Run-out damping device for narrowing type tensioning wheel

Abstract

The utility model discloses a narrowing type tensioning wheel jumping damping device. The narrowing type tensioning wheel jumping damping device comprises a shell. A rotary cover is mounted at one end of the spindle; a torsion spring that applies a torque to the rotary cover to rotate in the second rotation direction; the expanding sleeve is in transmission connection with the rotary cover; damping grease capable of generating a viscous damping effect is filled between the inner circumferential surface of the sleeve and the outer circumferential surface of the expanding sleeve; the locking spring spirally extends to the free end from the fixed end in the axis direction of the main shaft, and when the sleeve rotates relative to the shell in the first rotating direction, the free end is forced to rotate in the first rotating direction and the locking spring shrinks in the radial direction under the friction action applied by the sleeve to the locking spring; therefore, the locking spring tightly holds the sleeve and prevents the sleeve from continuously rotating in the first rotating direction. The damping device adopts the radial layout around the main shaft, and the axial size of the main shaft can be designed to be smaller, so that the widths of the damping device and the rear derailleur are reduced, and the risk of mechanical interference or part collision is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bicycle, especially relates to tensioning wheel bounce damping device. BACKGROUND

[0002] The rear derailleur of the variable speed bicycle is the core component of the transmission system, its function is to guide the chain to switch between different freewheel pieces stably through the guide wheel, and to inhibit the chain vibration and maintain the stable tension with the help of the tensioning wheel bounce damping device, wherein the damping device can prevent the tensioning wheel from abnormal bounce when the bicycle is jolted violently, and prevent the chain from falling off.

[0003] At present, the rear derailleur generally has the problem of excessive size in the overall width direction (i.e. perpendicular to the direction of travel of the bicycle), which is mainly caused by the long axial extension of the rotating shaft of the damping device. In order to meet the axial layout of the components inside the damping device, especially the axial arrangement of the tensioning elastic element and the one-way damping structure of the tensioning wheel, the rotating shaft needs to be designed to be relatively long. The excessively wide damping device profile is easy to interfere with the spokes of the rear wheel or the rear fork of the frame, especially when the road surface is bumpy or the steering angle is large, which may cause component collision and even structural damage. Moreover, it also makes the gap between the rear derailleur and the freewheel set smaller, which limits the space for regular maintenance operations such as chain disassembly and guide wheel cleaning. SUMMARY

[0004] The utility model aims at solving one of the technical problems existing in the prior art. To this end, the utility model provides a narrow type tensioning wheel bounce damping device.

[0005] The utility model discloses a narrow type tensioning wheel bounce damping device, with opposite first rotation direction and second rotation direction, including the casing, the casing is from inside to outside along the radial direction and is provided with: the main shaft, rotates the casing along the own axis, one end of the main shaft is installed with the rotary cover, the rotary cover is configured to connect the tensioning wheel, can be actuated along the first rotation direction or the second rotation direction, torsion spring is arranged between the rotary cover and the casing, the torsion spring is configured to the rotary cover is applied along the second rotation direction and rotates the torque of torsion spring, the expansion sleeve is transmission connection with the rotary cover, and the expansion sleeve rotates the casing along the own axis, the sleeve is rotated and is set outside the expansion sleeve, and the inner periphery of sleeve is filled with the damping grease of being able to produce viscous damping effect between the outer periphery of expansion sleeve, locking spring is set outside the sleeve, locking spring has fixed end and free end and is by fixed end and is around the axis direction of main shaft helical extension to free end, the fixed end is installed on the casing, and the free end embraces the outer periphery of sleeve, and the inner diameter of locking spring under the natural state is equal to the outer periphery diameter of sleeve, when the sleeve relatively the casing rotates along the first rotation direction, the sleeve exerts the friction effect to locking spring and forces the free end to rotate along the first rotation direction and makes locking spring contract along the radial direction, so that locking spring embraces tightly sleeve and hinders sleeve and continues to rotate along the first rotation direction.

