Bidirectional tensioner

Abstract

The utility model relates to a two-way tensioner which is used for solving the problem that damping force of the tensioner fluctuates in the early stage of starting of an engine. The device comprises a base, a pivot, a lower bushing, a control arm, an upper bushing, a flat gasket, a spring disc and an upper cover, the lower end of the pivot is fixedly connected with the base, a supporting disc is arranged on the lower portion of the pivot, the pivot is sleeved with the lower bushing, an end ring of the lower bushing abuts against the supporting disc, a shaft hole is formed in the middle of the control arm, and the pivot penetrates through the shaft hole of the control arm. The pivot is sleeved with the upper bush and penetrates out of the upper end of the shaft hole of the control arm, the lower end of the control arm abuts against the end ring of the lower bush, the sleeve part of the lower bush is located in the shaft hole of the control arm, the pivot is sleeved with the upper bush, the sleeve part of the upper bush extends into the shaft hole of the control arm, and the end ring abuts against the step face of the control arm. The flat gasket, the spring disc and the upper cover are sequentially connected to the pivot in a sleeved mode from bottom to top and form circumferential positioning with the pivot, and a spin riveting part is arranged at the upper end of the pivot and limits the upper cover.

Description

Technical Field

[0001] The utility model relates to the field of automatic tensioners for adjusting the tension of automobile engine belts, in particular to a bidirectional tensioner. Background Art

[0002] The crankshaft pulley of the automobile engine drives the pulleys of multiple accessories to rotate through a belt. In order to prevent the belt from slipping and shaking, a tensioner needs to be installed next to the belt transmission mechanism to automatically tighten the belt.

[0003] In the early stage of operation, the damping provided by the existing bidirectional tensioner will experience large fluctuations or even jumps. The damping characteristics of these fluctuations and jumps will have adverse effects on the belt system, such as belt shaking and belt slippage, and therefore need to be improved. Utility Model Content

[0004] The utility model aims to provide a bidirectional tensioner in view of the problem that the damping of the existing bidirectional tensioner described in the background technology has large fluctuations or even jumps in the early stage of operation.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A two-way tensioner comprises a base, a pivot, a lower bushing, a control arm, an upper bushing, a flat washer, a spring disc and an upper cover, wherein the lower end of the pivot is fixedly connected to the base, a supporting disc is provided at the lower part of the pivot, the lower bushing is sleeved on the pivot, the upper part of the lower bushing is a sleeve part, an end ring is provided at the lower end part of the sleeve part, the end ring of the lower bushing is pressed against the supporting disc, an axial hole is provided in the middle part of the control arm, the pivot passes through the axial hole of the control arm and passes out from the upper end of the axial hole of the control arm, the lower end of the control arm is pressed against the end ring of the lower bushing, and the sleeve part of the lower bushing is located in the axial hole of the control arm, the upper bushing The lower part is a sleeve part, and an end ring is provided at the upper end part of the sleeve part. The upper bushing is sleeved on the pivot, and its sleeve part extends into the axial hole of the control arm. A step surface is provided on the upper part of the control arm, and the radius above the step surface is larger than the radius of the axial hole of the control arm, and the end ring of the upper bushing is on the step surface of the control arm; the flat washer, spring disc and upper cover are sleeved on the pivot from bottom to top in sequence, and the flat washer is located above the end ring of the upper bushing. The holes through which the flat washer, spring disc and upper cover are sleeved with the pivot form circumferential positioning with the pivot, and a rivet part is provided at the upper end part of the pivot, which forms a limit for the upper cover.

[0007] In the above scheme, a connecting hole is provided in the middle of the base, a connecting section corresponding to the connecting hole is provided at the lower end of the pivot, and the connecting section of the pivot is fixedly connected to the connecting hole of the base.

[0008] In the above scheme, the base is provided with a cylindrical boss, the connecting hole is provided in the middle of the boss, and the support disc on the pivot is tightly pressed against the cylindrical boss. By providing the cylindrical boss, the support force of the base on the support disc on the pivot can be more stable.

[0009] In the above scheme, the sleeve parts of the lower bushing and the upper bushing are provided with axial long grooves, and the end rings of the lower bushing and the upper bushing are provided with radial grooves, the positions of the radial grooves correspond to the long grooves, and the radial grooves are connected to the long grooves, and the radial grooves extend from the inner side of the end ring to the middle of the end ring. By providing the long grooves and radial grooves on the lower bushing and the upper bushing, the friction between the lower bushing and the upper bushing and the pivot can be reduced, and the sleeve connection between the lower bushing and the upper bushing and the pivot is facilitated.

