Chain derailleur and bicycle

Abstract

The application relates to a derailleur and a bicycle. The derailleur comprises a fixed seat, a guide rod, a sliding assembly, a first elastic member and a derailleur assembly. The fixed seat has a fixed part which is configured to be mounted on a rear wheel shaft or a frame, and the rear wheel shaft or the frame is also used for mounting a variable speed gear disc with a first axis as its own axis. The guide rod has a second axis as its own axis and is fixedly connected to the fixed seat. The second axis is configured to be arranged at an acute angle with the first axis, and the guide rod and the fixed part are located on the same side of the fixed seat in the direction of the first axis. The guide rod is provided with a rotation stopping part. The sliding assembly comprises a guide wheel seat which is movably sleeved on the guide rod along the second axis and is connected with the rotation stopping part. The rotation stopping part prevents the guide wheel seat from rotating around the second axis. The derailleur assembly is configured to be rotatably mounted on the guide wheel seat in a first direction parallel to the first axis and is used for tensioning a chain on the variable speed gear disc. The derailleur transmission structure is simple and reliable and will not be stuck in gear shifting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycles, in particular to a derailleur and a bicycle. BACKGROUND

[0002] The derailleur of a bicycle is mounted on the rear fork of the bicycle frame and cooperates with the gear disc installed on the rear wheel of the bicycle. The derailleur drives the chain to engage with the gear disc of different diameters through the chain derailleur to achieve gear shifting of the bicycle. At present, most of the derailleurs of bicycles adopt four-bar mechanisms for chain shifting. Such transmission structure is complex, and the riveting point is prone to jamming during gear shifting, which causes the derailleur to fail to shift. SUMMARY

[0003] Therefore, it is necessary to provide a derailleur and a bicycle to improve the above-mentioned defects in view of the problem that the derailleur of the prior art is prone to jamming during gear shifting.

[0004] A derailleur, comprising:

[0005] A fixed seat having a fixed part configured to be mounted on a rear wheel shaft or a frame, the rear wheel shaft or the frame also being used to mount a gear disc with a first axis as its own axis;

[0006] A guide rod with a second axis as its own axis and being fixedly connected to the fixed seat, the second axis being configured to be arranged at an acute angle with the first axis, and the guide rod and the fixed part being located on the same side of the fixed seat in the direction of the first axis, the guide rod having a rotation-stopping part thereon;

[0007] A sliding assembly comprising a guide wheel seat movably sleeved on the guide rod along the second axis and being connected to the rotation-stopping part, the rotation-stopping part preventing the guide wheel seat from rotating around the second axis; and

[0008] A chain derailleur configured to be rotatably mounted on the guide wheel seat in a first direction parallel to the first axis for tensioning the chain on the gear disc.

[0009] In one embodiment, a circumferential surface of the guide rod serves as the rotation-stopping part, at least part of the circumferential surface is not parallel to a cylindrical surface with the second axis as the central axis, and the guide wheel seat has a matching surface fitted with the circumferential surface.

[0010] In one embodiment, the guide rod comprises a rod body and a rotation-stopping part, one end of the rod body is fixedly connected to the fixed seat, and the other end extends along the second axis;

[0011] The rod body has a sliding slot, which is arranged along the second axis and penetrates the rod body along a second direction perpendicular to the second axis; the rotation-stopping member penetrates the sliding slot and connects the guide wheel base.

[0012] In one embodiment, the guide wheel base is configured to move along a third direction on the second axis under the action of the cable;

[0013] The derailleur further comprises a first elastic member, which is arranged on the guide rod and configured to provide an elastic force for moving the guide wheel base along a fourth direction opposite to the third direction.

[0014] In one embodiment, the derailleur has a cable mounting portion for mounting the cable, and the fixed base is provided with a cable guide hole for the cable to penetrate;

[0015] The cable guide hole is used to guide the cable to apply a pulling force parallel to the second axis to the cable mounting portion; and the cable mounting portion drives the guide wheel base to move under the pulling force.

[0016] In one embodiment, the cable mounting portion is protruded from the outer surface of the guide wheel base.

[0017] In one embodiment, the sliding assembly further comprises a rocker arm; the rocker arm has a hinge portion and a connecting portion in the extending direction of the rocker arm, the hinge portion is hinged to the fixed base, and the hinge axis of the hinge portion is perpendicular to the second axis, the connecting portion is rotatably and movably connected to the guide wheel base around the hinge axis and in the extending direction of the rocker arm;

[0018] The cable mounting portion is arranged on the rocker arm, and in the extending direction of the rocker arm, the hinge portion is located between the cable mounting portion and the connecting portion.

[0019] In one embodiment, the sliding assembly further comprises a spring base, which is movably sleeved on the guide rod along the second axis, and the first elastic member is limited between the spring base and one end of the guide rod in the second axis direction;

[0020] The spring base is configured to move synchronously with the guide wheel base, and the first elastic member generates the elastic force during the movement of the spring base.

