A derailleur and a bicycle with damping function

Abstract

An embodiment of the present invention discloses a derailleur with a damping function and a bicycle. The derailleur with a damping function includes a derailleur body, and the derailleur body includes a P joint seat and a chain guiding member. The chain guiding member includes a chain guiding plate, a main shaft, and a reset member. Among them, a cut-off piece is fixedly arranged in a sealed inner cavity; a damping piece for dividing the gap between the sealed inner cavity and the main shaft into a first flow cavity and a second flow cavity is fixedly arranged on the main shaft. Among them, damping liquid is contained in both the first flow cavity and the second flow cavity; a damping member is arranged on the damping piece for preventing the damping liquid in the first flow cavity from entering the second flow cavity when the chain guiding member rotates in a first direction, and for allowing the damping liquid in the second flow cavity to enter the first flow cavity when the chain guiding member rotates in a second direction. The embodiment of the present invention realizes the purpose of achieving a one-way damping function through the cooperation of the damping member and the damping liquid, and effectively improves the service life of the damping function.

Description

Technical Field

[0001] The present invention relates to the field of bicycle speed changing devices, in particular to a rear derailleur with a damping function and a bicycle. Background Art

[0002] Currently, the rear derailleur is an important component of the speed change system on a variable-speed bicycle. It is responsible for shifting the chain on different flywheels to cope with different road conditions, allowing the rider to use his body more reasonably to drive the bicycle forward.

[0003] However, when riding a bicycle, for example, on bumpy roads, the inertia of the bumps and vibrations will cause the chain guide member and the connecting seat to rotate accordingly, thereby causing the chain to slack and cause the chain to fall off. The prior art solves the above problem by adding a one-way damping structure to the rear derailleur. Since the one-way damping structure generally includes a one-way bearing and one or more friction plates or friction blocks that generate friction with the rotation of the one-way bearing, this one-way damping structure is prone to wear after long-term use, resulting in the failure of the one-way damping function. Summary of the Invention

[0004] The present invention aims to provide a rear derailleur and a bicycle with a damping function, aiming to solve the problem that the one-way damping structure on the existing rear derailleur is prone to failure of the one-way damping function after long-term use.

[0005] To solve the above technical problems, the object of the present invention is achieved through the following technical solutions: providing a rear derailleur with a damping function, comprising a rear derailleur body, the rear derailleur body comprising a P joint seat and a chain guide member rotatably connected to each other, the chain guide member comprising a chain guide plate rotatably connected to one end of the P joint seat, a spindle having one end fixed to one end of the chain guide plate, a reset member having one end fixedly connected to the chain guide plate and the other end rotatably connected to the P joint seat, the other end of the spindle extending into the enclosed inner cavity of the P joint seat, wherein:

[0006] The sealed inner cavity is fixed with a truncation piece pressed against the outer peripheral side of the main shaft, and the truncation piece is extended along the rotation axis of the sealed inner cavity;

[0007] A damping plate is fixedly provided on the main shaft for dividing the gap between the sealed inner cavity and the main shaft into a first flow cavity and a second flow cavity, wherein the first flow cavity and the second flow cavity both contain damping liquid;

[0008] A damping component is provided on the damping plate, and the damping component is used to prevent the damping liquid in the first flow chamber from entering the second flow chamber when the chain guide member rotates along the first direction, and to allow the damping liquid in the first flow chamber to enter the second flow chamber when the chain guide member rotates along the second direction, wherein the rotation directions of the first direction and the second direction are opposite.

[0009] Furthermore, at least one deformable body is placed in the first flow cavity and / or the second flow cavity.

[0010] Furthermore, the inner side wall of the sealed inner cavity is provided with at least one reflux groove for connecting the first flow cavity and the second flow cavity, and the groove depth of the reflux groove gradually increases from the second flow cavity to the first flow cavity.

[0011] Furthermore, the damping plate is provided with at least one flowable hole penetrating the first flow cavity and the second flow cavity, the damping components are provided in one-to-one correspondence with the flowable holes, and each of the damping components comprises:

[0012] An elastic sheet, one end of which is fixed on one side of the damping sheet, and the other end of which closes the opening of the flow hole when the chain guide member rotates along the first direction, opens the opening of the flow hole when the chain guide member rotates along the second direction, and re-closes the opening of the flow hole after the reset member is reset.

