Two-way tensioner with stable damping

Abstract

The utility model relates to a two-way tensioner stable in damping. The two-way tensioner comprises a base, a pivot, a lower lining, a control arm, an upper lining, a flat gasket, a wave spring and an upper cover. A connecting hole is formed in the middle of the base, and the connecting section of the pivot is inserted into the connecting hole; the pivot is sleeved with the lower bush, the end ring of the lower end of the lower bush abuts against the supporting disc, the pivot penetrates through the shaft hole of the control arm and penetrates out of the upper end of the shaft hole, 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 lower portion of the upper bush is the sleeve part, and the end ring is arranged at the upper end of the sleeve part. The pivot is sleeved with the upper bush, the pivot is sequentially sleeved with the flat gasket, the wave spring and the upper cover from bottom to top, and the flat gasket is located above an end ring of the upper bush; a wave-shaped protrusion at the lower end of the wave-shaped spring abuts against the flat gasket, and a wave-shaped protrusion at the upper end of the wave-shaped spring abuts against the upper cover. According to the two-way tensioner, the wave spring is in surface contact with the flat gasket and the upper cover, and damping stability of the two-way tensioner can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of automatic tensioner of automobile engine belt tension adjustment, especially a kind of two-way tensioner of damping stability. BACKGROUND

[0002] The crank pulley of automobile engine drives the pulley rotation of multiple accessories by belt, in order to prevent the slip and shaking of belt, tensioner needs to be set to the belt drive mechanism to automatically tension the belt.

[0003] The existing two-way tensioner of damping stability includes base, pivot, lower bushing, control arm, upper bushing, flat washer, disc spring and upper cover, wherein, the disc spring includes a plurality of concave-convex interval arranged washer, the contact area between such disc spring is very small, and the contact area between disc spring and lower end flat washer and upper end upper cover is very small, only outer peripheral edge part can contact, it is line contact, the friction between such spring washer is small, mainly used to provide axial elastic force, during the operation of engine, relative rotation occurs between disc spring and other contacted parts, thus wear occurs between disc spring and other contacted parts, only when disc spring and other parts, disc spring and disc spring friction is stable, i.e. the contact surface between each other becomes surface contact after friction, relative movement can stop, and damping system can be stable, thus the existing two-way tensioner of damping stability needs to be improved. SUMMARY

[0004] The utility model discloses to the existing two-way tensioner of damping stability in the background art, the disc spring between and the disc spring and other parts between the friction that can occur in the early stage of operation, leading to the problem of unstable damping, provide a kind of two-way tensioner of damping stability.

[0005] To achieve the above object, the utility model is realized by the following technical solutions:

[0006] A two-way tensioner of damping stability, it includes base, pivot, lower bushing, control arm, upper bushing, flat washer, wave spring and upper cover;

[0007] The middle part of base is equipped with connecting hole, the lower end of pivot is equipped with the connecting section corresponding with connecting hole, and the connecting section of pivot is inserted with the connecting hole of base and is connected;

[0008] The lower end of the lower bushing is abutted against the supporting disc, the middle part of the control arm is provided with a shaft hole, the pivot passes through the shaft hole of the control arm and is out of the upper end of the shaft hole, the lower end of the control arm is abutted against the end ring of the lower bushing, and the sleeve part of the lower bushing is located in the shaft hole of the control arm, the lower part of the upper bushing is a sleeve part, the end ring is arranged at the upper end of the sleeve part, the upper bushing is sleeved on the pivot, and the sleeve part of the upper bushing extends into the shaft hole of the control arm;

[0009] The upper part of the control arm is provided with a stepped surface, the radius above the stepped surface is greater than the radius of the shaft hole of the control arm, and the end ring of the upper bushing is abutted against the stepped surface of the control arm;

[0010] The flat pad, the wave spring and the upper cover are sequentially sleeved on the pivot from bottom to top, and the flat pad is located above the end ring of the upper bushing;

[0011] The wave-shaped protrusions on the lower end surface of the wave spring are abutted against the flat pad, the wave-shaped protrusions on the upper end surface of the wave spring are abutted against the inner end surface of the upper cover, and the wave-shaped protrusions between the spring pieces in the middle part of the wave spring are in contact.