[0021] In one embodiment, the guide rod comprises a rod body and a rotation-stopping member as a rotation-stopping portion, and one end of the rod body is fixedly connected to the fixed base;

[0022] The rod body has a through slot along the second axis and a sliding slot along a second direction perpendicular to the second axis, the sliding slot extends along the second axis; the spring seat is arranged in the through slot, the anti-rotation member penetrates the sliding slot and connects the spring seat and the guide wheel seat.

[0023] In one embodiment, the guide rod further comprises a pulley seat, a first pulley and a second pulley, the pulley seat is fixed to an end of the rod body away from the fixed seat, the first pulley and the second pulley are arranged in the pulley seat, the first elastic member is limited between the spring seat and the pulley seat;

[0024] The cable mounting portion is arranged on the spring seat, the cable guide hole, the first pulley, the second pulley and the cable mounting portion are sequentially arranged on the extension path of the cable; the cable between the first pulley and the cable mounting portion and the cable between the second pulley and the cable guide hole are parallel to the second axis.

[0025] In one embodiment, the derailleur mechanism has an elastic portion, the elastic portion is drivingly connected to the derailleur assembly; the elastic portion provides an elastic torque to tension the chain.

[0026] In one embodiment, the sliding assembly further comprises a first spring seat sleeved with the guide rod, the first spring seat is rotatably arranged on the guide wheel seat around the second axis and drivingly connected to the derailleur assembly, the derailleur assembly rotates synchronously with the first spring seat;

[0027] The first elastic member serves as the elastic portion, one end of the first elastic member is fixedly connected to the fixed seat, the other end is configured to rotate synchronously with the first spring seat; the first elastic member provides the elastic torque to the first spring seat, the first spring seat drives the derailleur assembly to rotate and tension the chain under the action of the elastic torque.

[0028] In one embodiment, the derailleur mechanism further comprises a second elastic member as the elastic portion, the second elastic member is arranged on the guide wheel seat, the second elastic member has a central axis, the central axis coincides with the first direction;

[0029] One end of the second elastic member on the central axis is fixedly arranged relative to the guide wheel seat, the other end is connected to the derailleur assembly and provides an elastic torque to tension the chain.

[0030] In one embodiment, the derailleur assembly includes a guide wheel frame, a first guide wheel, and a second guide wheel. The first guide wheel and the second guide wheel are respectively disposed at opposite ends of the guide wheel frame in a fifth direction perpendicular to the first axis, and the axes of the first guide wheel and the second guide wheel are arranged parallel to each other. The guide wheel frame is rotatably mounted on the guide wheel seat synchronously with the first guide wheel around the first direction.

[0031] The first guide wheel and the second guide wheel are used to engage with the chain; the elastic part is connected to the guide wheel frame for transmission.

[0032] In one embodiment, a dust cover is further included, which is fitted over the outside of the guide rod and configured to be controllably telescopic along the second axis; one end of the dust cover is fixed relative to the guide rod, and the other end is connected to the guide wheel seat, and the dust cover telescopically extends and retracts as it moves with the guide wheel seat.

[0033] A bicycle including a derailleur mechanism as described in any of the above embodiments.

[0034] The aforementioned derailleur mechanism uses only one guide rod with an anti-rotation component. The guide wheel seat moves along the guide rod without rotating, allowing the chain to switch between different gear levels during movement. Its transmission structure is simple and reliable, preventing guide wheel seat jamming during gear shifting and effectively avoiding derailleur failure. Furthermore, the second axis of the guide rod is arranged at an acute angle to the first axis, resulting in a smaller overall size and contributing to the miniaturization of the derailleur assembly. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the installation of the derailleur mechanism in the first embodiment of this application;

[0036] Figure 2 for Figure 1 Top view of the structure shown;

[0037] Figure 3 for Figure 1 A three-dimensional view of the structure shown;

[0038] Figure 4 for Figure 1 An exploded view of the structure shown;

[0039] Figure 5 This is a schematic diagram of the installation of the derailleur mechanism in the second embodiment of this application;

[0040] Figure 6 for Figure 5 Top view of the structure shown;

[0041] Figure 7 forFigure 5 Another view of the structure shown in FIG. 1;

[0042] Figure 8 An exploded view of the structure shown in FIG. 1; Figure 5 Another view of the structure shown in FIG. 1;

[0043] Figure 9 An installation schematic of the chain shifting mechanism in the third embodiment of the present application;

[0044] Figure 10 Another view of the structure shown in FIG. 1; Figure 9 Another view of the structure shown in FIG. 1;

[0045] Figure 11 Another view of the structure shown in FIG. 1; Figure 9 Another view of the structure shown in FIG. 1;

[0046] Figure 12 Another view of the structure shown in FIG. 1; Figure 9 Another view of the structure shown in FIG. 1;

[0047] Figure 13 An exploded view of the structure shown in FIG. 1; Figure 9 Another view of the structure shown in FIG. 1;

[0048] Figure 14 An installation schematic of the chain shifting mechanism in the fourth embodiment of the present application;

[0049] Figure 15 Another view of the structure shown in FIG. 1; Figure 14 Another view of the structure shown in FIG. 1;