[0013] Furthermore, the damping component also includes an abutment column arranged on the elastic sheet, and one end of the abutment column abuts against the opening of the flow hole.

[0014] Furthermore, the elastic sheet includes a first connecting part, a second connecting part and a third connecting part connected in sequence, the first connecting part and the third connecting part are respectively fixed at both ends of the second connecting part, and the first connecting part and the third connecting part are respectively located on opposite sides of the second connecting part, wherein the abutting column is fixedly connected to the third connecting part, and the first connecting part is fixed on the damping sheet.

[0015] Furthermore, the third connecting portion is provided with a mounting hole, and the abutting column includes:

[0016] an abutting portion, the abutting portion being located between the third connecting portion and the damping plate and configured to abut against the opening of the flowable hole;

[0017] a sliding portion, the sliding portion being slidably connected to the mounting hole;

[0018] a limiting portion, the limiting portion being located on a side of the third connecting portion facing away from the damping plate;

[0019] Wherein, the end areas of the opposite ends of the abutting portion and the limiting portion are both larger than the cross-sectional area of the sliding portion.

[0020] Further, a communication hole penetrating through the first flow cavity and the second flow cavity is provided on the truncation piece, and an opening and closing member for opening and closing the communication hole is provided on the P joint seat.

[0021] Further, the opening and closing member includes:

[0022] A one-way column, the one-way column is rotatably connected to the communication hole, and the one-way column is provided with a relief hole penetrating through both sides thereof;

[0023] A connecting column, the connecting column is threadedly connected to the P joint seat, and one end thereof is fixed to one end of the one-way column and the other end extends out of the outside of the P joint seat;

[0024] A rotating block, one end of the rotating block is fixed to the other end of the connecting column.

[0025] An embodiment of the present invention also provides a bicycle, including a bicycle body and the derailleur with damping function as described above, and the derailleur with damping function is installed on the bicycle body.

[0026] An embodiment of the present invention provides a derailleur with damping function and a bicycle, wherein: the derailleur with damping function includes a derailleur body, the derailleur body includes a P joint seat and a chain guiding member that are rotatably connected to each other, the chain guiding member includes a chain guiding plate rotatably connected to one end of the P joint seat, a main shaft with one end fixed to one end of the chain guiding plate, and a reset member with one end fixedly connected to the chain guiding plate and the other end rotatably connected to the P joint seat. The other end of the main shaft extends into the sealed inner cavity of the P joint seat. Wherein, a truncation piece tightly abutted against the outer peripheral side of the main shaft is fixedly arranged in the sealed inner cavity, and the truncation piece extends along the rotation axis of the sealed inner cavity; a damping piece for dividing the gap between the sealed inner cavity and the main shaft into a first flow cavity and a second flow cavity is fixedly arranged on the main shaft. Wherein, damping liquid is accommodated in both the first flow cavity and the second flow cavity; a damping member is arranged on the damping piece, and the damping member is used for preventing the damping liquid in the first flow cavity from entering the second flow cavity when the chain guiding member rotates in the first direction, and for allowing the damping liquid in the second flow cavity to enter the first flow cavity when the chain guiding member rotates in the second direction, wherein the rotation directions of the first direction and the second direction are opposite. The embodiment of the present invention realizes the purpose of the one-way damping function of the derailleur by the combined use of the damping member and the damping liquid, and has a long service life. Description of the Drawings

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Structural schematic diagram of a rear derailleur with a damping function provided by an embodiment of the present invention;

[0029] Figure 2 Partial structural schematic diagram of a sealed inner cavity in a rear derailleur with a damping function provided by an embodiment of the present invention;

[0030] Figure 3 Partial cross-sectional view of a rear derailleur with a damping function provided by an embodiment of the present invention;

[0031] Figure 4 Structural schematic diagram of a return groove in a rear derailleur with a damping function provided by an embodiment of the present invention;

[0032] Figure 5 Partial structural schematic diagram of a damping sheet in a rear derailleur with a damping function provided by an embodiment of the present invention;

[0033] Figure 6 Partial structural schematic diagram of an opening and closing member and a damping member in a rear derailleur with a damping function provided by an embodiment of the present invention.

