Compact rear derailleur

Abstract

The present invention discloses a compact rear derailleur, comprising: a base member, on which a first pivot, a guide nozzle, and a second pivot are sequentially mounted along the left-right direction; a movable member, rotatably connected to a derailleur wheel on the left side, on which a fourth pivot and a third pivot are sequentially mounted along the left-right direction; a base member, an inner swing block, a movable member, and an outer swing block forming a parallel four-bar linkage; a wiring frame, mounted on the outer swing block on a side facing the inner swing block and accommodated within the parallel four-bar linkage, the wiring frame being provided with a winding portion and a clamping portion, and the shift cable being clamped to the clamping portion after passing around the winding portion; and an elastic reset member. The rear derailleur ensures that the shift cable segment from the guide nozzle to the clamping portion is within the parallel four-bar linkage, effectively enclosing and protecting the shift cable, the winding portion, and the clamping portion from accidental damage such as collision and scratching, thereby achieving a compact design, reducing the overall occupied space, and ensuring the smooth operation of the shift cable.

Description

Technical Field

[0001] The present invention relates to the technical field of speed-changing bicycles, in particular to a rear derailleur. Background Art

[0002] The rear derailleur is an important component in a bicycle's speed shifting system. It usually includes a base member, a movable member, and a derailleur wheel. The movable member is connected to the base member through a parallel four-bar linkage. The derailleur wheel is mounted on the movable member. The derailleur wheel is responsible for shifting the chain between different flywheels on the rear wheel. One end of the shift cable (also known as the speed cable) is connected to the finger-shift transmission, and the other end is connected to the cable point extending from the parallel four-bar linkage. The finger-shift transmission pulls or releases the cable point through the shift cable, rotates the movable member, realizes the movement of the derailleur wheel, and achieves the purpose of shifting gears and speed.

[0003] At present, the shift cable is generally fixed to the cable pulling point by a clamping screw, which is set below the parallel four-bar linkage or on the outside of the parallel four-bar linkage away from the frame. The shift cable and the cable pulling point are easily damaged by accidental collisions, scratches, etc., and are also easily contaminated by external impurities such as mud and dust. As a result, the shift cable is not smooth during the pulling process and needs to be cleaned regularly. In addition, the external connection point will destroy the overall streamlined design of the bicycle and reduce its aesthetics. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a rear derailleur that can reduce damage and contamination, improve the smoothness of pulling the shift cable, and enhance the overall streamlined design and aesthetics.

[0005] The compact rear derailleur according to an embodiment of the present invention has a first rotation direction and a second rotation direction that are opposite to each other, and includes: a base member configured to be mounted on a bicycle frame, the base member being sequentially mounted with a first pivot, a wire nozzle, and a second pivot in a left-right direction, the wire nozzle being used for allowing a shift cable to pass through; a movable member being rotatably connected to a derailleur wheel on the left side, the movable member being sequentially mounted with a fourth pivot and a third pivot in a left-right direction, the axes of the first pivot, the second pivot, the third pivot, and the fourth pivot being parallel to each other; an inner swing block, a front end of which is hinged to the movable member via the fourth pivot, and a rear end of which is hinged to the base member via the first pivot; an outer swing block, a front end of which is hinged to the movable member via the fourth pivot The third pivot is hinged to the movable component, and the rear end is hinged to the base component through the second pivot. The base component, the inner swing block, the movable component and the outer swing block constitute a parallel four-bar linkage mechanism; the wiring frame is installed on the side of the outer swing block facing the inner swing block and is accommodated in the interior of the parallel four-bar linkage mechanism, and the wiring frame is provided with a winding part and a clamping part. The shift wire is clamped on the clamping part after passing around the winding part, and the shift wire can pull the outer swing block to rotate around the second pivot in the first rotation direction; the elastic reset member is configured to apply a torque to the outer swing block to rotate around the second pivot in the second rotation direction.

[0006] At least the following beneficial effects are achieved: the rear derailleur retains the basic frame structure in which the derailleur wheel is connected to the bicycle frame by rotating through a parallel four-bar linkage. On this basis, the base component sets the wire nozzle between the first pivot and the second pivot in the left-right direction. The winding part and the wire clamping part on the wiring frame are installed on the side of the outer swing block facing the inner swing block and are accommodated in the interior of the parallel four-bar linkage. The shift wire is clamped on the wire clamping part after passing around the winding part, ensuring that the line segment of the shift wire from the wire nozzle to the wire clamping part is inside the parallel four-bar linkage. It effectively surrounds and protects the shift cable, winding part and wire clamping part to avoid accidental damage such as collision and scratch, and reduces the adhesion and contamination of external impurities such as mud, dust, etc., ensuring the smoothness of the shift cable during the pulling process. It does not require frequent cleaning and can also enhance the overall streamlined design and aesthetics of the bicycle. It also realizes a compact design and reduces the overall occupied space. In addition, the shift cable first bypasses the winding part before being clamped in the wire clamping part to prevent the shift cable from interfering with the parallel four-bar linkage and scratching, further ensuring the smoothness of the shift cable during the pulling process.