[0050] Figure 16 A sectional view of the structure shown in FIG. 1; Figure 14

[0051] An enlarged view of A in FIG. 1; Figure 17 Figure 16

[0052] Explanation of reference numerals:

[0053] 100, chain shifting mechanism;

[0054] 110, fixed seat; 111, fixed part; 112, cable guide hole; 113, connecting arm;

[0055] 120, guide rod; 121, sleeve surface; 122, rod body; 123, sliding groove; 124, through groove; 125, rotation stopper; 126, pulley seat; 127, first pulley; 128, second pulley; 129, bushing;

[0056] ​​130, sliding assembly; 131, guide wheel seat; 132, spring seat; 1321, first spring seat; 133, bracket; 134, joint bearing seat; 135, joint bearing; 136, rocker arm; 1361, hinged part; 1362, connecting part; 130a, cable mounting part;

[0057] 140, derailleur assembly; 141, guide wheel bracket; 1411, first bracket body; 1412, second bracket body; 142, first guide wheel; 143, second guide wheel;

[0058] 150, first elastic member; 151, flat hook; 152, straight hook;

[0059] 160, second elastic member;

[0060] 170, dust cover; 171, first cover body; 172, second cover body;

[0061] 200, gear shifting disc;

[0062] 300, cable. DETAILED DESCRIPTION

[0063] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all such modifications and variations of the specific embodiments disclosed herein. Therefore, the scope of the present application should be governed by the appended claims rather than by the description of the specific embodiments presented herein.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0066] In the present application, unless specifically stated and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and "fixing" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless specifically stated and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0068] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0069] For the convenience of understanding the description, the structure of the bicycle is introduced first. The bicycle generally comprises a frame, a front wheel, a rear wheel, a handlebar, a derailleur, a cable, a shifter, a chain, a pedal, a transmission gear, a derailleur mechanism and the like. The rear wheel is installed at the rear side of the frame, the front wheel is installed at the front side of the frame, the handlebar is located above the front side of the frame, the shifter is installed on the handlebar, the derailleur is installed on the rear wheel shaft (fixed to the frame) of the rear wheel, the pedal is installed below the middle part of the frame, the transmission gear is installed on the pedal shaft of the pedal, and the derailleur mechanism is coaxially installed on the rear wheel shaft of the derailleur. The chain is installed on the derailleur mechanism, the derailleur and the transmission gear to realize the transmission connection of the three. One end of the cable is connected to the shifter, and the other end is connected to the derailleur mechanism. Among them, the derailleur comprises a plurality of coaxially arranged gear stages, and the diameter of each gear stage gradually decreases in the direction away from the rear wheel. When the operator operates the shifter once, the shifter tightens or loosens a unit length of the cable. When the cable is tightened by a unit length, the derailleur mechanism drives the chain to switch to the adjacent gear stage in the forward direction, and the gear position is reduced. When the cable is loosened by a unit length, the derailleur mechanism drives the chain to switch to the adjacent gear stage in the reverse direction, and the gear position is increased. The derailleur mechanism tightens the chain after the position of the chain is switched, and the gear shifting is completed.

[0070] The derailleur 100 provided in the present application is described in detail below.

[0071] Please refer to Figure 1 , Figure 2 and Figure 3 , an embodiment of the present application provides a derailleur 100, which comprises a fixed seat 110, a guide rod 120, a sliding assembly 130, a first elastic member 150 and a derailleur assembly 140. The fixed seat 110 has a fixed part 111 which is configured to be installed on the rear wheel shaft or the frame, and the rear wheel shaft or the frame is also used to install the derailleur with the first axis as its own axis. The guide rod 120 has the second axis as its own axis, is fixedly connected to the fixed seat 110, and the second axis is configured to be arranged at an acute angle with the first axis, and the guide rod 120 and the fixed part 111 are located on the same side of the fixed seat 110 in the direction of the first axis, and the guide rod 120 has a rotation stopping part. The sliding assembly 130 comprises a guide wheel seat 131 which is movably sleeved on the guide rod 120 along the second axis and is connected with the rotation stopping part, and the rotation stopping part prevents the guide wheel seat 131 from rotating around the second axis. The derailleur assembly 140 is configured to be rotatably installed on the guide wheel seat 131 in the first direction parallel to the first axis, and is used to tighten the chain on the derailleur 200.

[0072] When the user adjusts the gear to a lower position, the guide wheel seat 131 is controlled to move along the guide rod 120 in the second axis by a certain distance, and the chain shifting assembly 140 moves forward along with the guide wheel seat 131, and since the second axis of the guide rod 120 is at an acute angle with the first axis, when the guide wheel seat 131 moves forward, it has a forward component displacement in the direction of the first axis, so that the chain shifting assembly 140 moves forward by a forward component displacement, so that the chain is switched to a small-diameter gear ring adjacent in the forward direction, and the gear gradually becomes smaller. The diameters of the gear rings of the gear rings of the gear shifting gear ring 200 gradually decrease in the forward direction (that is, the closer to the fixed seat 110, the smaller the diameter of the gear ring, and the smaller the gear), and the guide wheel seat 131 also has a tangential component displacement in the direction perpendicular to the first axis, so that the chain shifting assembly 140 gradually approaches the rear wheel shaft when moving forward, so that the length of the chain between the chain shifting assembly 140 at each position and the corresponding gear ring is basically the same, so that the chain between the gear ring and the chain shifting assembly 140 is not too long or too short, and the chain shifting assembly 140 can smoothly tension the chain. When the user adjusts the gear to a higher position, the guide wheel seat 131 is controlled to move in the second axis in the reverse direction, so that the chain shifting assembly 140 moves in the reverse direction, so that the chain is switched to a large-diameter gear ring adjacent in the reverse direction, and the gear gradually becomes larger.