[0034] Explanation of the markings in the figure:

[0035] 1. P joint seat; 11. Sealed inner cavity; 12. First flow cavity; 13. Second flow cavity; 14. Base; 15. Base cover; 16. Installation inner cavity; 17. Connecting pipe; 2. Chain guiding member; 21. Chain guiding plate; 22. Main shaft; 23. Reset member; 24. Chain mounting plate; 25. Guide wheel; 26. Tensioning wheel; 3. Truncated piece; 31. Communication hole; 4. Damping sheet; 41. Flowable hole; 5. Damping member; 51. Elastic sheet; 511. First connecting portion; 512. Second connecting portion; 513. Third connecting portion; 514. Installation hole; 52. Contact column; 521. Contact portion; 522. Sliding portion; 523. Limiting portion; 53. Screw; 6. First direction; 7. Deformable body; 8. Return groove; 9. Opening and closing member; 91. One-way column; 911. Yielding hole; 92. Connecting column; 93. Rotating block; 10. Base member; 101. Hinged quadrilateral member; 102. First sealing gasket. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0038] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0039] It should be further understood that the term "and / or" used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0040] Combined Figure 1 and Figure 2 , an embodiment of the present invention provides a derailleur with a damping function, including a derailleur body. The derailleur body includes a P joint seat 1 and a chain guide member 2 that are rotatably connected. The chain guide member 2 includes a chain guide plate 21 rotatably connected to one end of the P joint seat 1, a main shaft 22 with one end fixed to one end of the chain guide plate 21, and a reset member 23 with one end fixedly connected to the chain guide plate 21 and the other end rotatably connected to the P joint seat 1. The other end of the main shaft 22 extends into the closed inner cavity 11 of the P joint seat 1. Among them,

[0041] A cut-off piece 3 is fixedly provided in the closed inner cavity 11 and abuts against the outer peripheral side of the main shaft 22. The cut-off piece 3 extends along the rotation axis of the closed inner cavity 11;

[0042] A damping piece 4 for dividing the gap between the closed inner cavity 11 and the main shaft 22 into a first flow cavity 12 and a second flow cavity 13 is fixedly provided on the main shaft 22. Among them, damping liquid is contained in both the first flow cavity 12 and the second flow cavity 13;

[0043] A damping member 5 is provided on the damping sheet 4. The damping member 5 is used to prevent the damping liquid in the first flow cavity 12 from entering the second flow cavity 13 when the chain guiding member 2 rotates in the first direction 6, and is used to allow the damping liquid in the first flow cavity 12 to enter the second flow cavity 13 when the chain guiding member 2 rotates in the second direction, wherein the first direction 6 and the second direction have opposite helix directions.

[0044] In this embodiment, the rear derailleur body further includes a base member 10 for fixedly connecting with the bicycle frame, and an articulated quadrilateral member 101 rotatably connected to the base member 10 and the P joint seat 1 respectively. It should be noted that both the base member 10 and the articulated quadrilateral member 101 adopt corresponding structures in existing rear derailleurs, so this application will not elaborate too much.

[0045] In this embodiment, the chain guiding member 2 further includes a chain mounting plate 24, a guide wheel 25 and a tensioning wheel 26. The chain mounting plate 24 and the chain guiding plate 21 are symmetrically and spaced apart, and the guide wheel 25 and the tensioning wheel 26 are respectively rotatably mounted between the chain guiding plate 21 and the chain mounting plate 24 by bolting, and the guide wheel 25 and the tensioning wheel 26 are respectively located at both ends of the chain guiding plate 21.

[0046] In this embodiment, the P joint seat 1 includes a base 14 and a base cover 15. The sealed inner cavity 11 is located at one end of the base 14. The base cover 15 is used to seal the opening of the sealed inner cavity 11, and a first sealing ring gasket 102 is embedded between the base cover 15 and the base 14 to seal the gap between the base 14 and the base cover 15; an installation inner cavity 16 is provided at the other end of the base 14, and the installation inner cavity 16 is communicated with the sealed inner cavity 11 through a connecting pipe 17. The connecting pipe 17 extends along the length direction of the installation inner cavity 16. Among them, the reset member 23 is a reset torsion spring, and the reset torsion spring is sleeved on the outer peripheral side of the connecting pipe 17, and one end of the reset torsion spring is fixed on the bottom wall of the installation inner cavity 16 and the other end is fixed on one end of the chain guiding plate 21, and is used to reset the initial position between the P joint seat 1 and the chain guiding plate 21 when the P joint seat 1 rotates relative to the chain guiding plate 21.