[0007] According to some embodiments of the present invention, the winding portion includes a winding groove arranged on the outer edge of the wiring frame, the extension trajectory of the winding groove is a curve and is perpendicular to the axial direction of the second pivot, the opening of the winding groove is away from the second pivot, and when the distance between the inner swing block and the outer swing block is the shortest, the inner swing block and the winding groove define a first threading channel for the shift cable to pass through, and the first threading channel extends to the wire clamping portion.

[0008] According to some embodiments of the present invention, the extension trajectory of the winding groove is an arc line with the second pivot as the center.

[0009] According to some embodiments of the present invention, an avoidance groove is provided on the side of the inner swing block facing the winding portion. When the distance between the inner swing block and the outer swing block is the shortest, the winding portion extends into the avoidance groove, and the bottom of the avoidance groove and the winding groove are combined to form the first threading channel.

[0010] According to some embodiments of the present invention, the winding portion includes a wire threading flare connected to an end of the winding groove away from the wire clamping portion, and the first wire threading channel extends from the wire threading flare to the wire clamping portion.

[0011] According to some embodiments of the present invention, the wire clamping portion includes a positioning block, a pressure block and a fastener. The positioning block is fixedly mounted on the wiring frame. The pressure block can be fastened to the positioning block through the fastener. The pressure block is configured to cooperate with the positioning block to clamp the shift cable.

[0012] According to some embodiments of the present invention, a side stop is provided on the pressure block, extending toward the positioning block from one end of the fastener. Before the pressure block and the positioning block clamp the shift cable, a second threading channel is defined between the positioning block, the side stop, the pressure block and the fastener. The axial direction of the sprocket extends in the left and right directions, the axial direction of the second pivot is perpendicular to the axial direction of the sprocket, the axial direction of the fastener is not parallel to the axial direction of the second pivot, and the second threading channel extends downward or upward from one end close to the winding portion.

[0013] According to some embodiments of the present invention, the positioning block is provided with an anti-slip groove on one side facing the pressure block, and the anti-slip groove is configured to cooperate with the pressure block to clamp the shift cable. The anti-slip groove can accommodate part of the shift cable to prevent the shift cable from deviating from the positioning block.

[0014] According to some embodiments of the present invention, a plurality of protrusions are arranged at intervals along the extension direction in the anti-slip groove, and the protrusions extend from the bottom of the anti-slip groove toward the pressure block protrusion but do not exceed the opening of the anti-slip groove.

[0015] According to some embodiments of the present invention, the outer swing block is provided with a first stopper, and the base component is provided with a second stopper. When the parallel four-bar linkage is in one of the extreme positions, the second stopper stops the wiring frame, and when the parallel four-bar linkage is in the other extreme position, the first stopper stops the movable component.

[0016] According to some embodiments of the present invention, the elastic return member is a tension spring, and the elastic return member is arranged between the fourth pivot and a position on the outer swing block that deviates from the third pivot.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 This is a structural schematic diagram of a parallel four-bar linkage in an intermediate state according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the parallel four-bar linkage according to an embodiment of the present invention when it is in one of its extreme positions;

[0021] Figure 3 for Figure 2 A schematic diagram of a portion of the structure from another perspective;

[0022] Figure 4 Schematic diagram of the structure of the parallel four-bar linkage according to the embodiment of the present invention when it is in another extreme position;

[0023] Figure 5 is a partial structural diagram of the parallel four-bar linkage in an embodiment of the present invention when it is in another extreme position;

[0024] Figure 6 Schematic diagram of the structure of the inner and outer swing blocks and the wiring frame in an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the structure of the wiring rack in an embodiment of the present invention.