[0073] Compared with the prior art, the chain shifting mechanism 100 provided in the application only needs to be provided with one guide rod 120 and a rotation stopping part on the guide rod 120, the guide wheel seat 131 only moves along the guide rod 120 without rotating, and the guide wheel seat 131 can realize the switching of the chain between the gear rings in the process of moving, the transmission structure is simple, the transmission reliability is good, and the phenomenon of the guide wheel seat 131 being stuck during gear shifting is avoided, thereby effectively avoiding the problem that the chain shifting mechanism 100 cannot smoothly shift the chain. At the same time, the second axis of the guide rod 120 is arranged at an acute angle with the first axis, so that the whole chain shifting mechanism has a small volume, which is helpful for miniaturizing the chain shifting assembly 140.

[0074] It can be understood that when the chain is in the first gear ring, the mounting plane of the chain on the chain shifting assembly 140 is parallel to the disc surface of the first gear ring, and when the chain is switched to the second gear ring adjacent to the first gear ring, the chain shifting assembly 140 moves along with the guide wheel seat 131 to a position where the mounting plane of the chain is parallel to the disc surface of the second gear ring.

[0075] It should be emphasized that in the chain shifting mechanism 100 provided in the application, the number of guide rods 120 is only one, and the rotation stopping part of the guide rod 120 prevents the guide wheel seat 131 from rotating around the guide rod 120, thereby avoiding the problem that the chain cannot be smoothly shifted due to the fact that the chain shifting assembly 140 cannot be parallel to the disc surface of the gear ring. By only providing one guide rod 120, the structure of the chain shifting mechanism 100 is greatly simplified, and the fewer components, the smaller the probability of being stuck, and this structure can significantly improve the problem of gear shifting being stuck.

[0076] Preferably, referring to Figure 7 and Figure 9 , the fixing seat 110 comprises a seat body and a hook provided on the seat body, the hook is formed with a clamping opening arranged along the first axis, the clamping opening of the hook can be tightly clamped on the rear wheel shaft, at this time, the hook is configured as the fixing part 111, which is convenient for disassembly. Of course, the fixing part 111 is not limited to the above structure, as long as the fixing part 111 can be installed on the rear wheel shaft, which will not be described here.

[0077] Preferably, the guide wheel seat 131 is sleeved on the outside of the guide rod 120, which is convenient for layout and simplifies the whole structure.

[0078] In order to realize that the guide wheel seat 131 can only move along the guide rod 120, there are various ways to configure the rotation stopping part.

[0079] In some embodiments, referring to Figures 2 to 4 and Figures 9 to 13 , the circumferential surface of the guide rod 120 is used as the rotation stopping part, the circumferential surface of the guide rod 120 is at least partially not parallel to the cylindrical surface with the second axis as the central axis, and the guide wheel seat 131 has a matching surface that is fitted with the circumferential surface of the guide rod 120. At this time, the circumferential surface of the guide rod 120 is used to hinder the rotation of the guide wheel seat 131. Among them, there are various ways to configure the circumferential surface of the guide rod 120. For example, the circumferential surface of the guide rod 120 is a special-shaped cross section, a polygonal cross section, or the circumferential surface of the guide rod 120 is partially protruding or partially recessed, etc. Specifically, the cross section of the sleeving surface 121 is a hexagonal cross section.

[0080] In a further optional embodiment, the sliding assembly 130 further comprises a bushing 129, the bushing 129 is sleeved between the guide rod 120 and the guide wheel seat 131, the inner wall (or the outer wall) of the bushing 129 is in contact with the circumferential surface of the guide rod 120, and the outer wall (or the inner wall) of the bushing 129 is tightly matched with the guide wheel seat 131 or is in tight contact through fasteners. For example, the bushing 129 is a hexagonal cross section. The provision of the bushing 129 helps to reduce the cost of replacing parts of the derailleur 100.

[0081] Understandably, the circumferential surface of the guide rod 120 can be the circumferential outer surface of the guide rod 120 (at this time the guide wheel seat 131 is sleeved on the outside of the guide rod 120), or the guide rod 120 has a circumferential inner surface (at this time the guide rod 120 is sleeved on the outside of the guide wheel seat 131).