[0012] The upper end of the pivot is connected with the upper cover through spin riveting.

[0013] In the above scheme, the base is provided with a cylindrical boss, the connecting hole is arranged in the middle part of the cylindrical boss, and the supporting disc on the pivot is abutted against the cylindrical boss.

[0014] In the above scheme, the sleeve parts of the lower bushing and the upper bushing are all provided with axial long grooves, the end rings of the lower bushing and the upper bushing are all provided with radial grooves, the radial grooves are located in the corresponding positions of the long grooves, the radial grooves are connected with the long grooves, and the radial grooves extend from the inner side of the end ring to the middle part of the end ring.

[0015] The utility model discloses a damping stable bidirectional tensioner, which is provided with a wave spring on a pivot, wave-shaped protrusions of each spring piece in the middle part of the wave spring are in contact, an inner end surface of the wave spring is abutted against an upper end surface of a flat pad, and the wave spring is abutted against the flat pad and an upper cover. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a sectional view of the damping stable bidirectional tensioner.

[0017] Fig. 2The utility model discloses a damping stable bidirectional tensioner's wave spring's structure schematic view.

[0018] Fig. 3 The utility model discloses a damping stable bidirectional tensioner's lower bushing's structure schematic view.

[0019] The figure mark is: base 1, cylindrical boss 11, connecting hole 12, pivot 2, support disc 21, connecting section 22, lower bushing 3, sleeve part 31, end ring 32, long slot 33, radial slot 34, control arm 4, step surface 41, upper bushing 5, flat pad 6, wave spring 7, wave protrusion 71, upper cover 8. DETAILED DESCRIPTION

[0020] The utility model discloses a damping stable bidirectional tensioner's wave spring's structure schematic view.

[0021] As Figs. 1-3 The utility model discloses a damping stable bidirectional tensioner, which comprises a base 1, a pivot 2, a lower bushing 3, a control arm 4, an upper bushing 5, a flat pad 6, a wave spring 7 and an upper cover 8.

[0022] The base 1 is a disc-shaped base, and a connecting hole 12 is arranged in the middle of the base 1 and used for connecting the pivot 2.

[0023] Preferably, a cylindrical boss 11 is arranged on the base 1, the connecting hole 12 is arranged in the middle of the cylindrical boss 11, and the support disc 21 on the pivot 2 is tightly arranged on the cylindrical boss 11.

[0024] The pivot 2 is a cylindrical shaft, a support disc 21 is arranged on the lower part of the pivot 2, a connecting section 22 is arranged below the support disc 21, the pivot 2 is connected to the base 1 through the connecting section 22, and the support disc 21 is attached to the cylindrical boss 11 on the base 1, so that the base 1 can stably support the pivot 2.

[0025] The lower bushing 3 comprises a sleeve part 31 and an end ring 32, the lower bushing 3 is sleeved on the pivot 2, and the end ring 32 of the lower bushing 3 is arranged on the support disc 21 on the pivot 2.

[0026] The control arm 4 is a cylindrical piece, a vertical shaft hole is arranged in the control arm 4, the pivot 2 passes through the shaft hole and is arranged to pass out of the upper end of the shaft hole of the control arm 4, so that the control arm 4 is sleeved on the pivot 2, and a step surface 41 is arranged on the upper part of the control arm 4, and the radius above the step surface 41 is greater than the radius of the shaft hole of the control arm 4.

[0027] The lower end of the control arm 4 is abutted against the end ring 32 of the lower bushing 3, and the sleeve part 31 of the lower bushing 3 is located in the shaft hole of the control arm 4.

[0028] The lower part of the upper bushing 5 is a sleeve part, and an end ring is arranged at the upper end of the sleeve part; the upper bushing 5 is sleeved on the pivot 2, the sleeve part of the upper bushing 5 extends into the shaft hole of the control arm 4, and the end ring is abutted against the stepped surface of the control arm 4.

[0029] The flat pad 6, the wave spring 7 and the upper cover 8 are sequentially sleeved on the pivot 2 from bottom to top, and the flat pad 6 is located above the end ring of the upper bushing 5.

