Tensioner

Abstract

The utility model provides a tensioner, and belongs to the technical field of automobile accessories. The technical problem that a damping element of an existing tensioner cannot be well attached to a tensioning arm is solved. A tensioner comprises a lower arm, an upper arm and a wheel body, the upper arm is provided with a step-shaped cylindrical wall, the step-shaped cylindrical wall comprises a first transverse wall, a vertical wall and a second transverse wall, a mounting cavity is defined by the first transverse wall, the vertical wall and the lower arm, a spring is arranged in the mounting cavity, a mandrel penetrates through the upper arm and the lower arm, a damping part is embedded between the mandrel and the upper arm in a sleeved mode, and the damping part is arranged in the mounting cavity. A riveting cover is arranged outside the damping piece, the damping piece comprises a first cylinder wall, a circular ring wall and a second cylinder wall, the first cylinder wall is embedded between the first transverse wall and the mandrel, the circular ring wall is fixed between the bottom face of the riveting cover and the vertical wall, and the second cylinder wall is fixed between the peripheral face of the riveting cover and the second transverse arm. The damping piece is good in fitting degree.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile accessories, in particular to a tensioner. Background Art

[0002] The tensioner is used to maintain proper belt tension during actual use, to prevent belt slippage, and to compensate for belt elongation caused by wear and aging. During the operation of the tensioner, the moving belt may cause vibration in the tensioner, resulting in premature wear of the belt and the tensioner. In order to reduce vibration, a damping element needs to be added to the tensioner.

[0003] The existing Chinese patent discloses a wear-resistant automobile tensioner (application number: 2021231451385). The damping structure includes a spiral spring, a base and a damping element. The base is provided with a spring cavity and an axis core. The axis core is located at the center of the spring cavity. A self-lubricating bearing is sleeved on the axis core. The spiral spring is arranged in the spring cavity. One end of the spiral spring is connected to the base and the other end is connected to the tensioning arm. The lower end of the tensioning arm is rotatably arranged on the axis core. A damping element is also embedded in the tensioning arm, and the damping element cooperates with the axis core. Since the damping element is located between the dust cover and one end face of the tensioning arm, if the dust cover is loose or the anti-loosening cover does not fit the damping element well, the damping element will not fit well on the tensioning arm and cannot play a good role in vibration reduction. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a tensioner. The technical problem to be solved by the present invention is: how to improve the fit and vibration reduction effect of the damping member in the tensioner.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a tensioner, comprising a lower arm, an upper arm arranged on the lower arm, and a wheel body rotatably mounted on the upper arm, the upper arm having a stepped cylindrical wall, the stepped cylindrical wall comprising a first transverse wall, a vertical wall and a second transverse wall, the first transverse wall, the vertical wall and the lower arm together form an installation cavity, a spring is arranged in the installation cavity, a core shaft passes through the upper arm and the lower arm, a damping member is embedded between the core shaft and the upper arm, a riveted cover is arranged outside the damping member, the damping member comprises a first cylindrical wall, an annular wall and a second cylindrical wall, the first cylindrical wall is embedded between the first transverse wall and the core shaft, the annular wall is fixed between the bottom surface of the riveted cover and the vertical wall, and the second cylindrical wall is fixed between the outer peripheral surface of the riveted cover and the second transverse arm. In this solution, the contact area between the damping member and the upper arm is increased by fitting the first cylindrical wall, the annular wall and the second cylindrical wall of the damping member with the stepped cylindrical wall of the upper arm, so that the shock absorbing effect of the tensioner is better; under the action of the spring elastic force, the fitting of the first cylindrical wall and the first transverse wall, the fitting of the annular wall and the vertical wall, and the fitting of the second cylindrical wall and the second transverse wall enable the upper arm to play a better damping role, reduce the vibration of the upper arm, absorb the vibration caused by the external moving belt in the upper arm, make the belt fit more closely with the wheel body, and increase the working efficiency of the whole machine.

[0006] Furthermore, the first cylindrical wall and the annular wall are integrally formed, and the second cylindrical wall is an independently formed part. The second cylindrical wall is independently formed into a component separately from the first cylindrical wall and the annular wall, which is convenient for processing and installation, and can also make the fit after installation better; it ensures that the first cylindrical wall can cooperate with the first transverse wall of the upper arm to have a better concentricity fit and a stronger damping feeling; the second cylindrical wall can cooperate with the second transverse wall of the upper arm to have a better concentricity fit and a stronger damping feeling.