[0047] In this embodiment, one end of the main shaft 22 is fixedly connected with the chain guiding plate 21 by bolting, and the other end passes through the connecting pipe 17 and extends into the sealed inner cavity 11. Among them, the other end of the main shaft 22 abuts against the base cover 15, so that the sealed inner cavity 11 becomes an annular cavity. Through such a setting, the rotation of the chain guiding plate 21 will drive the rotation of the main shaft 22.

[0048] During the riding of the bicycle on bumpy roads, the P joint seat 1 and the chain guiding member 2 will rotate relative to each other, such as relative clockwise rotation or relative counterclockwise rotation. In this embodiment, when the P joint seat 1 and the chain guiding member 2 rotate relative to each other counterclockwise, it will cause the chain to become undesirably loose. Therefore, in order to reduce the occurrence of undesired rotation between the P joint seat 1 and the chain guide plate 21, the derailleur of the present application can achieve a one-way damping function. The present application divides the sealed inner cavity 11 into a first flow cavity 12 and a second flow cavity 13, and fills the first flow cavity 12 and the second flow cavity 13 with damping liquid. Specifically, the damping piece 4 and the cut-off piece 3 are arranged to extend in the same direction. Among them, the outer side of the cut-off piece 3 facing away from the main shaft 22 is fixedly arranged on the inner side of the sealed inner cavity 11, and the inner side of the cut-off piece 3 facing the main shaft 22 abuts against the outer peripheral side of the main shaft 22. During manufacturing, according to actual needs, a sealing structure can be provided between the cut-off piece 3 and the main shaft 22. For example, a sealing strip is embedded on the inner side of the cut-off piece 3 to improve the sealing performance of the first flow cavity 12 and the second flow cavity 13. Therefore, the present application will not elaborate further.

[0049] In this embodiment, the inner side of the damping piece 4 facing the main shaft 22 is integrally formed on the outer peripheral side of the main shaft 22 to improve the structural stability of the two. The outer side of the damping piece 4 facing away from the main shaft 22 abuts against the inner side of the sealed inner cavity 11. During manufacturing, according to actual needs, a sealing structure can also be provided on the outer side of the damping piece 4. For example, a sealing strip is embedded on the outer side of the damping piece 4 to improve the sealing performance of the first flow cavity 12 and the second flow cavity 13. Therefore, the present application will not elaborate further.

[0050] It should be noted that the damping liquid of the present application includes but is not limited to lubricating liquid. Among them, the damping liquid fills the entire sealed inner cavity 11, that is to say, there is no air in the first flow cavity 12 and the second flow cavity 13. However, due to manufacturing errors, a small amount of gas may also exist in the first flow cavity 12 and the second flow cavity 13, as long as the quantity of this part of gas does not affect the one-way damping function of the derailleur of the present application. Therefore, it will not be elaborated further.

[0051] During actual riding, if the main shaft 22, the chain guiding member 2 and the base 14 rotate undesirably, for example, rotate in the first direction 6, since the damping member 5 prevents the damping liquid in the first flow chamber 12 from entering the second flow chamber 13, the damping piece 4 is subjected to the pressure of the damping liquid in the first flow chamber 12, that is, the damping piece 4 will squeeze the damping liquid. It should be understood that, based on the principle of "liquids are theoretically compressible", the main shaft 22, the chain guiding member 2 and the base 14 will rotate correspondingly, but this rotation angle is extremely small and can be ignored. If the main shaft 22, the chain guiding member 2 and the base 14 rotate relative to each other in the second direction, since the damping member 5 allows the damping liquid in the first flow chamber 12 to enter the second flow chamber 13, the damping liquid in the first flow chamber 12 will flow into the second flow chamber 13. At this time, the damping piece 4 is not subjected to the pressure of the damping liquid, that is, relative rotation between the main shaft 22, the chain guiding member 2 and the base 14 is smoothly generated. Since the one-way damping function of the derailleur is realized by the damping liquid in this application, this will not cause the phenomenon of loss of the damping liquid, nor will it cause any wear to the damping piece 4 and the damping member 5. Therefore, the service life of the one-way damping function of the derailleur in this application is relatively long.

