is interposed between the base end side of the torsion coil spring 3 and the boss 7. The inner peripheral surface of the spring support 11 can slide on the outer peripheral surface of the boss 7. Further, an outward flange 11a which is in contact with the bottom surface of the rear cup portion 1a is formed at the base opening edge of the spring support 11. The outward flange 11a is pressed by the torsion coil spring 3 so that the rear cup portion 1a
The spring support 11 is fixed to the fixing member 1 side by being pressed against the bottom surface of the fixing member 1. In this fixed state, when the front cup portion 2a rotates clockwise in FIG. 1, the body of the torsion coil spring 3 is reduced in diameter, so that the spring support 11 is tightened and the inner peripheral surface thereof becomes a boss. It comes into pressure contact with the outer peripheral surface of the portion 7, and this also generates a damping force.

On the outer periphery of the rear cup portion 1a of the fixing member 1, two flat locking pieces 12 projecting outward in the radial direction are respectively provided. As shown in FIG. 1, the two locking pieces 12, 12 are located at positions diametrically opposed to each other, and the belt engages a pulley 8 supported by the arm 9 of the rotating member 2 when the auto tensioner A is used. It is located on a line that is substantially parallel to the direction of the reaction force (the direction of the arrow in FIG. 1) and that passes through substantially the rotation axis P. The surface of the locking piece 12 on the fixed body side is formed flush with the outer bottom surface of the rear cup portion 1a. Further, the cross-sectional shape of each locking piece 12 in the protruding direction is a wedge shape in which the rear part is slightly thinner than the front part in the rotation urging direction of the rotation member 2.

On the other hand, FIGS. 4 and 5 show a mounting plate portion B used for mounting the auto tensioner A on a fixed body, and the mounting plate P is provided separately from the fixed body. The mounting plate portion B has a rectangular shape, and is provided at each of the four corners with elongated holes 13 extending substantially linearly in a predetermined direction, and is attached to the fixed body by fastening bolts inserted through these elongated holes 13 to the fixed body. It is made to be screwed on. Incidentally, in this embodiment, the elongated holes 13 are provided along the direction of the belt force acting on the auto-tensioner A mounted on the fixed body C via the mounting plate portion B.

In the mounting plate portion B, two arc-shaped engaging members 14 having the center position as the tensioner mounting center Q are concentric and opposed to each other with the tensioner mounting center Q interposed therebetween. Installed. Each of the engaging members 14 forms an engaging groove 14 a having a concave cross section as an engaging portion with the mounting plate portion B over a substantially circumferential length of the engaging member 14 in a mounted state. Engagement groove 1
4a has the groove bottom face radially inward. Each of the engagement grooves 14a has an entrance 14b located at the front end side of the rotation member 2 in the rotation urging direction in the engagement groove 14a, and a stop portion 14c located at the rear end side in the rotation urging direction. . The locking piece 12 of the auto tensioner A can be inserted into the engagement groove 14a so as to come into contact with the stop portion 14c through the entrance 14b. At a position near the entrance 14c of the engaging member 14, a retaining means 15 for retaining the locking piece 12 inserted into the engaging groove 14a is provided. As shown in FIG. 5, the retaining means 15 has an insertion hole 15a that penetrates the engagement member 14 in the direction of the rotation axis P at the engagement groove 14a, and is inserted into the insertion hole 15a. And a retaining pin 15b whose tip substantially crosses the engaging groove 14a in the groove width direction.

Of the two side walls as the two engagement surfaces in the direction of the rotation axis P of the engagement groove 14a, the side wall surface on the mounting plate portion B side is constituted by the front surface of the mounting plate portion B. The one side wall surface and the other side wall surface formed by the engaging member 14 are parallel to each other. The distance between the two side walls is slightly smaller than the thickness of the front end portion in the rotation biasing direction of the engagement piece 12 and slightly larger than the thickness of the rear end portion. As a result, the locking piece 12 can be easily inserted into the engagement groove 14a, and the inserted locking piece 12 is brought into pressure contact with both side wall surfaces.