[0026] Figure numbers: base member 1, first pivot 11, second pivot 12, wire nozzle 13, second stopper 14, shift cable 2, movable member 3, third pivot 31, fourth pivot 32, derailleur 4, inner swing block 5, avoidance groove 51, outer swing block 6, first stopper 61, wiring rack 7, winding portion 71, winding groove 711, threading flare 712, wire clamping portion 72, positioning block 721, pressure block 722, fastener 723, side stopper 724, anti-slip groove 725, protrusion 726, elastic reset member 8, first threading channel 9, second threading channel 10. DETAILED DESCRIPTION

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, inside, outside, axial, side, end, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present invention, if there is a description of first, second, third, and fourth, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, hinged, rotating, bypassing, and clamping should be understood in a broad sense. Technical personnel in the relevant technical field can reasonably determine the specific meaning of the above terms in the present invention based on the specific content of the technical solution.

[0030] Reference Figures 1 to 7 The present invention discloses a compact rear derailleur having opposite first and second rotation directions, including a base component 1, a movable component 3, a derailleur wheel 4, an inner swing block 5, an outer swing block 6, a terminal frame 7 and an elastic reset member 8.

[0031] Among them, reference Figure 1 The base member 1 is configured to be mounted on a bicycle frame. The base member 1 is a fixed part of the rear derailleur. The base member 1 is sequentially mounted with a first pivot 11, a wire nozzle 13, and a second pivot 12 along the left-right direction. The wire nozzle 13 is arranged between the first pivot 11 and the second pivot 12 in the left-right direction. The wire nozzle 13 is used for allowing the shift cable 2 to pass through. One end of the shift cable 2 is connected to the shift transmission, and the other end passes through the wire nozzle 13 and is connected to the wiring rack 7.

[0032] Reference Figures 1 to 4The left side of the movable member 3 is connected to the sprocket 4, which can rotate around its own axis relative to the movable member 3. When shifting, the chain switches between different flywheels, which will cause the tension and posture to change and adjust. The sprocket 4 and the tensioning wheel will also rotate around the rotating shaft on the movable member 3. For details, please refer to Figure 1 、 Figure 2 and Figure 4 The movable member 3 is sequentially mounted with a fourth pivot 32 and a third pivot 31 along the left-right direction, and the axial directions of the first pivot 11, the second pivot 12, the third pivot 31 and the fourth pivot 32 are parallel to each other.

[0033] Reference Figure 2 and Figure 3 The front end of the inner swing block 5 is hinged to the movable member 3 through the fourth pivot 32, and the rear end is hinged to the base member 1 through the first pivot 11. The front end of the outer swing block 6 is hinged to the movable member 3 through the third pivot 31, and the rear end is hinged to the base member 1 through the second pivot 12. The base member 1, the inner swing block 5, the movable member 3 and the outer swing block 6 constitute a parallel four-bar linkage, and the parallel four-bar linkage is a three-dimensional spatial structure. Figure 1 、 Figure 2 and Figure 4 The structural schematic diagrams of the parallel four-bar linkage are shown in the middle state and two extreme positions respectively.

[0034] Reference Figure 1 The wiring frame 7 is installed on the side of the outer swing block 6 facing the inner swing block 5 and is accommodated inside the parallel four-bar linkage. The wiring frame 7 is provided with a winding portion 71 and a clamping portion 72. The shift cable 2 is clamped on the clamping portion 72 after passing around the winding portion 71. The shift cable 2 can pull the outer swing block 6 to rotate around the second pivot 12 along the first rotation direction.

[0035] Reference Figure 1 、 Figure 2 and Figure 4 The elastic return member 8 is configured to apply a torque to the outer swing block 6 around the second pivot 12 in the second rotation direction. When the shifter releases the shift cable, the elastic return member 8 can force the outer swing block 6 to rotate in the second rotation direction to achieve the purpose of reset and keep the shift cable always in a tensioned state.

[0036] The present rear derailleur retains the basic frame structure of the derailleur wheel 4 being connected to the bicycle frame by rotating through a parallel four-bar linkage. On this basis, the base member 1 sets the wire nozzle 13 between the first pivot 11 and the second pivot 12 in the left and right directions. The winding portion 71 and the wire clamping portion 72 on the wiring frame 7 are installed on the side of the outer swing block 6 facing the inner swing block 5, and are accommodated in the interior of the parallel four-bar linkage. The shift cable 2 is clamped on the wire clamping portion 72 after passing around the winding portion 71, ensuring that the line segment of the shift cable 2 from the wire nozzle 13 to the wire clamping portion 72 is all within the interior of the parallel four-bar linkage, effectively enclosing and protecting the shift cable 2, the winding portion 71 and the wire clamping portion 72, avoiding accidental damage such as collision and scratching, and reducing the adhesion and contamination of impurities such as mud, dust, etc. from the outside, ensuring the smoothness of the shift cable 2 during the pulling process, without the need for frequent cleaning, and also improving the overall streamlined design and aesthetics of the bicycle.