[0030] The wave-shaped protrusions 71 on the lower end surface of the wave spring 7 are abutted against the flat pad 6, the wave-shaped protrusions 71 on the upper end surface of the wave spring 7 are abutted against the inner end surface of the upper cover 8, and the wave-shaped protrusions 71 between the spring leaves in the middle part of the wave spring 7 are in contact.

[0031] The upper end of the pivot 2 extends above the upper cover 8, and the upper end part of the pivot 2 is rivet-connected with the upper cover 8.

[0032] In the above scheme, the sleeve part of the lower bushing 3 and the sleeve part of the upper bushing 5 are both provided with an axial long groove 33, and a radial groove 34 is arranged on the end ring of the lower bushing and the upper bushing, the position of the radial groove 34 corresponds to the long groove 33, the radial groove 34 is connected with the long groove 33, and the radial groove 34 extends from the inner side of the end ring to the middle part of the end ring.

[0033] The damping stable bidirectional tensioner is arranged beside the belt transmission mechanism of the automobile in use, the tensioning wheel for tightening the belt is fixedly connected on the control arm, the upper cover presses the wave spring, the wave spring presses the flat pad, the upper and lower ends of the control arm are pressed by the upper bushing and the lower bushing respectively, and the damping force is formed, and the damping stable bidirectional tensioner can provide bidirectional damping force through the arrangement.

[0034] The damping stable bidirectional tensioner is arranged with the wave spring on the pivot, the wave-shaped protrusions of the spring leaves in the middle part of the wave spring are in contact, the upper end surface of the wave spring is abutted against the inner end surface of the upper cover, and the lower end surface of the wave spring is abutted against the upper end surface of the flat pad, and the spring leaves of the wave spring do not rotate relatively, and the wave spring and the flat pad and the upper cover do not rotate relatively, so that the damping stability of the damping stable bidirectional tensioner is guaranteed.

[0035] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A damped and stable bidirectional tensioner, characterized in that, It includes a base, pivot, lower bushing, control arm, upper bushing, flat pad, wave spring, and upper cover; The base has a connecting hole in the middle, and the lower end of the pivot has a connecting section corresponding to the connecting hole. The connecting section of the pivot is plugged into the connecting hole of the base. A support disk is provided at the lower part of the pivot. The lower bushing is fitted onto the pivot. The end ring at the lower end of the lower bushing rests on the support disk. The middle part of the control arm is provided with a shaft hole. The pivot passes through the shaft hole of the control arm and exits from the upper end of the shaft hole of the control arm. The lower end of the control arm rests on the end ring of the lower bushing. The sleeve part of the lower bushing is located inside the shaft hole of the control arm. The lower part of the upper bushing is a sleeve part. An end ring is provided at the upper end of the sleeve part. The upper bushing is fitted onto the pivot. Its sleeve part extends into the shaft hole of the control arm. A stepped surface is provided on the upper part of the control arm, and the radius above the stepped surface is larger than the radius of the shaft hole of the control arm. The end ring of the upper bushing rests on the stepped surface of the control arm. The flat washer, wave spring, and upper cover are sequentially fitted onto the pivot from bottom to top, with the flat washer positioned above the end ring of the upper bushing. The wave-shaped protrusion on the lower end face of the wave spring is pressed against the flat pad, and the wave-shaped protrusion on the upper end face of the wave spring is pressed against the inner end face of the upper cover. The upper end of the pivot is riveted to the upper cover.

2. The damped and stable bidirectional tensioner according to claim 1, characterized in that: The base is provided with a cylindrical boss, the connecting hole is located in the middle of the cylindrical boss, and the support disk on the pivot is pressed against the cylindrical boss.

3. The damped and stable bidirectional tensioner according to claim 1, characterized in that: Both the lower bushing and the upper bushing have axial long grooves in their sleeve portions. Both the lower bushing and the upper bushing have radial grooves on their end rings. The radial grooves are positioned corresponding to the long grooves and are connected to the long grooves. The radial grooves extend from the inside of the end rings to the middle of the end rings.

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