The engaging member 14 has an engaging groove adjusting means 16 as an engaging part adjusting means capable of changing a circumferential position of the engaging member 14 on the mounting plate portion B around the tensioner mounting center Q. Specifically, the engagement groove adjusting means 16 is provided with a screw hole 16a provided at each of both ends in the circumferential direction of the engaging member 14, and a predetermined pitch interval in the circumferential direction around the tensioner mounting center Q of the mounting plate portion B. Arranged in
A screw hole 16b corresponding to the screw hole 16a;
And a screw 16c that fastens and fixes the engaging member 14 by being inserted into the screw hole 6b and screwed into the screw hole 16b. The screw 16c is inserted into the screw hole 16a and screwed into the screw hole 16b in a state where the screw hole 16a is aligned with an arbitrary screw hole 16b. Can be changed at every predetermined pitch interval. The stopper 14c of the engaging member 14 is provided with a plurality of shims 17 as stopper adjusting means. By stacking an arbitrary number of shims 17 in the rotating direction, the circumferential direction of the stopper 14c is increased. The position can be finely adjusted and changed to the side of the rotation urging direction.

Further, each of the engaging members 14 is mounted at a position slightly away from the outer diameter of the rear cup portion 1a of the fixing member 1 of the auto tensioner A in the radial direction. That is, between the inner peripheral surface of the engaging member 14 and the outer peripheral surface of the rear cup portion 1a,
4, a certain gap is formed between the groove bottom of the engaging groove 14a and the tip of the locking piece 12, so that, for example, the outer diameter of the rear cup portion 1a is larger than that of the auto tensioner A. The other auto-tensioner having a large size can be mounted on the mounting plate portion 13.

Therefore, according to this embodiment, as shown in FIGS. 1 and 2, when the auto tensioner A is mounted on the fixed body C, for example, the elongated holes 13 of the mounting plate portion B are used.
The mounting plate B is attached to the fixed body C in advance by screwing the fastening bolt 13a inserted into the fixed body C.
Then, the auto tensioner A is mounted on the mounting plate B. Specifically, in a state where the rotation axis P of the auto-tensioner A substantially coincides with the tensioner mounting center Q of the mounting plate portion B, the auto-tensioner A is turned on the opposite side to the rotation biasing direction of the rotation member 2. (Clockwise direction in FIG. 1). That is, by this rotation operation, each of the locking pieces 12 of the auto tensioner A is inserted into the engagement groove 14a of the mounting plate B so as to come into contact with the stop 14b through the inlet 14b. In this inserted state, the locking piece 12 is locked in the engagement groove 14a in the direction of the rotation axis P to restrict the movement in the direction P of the rotation axis. It can be securely mounted on. When the auto-tensioner A is attached in this manner, the stop portion 14 against which the locking piece 12 is in contact is provided.
c restricts the movement of the locking piece 12 in the direction opposite to the rotational biasing direction, whereby the pulley 8 at the tip of the arm 9 of the rotating member 2 in the auto tensioner A pushes the belt s. The auto tensioner A itself can be prevented from rotating due to the belt reaction force.
Can be attached to the fixed body C in a state that can cope with the belt reaction force without taking the trouble of bolting.

When the rotating member 2 receives a belt reaction force in a state where the auto tensioner A is attached, the auto tensioner A as a whole rotates from the position on the fixed member 1 side fixed to the fixed body C. The belt reaction force is applied to a position on the rotating member 2 side deviated in the direction of the axis P.
As a result, the auto-tensioner A tends to tilt in the belt reaction force direction in accordance with the fluctuation of the belt reaction force. Accordingly, there is a possibility that the locking pieces 12 may rattle in the respective engagement grooves 14a. On the other hand, since the locking piece 12 is pressed against the side wall surface in the direction of the rotation axis P by the engagement groove 14a, the movement of the locking piece 12 in the direction of the rotation axis P is restricted. As a result, the rattling is suppressed, whereby the tilting of the auto tensioner A is also suppressed. Further, the locking pieces 12 of the auto tensioner A are located at two positions most parallel to the line substantially parallel to the direction of the belt reaction force and passing through the rotation axis P of the auto tensioner A. Since the stoppers 12 are held by the side walls of each of the engagement grooves 14a so as to be pressed against each other and are restrained from rattling, the tilting of the auto tensioner a can be effectively suppressed.