[0037] It also achieves a compact design and reduces the overall occupied space. In addition, the shift cable 2 first passes around the winding portion 71 before being clamped in the wire clamping portion 72, preventing the shift cable 2 from interfering with the parallel four-bar linkage and further ensuring the smoothness of the shift cable 2 during the pulling process.

[0038] Reference Figure 4 and Figure 6 A first stopper 61 can be provided on the outer swing block 6. When the parallel four-bar linkage is in another extreme position, the first stopper 61 can stop the movable component 3. At this time, the sprocket 4 is in the rightmost position, and the chain is installed on the rightmost flywheel.

[0039] Reference Figure 2 and Figure 3 A second stopper 14 can be provided on the base member 1. When the parallel four-bar linkage is in one of its extreme positions, the second stopper 14 can stop the wiring rack 7. At this time, the sprocket 4 is in the leftmost position, and the chain is installed on the leftmost flywheel.

[0040] In some embodiments of the present invention, reference Figure 6 and Figure 7 The winding portion 71 includes a winding groove 711 arranged on the outer edge of the wiring frame 7. The extension trajectory of the winding groove 711 is a curve and is perpendicular to the axial direction of the second pivot 12. The opening of the winding groove 711 is away from the second pivot 12. It can be understood that the extension trajectory of the winding groove 711 is a curve and is in the same plane, and the axial direction of the second pivot 12 is perpendicular to the plane where the extension trajectory of the winding groove 711 is located.

[0041] It is understandable that when the clamping portion 72 is not yet connected to the shift cable 2, the shift cable 2 cannot exert a pulling effect on the parallel four-bar linkage. At this time, the parallel four-bar linkage is in another extreme position under the action of the elastic reset member 8. Figure 4and Figure 5 , the distance between the inner swing block 5 and the outer swing block 6 is set to the shortest at this time, and the inner swing block 5 and the winding groove 711 define a first threading channel 9 for the shift cable 2 to pass through. The first threading channel 9 extends to the wire clamping portion 72, so that the shift cable 2 passing through the wire nozzle 13 is conveniently inserted into the first threading channel 9, and gradually extends along the internal space of the first threading channel 9 to the wire clamping portion 72, so that the shift cable 2 can smoothly bypass the winding groove 711 and be installed on the wire clamping portion 72.

[0042] In some embodiments, reference Figure 2 and Figure 6 The extension trajectory of the winding groove 711 is an arc line with the second pivot 12 as the center, and when the shift cable 2 is pulled or released, the winding groove 711 just rotates around the second pivot 12. That is to say, when the shift cable 2 is pulled or released, the line segment of the shift cable 2 between the wire nozzle 13 and the winding groove 711 always maintains the same length and posture. Assuming that the winding groove 711 rotates a certain angle, the shift cable 2 just pulls or releases the arc length corresponding to the angle on the winding groove 711, and the angle of rotation of the winding groove 711 can correspond to the distance that the sprocket 4 moves along its axial direction. Therefore, the length of the shift cable 2 required to pull or release each gear shift of the finger-shift transmission can be easily designed according to the axial distance between different flywheels.

[0043] Reference Figure 5 In some embodiments, an avoidance groove 51 is opened on the side of the inner swing block 5 facing the winding portion 71. When the distance between the inner swing block 5 and the outer swing block 6 is the shortest, the winding portion 71 extends into the avoidance groove 51, and the bottom of the avoidance groove 51 and the winding groove 711 are enclosed to form a first threading channel 9. In this way, the internal space of the parallel four-bar linkage can be maximized, so that the pulling radius of the shift cable 2 relative to the second pivot 12 can be designed to be maximized, that is, the rotation radius of the winding groove 711 around the second pivot 12 can be designed to be maximized, and the cable pulling ratio of the bicycle can be improved. The cable pulling ratio is specifically the ratio of the distance the shift cable 2 is moved by the finger-shift transmission to the actual distance the derailleur wheel 4 moves along the axial direction of the flywheel. This reduces the manual force required for the shifting operation, and after taking into account the error conversion, it can also improve the shifting accuracy.