[0006] The damping device has at least the following advantages: the shell of the damping device is sequentially provided with a main shaft, a torsion spring, a diameter expansion sleeve, a sleeve and a locking spring from inside to outside in the radial direction, the main shaft is connected with a tensioning wheel through a rotating cover, the main shaft becomes the center of oscillation of the tensioning wheel in a first rotation direction or a second rotation direction, the torsion spring can apply a torque in the second rotation direction to the rotating cover, that is, apply a force of the tensioning chain to the tensioning wheel, the torsion spring is sufficient to meet the requirement of tensioning the chain by the tensioning wheel in a normal driving state of the bicycle, the rotating cover is also connected with the diameter expansion sleeve, the outer circumferential surface of the diameter expansion sleeve and the inner circumferential surface of the sleeve are filled with damping grease capable of generating viscous damping effect, the locking spring is sleeved on the sleeve, the locking spring extends from a fixed end to a free end around the axial direction of the main shaft, the fixed end is installed on the shell and the free end embraces the outer circumferential surface of the sleeve, when the bicycle is subjected to severe bumping, if the tensioning wheel has a tendency of instantaneously moving towards the relaxed chain direction, the rotating cover, the main shaft and the diameter expansion sleeve need to be synchronously driven to rotate in the first rotation direction, since the damping grease is subjected to rapid pulling impact and generates large viscous damping effect, the diameter expansion sleeve can drive the sleeve to rotate in the first rotation direction through the damping grease, after a small rotation amplitude, the locking spring can quickly embrace the sleeve to hinder the sleeve from continuously rotating in the first rotation direction, generate large damping, and further hinder the rotating cover from continuously rotating, prevent the chain from falling off, the damping effect is obvious and the reaction is rapid, since the torsion spring, the diameter expansion sleeve, the sleeve and the locking spring are arranged in the radial direction around the main shaft, the axial dimension of the main shaft can be designed to be small, the width of the damping device and the rear derailleur is reduced, a narrowed structure is formed, the risk of mechanical interference or component collision is reduced, and the gap between the rear derailleur and the freewheel set is increased, the space for regular maintenance operations such as chain disassembly and guide wheel cleaning is expanded.

[0007] According to some embodiments of the present application, a limiting pin is detachably mounted on the shell, the main shaft is provided with a limiting groove in the form of a ring in the circumferential direction, and the limiting pin is inserted into the limiting groove to constrain the axial position of the main shaft.

[0008] According to some embodiments of the present application, a first sealing ring is arranged between one end of the diameter expansion sleeve away from the rotating cover and the sleeve, a second sealing ring is arranged between the other end of the diameter expansion sleeve close to the rotating cover and the sleeve, the first sealing ring, the outer circumferential surface of the diameter expansion sleeve, the second sealing ring and the inner circumferential surface of the sleeve form an annular chamber, and the annular chamber is configured to fill the damping grease.

[0009] According to some embodiments of the utility model, the first expansion shoulder towards the sleeve is arranged on the outer circumferential surface of the diameter expansion sleeve away from one end of the rotating cover, the second expansion shoulder towards the diameter expansion sleeve is arranged on the inner circumferential surface of the sleeve close to one end of the rotating cover, and the first expansion shoulder and the second expansion shoulder are both located in the annular chamber.

[0010] According to some embodiments of the utility model, the first sealing groove is arranged on the outer circumferential surface of the diameter expansion sleeve, the second sealing groove is arranged on the inner circumferential surface of the sleeve, and the first sealing ring and the second sealing ring are respectively constrained in the first sealing groove and the second sealing groove.

[0011] According to some embodiments of the utility model, the shell comprises an outer cylinder shell and an end shell, the rotating cover is inserted into one end of the outer cylinder shell, the end shell is connected with the other end of the outer cylinder shell, the locking spring is located between the outer circumferential surface of the sleeve and the inner circumferential surface of the outer cylinder shell, and the wire diameter of the locking spring is smaller than the distance between the outer circumferential surface of the sleeve and the inner circumferential surface of the outer cylinder shell.

[0012] According to some embodiments of the utility model, the main shaft is rotationally connected with the end shell, and the end shell and the rotating cover jointly constrain the axial positions of the diameter expansion sleeve and the sleeve.

[0013] According to some embodiments of the utility model, the fixed end is mounted on the end shell.

[0014] According to some embodiments of the utility model, one end of the main shaft is provided with a first external spline, the rotating cover is provided with a first internal spline, the first external spline is connected with the first internal spline in a matched mode, one end of the main shaft is provided with a threaded hole along the axis of the main shaft, and the threaded hole is fastened with the rotating cover through a fastener.

[0015] According to some embodiments of the utility model, the rotating cover is provided with a second external spline, the diameter expansion sleeve is provided with a second internal spline, and the second external spline is connected with the second internal spline in a matched mode.