The retaining piece 15 restricts the locking piece 12 from coming out of the engaging groove 14a in the rotational biasing direction through the inlet 14b. As a result, even if the belt s that applies a reaction force to the rotating member 2 of the auto tensioner A is cut, for example, and the reaction causes the entire auto tensioner A to rotate in the rotation biasing direction,
It is possible to prevent a situation in which the locking piece 12 comes out of the engagement groove 14a and the auto tensioner A comes off the fixed body C.

On the other hand, when the auto-tensioner A is mounted on the fixed body C, the adjusting shim 17 is selectively interposed between the locking piece 12 and the stopping portion 14c so that the circumferential direction of the stopping portion 14c can be improved. The position can be fine-tuned and changed. Therefore, this makes it possible to finely adjust the turning position of the auto tensioner A in the turning biasing direction, and change the internal structure of the auto tensioner A such as the torsion coil spring 3 itself and its end locking position. The rotation urging force of the rotation member 2 can be adjusted without the need. In addition, when the rotational urging force is largely adjusted, it can be performed by changing the circumferential position of the engaging member 14 at the mounting plate portion B by the engaging groove adjusting means 16. In this case, the adjustment shim 17 may be used together.

Further, the fixed body C of the mounting plate portion B itself
Can also be adjusted. That is,
Fastening bolt 1 inserted into long hole 13 of mounting plate portion B
When the screw 3a is screwed to the fixed body C, if the bolt 13a is loosened, the mounting plate portion B can move along the surface of the fixed body C in the longitudinal direction of the long hole 13. Thereby, the attachment position of the auto tensioner A to the fixed body C can be adjusted. More specifically, since the elongated holes 13 are provided along the direction of the belt stress acting on the auto tensioner A, by adjusting the mounting position of the mounting plate portion B in this direction, it is possible to push the belt s. The pressure can be adjusted. Therefore, if the length of the belt s is longer than a predetermined length, for example, after a long use, the mounting position of the mounting plate portion B can be changed to the belt pressing side.

In the automatic tensioner A attached to the fixed body C as described above, when the belt s is wound around the pulley 8 of the rotating member 2, the damping member 6 and the boss of the rotating member 2 are rotated in the automatic tensioner A. The belt reaction force and the urging force of the torsion coil spring 3 are combined between the inner peripheral surface of the portion 7 and the inner peripheral surface of the spring support 11 and the outer peripheral surface of the boss portion 7 to generate a damping force. . When the tension of the belt s decreases in this state, the damping force decreases due to a decrease in the belt reaction force. Then, the rotating member 2 is easily rotated, and the followability of the pulley 8 with respect to the belt s is increased, so that a decrease in the tension of the belt s can be quickly prevented. on the other hand,
With respect to the tension of the belt s, the damping force also increases due to the increase in the belt reaction force, whereby a large resistance force is applied to the pulley 8 to prevent the belt s from fluttering.

In the above embodiment, the mounting plate portion B is provided separately from the fixed body C, but may be integrally formed. In this case, the mounting work of the mounting plate portion to the fixed body, which is required in the case of a separate body, becomes unnecessary, and components such as fastening bolts for mounting are also unnecessary.

In the above embodiment, the mounting plate B
Is provided in a straight line and only in one direction,
For example, it may be provided in an arc shape, or may be provided in a plurality of directions and selectively used.

In the above embodiment, a radial gap is provided between the inner peripheral surface of the engaging member 14 and the outer peripheral surface of the rear cup portion 1a of the fixing member 1 of the auto tensioner A. Positioning means for determining the mounting position of the inner surface of the engaging member on the mounting plate of the auto-tensioner, supporting means for rotatably supporting the auto-tensioner at the time of rotating operation in the radial direction, etc. You may use as.

In the above embodiment, the locking piece 12 of the auto tensioner A is directed outward in the radial direction and the opening side of the engaging groove 14a is directed inward in the radial direction. You may.

Further, in the above embodiment, the groove width between both side wall surfaces of the engagement groove 14a is made constant, but a tapered cross section in which the stop portion side gradually narrows may be used. In this case, a step may be provided on at least one of the side walls at a position where the locking piece of the auto tensioner comes into contact with the stop portion, and the locking piece may be locked by this step.