[0010] In the above scheme, the holes for the flat washer, spring disc and upper cover to be sleeved with the pivot are all square holes, and the pivot is provided with a circumferential positioning surface corresponding to the square hole. This arrangement can ensure the circumferential positioning of the flat washer, spring disc and upper cover with the pivot.

[0011] The utility model has positive effects: the bidirectional tensioner of the utility model can provide bidirectional damping force through the control arm, and at the same time, because the hole through which the flat washer, the spring disc and the upper cover are sleeved with the pivot shaft forms a circumferential positioning with the pivot shaft, the flat washer, the spring disc and the upper cover and the pivot shaft cannot perform circumferential relative rotation, so that in the early stage of the operation of the automobile engine, the pressure of the spring disc on the end ring of the upper bushing through the flat washer can be ensured to be stable, so that the damping force between the control arm and the upper bushing and the lower bushing is stable, thereby ensuring the stability of the damping force output by the bidirectional tensioner through the control arm, effectively preventing large fluctuations or even jumps, and effectively avoiding shaking and slipping of the belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the assembly structure of the bidirectional tensioner of the utility model.

[0013] Figure 2 It is an exploded schematic diagram of the bidirectional tensioner of the utility model.

[0014] The reference numerals in the figure are: base 1, cylindrical boss 11, connecting hole 12, pivot 2, connecting section 21, supporting disc 22, positioning surface 23, riveted portion 24, lower bushing 3, sleeve portion 31, end ring 32, long groove 33, radial groove 34, control arm 4, shaft hole 41, step surface 42, upper bushing 5, flat washer 6, square hole 61, spring disc 7, upper cover 8. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is described clearly and completely below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1 and 2 A bidirectional tensioner is shown, which includes a base 1, a pivot 2, a lower bushing 3, a control arm 4, an upper bushing 5, a flat washer 6, a spring disc 7 and an upper cover 8.

[0017] The base 1 is a disc-shaped base, a cylindrical boss 11 is provided in the middle of the base 1 , and a connecting hole 12 is provided in the middle of the cylindrical boss 11 .

[0018] The pivot 2 is a cylindrical shaft. A connecting section 21 corresponding to the connecting hole 12 on the base 1 is provided at the lower end of the pivot 2. The connecting section 21 of the pivot 2 is fixedly connected to the connecting hole 12 on the base 1. A supporting disc 22 is provided at the lower part of the pivot 2. The supporting disc 22 is tightly pressed against the cylindrical boss 11 on the base 1. A structure for circumferentially limiting the flat washer 6, the spring disc 7 and the upper cover 8 is provided at the upper part of the pivot 2. The circumferential limiting method can be selected according to needs, such as the attached Figure 2 As shown, at the upper part of the pivot 2 , a plurality of positioning surfaces 23 are provided on the outer wall of the pivot 2 . Preferably, four positioning surfaces 23 are distributed along the circumference of the outer wall of the pivot 2 .

[0019] The upper part of the lower bushing 3 is a sleeve part 31, and an end ring 32 is provided at the lower end of the sleeve part 31. The sleeve part 31 is provided with an axial long groove 33, and a radial groove 34 is provided on the end ring 32 of the lower bushing 3. The position of the radial groove 34 corresponds to the long groove 33, and the radial groove 34 is connected to the long groove 33. The radial groove 34 extends from the inner side of the end ring 32 to the middle of the end ring 32. The lower bushing 3 is sleeved on the pivot 2, and the end ring 32 of the lower bushing 3 is pressed against the support disc 22.

[0020] The structure of the upper bushing 5 is the same as that of the lower bushing, but the setting direction is opposite. The upper end of the upper bushing 5 is an end ring, and the lower part is a sleeve part.

[0021] The control arm 4 includes an upper cylindrical portion and a lower cylindrical portion, which are integrally formed. The diameter of the upper cylindrical portion is larger than the diameter of the lower cylindrical portion. An axial hole 41 is provided in the middle of the control arm 4, and a step surface 42 is provided in the upper cylindrical portion. The inner diameter above the step surface 42 is larger than the diameter of the axial hole 41.

[0022] The pivot 2 passes through the shaft hole 41 of the control arm 4 , the upper end of the pivot 2 passes through the upper end of the shaft hole 41 of the control arm 4 , the sleeve portion of the lower bushing 3 passes through the shaft hole of the control arm 4 , and the lower end of the control arm 4 rests on the end ring 32 of the lower bushing 3 .

[0023] The upper bushing 5 is sleeved on the pivot 2 , and the sleeve portion thereof extends into the shaft hole of the control arm 4 . The end ring of the upper bushing 5 rests on the step surface 42 of the control arm 4 .

[0024] The flat pad 6 is a gasket with a certain strength, and a through hole is provided in the middle of the flat pad 6. The flat pad is sleeved on the pivot 2 and is located above the upper bushing 5. The shape of the through hole corresponds to the shape of the position where the positioning surface 23 is set on the upper part of the pivot 2, and the through hole can be set as a square hole 61.