[0016] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further explained in combination with the drawings and embodiments, wherein:

[0018] Figure 1 It is the structural schematic diagram of the utility model embodiment;

[0019] Figure 2 It isFigure 1 a sectional view thereof;

[0020] Figure 3 is Figure 2 a partial enlarged view of A in FIG.

[0021] Figure 4 is Figure 2 a partial enlarged view of B in FIG.

[0022] Figure 5 is Figure 1 a schematic exploded view thereof;

[0023] Figure 6 is a schematic exploded view of the expansion sleeve and the sleeve in the embodiment of the utility model;

[0024] Figure 7 is a schematic exploded view of the main shaft, the rotating cover and the expansion sleeve in the embodiment of the utility model.

[0025] The drawing reference: shell 1, outer cylinder shell 101, end shell 102, main shaft 2, limit groove 21, first outer spline 22, threaded hole 23, rotating cover 3, first inner spline 31, second outer spline 32, torsion spring 4, expansion sleeve 5, first expansion shoulder 51, first sealing groove 52, second inner spline 53, sleeve 6, second expansion shoulder 61, second sealing groove 62, locking spring 7, fixed end 71, free end 72, limit pin 8, first sealing ring 9, second sealing ring 10, annular chamber 11. DETAILED DESCRIPTION

[0026] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the orientation description, such as the first rotation direction, the second rotation direction, the radial direction, the axial direction and the like, is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as limiting the utility model.

[0027] In the description of the utility model, if the first and the second are described for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0028] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0029] Refer to Figures 1 to 7The utility model discloses a narrow type tensioning wheel bounce damping device, including the casing 1, the casing 1 is by inside and outside in turn with main shaft 2, torsion spring 4, expansion sleeve 5, sleeve 6 and locking spring 7 of radial direction.

[0030] Wherein, refer to Figure 1 、 Figure 2 And Figure 7 , main shaft 2 around own axis rotation connection casing 1, one end of main shaft 2 is equipped with rotary cover 3, and rotary cover 3 is configured to connect tensioning wheel, and rotary cover 3 can be actuated along the first rotation direction or the second rotation direction, wherein, the first rotation direction and the second rotation direction are opposite, and torsion spring 4 is arranged between rotary cover 3 and casing 1, and torsion spring 4 is configured to apply the torque along the second rotation direction to rotary cover 3, that is, to apply the tensioning chain force to tensioning wheel.

[0031] Refer to Figure 2 、 Figure 6 And Figure 7 , expansion sleeve 5 is transmission connection with rotary cover 3, and expansion sleeve 5 is around own axis rotation connection casing 1, and sleeve 6 is rotationally sleeved in expansion sleeve 5, and the inner periphery of sleeve 6 is filled with damping grease between the outer periphery of expansion sleeve 5, and the damping grease can generate the viscous damping effect when being subjected to the rapid pulling impact, and the viscous damping effect is smaller when being subjected to the slower pulling impact.

[0032] Refer to Figure 2 And Figure 4 , locking spring 7 is sleeved outside sleeve 6, locking spring 7 has fixed end 71 and free end 72 and is spirally extended from fixed end 71 to free end 72 around the axial direction of main shaft 2, fixed end 71 is installed on casing 1, and free end 72 embraces the outer periphery of sleeve 6, and the inner diameter of locking spring 7 in natural state is equal to the outer periphery diameter of sleeve 6, and it needs to be explained that, considering the actual manufacturing precision and consistency of locking spring 7, the inner diameter of at least part of the spiral segment in locking spring 7 does not exceed the outer periphery diameter of sleeve 6 in natural state, so as to maintain the embracing pressure of locking spring 7 to the outer periphery of sleeve 6.

[0033] When sleeve 6 rotates along the first rotation direction relative to casing 1, the frictional effect of sleeve 6 to locking spring 7 forces free end 72 to rotate along the first rotation direction and makes locking spring 7 contract in the radial direction, and the reaction is very rapid, so that locking spring 7 tightly embraces sleeve 6, and the pressure between locking spring 7 and sleeve 6 is significantly increased, and locking spring 7 cannot further contract or rotate in the radial direction due to the obstruction of sleeve 6, and the frictional force of locking spring 7 to sleeve 6 is also significantly increased, so as to hinder sleeve 6 to continue rotating along the first rotation direction, as long as sleeve 6 rotates along the first rotation direction relative to casing 1 by a small angle, locking spring 7 can rapidly react, and realizes the reverse damping effect.