[0050]

As described above, according to the first aspect of the present invention, when the auto tensioner is mounted on the fixed body, a plurality of locking pieces are provided on the outer periphery of the fixed member of the auto tensioner, while the fixed body is mounted. An arc-shaped engaging portion is formed on the plate portion so that each of the locking pieces is engaged, and the auto-tensioner is rotated in the direction opposite to the direction in which the rotating member is biased to rotate. Since the piece is engaged with the engaging portion of the mounting plate portion, the auto-tensioner can be easily attached to the fixed body by one-touch rotating operation without bolting. In addition, in the mounted state, the movement of the locking piece in the direction opposite to the rotational urging direction can be restricted by the stop located at the rear end side in the rotational urging direction of the engaging portion. The belt can be securely attached to the belt reaction force, and does not impair the original belt tension adjusting function of the auto tensioner.

According to the second aspect of the present invention, since the mounting plate portion is formed integrally with the fixed body, the work of mounting the mounting plate portion to the fixed body is not required, and the parts for mounting are not required.

According to the third aspect of the present invention, since the mounting plate portion is provided separately from the fixed body, even when the fixed body has difficulty in integrally forming the mounting plate portion,
If the mounting plate is mounted on the fixed body, the auto tensioner can be easily mounted on the fixed body via the mounting plate.

According to the fourth aspect of the present invention, when the locking piece of the auto tensioner is engaged with the engaging portion of the mounting plate, the locking piece is rotated by the rotating shaft of the engaging portion. By pressing against the engaging surface in the center direction,
The movement of the locking piece in the direction of the rotation axis can be suppressed, and the rattling at the mounting portion of the auto tensioner can be suppressed.

According to the fifth aspect of the present invention, when the locking piece of the auto tensioner is engaged with the engaging portion of the mounting plate, the locking piece is moved in the direction of the rotation axis of the engaging portion. By holding the pressure between the engagement surfaces, it is possible to surely suppress the backlash in the mounting portion of the auto tensioner, and to fix the locking piece of the auto tensioner to the fixed body of the auto tensioner. The automatic tensioner receives the belt reaction force by providing the two positions on the line substantially parallel to the direction of the belt reaction force applied to the auto tensioner and passing through the substantially rotation axis in the state where the rattling is most likely to occur. Tilting can be effectively suppressed.

According to the sixth aspect of the present invention, the locking piece of the auto tensioner is prevented from falling out of the engaging portion of the mounting plate in the rotational biasing direction by the retaining means. Even if the auto tensioner turns in the turning biasing direction due to a recoil of the belt that gives a reaction force to the turning member of the auto tensioner, the auto tensioner is prevented from being accidentally detached from the fixed body. be able to.

According to the seventh aspect of the present invention, the circumferential direction of the stop portion for positioning in the rotation direction of the auto tensioner by contacting the locking piece of the auto tensioner engaged with the engaging portion of the mounting plate portion. Since the position is changed by the stop portion adjusting means, the rotation position of the entire auto tensioner in the rotation biasing direction can be easily changed, whereby the torsion coil spring of the auto tensioner and its end portion can be changed. The rotation urging force of the rotation member can be adjusted without changing the internal structure such as the locking position.

According to the eighth aspect of the present invention, the circumferential position of the engaging portion in the mounting plate portion is changed by the engaging portion adjusting means. The circumferential position of the stop portion for positioning in the direction can be changed, and the same effect as that of the seventh aspect can be obtained.

According to the ninth aspect of the present invention, when the auto tensioner is mounted on the fixed body via the mounting plate portion separate from the fixed body, the mounting plate portion is formed with a long hole through which a fastening bolt is inserted. The mounting position of the auto-tensioner on the fixed body can be easily adjusted by moving the mounting plate portion in the longitudinal direction of the elongated hole while the fastening bolt is loosened. Therefore, for example, if a long hole is provided in the direction in which the belt is pressed, the auto tensioner can be mounted at a position corresponding to the belt length even when the actual belt length does not match the design value.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which an auto tensioner is mounted on a fixed body via a mounting plate portion in an embodiment of the present invention.

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

FIG. 3 is a right side view showing a cross section of a main part of the auto tensioner.