[0007] Furthermore, the outer circumference of the riveted cover is inwardly recessed with a plurality of fixing grooves, the inner circumference of the second cylindrical wall is outwardly protruding with a plurality of fixing blocks that cooperate with the fixing grooves, and there is also a gap between the second cylindrical wall and the annular wall after installation. The fixing grooves and the fixing blocks cooperate to better fix the second cylindrical wall on the outer circumference of the riveted cover, and the riveted cover and the second transverse wall are arranged coaxially, so that the concentricity and fit of the second cylindrical wall and the second transverse wall are better, and the damping feeling is stronger; there is also a gap between the second cylindrical wall and the annular wall after installation, so that the second cylindrical wall and the annular wall always maintain a certain gap, so that the concentricity and fit of the second cylindrical wall and the second transverse wall are better.

[0008] Furthermore, the second cylindrical wall is fixed on the outer periphery of the riveted cover by injection molding, so that the second cylindrical wall is better fixed on the outer periphery of the riveted cover, and the concentricity and fit between the second cylindrical wall and the second transverse wall are better, thereby reducing vibration.

[0009] Furthermore, a mounting groove is provided on the vertical wall, the annular wall abuts against the mounting groove, a corrugated gasket is fixed between the riveted cover and the annular wall, and the corrugated gasket presses the annular wall tightly. The corrugated gasket is elastic, and the corrugated gasket cooperates with the mounting groove to tightly fix the annular wall on the vertical wall, and the first cylindrical wall integrally connected with the annular wall is fixed between the core shaft and the first transverse wall, so that the concentricity and fit of the first cylindrical wall and the first transverse wall are better, and vibration is reduced.

[0010] Furthermore, the outer diameter of the first cylindrical wall decreases gradually in the direction away from the annular wall, so as to facilitate installation and fixing.

[0011] Furthermore, the annular wall protrudes a limit block in the direction of the riveted cover, the limit block is close to the first cylindrical wall, the corrugated gasket includes a symmetrical convex arc portion and a concave arc portion that smoothly connects the convex arc portion, the end of the convex arc portion abuts against the annular wall, and the middle of the convex arc portion abuts against the limit block. The shape of the corrugated gasket makes it have a certain elasticity, the middle of the convex arc portion abuts against the limit block and the limit block is also close to the first cylindrical wall, so that the corrugated gasket can better fix the first cylindrical wall in the first transverse wall and the core shaft, and the end of the convex arc portion abuts against the annular wall to prevent the outer circumference of the annular wall from warping up, so that the annular wall fits the vertical wall better.

[0012] Furthermore, the first cylindrical wall, the annular wall and the second cylindrical wall are an integral injection-molded part, which is convenient for processing.

[0013] Furthermore, a corrugated gasket is provided between the riveted cover and the annular wall, a mounting groove is provided on the vertical wall, the annular wall has a step portion cooperating with the mounting groove, the step portion abuts against the mounting groove, a limiting block protrudes from the annular wall toward the riveted cover, the limiting block is close to the first cylindrical wall, a corrugated gasket is fixedly provided between the riveted cover and the annular wall, the corrugated gasket abuts against the limiting block to press the annular wall.

[0014] Furthermore, the riveted cover is fixed to the mandrel by riveting.

[0015] Compared with the prior art, the technical effects of the utility model are as follows: the first cylindrical wall, the annular wall and the second cylindrical wall are fitted with the stepped cylindrical wall of the upper arm, the contact area between the damping element and the upper arm is increased, and the shock absorbing effect of the tensioner is better; under the action of the spring force, the first cylindrical wall and the first transverse wall are fitted, the annular wall and the vertical wall are fitted, and the second cylindrical wall and the second transverse wall are fitted, so that the upper arm plays a better damping role, reduces the vibration of the upper arm, absorbs the vibration of the belt caused by the external movement in the upper arm, makes the belt fit the wheel body higher, and increases the working efficiency of the whole machine. The second cylindrical wall is fixed on the outer peripheral surface of the riveted cover, and the riveted cover is arranged coaxially with the second transverse wall, so that the concentricity fit of the second cylindrical wall and the second transverse wall is better, and the damping feeling is stronger; the first cylindrical wall connected with the annular wall is fixed between the core shaft and the first transverse wall, so that the concentricity fit of the first cylindrical wall and the first transverse wall is better, and the vibration is reduced. The damping element is easy to install and fix. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of an embodiment of the present utility model.

[0017] Figure 2 It is an AA enlarged view of the utility model.

[0018] Figure 3 It is a cross-sectional view of the second embodiment of the present utility model.