[0052] It should be noted that according to the installation position of the derailleur, the first direction 6 can be the clockwise direction or the counterclockwise direction, as long as the rotation directions of the first direction 6 and the second direction are opposite.

[0053] In a specific embodiment, at least one deformable body 7 is placed in the first flow chamber 12 and / or the second flow chamber 13.

[0054] In this embodiment, the deformable body 7 of the present application can be made of silica gel material, but during manufacturing, according to actual needs, the deformable body 7 can also be made of other elastic materials, and the application does not make specific limitations.

[0055] In this embodiment, the shape of the deformable body 7 is spherical to facilitate entry into the first flow chamber 12, but during manufacturing, according to actual needs, the shape of the deformable body 7 can also be other, and the application does not make specific elaboration.

[0056] In this embodiment, one deformable body 7 is provided in the first flow chamber 12. According to actual needs, the deformable body 7 can also be placed in the second flow chamber 13. It should be understood that the number of deformable bodies 7 can also be other, as long as it can compensate for the volume change of the damping liquid caused by temperature change, so as to ensure that the liquid in the first flow chamber 12 and the second flow chamber 13 is always full and ensure the realization of the damping function.

[0057] In this embodiment, the deformable body 7 abuts against the outer peripheral side of the main shaft 22 and the inner side wall of the first flow chamber 12, so as to limit the deformable body 7, and reduce the situation that the deformable body 7 moves freely in the first flow chamber 12. During manufacturing, according to actual needs, one side of the deformable body 7 can be relatively fixed to the main shaft 22 or the P joint seat 1 by bonding, so as to limit the deformable body 7.

[0058] In a specific embodiment, at least one return groove 8 for communicating the first flow chamber 12 and the second flow chamber 13 is provided on the inner side wall of the closed inner cavity 11, and the groove depth of the return groove 8 gradually increases in the direction from the second flow chamber 13 to the first flow chamber 12.

[0059] In this embodiment, in order to reduce the load on the damping piece 4, the present application is provided with a return groove 8. Specifically, the extending direction of the return groove 8 is perpendicular to the rotation axis of the main shaft 22. However, the extending direction of the return groove 8 can also form an angle with the rotation axis of the main shaft 22. And during manufacturing, the shape of the return groove 8 can also be an irregular shape, as long as there is a through groove between the first flow chamber 12 and the second flow chamber to communicate the two, so that the chain guide plate 21 and the main shaft 22 can rotate at a certain angle relative to the P joint seat 1 along the first direction 6. And during the process of increasing the rotation angle (that is, when the volume of the first flow chamber 12 gradually decreases), part of the damping liquid in the first flow chamber 12 will flow into the second flow chamber 13 through the return groove 8. However, since the speed of flowing into the second flow chamber 13 through the return groove 8 is slow, the damping piece 4 will still be subjected to a large damping force, realizing the function of one-way damping.

[0060] And since the groove depth of the return groove 8 gradually increases in the direction from the second flow chamber 13 to the first flow chamber, the pressure loss of the first flow chamber 12 gradually increases, so that the damping forces on the damping piece 4, the main shaft 22 and the chain guide plate 21 gradually decrease. Thus, at the same time, since the rotation angle between the chain guide plate 21 and the P joint seat 1 is large, the torsion of the return spring also gradually increases. By means of reducing the damping force through the return groove 8, the thrust of the shift lever of the finger shift is made stable and uniform.

[0061] In this embodiment, there is 1 return groove 8. However, during manufacturing, according to actual needs, the number of return grooves 8 can also be other numbers, such as 2 or 3. The present application does not make specific limitations.