[0044] In some embodiments, reference Figure 5 and Figure 7 The winding portion 71 includes a wire threading flare 712, which is connected to the end of the winding groove 711 away from the wire clamping portion 72. The wire threading flare 712 gradually expands in the direction close to the wire nozzle 13 and gradually shrinks in the direction close to the winding groove 711. The first wire threading channel 9 extends from the wire threading flare 712 to the wire clamping portion 72, and can smoothly guide the shift cable 2 that passes through the wire nozzle 13 into the first wire threading channel 9.

[0045] Reference Figure 6 and Figure 7 In some embodiments, the wire clamping portion 72 includes a positioning block 721, a pressing block 722 and a fastener 723. The positioning block 721 is fixedly installed on the wiring frame 7. The pressing block 722 can be fastened to the positioning block 721 through the fastener 723. The pressing block 722 is configured to cooperate with the positioning block 721 to clamp the shift wire 2. The fastener 723 can specifically be a screw. The pressing block 722 has a corresponding through hole, and the positioning block 721 has an internal threaded hole. The fastener 723 passes through the through hole and is threadedly connected to the internal threaded hole to clamp the shift wire 2 between the pressing block 722 and the positioning block 721.

[0046] Reference Figure 6 and Figure 7 In some embodiments, a side stopper 724 is provided on the pressure block 722 at one end away from the fastener 723 and extending toward the positioning block 721. Before the pressure block 722 and the positioning block 721 clamp the shift cable 2, a second threading channel 10 is defined between the positioning block 721, the side stopper 724, the pressure block 722 and the fastener 723, and the second threading channel 10 can allow the shift cable 2 to pass through.

[0047] Among them, the axial direction of the sprocket 4 extends in the left and right directions so that the extension plane of the sprocket 4 remains parallel to the flywheel, and the second pivot 12 and the third pivot 31 are both perpendicular to the axial direction of the sprocket 4, so that the outer swing block 6 is roughly in a vertical state, and the axial direction of the fastener 723 is not parallel to the axial direction of the second pivot 12. The second threading channel 10 starts to extend downward or upward from one end close to the winding part 71. When the shift cable 2 passes through the second threading channel 10, it also tilts downward or upward, and can directly pass through the parallel four-bar linkage mechanism downward or upward, or bend downward or upward after contacting the outer swing block 6 and pass through the parallel four-bar linkage mechanism. The shift cable 2 passing through the parallel four-bar linkage mechanism provides an operating space for the user, so that the user can clamp the end of the shift cable 2 and tighten the shift cable 2, and then tighten the fastener 723 to clamp the shift cable 2 with the pressure block 722 and the positioning block 721, so as to facilitate the installation of the shift cable 2.

[0048] In some embodiments, reference Figure 7 The positioning block 721 is provided with an anti-slip groove 725 on the side facing the pressure block 722. The anti-slip groove 725 is configured to cooperate with the pressure block 722 to clamp the shift cable 2. Once the shift cable 2 is clamped between the anti-slip groove 725 and the pressure block 722, the anti-slip groove 725 can accommodate part of the shift cable 2 to constrain the shift cable 2 and prevent the shift cable 2 from deviating from the positioning block 721, ensuring that the shift cable 2 will not deviate from both sides of the extension direction of the anti-slip groove 725.

[0049] In some embodiments, a plurality of protrusions 726 are provided in the anti-slip groove 725 at intervals along the extension direction. Figure 7The protrusion 726 extends from the bottom of the anti-slip groove 725 toward the pressure block 722 but does not exceed the opening of the anti-slip groove 725. Once the shift cable 2 is clamped between the anti-slip groove 725 and the pressure block 722, the protrusion 726 provides friction force to the shift cable 2 along the extension direction of the anti-slip groove 725, ensuring that the shift cable 2 will not move relatively along the extension direction of the anti-slip groove 725.

[0050] In some embodiments, reference Figure 3 The elastic reset member 8 is a tension spring, and the elastic reset member 8 is arranged between the fourth pivot 32 and the position of the outer swing block 6 that deviates from the third pivot 31. It should be noted that in the entire process of the parallel four-bar linkage moving from another extreme position to one of the extreme positions, that is, Figure 4 The state shown moves to Figure 2 During the entire process of the shown state, the elastic return member 8 is gradually stretched. Then, when the shift cable 2 is released by the finger-shift transmission, the elastic return member 8 has a tendency to pull back and recover, forcing the fourth pivot 32 to approach the outer swing block 6, that is, the outer swing block 6 and the inner swing block 5 both rotate along the second rotation direction, so as to achieve the purpose of reset and keep the shift cable 2 always in a tensioned state.