FIG. 4 is a front view showing a mounting plate portion.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a diagram corresponding to FIG. 3 showing a conventional auto tensioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed member 2 Rotating member 3 Torsion coil spring 8 Pulley 9 Arm part 12 Locking piece 13 Elongated hole 14a Engagement groove (engagement part) 14b Inlet 14c Stop part 15 Stopper means 16 Engagement groove adjusting means (engagement) Part adjusting means) 17 Shim (stop part adjusting means) A Auto tensioner B Mounting plate part C Fixed body P Rotation axis Q Tensioner mounting center

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-10692 (JP, A) JP-A-6-8849 (JP, U) JP-A-60-194655 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F16H 7/12 F02B 67/06

Claims (9)

(57) [Claims] A fixed member, supported by the fixed member so as to be rotatable around a rotation axis,
A rotating member having an arm portion rotatably supported by a pulley that presses a belt at an end thereof with an axis parallel to the rotating axis; and a rotation interposed between the fixed member and the rotating member. A torsion coil spring for urging the member to rotate in a predetermined direction with respect to the fixing member, wherein the rotation urging force of the rotation member presses the belt against the pulley to apply a predetermined tension, and the fixing member And an auto-tensioner adapted to change a damping force on the rotating member generated between sliding portions of the rotating member and the rotating member in accordance with the fluctuation of the tension. A mounting plate portion provided, an arc-shaped portion provided on the mounting plate portion with a predetermined position as a tensioner mounting center, each of which has an inlet at a front end side in the rotation urging direction of the rotation member, and has a rotation urging direction. Stop at rear end A plurality of engaging portions provided on the outer periphery of the fixing member of the auto tensioner, and a plurality of locking pieces that can be engaged with the respective engaging portions through an inlet to a stop portion. When the rotation axis of the auto-tensioner is substantially coincident with the tensioner mounting center, the auto-tensioner is turned to the side opposite to the turning biasing direction of the turning member,
The automatic tensioner is configured to be attached to a fixed body via a mounting plate portion by engaging the locking piece with the engaging portion so as to come into contact with a stop portion through an inlet. Tensioner mounting device. 2. The automatic tensioner mounting device according to claim 1, wherein the mounting plate portion is formed integrally with the fixed body. 3. The mounting device for an auto tensioner according to claim 1, wherein the mounting plate portion is provided separately from the fixed body. 4. The auto-tensioner mounting device according to claim 2, wherein the engaging portion of the mounting plate portion is engaged when the locking piece of the auto-tensioner is engaged so as to contact the stop portion. An auto-tensioner mounting device, wherein a stopper is pressed against an engagement surface of an engagement portion in a rotation axis direction. 5. The auto-tensioner mounting device according to claim 2, wherein the locking piece of the auto-tensioner is attached to the pulley at the tip of the arm portion of the rotating member in a state where the auto-tensioner is mounted on the fixed body. At two positions on a line substantially parallel to the direction in which the belt reaction force is applied and passing through the rotation axis, and the engaging portion of the mounting plate portion is engaged so that the locking piece contacts the stop portion. An auto-tensioner mounting device characterized in that when engaged, the locking piece is configured to be squeezed and held between both engagement surfaces in the rotation axis direction of the engagement portion. 6. The auto-tensioner mounting device according to claim 2, wherein the locking piece of the auto-tensioner engaged with the engaging portion of the mounting plate portion passes through the inlet and biases the rotation of the rotating member. An attachment device for an auto-tensioner, comprising a retaining means for restricting escape in a direction. 7. The automatic tensioner mounting device according to claim 2, further comprising a stop adjusting means capable of changing a circumferential position of the stop in the engaging portion of the mounting plate. Tensioner mounting device. 8. An auto-tensioner mounting apparatus according to claim 2, wherein said engaging portion adjusting means is capable of changing a circumferential position of said engaging portion in said mounting plate portion around a tensioner mounting center in said mounting plate portion. An auto-tensioner mounting device, characterized in that it is provided. 9. The mounting device for an auto tensioner according to claim 3, wherein the mounting plate has an elongated hole through which a fastening bolt for attaching the mounting plate to the fixed body is inserted. An installation device for an auto-tensioner, which is movable along a surface of a fixed body in a longitudinal direction of an elongated hole when loosened.