[0062] In a specific embodiment, the damping piece 4 is provided with at least one flowable hole 41 penetrating through the first flow chamber 12 and the second flow chamber 13, and the damping members 5 are arranged in one-to-one correspondence with the flowable holes 41. Each damping member 5 includes:

[0063] The elastic sheet 51, one end of the elastic sheet 51 is fixedly arranged on one side of the damping sheet 4, and the other end seals the opening of the flowable hole 41 when the chain guiding member 2 rotates in the first direction 6, and opens the opening of the flowable hole 41 when the chain guiding member 2 rotates in the second direction and reseals the opening of the flowable hole 41 after the reset member 23 is reset.

[0064] In this embodiment, two flowable holes 41 and damping members 5 are symmetrically arranged at intervals. If necessary and / or desired, the number of flowable holes 41 can be other, and the present application does not specifically limit the aperture of the flowable holes 41, as long as the damping liquid in the first flow chamber 12 is allowed to enter the second flow chamber 13 when the chain guiding member 2 rotates in the second direction, that is, the damping sheet 4 is not affected by the damping force.

[0065] Specifically, the elastic sheet 51 is located in the first flow chamber 12. When the chain guiding member 2 rotates in the first direction 6, the elastic sheet 51 is pressed by the damping liquid in the first flow chamber 12 and abuts against the opening of the flowable hole 41, so that the damping liquid in the first flow chamber 12 and the second flow chamber 13 cannot exchange liquid through the flowable hole 41. When the chain guiding member 2 rotates in the second direction, the elastic sheet 51 undergoes elastic deformation under the pressure of the damping liquid in the second flow chamber 13, that is, the free end of the elastic sheet 51 opens in a direction away from the damping sheet 4, so that the liquid in the second flow chamber 13 can smoothly flow into the first flow chamber 12 through the flowable hole 41. In other words, the damping sheet 4 is not affected by the damping force, and the P joint seat 1 can rotate smoothly.

[0066] In a specific embodiment, the damping member 5 further includes an abutting column 52 arranged on the elastic sheet 51, and one end of the abutting column 52 abuts against the opening of the flowable hole 41.

[0067] In this embodiment, the abutting column 52 can be made of materials such as silica gel and rubber, so that the contact between the abutting column 52 and the damping sheet 4 is more precise, that is, the sealing effect on the flowable hole 41 is improved; when the chain guiding member 2 rotates in the second direction, the end face of the abutting column 52 facing the second flow chamber 13 will be squeezed by the damping liquid in the second process and push the elastic sheet 51 to deform, thereby opening the flowable hole 41.

[0068] In a specific embodiment, the elastic sheet 51 includes a first connecting portion 511, a second connecting portion 512 and a third connecting portion 513 connected in sequence, the first connecting portion 511 and the third connecting portion 513 are respectively fixed at both ends of the second connecting portion 512, and the first connecting portion 511 and the third connecting portion 513 are respectively located on opposite sides of the second connecting portion 512, wherein the abutting column 52 is fixedly connected to the third connecting portion 513, and the first connecting portion 511 is fixed on the damping sheet 4.

[0069] In this embodiment, the first connection part 511, the second connection part 512 and the third connection part 513 are integrally formed to improve the structural stability of the elastic sheet 51, thereby extending the service life of the elastic sheet 51. The first connection part 511 of the present application is fixed to the damping sheet 4 by a screw 53. During manufacturing, according to actual needs, the first connection part 511 can also be fixedly connected to the damping sheet 4 by bonding.

[0070] It should be noted that, in the present application, the second connection portion 512 is arranged to be inclined and outwardly expanded in a direction away from the first connection portion 511 to maximize the contact area between the elastic sheet 51 and the damping liquid in the first flow cavity 12 .

[0071] In a specific embodiment, the third connecting portion 513 is provided with a mounting hole 514, and the abutting column 52 includes:

[0072] an abutting portion 521 , the abutting portion 521 being located between the third connecting portion 513 and the damping plate 4 and configured to abut against the opening of the flow hole 41 ;

[0073] a sliding portion 522 , the sliding portion 522 being slidably connected to the mounting hole 514 ;

[0074] a limiting portion 523 , the limiting portion 523 being located on a side of the third connecting portion 513 facing away from the damping plate 4 ;

[0075] The end areas of the contact portion 521 and the limiting portion 523 at one opposite end are both larger than the cross-sectional area of the sliding portion 522 .