[0082] In another embodiment, referring to Figures 5 to 8 and Figures 14 to 17The guide rod 120 includes a rod body 122 and an anti-rotation member 125 as an anti-rotation part. One end of the rod body 122 is fixed to the fixed seat 110, and the other end extends along the second axis. The rod body 122 has a sliding groove 123 extending along the second axis and penetrating the rod body 122 along a second direction perpendicular to the second axis. The anti-rotation member 125 penetrates the sliding groove 123 and is connected to the guide wheel seat 131.

[0083] For example, the guide wheel seat 131 is sleeved outside the guide rod 120. The anti-rotation member 125 is connected to the guide wheel seat 131 and penetrates the sliding groove 123. When the guide wheel seat 131 moves along the second axis, the anti-rotation member 125 is driven to move in the sliding groove 123. At the same time, the anti-rotation member 125 cannot rotate around the second axis under the limitation of the sliding groove 123, thereby hindering the guide wheel seat 131 from rotating around the second axis, so that the guide wheel seat 131 can only move along the guide rod 120. The anti-rotation member 125 can be a pin shaft, and the extension length of the sliding groove 123 can be set according to the maximum movement requirement of the guide wheel seat 131. Alternatively, the anti-rotation member 125 abuts against the sliding groove 123 in a direction perpendicular to the second axis and the second direction, so as to be limited by the sliding groove 123 and cannot rotate.

[0084] In other embodiments, the circumferential surface of the guide rod 120 can be an anti-rotation part, or can include the anti-rotation member 125 described above. Of course, the guide rod 120 can also adopt other ways to construct the anti-rotation part, which is not limited in particular.

[0085] In some embodiments, the guide wheel seat 131 is configured to move along a third direction on the second axis under the action of the cable 300. Please refer to Figures 1 to 13 and Figure 16 The derailleur 100 further includes a first elastic member 150 arranged on the guide rod 120 and configured to provide an elastic force for moving the guide wheel seat 131 in a fourth direction opposite to the third direction.

[0086] In actual operation, when the user adjusts the low gear, the user operates the gear shifter to tighten a unit length of the cable 300. The cable 300 pulls the guide wheel seat 131 to move a certain distance along the guide rod 120 in the third direction, and the derailleur assembly 140 moves forward with the guide wheel seat 131. When adjusting the high gear, the user operates the gear shifter to loosen a unit length of the cable 300 each time. Since the tension of the cable 300 acting on the guide wheel seat 131 disappears, the guide wheel seat 131 moves a certain unit length of distance in the fourth direction under the action of the elastic force provided by the first elastic member 150, so that the derailleur assembly 140 moves reversely, so that the chain is switched to a reverse adjacent gear with a larger diameter, and the gear gradually increases.

[0087] At this time, the cable 300 and the first elastic member 150 provide power for the movement of the guide wheel seat 131. Of course, in other embodiments, the driving member such as a motor can be controlled by a controller to drive the guide wheel seat 131 to move, but the economy is not high.

[0088] It should be noted that the above is only to deduce the process of the derailleur 100 completing the gear shifting in the third direction corresponding to the positive direction of the gradually decreasing gear position and the fourth direction corresponding to the reverse direction of the gradually increasing gear position, but it is not a limitation on the gear shifting mode. The positive direction of the gradually decreasing gear position can also be corresponding to the fourth direction, and the reverse direction of the gradually increasing gear position can be corresponding to the third direction.

[0089] In some embodiments, please refer to Figures 1 to 4 , Figure 7 and Figure 10 The derailleur 100 has a cable mounting portion 130a for mounting the cable 300, and the fixed seat 110 is provided with a cable guide hole 112 for the cable 300 to pass through. The cable guide hole 112 is used to guide the cable 300 to act on the cable mounting portion 130a with a pulling force parallel to the second axis. The cable mounting portion 130a drives the guide wheel seat 131 to move under the pulling of the pulling force.

[0090] At this time, the cable 300 extends from the gear shifter, passes through the cable guide hole 112 first, and is then mounted on the cable mounting portion 130a. Under the guidance of the cable guide hole 112, the pulling force of the cable 300 acting on the guide wheel seat 131 is parallel to the second axis, which can make the guide wheel seat 131 move more smoothly, and further avoid the problem of gear shifting jam.

[0091] In an embodiment, please refer to Figures 1 to 4 , the cable mounting portion 130a is protruded on the outer surface of the guide wheel seat 131. At this time, the pulling force of the cable 300 directly acts on the guide wheel seat 131. In this way, the overall structure of the derailleur 100 is simple, easy to manufacture and assemble. In actual operation, when the cable 300 is tightened, the guide wheel seat 131 is pulled by the cable 300 to gradually approach the fixed seat 110. When the gear shifter tightens the cable 300, the guide wheel seat 131 is pulled by the cable 300 to gradually approach the fixed seat 110. At this time, the third direction corresponds to the positive direction in the moving direction of the derailleur assembly 140, that is, as the cable 300 is tightened, the chain is switched to the sprocket with a smaller diameter, and the gear position becomes smaller.