[0034] When the sleeve 6 rotates relative to the housing 1 in the second rotation direction, the frictional effect of the sleeve 6 on the locking spring 7 forces the free end 72 to rotate slightly in the second rotation direction and causes the locking spring 7 to expand radially. The reaction is very rapid, so that the locking spring 7 gradually loosens the outer circumferential surface of the sleeve 6, the pressure between the locking spring 7 and the sleeve 6 is significantly reduced, and the sleeve 6 can rotate smoothly with very little resistance.

[0035] Referring to Figure 1 and Figure 2 When the damping device is applied to the rear derailleur, the main shaft 2 becomes the center of the tensioner wheel swinging in the first rotation direction or the second rotation direction, and the torsion spring 4 can apply a torque to the rotating cover 3 in the second rotation direction, that is, apply a force to the tensioner wheel to tighten the chain. In the normal driving state of the bicycle, the torsion spring 4 is sufficient to meet the needs of the tensioner wheel to tighten the chain.

[0036] When the bicycle experiences severe bumps, if the tensioner wheel has a tendency to move instantaneously and quickly towards the relaxed chain direction, the rotating cover 3, the main shaft 2 and the expansion sleeve 5 need to be driven synchronously to rotate in the first rotation direction quickly. Because the damping grease is subjected to rapid pulling impact, a large viscous damping effect is generated, the expansion sleeve 5 can drive the sleeve 6 to rotate in the first rotation direction through the damping grease. After experiencing a small rotation amplitude, the locking spring 7 can quickly grip the sleeve 6 to hinder the sleeve 6 from continuing to rotate in the first rotation direction, generate a large damping, and further hinder the rotating cover 3 from continuing to rotate, thereby preventing the chain from falling off. The damping effect is obvious and the reaction is rapid.

[0037] If the tensioner wheel has a tendency to move instantaneously and quickly towards the tensioning chain direction, it will drive the sleeve 6 to rotate with the rotating cover 3 in the second rotation direction, and the locking spring 7 will gradually disengage the outer circumferential surface of the sleeve 6, so that the sleeve 6 can rotate smoothly with the rotating cover 3 with very little resistance. The tension of the chain itself will hinder the tensioner wheel from continuing to move, and even more unlikely to cause the chain to fall off.

[0038] When the rear derailleur performs normal gear shifting, the tensioner wheel, the rotating cover 3 and the expansion sleeve 5 rotate synchronously and uniformly in the first rotation direction or the second rotation direction, and the speed is much smaller than when the bicycle encounters bumps. When the damping grease is subjected to a slow pulling impact, a small viscous damping effect is generated, the sleeve 6 hardly rotates with the expansion sleeve 5, and the resistance to the gear shifting operation is small, which does not affect the normal gear shifting of the rear derailleur, thereby achieving the effect of one-way damping.

[0039] Referring to Figure 1 , Figure 2 and Figure 5Since the torsion spring 4, the expanding sleeve 5, the sleeve 6 and the locking spring 7 adopt the radial layout around the main shaft 2, the axial dimension of the main shaft 2 can be designed to be smaller, so that the width of the damping device and the rear derailleur is reduced, a narrowed structure is formed, the risk of mechanical interference or component collision is reduced, and the gap between the rear derailleur and the freewheel set is increased, and the space for regular maintenance operations such as chain disassembly and pulley cleaning is expanded.

[0040] In some embodiments of the utility model, referring to Figure 2 、 Figure 5 and Figure 7 , the housing 1 is detachably mounted with a limiting pin 8, the main shaft 2 is circumferentially provided with an annular limiting groove 21, and the limiting pin 8 is inserted into the limiting groove 21 to constrain the axial position of the main shaft 2, specifically, the main shaft 2 can be inserted into the housing 1 first, and then the limiting pin 8 is inserted to constrain the axial position of the main shaft 2, so that the finally assembled main shaft 2 and rotating cover 3 cannot be offset along the axial direction of the main shaft 2.

[0041] Among them, the limiting pin 8 can be inserted into the housing 1 along the axial direction perpendicular to the main shaft 2, and be fastened with the housing 1 through threads to realize detachable connection.