[0025] The number of spring discs 7 can be set as needed, for example, three spring discs are set. A through hole is provided in the middle of the spring disc 7, and the spring disc 77 is sleeved on the pivot 2 and located above the flat pad 6. The shape of the through hole corresponds to the shape of the position where the positioning surface 23 is set on the upper part of the pivot 2, and the through hole can be set as a square or round hole.

[0026] A through hole is provided in the middle of the upper cover 8, which is sleeved on the pivot 2 and located above the spring disc 7. The shape of the through hole corresponds to the shape of the position where the positioning surface 23 is set on the upper part of the pivot 2, and the through hole can be set as a square or round hole.

[0027] A rivet portion 24 is provided at the upper end of the pivot 2 , and the rivet portion 24 limits the upper cover 8 .

[0028] The bidirectional tensioner of the utility model is arranged beside the belt transmission mechanism of the automobile when in use, and the tensioning wheel for tightening the belt is fixedly connected to the control arm. In the bidirectional tensioner, the upper cover presses the spring disc, and the spring disc presses the flat pad, so that the upper and lower ends of the control arm are respectively pressed against the upper bushing and the lower bushing to form a damping force. Through this arrangement, the bidirectional tensioner can provide a bidirectional damping force.

[0029] In the bidirectional tensioner of the utility model, a plurality of positioning surfaces are arranged on the upper outer side wall of the pivot, and correspondingly, the through holes on the flat washer, the spring disc and the upper cover are all arranged as square holes, which cooperate with the positioning surfaces to form circumferential limit. Through this arrangement, in the early stage of the operation of the automobile engine, relative rotation will not occur between the pivot and the flat washer, the spring disc and the upper cover, so that the pressure on the end ring of the upper bushing of the spring disc through the flat washer is guaranteed to be stable, thereby making the damping provided by the tensioner more stable, preventing the fluctuation of the damping force provided by the tensioner, making the engine belt transmission system of the automobile more stable, and preventing the shaking and slipping of the belt.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional tensioner, characterized in that: It includes a base, a pivot, a lower bushing, a control arm, an upper bushing, a flat washer, a spring disc and an upper cover. The lower end of the pivot is fixedly connected to the base, a supporting disc is provided at the lower part of the pivot, the lower bushing is sleeved on the pivot, the upper part of the lower bushing is a sleeve part, an end ring is provided at the lower end of the sleeve part, the end ring of the lower bushing is pressed against the supporting disc, an axial hole is provided in the middle part of the control arm, the pivot passes through the axial hole of the control arm and passes through the upper end of the axial hole of the control arm, the lower end of the control arm is pressed against the end ring of the lower bushing, and the sleeve part of the lower bushing is located in the axial hole of the control arm, and the lower part of the upper bushing is A sleeve portion, an end ring is provided at the upper end portion of the sleeve portion, the upper bushing is sleeved on the pivot, the sleeve portion extends into the axial hole of the control arm, a step surface is provided at the upper portion of the control arm, the radius above the step surface is larger than the radius of the axial hole of the control arm, and the end ring of the upper bushing is pressed against the step surface of the control arm; the flat washer, spring disc and upper cover are sleeved on the pivot in sequence from bottom to top, the flat washer is located above the end ring of the upper bushing, the holes through which the flat washer, spring disc and upper cover are sleeved with the pivot form circumferential positioning with the pivot, a rivet portion is provided at the upper end portion of the pivot, the rivet portion forms a limit for the upper cover.

2. The bidirectional tensioner according to claim 1, characterized in that: A connecting hole is arranged in the middle of the base, a connecting section corresponding to the connecting hole is arranged at the lower end of the pivot, and the connecting section of the pivot is fixedly connected to the connecting hole of the base.

3. The bidirectional tensioner according to claim 2, characterized in that: A cylindrical boss is provided on the base, the connecting hole is arranged in the middle of the boss, and the supporting disc on the pivot is tightly pressed against the cylindrical boss.

4. The bidirectional tensioner according to claim 1, characterized in that: The sleeve parts of the lower bushing and the upper bushing are both provided with axial long grooves, and the end rings of the lower bushing and the upper bushing are both provided with radial grooves, the positions of the radial grooves correspond to the long grooves, and the radial grooves are connected to the long grooves, and the radial grooves extend from the inner side of the end ring to the middle of the end ring.

5. The bidirectional tensioner according to claim 4, characterized in that: The holes through which the flat washer, the spring disc and the upper cover are sleeved with the pivot are all square holes, and a circumferential positioning surface corresponding to the square holes is provided on the pivot.

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