[0051] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A compact rear derailleur, characterized in that: Having a first rotation direction and a second rotation direction that are opposite, comprising: A base member configured to be mounted on a vehicle frame, wherein the base member is sequentially mounted with a first pivot, a wire nozzle, and a second pivot in a left-right direction, wherein the wire nozzle is used for passing a shift cable; A movable member is rotatably connected to a derailleur wheel on the left side, and a fourth pivot and a third pivot are sequentially mounted on the movable member along the left-right direction, wherein the axes of the first pivot, the second pivot, the third pivot and the fourth pivot are parallel to each other; an inner swing block, a front end of which is hinged to the movable member via the fourth pivot, and a rear end of which is hinged to the base member via the first pivot; The outer swing block has a front end hinged to the movable member via the third pivot, and a rear end hinged to the base member via the second pivot, wherein the base member, the inner swing block, the movable member and the outer swing block form a parallel four-bar linkage mechanism; a wiring frame, mounted on a side of the outer swing block facing the inner swing block and accommodated in the parallel four-bar linkage, the wiring frame being provided with a winding portion and a wire clamping portion, the shift wire being clamped on the wire clamping portion after passing around the winding portion, and the shift wire being able to pull the outer swing block to rotate about the second pivot in a first rotation direction; The elastic return member is configured to apply a torque to the outer swing block to rotate around the second pivot along the second rotation direction.

2. The compact rear derailleur according to claim 1, wherein: The winding portion includes a winding groove arranged on the outer edge of the wiring frame, the extension trajectory of the winding groove is a curve and is perpendicular to the axial direction of the second pivot, the opening of the winding groove is away from the second pivot, and when the distance between the inner swing block and the outer swing block is the shortest, the inner swing block and the winding groove define a first wire threading channel for the shift wire to pass through, and the first wire threading channel extends to the wire clamping portion.

3. The compact rear derailleur according to claim 2, wherein: The extension track of the winding groove is an arc line with the second pivot as the center.

4. The compact rear derailleur according to claim 2, wherein: An avoidance groove is provided on one side of the inner swing block toward the winding portion. When the distance between the inner swing block and the outer swing block is the shortest, the winding portion extends into the avoidance groove, and the bottom of the avoidance groove and the winding groove are combined to form the first threading channel.

5. The compact rear derailleur according to claim 2, wherein: The wire winding portion includes a wire threading flare, the wire threading flare is connected to an end of the wire winding groove away from the wire clamping portion, and the first wire threading channel extends from the wire threading flare to the wire clamping portion.

6. The compact rear derailleur according to claim 1, wherein: The wire clamping portion includes a positioning block, a pressing block and a fastener. The positioning block is fixedly mounted on the wiring frame. The pressing block can be fastened to the positioning block through the fastener. The pressing block is configured to cooperate with the positioning block to clamp the shift wire.

7. The compact rear derailleur according to claim 6, wherein: A side stopper is provided on the pressure block at one end away from the fastener and extending toward the positioning block. Before the pressure block and the positioning block clamp the shift cable, a second threading channel is defined between the positioning block, the side stopper, the pressure block and the fastener. The axial direction of the sprocket extends in the left and right directions, the axial direction of the second pivot is perpendicular to the axial direction of the sprocket, the axial direction of the fastener is not parallel to the axial direction of the second pivot, and the second threading channel extends downward or upward from one end close to the winding portion.

8. The compact rear derailleur according to claim 6, wherein: The positioning block is provided with an anti-slip groove on one side facing the pressure block. The anti-slip groove is configured to cooperate with the pressure block to clamp the shift wire. The anti-slip groove can accommodate part of the shift wire to prevent the shift wire from deviating from the positioning block.

9. The compact rear derailleur according to claim 8, wherein: A plurality of protrusions are arranged at intervals in the anti-slip groove along the extension direction. The protrusions extend from the bottom of the anti-slip groove toward the pressing block protrusion but do not exceed the opening of the anti-slip groove.

10. The compact rear derailleur according to claim 1, wherein: The outer swing block is provided with a first stopper, and the base component is provided with a second stopper. When the parallel four-bar linkage is in one of the extreme positions, the second stopper stops the wiring frame, and when the parallel four-bar linkage is in the other extreme position, the first stopper stops the movable component.

11. The compact rear derailleur according to claim 1, wherein: The elastic reset member is a tension spring, and the elastic reset member is arranged between the fourth pivot and a position on the outer swing block that deviates from the third pivot.

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