[0076] In this embodiment, the abutting portion 521, the sliding portion 522 and the limiting portion 523 are integrally formed to improve the structural strength of the three, wherein a guide slope is provided at one end of the limiting portion 523 away from the sliding portion 522, and the length of the sliding portion 522 is greater than the thickness of the third connecting portion 513, so that the sliding portion 522 can move a short distance relative to the third connecting portion 513. Through the above arrangement, it is convenient to install the abutting column 52 on the elastic sheet 51.

[0077] In a specific embodiment, a communication hole 31 penetrating through the first flow chamber 12 and the second flow chamber 13 is provided on the truncation piece 3, and an opening and closing member 9 for opening and closing the communication hole 31 is provided on the P joint seat 1.

[0078] For the sake of convenience of description, the riding modes corresponding to this derailleur are named as the bumpy mode and the smooth mode. Among them, the specific application scenarios of the smooth mode are as follows. When riding on a smooth road condition, the riding user can use the opening and closing member 9 to control the communication between the first flow chamber 12 and the second flow chamber 13, so that when the chain guiding member 2 rotates along the first direction 6 or the second direction, the damping liquid in the first flow chamber 12 and the second flow chamber 13 can flow through the communication hole 31 accordingly, and no damping force is generated between the main shaft 22 and the P joint seat 1, that is, the one-way damping function of the derailleur fails.

[0079] The specific application scenarios of the bumpy mode are as follows. When riding on a bumpy road condition, the riding user can use the sealing member to close the communication hole 31, so that the damping liquid in the first flow chamber 12 and the second flow chamber 13 cannot flow through the communication hole 31. When the chain guiding member 2 rotates along the first direction 6, it will still be subject to a damping force. That is to say, the one-way damping function of the derailleur is restored.

[0080] By selecting the mode of the control member as described above, the operating comfort of the riding user can be effectively improved. It should be noted that during the riding process, this application does not make specific limitations on which control mode to select under which road conditions.

[0081] In a specific embodiment, the opening and closing member 9 includes:

[0082] A one-way column 91, the one-way column 91 is rotatably connected to the communication hole 31, and a relief hole 911 penetrating through both sides thereof is provided on the one-way column 91;

[0083] A connecting column 92, the connecting column 92 is threadedly connected to the P joint seat 1, and one end thereof is fixed to one end of the one-way column 91 and the other end extends out of the outside of the P joint seat 1;

[0084] A rotating block 93, one end of the rotating block 93 is fixed to the other end of the connecting column 92.

[0085] In this embodiment, when the relief hole 911 communicates with the communication hole 31, the first flow chamber 12 and the second flow chamber 13 are connected, and the damping liquid can flow between the two flow chambers through the relief hole 911. When the relief hole 911 does not communicate with the communication hole 31, that is, when the opening of the relief hole 911 is blocked and sealed by the inner wall of the communication hole 31, the damping liquid cannot flow between the two flow chambers through the relief hole 911.

[0086] An embodiment of the present invention further provides a bicycle, which includes a bicycle body and further includes the derailleur with damping function as described above, and the derailleur with damping function is installed on the bicycle body.

[0087] It should be noted that this application mainly focuses on the improvement of the derailleur of the bicycle, so the bicycle body will not be specifically described. The derailleur of this application is suitable for being assembled on any existing bicycle body with a speed change function.