[0019] Figure number marking: 1, lower arm; 2, upper arm; 21, first transverse wall; 22, vertical wall; 221, mounting groove; 23, second transverse wall; 3, wheel body; 4, mounting cavity; 5, spring; 6, core shaft; 7, damping member; 71, first cylindrical wall; 72, annular wall; 721, limit block; 73, second cylindrical wall; 731, fixing block; 8, riveted cover; 81, fixing groove; 9, corrugated gasket; 91, convex arc portion; 92, concave arc portion. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0021] Embodiment 1:

[0022] according to Figure 1 and Figure 2As shown, a tensioner comprises a lower arm 1, an upper arm 2 arranged on the lower arm 1, and a wheel body 3 rotatably mounted on the upper arm 2, the upper arm 2 has a stepped cylindrical wall, the stepped cylindrical wall comprises a first transverse wall 21, a vertical wall 22, and a second transverse wall 23, the first transverse wall 21, the vertical wall 22 and the lower arm 1 together form a mounting cavity 4, a spring 5 is arranged in the mounting cavity 4, a mandrel 6 penetrates the upper arm 2 and the lower arm 1, a damping member 7 is inserted between the mandrel 6 and the upper arm 2, and a riveted cover 8 is arranged outside the damping member 7. The riveted cover 8 is sleeved outside the mandrel 6 and fixed by riveting to the mandrel 6. The mandrel 6 is connected to an external component to drive the lower arm 1 to swing, and the wheel body 3 is controlled by the spring 5 to tighten the belt on the external component.

[0023] The damping member 7 includes a first cylindrical wall 71, an annular wall 72 and a second cylindrical wall 73. The first cylindrical wall 71 is embedded between the first transverse wall 21 and the core shaft 6, the annular wall 72 is fixed between the bottom surface of the riveted cover 8 and the vertical wall 22, and the second cylindrical wall 73 is fixed between the outer peripheral surface of the riveted cover 8 and the second transverse arm. The first cylindrical wall 71, the annular wall 72 and the second cylindrical wall 73 of the damping member 7 fit with the stepped cylindrical wall of the upper arm 2, increasing the contact area between the damping member 7 and the upper arm 2, so that the shock absorbing effect of the tensioner is better; under the action of the elastic force of the spring 5, the fit of the first cylindrical wall 71 and the first transverse wall 21, the fit of the annular wall 72 and the vertical wall 22, and the fit of the second cylindrical wall 73 and the second transverse wall 23 make the upper arm 2 play a better damping role, reduce the vibration of the upper arm 2, absorb the vibration caused by the external moving belt in the upper arm 2, make the belt fit more closely with the wheel body 3, and increase the working efficiency of the whole machine.

[0024] It is preferred that the first cylindrical wall 71 and the annular wall 72 are integrally formed parts, and the second cylindrical wall 73 is an independent molded part. The outer circumference of the riveted cover 8 is inwardly recessed with a plurality of fixing grooves 81, and the inner circumference of the second cylindrical wall 73 protrudes outwardly with a plurality of fixing blocks 731 that cooperate with the fixing grooves 81, and the second cylindrical wall 73 is injection molded and fixed on the outer circumference of the riveted cover 8. The riveted cover 8 is coaxially arranged with the second transverse wall 23, and the concentricity and fit of the second cylindrical wall 73 and the second transverse wall 23 after the riveted cover 8 is formed into an integral part are better, and the damping feeling is stronger. There is also a gap between the second cylindrical wall 73 and the annular wall 72 after installation, which can prevent the second cylindrical wall 73 from touching the annular wall 72 when the riveted cover 8 is riveted with the mandrel 6, affecting the fit of the second cylindrical wall 73. The second cylindrical wall 73 is formed separately from the first cylindrical wall 71 and the annular wall 72 as one component, which is convenient for processing and installation, and can also make the fit after installation better. In the direction away from the annular wall 72, the outer diameter of the first cylindrical wall 71 decreases successively. This makes it easy to install and fix the first cylindrical wall 71.

[0025] The vertical wall 22 is provided with a mounting groove 221, and the annular wall 72 abuts against the mounting groove 221. A corrugated gasket 9 is fixed between the riveted cover 8 and the annular wall 72, and the corrugated gasket 9 presses the annular wall 72. The corrugated gasket 9 is elastic, and the corrugated gasket 9 cooperates with the mounting groove 221 to tightly fix the annular wall 72 on the vertical wall 22, and fixes the first cylindrical wall 71 integrally connected with the annular wall 72 between the mandrel 6 and the first transverse wall 21, so that the concentricity fit between the first cylindrical wall 71 and the first transverse wall 21 is better, and vibration is reduced. The annular wall 72 protrudes a limiting block 721 toward the direction of the riveted cover 8, and the limiting block 721 is close to the first cylindrical wall 71. The corrugated gasket 9 includes a symmetrical convex arc portion 91 and a concave arc portion 92 that smoothly connects the convex arc portion 91, and the end of the convex arc portion 91 abuts against the annular wall 72, and the middle of the convex arc portion 91 abuts against the limiting block 721. The shape of the corrugated gasket 9 gives it a certain elasticity. The middle part of the convex arc portion 91 abuts against the limit block 721 and the limit block 721 is also close to the first cylindrical wall 71, so that the corrugated gasket 9 can better fix the first cylindrical wall 71 in the first transverse wall 21 and the core shaft 6. The end of the convex arc portion 91 abuts against the annular wall 72 to prevent the outer periphery of the annular wall 72 from warping up, so that the annular wall 72 fits the vertical wall 22 better.