[0042] In some embodiments, referring to Figure 2 and Figure 6 , the first sealing ring 9 is arranged between the end of the expanding sleeve 5 away from the rotating cover 3 and the sleeve 6, the second sealing ring 10 is arranged between the end of the expanding sleeve 5 close to the rotating cover 3 and the sleeve 6, the first sealing ring 9, the outer circumferential surface of the expanding sleeve 5, the second sealing ring 10 and the inner circumferential surface of the sleeve 6 are surrounded to form an annular chamber 11, and the annular chamber 11 is configured to be filled with damping grease, so as to realize sealing of the damping grease.

[0043] In some embodiments, referring to Figure 2 and Figure 3 , the first capacity expansion shoulder 51 is arranged on the outer circumferential surface of the expanding sleeve 5 and protrudes circumferentially towards the sleeve 6, referring to Figure 2 and Figure 4 , the second capacity expansion shoulder 61 is arranged on the inner circumferential surface of the sleeve 6 and protrudes circumferentially towards the expanding sleeve 5, the protruding height of the second capacity expansion shoulder 61 can be consistent with the protruding height of the first capacity expansion shoulder 51, and the first capacity expansion shoulder 51 and the second capacity expansion shoulder 61 are both located in the annular chamber 11, so as to guarantee the minimum radial thickness of the annular chamber 11, and the damping grease distributed between the outer circumferential surface of the expanding sleeve 5 and the inner circumferential surface of the sleeve 6 is relatively uniform, and the damping effect is improved.

[0044] Referring to Figure 3 and Figure 4The outer circumferential surface of the expanding sleeve 5 can be provided with a first sealing groove 52 in the circumferential direction, the inner circumferential surface of the sleeve 6 can be provided with a second sealing groove 62 in the circumferential direction, and the first sealing ring 9 and the second sealing ring 10 are respectively constrained in the first sealing groove 52 and the second sealing groove 62, which can effectively prevent the first sealing ring 9 and the second sealing ring 10 from slipping and deviating, and achieve good sealing of the annular chamber 11.

[0045] In some embodiments, referring to Figure 1 , Figure 2 and Figure 5 , the shell 1 includes an outer cylinder shell 101 and an end shell 102, the outer cylinder shell 101 is cylindrical, the inner circumferential surface of the outer cylinder shell 101 is cylindrical, the rotating cover 3 is inserted into one end of the outer cylinder shell 101, the end shell 102 is connected to the other end of the outer cylinder shell 101, the locking spring 7 is located between the outer circumferential surface of the sleeve 6 and the inner circumferential surface of the outer cylinder shell 101, the diameter of the locking spring 7 is smaller than the distance between the outer circumferential surface of the sleeve 6 and the inner circumferential surface of the outer cylinder shell 101, which ensures that the locking spring 7 has sufficient radial expansion space when it is separated from the outer circumferential surface of the sleeve 6.

[0046] Referring to Figure 2 , the main shaft 2 can be rotationally connected to the end shell 102, the fixed end 71 is installed on the end shell 102, and the end shell 102 and the rotating cover 3 jointly constrain the axial positions of the expanding sleeve 5 and the sleeve 6 to prevent the expanding sleeve 5 and the sleeve 6 from deviating along the axial direction of the main shaft 2.

[0047] In some embodiments, referring to Figure 1 and Figure 7 , one end of the main shaft 2 is provided with a first outer spline 22, the rotating cover 3 is provided with a first inner spline 31, the first outer spline 22 is connected to the first inner spline 31, one end of the main shaft 2 is provided with a threaded hole 23 along the axial direction of the main shaft 2, and the threaded hole 23 is fastened to the rotating cover 3 by a fastener, which realizes the axial fixation of the main shaft 2 and the rotating cover 3, and facilitates the assembly between the main shaft 2 and the rotating cover 3.

[0048] Referring to Figure 7 , the rotating cover 3 can be provided with a second outer spline 32, and the expanding sleeve 5 can be provided with a second inner spline 53, the second outer spline 32 is connected to the second inner spline 53, and the rotating cover 3 transmits rotary power to the expanding sleeve 5 through the second outer spline 32, which facilitates the assembly between the expanding sleeve 5 and the rotating cover 3.

[0049] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0050] Of course, the utility model is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the application.