[0088] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A rear derailleur with damping function, comprising a rear derailleur body, the rear derailleur body includes a P joint seat (1) and a chain guiding member (2) which are rotatably connected to each other. The chain guiding member (2) includes a chain guiding plate (21) rotatably connected to one end of the P joint seat (1), a main shaft (22) with one end fixedly arranged at one end of the chain guiding plate (21), and a reset member (23) with one end fixedly connected to the chain guiding plate (21) and the other end rotatably connected to the P joint seat (1). The other end of the main shaft (22) extends into the closed inner cavity (11) of the P joint seat (1). It is characterized in that: A cut-off piece (3) is fixedly arranged in the closed inner cavity (11) and abuts against the outer peripheral side of the main shaft (22), and the cut-off piece (3) extends along the rotation axis of the closed inner cavity (11); A damping piece (4) is fixedly arranged on the main shaft (22) for dividing the gap between the closed inner cavity (11) and the main shaft (22) into a first flow cavity (12) and a second flow cavity (13). Among them, damping liquid is contained in both the first flow cavity (12) and the second flow cavity (13); A damping member (5) is arranged on the damping piece (4). The damping member (5) is used to prevent the damping liquid in the first flow cavity (12) from entering the second flow cavity (13) when the chain guiding member (2) rotates in the first direction (6), and is used to allow the damping liquid in the first flow cavity (12) to enter the second flow cavity (13) when the chain guiding member (2) rotates in the second direction. Among them, the rotation directions of the first direction (6) and the second direction are opposite; At least one return groove (8) for communicating the first flow cavity (12) and the second flow cavity (13) is arranged on the inner side wall of the closed inner cavity (11), and the groove depth of the return groove (8) gradually increases in the direction from the second flow cavity (13) to the first flow cavity (12); 2. The derailleur with damping function according to claim 1, characterized in that: At least one deformable body (7) is placed in the first flow cavity (12) and / or the second flow cavity (13); 3. The derailleur with damping function according to any one of claims 1-2, characterized in that: At least one flowable hole (41) penetrating through the first flow cavity (12) and the second flow cavity (13) is arranged on the damping piece (4), and the damping members (5) are arranged in one-to-one correspondence with the flowable holes (41). Each damping member (5) includes: An elastic piece (51), one end of the elastic piece (51) is fixedly arranged on one side of the damping piece (4), and the other end closes the opening of the flowable hole (41) when the chain guiding member (2) rotates in the first direction (6), and opens the opening of the flowable hole (41) when the chain guiding member (2) rotates in the second direction and re-closes the opening of the flowable hole (41) after the reset member (23) resets; 4. The derailleur with damping function according to claim 3, characterized in that: The damping member (5) further includes an abutting column (52) arranged on the elastic piece (51), and one end of the abutting column (52) abuts against the opening of the flowable hole (41).

5. The derailleur with damping function according to claim 4, characterized in that: The elastic sheet (51) includes a first connecting portion (511), a second connecting portion (512) and a third connecting portion (513) connected in sequence, wherein the first connecting portion (511) and the third connecting portion (513) are respectively fixed at two ends of the second connecting portion (512), and the first connecting portion (511) and the third connecting portion (513) are respectively located on opposite sides of the second connecting portion (512), wherein the abutting column (52) is fixedly connected to the third connecting portion (513), and the first connecting portion (511) is fixed on the damping sheet (4).

6. The derailleur with damping function according to claim 5, characterized in that: The third connecting portion (513) is provided with a mounting hole (514), and the abutting column (52) comprises: an abutting portion (521), the abutting portion (521) being located between the third connecting portion (513) and the damping plate (4), and being configured to abut against the opening of the flowable hole (41); a sliding portion (522), the sliding portion (522) being slidably connected to the mounting hole (514); a limiting portion (523), the limiting portion (523) being located on a side of the third connecting portion (513) facing away from the damping plate (4); Wherein, the end areas of the opposing ends of the abutting portion (521) and the limiting portion (523) are both larger than the cross-sectional area of the sliding portion (522).

7. The derailleur with damping function according to any one of claims 1-2, characterized in that: The truncation piece (3) is provided with a communication hole (31) that passes through the first flow cavity (12) and the second flow cavity (13), and the P joint seat (1) is provided with an opening and closing member (9) for opening and closing the communication hole (31).

8. The derailleur with damping function according to claim 7, wherein: The opening and closing member (9) comprises: A one-way column (91), the one-way column (91) is rotatably connected to the communication hole (31), and the one-way column (91) is provided with a clearance hole (911) running through both sides thereof; A connecting column (92), the connecting column (92) is threadedly connected to the P joint seat (1), and one end of the connecting column is fixed to one end of the one-way column (91), and the other end extends out of the outside of the P joint seat (1); A rotating block (93), one end of the rotating block (93) is fixed to the other end of the connecting column (92).

9. A bicycle, comprising a bicycle body, characterized in that: It also includes a rear derailleur with a damping function according to any one of claims 1 to 8, wherein the rear derailleur with a damping function is mounted on the bicycle body.

Images