[0026] Embodiment 2:

[0027] according to Figure 3 As shown, it is different from the above-mentioned embodiment 1, wherein the first cylindrical wall 71, the annular wall 72 and the second cylindrical wall 73 are injection molded integral parts. A corrugated gasket 9 is provided between the riveted cover 8 and the annular wall 72, a mounting groove 221 is provided on the vertical wall 22, the annular wall 72 has a step portion that matches the mounting groove 221, the step portion abuts against the mounting groove 221, the annular wall 72 protrudes a limit block 721 toward the riveted cover 8, the limit block 721 is close to the first cylindrical wall 71, a corrugated gasket 9 is fixedly provided between the riveted cover 8 and the annular wall 72, and the corrugated gasket 9 abuts against the limit block 721 to press the annular wall 72.

[0028] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A tensioner, comprising a lower arm (1), an upper arm (2) arranged on the lower arm (1), and a wheel (3) rotatably mounted on the upper arm (2), characterized in that: The upper arm (2) has a stepped cylindrical wall, the stepped cylindrical wall comprises a first transverse wall (21), a vertical wall (22) and a second transverse wall (23), the first transverse wall (21), the vertical wall (22) and the lower arm (1) together form a mounting cavity (4), a spring (5) is arranged in the mounting cavity (4), a core shaft (6) passes through the upper arm (2) and the lower arm (1), and a damping member (7) is inserted between the core shaft (6) and the upper arm (2) A riveted cover (8) is provided outside the damping member (7), and the damping member (7) includes a first cylindrical wall (71), an annular wall (72) and a second cylindrical wall (73), wherein the first cylindrical wall (71) is embedded between the first transverse wall (21) and the core shaft (6), the annular wall (72) is fixed between the bottom surface of the riveted cover (8) and the vertical wall (22), and the second cylindrical wall (73) is fixed between the outer peripheral surface of the riveted cover (8) and the second transverse wall (23).

2. A tensioner according to claim 1, characterized in that: The first cylindrical wall (71) and the annular wall (72) are integrally formed parts, and the second cylindrical wall (73) is an independently formed part.

3. A tensioner according to claim 2, characterized in that: The outer circumferential surface of the riveted cover (8) is inwardly recessed with a plurality of fixing grooves (81), and the inner circumferential surface of the second cylindrical wall (73) is outwardly protruding with a plurality of fixing blocks (731) that cooperate with the fixing grooves (81), and there is also a gap between the second cylindrical wall (73) and the annular wall (72) after installation.

4. A tensioner according to claim 3, characterized in that: The second cylindrical wall (73) is injection-molded and fixed on the outer periphery of the riveted cover (8).

5. A tensioner according to any one of claims 2 to 4, characterized in that: The vertical wall (22) is provided with a mounting groove (221), the annular wall (72) abuts against the mounting groove (221), a corrugated gasket (9) is fixedly provided between the riveted cover (8) and the annular wall (72), and the corrugated gasket (9) presses tightly against the annular wall (72).

6. A tensioner according to claim 5, characterized in that: The outer diameter of the first cylindrical wall (71) decreases gradually along the direction away from the annular wall (72).

7. A tensioner according to claim 6, characterized in that: The annular wall (72) protrudes a limit block (721) in the direction of the riveted cover (8), and the limit block (721) is close to the first cylindrical wall (71). The corrugated gasket (9) comprises a symmetrical convex arc portion (91) and a concave arc portion (92) smoothly connecting the convex arc portion (91), the end of the convex arc portion (91) abuts against the annular wall (72), and the middle of the convex arc portion (91) abuts against the limit block (721).

8. A tensioner according to claim 1, characterized in that: The first cylindrical wall (71), the annular wall (72) and the second cylindrical wall (73) are an integral injection-molded part.

9. A tensioner according to claim 8, characterized in that: A corrugated gasket (9) is provided between the riveted cover (8) and the annular wall (72); a mounting groove (221) is provided on the vertical wall (22); the annular wall (72) has a step portion that matches the mounting groove (221); the step portion abuts against the mounting groove (221); a limiting block (721) protrudes from the annular wall (72) toward the riveted cover (8); the limiting block (721) is close to the first cylindrical wall (71); a corrugated gasket (9) is fixedly provided between the riveted cover (8) and the annular wall (72); the corrugated gasket (9) abuts against the limiting block (721) to press the annular wall (72).

10. A tensioner according to claim 1, characterized in that: The riveted cover (8) is fixed to the core shaft (6) by riveting.

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