[0092] In a further embodiment, the first elastic member 150 is sleeved on the outside of the guide rod 120, and one end of the first elastic member 150 is connected to the fixed seat 110, and the other end of the first elastic member 150 is connected to the guide wheel seat 131, and the first elastic member 150 generates an elastic force for moving the guide wheel seat 131 in the fourth direction in the process of being compressed. At this time, the first elastic member 150 can be a compression spring. At this time, the whole structure is simple, and the movement is reliable.

[0093] In another embodiment, referring to Figures 5 to 8 , the sliding assembly 130 further comprises a rocker arm 136, the rocker arm 136 has a hinged portion 1361 and a connecting portion 1362 in the extending direction of the rocker arm 136, the hinged portion 1361 is hinged to the fixed seat 110, and the hinged axis of the hinged portion 1361 is perpendicular to the second axis, and the connecting portion 1362 is rotatably and movably connected to the guide wheel seat 131 in the extending direction of the rocker arm 136. The cable mounting portion 130a is provided on the rocker arm 136, and in the extending direction of the rocker arm 136, the hinged portion 1361 is located between the cable mounting portion 130a and the connecting portion 1362.

[0094] At this time, the rocker arm 136 is hinged to the fixed seat 110 through the hinged portion 1361 of the rocker arm 136, and is movable in the extending direction of the rocker arm 136 relative to the guide wheel seat 131 through the connecting portion 1362 of the rocker arm 136. The cable mounting portion 130a is provided on the rocker arm 136, and the tension provided by the cable 300 first acts on the rocker arm 136, and the rocker arm 136 rotates around the hinged axis of the hinged portion 1361, at this time the connecting portion 1362 follows the rotation, in the process of the rotation of the connecting portion 1362, a component displacement in the direction parallel to the second axis is generated, under the action of the component displacement, the guide wheel seat 131 moves along the guide rod 120. At the same time, since the rotating portion also generates a component displacement in the direction perpendicular to the second axis and the hinged axis in the process of the rotation, since the guide wheel seat 131 cannot move in the direction following the connecting portion 1362, the connecting portion 1362 is further provided to be movable in the extending direction of the rocker arm 136, so as to avoid the motion interference between the connecting portion 1362 and the guide wheel seat 131.

[0095] In a further embodiment, the fixed seat 110 comprises a seat body and a connecting arm 113 protruding from the seat body, the guide rod 120 is connected to the seat body, the hinged portion 1361 is hinged to the connecting arm 113, and the connecting arm 113 has a cable guide hole 112, the cable guide hole 112 is located between the seat body and the cable mounting portion 130a.

[0096] In the embodiment, when the shift cable 300 is pulled, the cable mounting portion 130a rotates towards the seat body, and the connecting portion 1362 rotates away from the seat body, and the guide rod 120 is driven to move away from the seat body. At this time, the third direction is opposite to the moving direction of the derailleur assembly 140, that is, when the shift cable 300 is pulled, the chain is switched to the sprocket with larger diameter, and the gear is increased.

[0097] Further, one end of the first elastic member 150 is connected to the end of the guide rod 120 close to the seat body, and the other end of the first elastic member 150 is connected to the guide pulley seat 131. When the first elastic member 150 is pulled, the first elastic member 150 provides an elastic force to drive the guide pulley seat 131 to move in the fourth direction.

[0098] At this time, when the guide pulley seat 131 moves away from the seat body along with the connecting portion 1362, the first elastic member 150 is stretched, and the first elastic member 150 provides an elastic force to drive the guide pulley seat 131 to move in the fourth direction. The first elastic member 150 can be a tension spring or the like. Of course, in other embodiments, the first elastic member 150 can also be arranged as follows: one end of the first elastic member 150 is connected to the end of the guide rod 120 away from the seat body, and the other end of the first elastic member 150 is connected to the guide pulley seat 131. When the first elastic member 150 is compressed, the first elastic member 150 provides an elastic force to drive the guide pulley seat 131 to move in the fourth direction.

[0099] In a specific embodiment, the sliding assembly 130 includes the rocker arm 136 in the above embodiment, the rotation stopping member 125 in the above embodiment as the rotation stopping portion, and the connecting portion 1362 as a strip-shaped hole. The length direction of the strip-shaped hole is along the extension direction of the rocker arm 136. The rotation stopping member 125 also connects the guide pulley seat 131 and the strip-shaped hole. At this time, the connecting portion 1362 of the rocker arm 136 is connected to the guide pulley seat 131 through the rotation stopping member 125. That is, the rotation stopping member 125 can simultaneously connect the guide pulley seat 131, the rocker arm 136 and the guide rod 120, which helps to reduce the number of parts, the assembly difficulty and the cost of parts.

[0100] Of course, the structure of the connecting portion 1362 is not limited to the strip-shaped hole. For example, a strip-shaped hole is arranged on the guide pulley seat 131, and the connecting portion 1362 is a connecting protrusion. The connecting protrusion is arranged in the strip-shaped hole and can move and rotate along the strip-shaped hole.