Claims

1. A tightener hop damping device of the constricting type, having a first direction of rotation and a second direction of rotation opposite to each other, comprising a housing, characterized in that, The shell is sequentially provided with, from inside to outside in the radial direction: a main shaft, which is rotationally connected to the shell around its own axis, one end of the main shaft being provided with a rotating cover configured to be connected to a tensioning wheel and being able to be actuated in a first rotation direction or a second rotation direction; a torsion spring, which is provided between the rotating cover and the shell, the torsion spring being configured to apply a torque in the second rotation direction to the rotating cover; a diameter expansion sleeve, which is in transmission connection with the rotating cover, the diameter expansion sleeve being rotationally connected to the shell around its own axis; a sleeve, which is rotationally sleeved outside the diameter expansion sleeve, the inner circumferential surface of the sleeve being filled with damping grease capable of generating viscous damping action with the outer circumferential surface of the diameter expansion sleeve; a locking spring, which is sleeved outside the sleeve, the locking spring having a fixed end and a free end and being helically extended around the axial direction of the main shaft from the fixed end to the free end, the fixed end being mounted on the shell, the free end embracing the outer circumferential surface of the sleeve, the inner diameter of the locking spring in a natural state being equal to the diameter of the outer circumferential surface of the sleeve, when the sleeve is rotated relative to the shell in the first rotation direction, the frictional action exerted by the sleeve on the locking spring forces the free end to rotate in the first rotation direction and makes the locking spring contract in the radial direction, so that the locking spring tightly embraces the sleeve and hinders the sleeve from continuously rotating in the first rotation direction.

2. The tight side tensioner run-out damper device of claim 1, wherein, A limiting pin is detachably mounted on the shell, the main shaft is provided with a limiting groove in the form of a ring in the circumferential direction, and the limiting pin is inserted into the limiting groove to constrain the axial position of the main shaft.

3. The pinch tightener hop variation damping device of claim 1 wherein, A first sealing ring is provided between one end of the diameter expansion sleeve away from the rotating cover and the sleeve, a second sealing ring is provided between the other end of the diameter expansion sleeve close to the rotating cover and the sleeve, the first sealing ring, the outer circumferential surface of the diameter expansion sleeve, the second sealing ring and the inner circumferential surface of the sleeve form an annular chamber, and the annular chamber is configured to be filled with the damping grease.

4. The pinch tightener hop variation damping device of claim 3, wherein, A first capacity expansion shoulder facing the sleeve is provided on one end of the outer circumferential surface of the diameter expansion sleeve away from the rotating cover in the circumferential direction, and a second capacity expansion shoulder facing the diameter expansion sleeve is provided on one end of the inner circumferential surface of the sleeve close to the rotating cover in the circumferential direction, the first capacity expansion shoulder and the second capacity expansion shoulder being located in the annular chamber.

5. The pinch tightener hop variation damping device of claim 4, wherein, The outer circumferential surface of the diameter expansion sleeve is provided with a first sealing groove in the circumferential direction, and the inner circumferential surface of the sleeve is provided with a second sealing groove in the circumferential direction, the first sealing ring and the second sealing ring being constrained in the first sealing groove and the second sealing groove, respectively.

6. The pinch tightener hop variation damping device of claim 1, wherein, The shell comprises an outer cylinder shell and an end shell, the rotating cover is inserted into one end of the outer cylinder shell, the end shell is connected to the other end of the outer cylinder shell, the locking spring is located between the outer circumferential surface of the sleeve and the inner circumferential surface of the outer cylinder shell, and the wire diameter of the locking spring is smaller than the distance between the outer circumferential surface of the sleeve and the inner circumferential surface of the outer cylinder shell.

7. The pinch tightener hop variation damping device of claim 6, wherein, The main shaft is rotationally connected to the end shell, and the end shell and the rotating cover jointly constrain the axial positions of the diameter expansion sleeve and the sleeve.

8. The pinch tightener hop variation damping device of claim 6, wherein, The fixed end is mounted on the end shell.

9. The pinch tightener hop variation damping device of claim 1 wherein, One end of the main shaft is provided with a first external spline, the rotating cover is provided with a first internal spline, the first external spline is connected with the first internal spline in a matched mode, one end of the main shaft is provided with a threaded hole along the axis of the main shaft, and the threaded hole is fastened with the rotating cover through a fastener.

10. The pinch tightener hop variation damping device of claim 9, wherein, The rotating cover is provided with a second external spline, the diameter expansion sleeve is provided with a second internal spline, and the second external spline is connected with the second internal spline in a matched mode.

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