[0101] In some embodiments, the sliding assembly 130 further includes a spring seat 132 movably sleeved on the guide rod 120 along the second axis, and the first elastic member 150 is limited between the spring seat 132 and one end of the guide rod 120 in the second axis direction. The spring seat 132 is configured to move synchronously with the guide pulley seat 131, and the first elastic member 150 generates the above-mentioned elastic force in the process of moving the spring seat 132.

[0102] In the embodiment, the spring seat 132 moves synchronously with the guide wheel seat 131, that is, the spring seat 132 is connected with the guide wheel seat 131. At this time, the elastic force of the first elastic member 150 acts on the spring seat 132, and then is transmitted to the guide wheel seat 131 by the spring seat 132. Since the spring seat 132 is in stable contact with the first elastic member 150, the elastic force generated by the first elastic member 150 can be efficiently transmitted to the guide wheel seat 131, which helps the guide wheel seat 131 to move smoothly, the chain shifting assembly 140 to shift smoothly, and gear shifting to be realized.

[0103] In a specific embodiment, referring to Figures 5 to 8 and Figure 16 and Figure 17 , the guide rod 120 includes a rod body 122 and a rotation stopping member 125, one end of the rod body 122 being fixedly connected to the fixed seat 110. The rod body 122 has a through slot 124 extending through the rod body 122 along a second axis, and a sliding slot 123 extending through the rod body 122 along a second direction perpendicular to the second axis, the sliding slot 123 being arranged along the second axis. The spring seat 132 is arranged in the through slot 124, and the rotation stopping member 125 is arranged in the sliding slot 123 and connects the spring seat 132 and the guide wheel seat 131. The rotation stopping member 125 serves as a rotation stopping part.

[0104] In the embodiment, the spring seat 132 is connected with the guide wheel seat 131 through the rotation stopping member 125 to move synchronously with the guide wheel seat 131. At this time, the spring seat 132 is arranged in the through slot 124, which can prevent dust and corrosion of the spring seat 132 and reduce jamming.

[0105] In a further embodiment, the sliding assembly 130 includes the rocker arm 136 in the above-mentioned embodiments, and the connecting part 1362 is a strip-shaped hole, the length direction of the strip-shaped hole being along the extension direction of the rocker arm 136. The rotation stopping member 125 further connects the guide wheel seat 131 and the strip-shaped hole. At this time, the connecting part 1362 of the rocker arm 136 is connected with the guide wheel seat 131 through the rotation stopping member 125. That is, the rotation stopping member 125 can simultaneously connect the guide wheel seat 131, the rocker arm 136, the spring seat 132 and the guide rod 120, further reducing the number of parts, the assembly difficulty and the cost of parts.

[0106] In a further embodiment, referring to Figure 16 and Figure 17The guide rod 120 further comprises a pulley seat 126, a first pulley 127 and a second pulley 128. The pulley seat 126 is fixed to the end of the rod body 122 away from the fixed seat 110. The first pulley 127 and the second pulley 128 are arranged on the pulley seat 126. The first elastic member 150 is limited between the spring seat 132 and the pulley seat 126. The cable 300 mounting seat is arranged on the spring seat 132. The cable guide hole 112, the first pulley 127, the second pulley 128 and the cable mounting portion 130a are sequentially arranged on the extension path of the cable 300. The cable 300 between the first pulley 127 and the cable mounting portion 130a and the cable 300 between the second pulley 128 and the cable guide hole 112 are parallel to the second axis.

[0107] In actual operation, the cable 300 passes through the cable guide hole 112, the first pulley 127 and the second pulley 128 in sequence and is then mounted on the cable mounting portion 130a. The first pulley 127 and the cable mounting portion 130a guide the cable 300 therebetween to be parallel to the second axis. The second pulley 128 and the cable guide hole 112 guide the cable 300 therebetween to also be parallel to the second axis. Thus, the tension of the cable 300 acting on the guide pulley seat 131 is parallel to the second axis, thereby avoiding jamming. At this time, the guide pulley seat 131 gradually moves away from the fixed seat 110 in the third direction. Therefore, the gear position is larger when the user tightens the cable 300 and is smaller when the user loosens the cable 300. The above

[0108] Of course, more pulleys can be arranged between the first pulley 127 and the second pulley 128 to guide the cable 300, but the economy is poorer than that of only arranging the first pulley 127 and the second pulley 128. Of course, one pulley can also be used to guide the cable 300. However, the pulley needs to have a large diameter to enable the cable 300 between the pulley and the cable guide hole 112 and the cable 300 between the pulley and the cable mounting portion 130a to be parallel to the second axis. At this time, the space occupied by the pulley is large, which is not conducive to the compactness of the entire structure.

[0109] Understandably, the first elastic member 150 generates an elastic force for promoting the guide pulley seat 131 to move in the fourth direction when the first elastic member 150 is compressed. The first elastic member 150 can be a compression spring. The cable mounting portion 130a can be a mounting hole on the spring seat 132.

[0110] In some embodiments, the derailleur 100 has an elastic portion which is drivingly connected to the derailleur assembly 140. The elastic portion provides an elastic torque for promoting the derailleur assembly 140 to tension the chain.

[0111] In actual operation, when the derailleur assembly 140 moves with the guide wheel seat 131, the chain will switch from one gear ring to another adjacent gear ring. In the process of switching, the chain will have a deflection problem due to the different diameters of the gear rings. In order to make the whole chain movement smooth, at this time, the elastic part is arranged to act on the derailleur assembly 140 so that the derailleur assembly 140 can re-tension the chain after the chain deflection changes. In addition, because different chains have different tension, when the chain is replaced, the derailleur assembly 140 can also be re-tensioned under the action of the elastic part.

[0112] Understandably, in other embodiments, the derailleur assembly 140 can also tension the chain under the action of other driving members such as a motor.

[0113] In some embodiments, please refer to Figures 9 to 13 The sliding assembly 130 further comprises a first spring seat 1321 sleeved with the guide rod 120, the first spring seat 1321 is rotatably mounted on the guide wheel seat 131 around a second axis, and is in driving connection with the derailleur assembly 140, the derailleur assembly 140 rotates synchronously with the first spring seat 1321. The first elastic member 150 serves as an elastic part. One end of the first elastic member 150 is fixedly connected with the fixed seat 110, and the other end is configured to rotate synchronously with the first spring seat 1321. The first elastic member 150 provides an elastic torsion to the first spring seat 1321, under the action of the elastic torsion, the first spring seat 1321 drives the derailleur assembly 140 to rotate and tension the chain.

[0114] In actual operation, the first elastic member 150 has a certain pre-tightening torsion. When the deflection of the chain changes, the force acting on the derailleur assembly 140 by the chain changes, at this time, the pre-tightening torsion drives the first spring seat 1321 to rotate slightly around the second axis, and the first spring seat 1321 in turn drives the derailleur assembly 140 to rotate slightly in the first direction, and re-tensions the chain.

[0115] In this embodiment, the first elastic member 150 serves as an elastic part. At this time, the first elastic member 150 can serve as an elastic member for urging the guide wheel seat 131 to move in the fourth direction, and also can serve as an elastic member for urging the derailleur assembly 140 to tension the chain, thereby reducing the number of parts and reducing the manufacturing cost.

[0116] In order to realize the synchronous non-parallel rotation of the derailleur assembly 140 and the first spring seat 1321, in some embodiments, the elastic part further comprises a bracket 133, a joint bearing 135 seat 134 and a joint bearing 135, one end of the bracket 133 is rotatably connected with the first spring seat 1321 around a sixth direction perpendicular to the second axis and the second direction, the other end of the bracket 133 is rotatably connected with the joint bearing 135 seat 134 around the sixth direction, the joint bearing 135 seat 134 is fixedly connected with the joint bearing 135, and the joint bearing 135 is rotatably connected with the derailleur assembly 140 around a direction parallel to the first direction. At this time, through the transmission connection of the bracket 133, the joint bearing 135 seat 134 and the joint bearing 135, the rotation of the derailleur assembly 140 around the first direction is converted into the rotation of the first spring seat 1321 around the second axis.

[0117] The above is not a limitation on the transmission connection mode of the derailleur assembly 140 and the first spring seat 1321, and other structural modes can also be adopted in other embodiments, which will not be described and limited in detail.

[0118] In an embodiment, please refer to Figure 13 , the first elastic member 150 comprises a spring body and a straight hook 152 and a flat hook 151 connected to both ends of the spring body, the straight hook 152 extends parallel to the axial direction of the spring body, and the flat hook 151 extends along the tangential direction of the spring body. The spring body is sleeved on the guide rod 120, and the straight hook 152 is fixedly connected with the fixed seat 110, and the flat hook 151 is clamped on the first spring seat 1321. At this time, the first elastic member 150 acts on the first spring seat 1321 through the flat hook 151 to generate an elastic torque, so that the first spring seat 1321 rotates.

[0119] In some embodiments, please refer to Figure 4 and Figure 8 , the derailleur mechanism 100 further comprises a second elastic member as an elastic part, the second elastic member 160 is arranged on the guide wheel seat 131, and the second elastic member 160 has a central axis coinciding with the first direction. One end of the second elastic member 160 is fixedly arranged on the guide wheel seat 131 along the central axis, and the other end is connected to the derailleur assembly 140 and provides an elastic torque to tension the chain.

[0120] In actual operation, the second elastic member 160 has a certain pre-tightening torque, when the deflection of the chain changes, the force acting on the derailleur assembly 140 changes, at this time the pre-tightening torque directly drives the derailleur assembly 140 to rotate slightly around the first direction, and the chain is tensioned again.

[0121] In the embodiment, the derailleur 100 is additionally provided with the second elastic member 160 to urge the chain to be tensioned by the chain derailleur 140, so that the first elastic member 150 can be variously configured and arranged, the overall structural arrangement can be optimized, the transmission structure between the first elastic member 150 and the chain derailleur 140 can be reduced, the overall structure can be simplified, and the operation reliability of the entire mechanism can be improved.

[0122] The second elastic member 160 can be a torsion spring.

[0123] In a specific embodiment, please refer to Figure 4 、 Figure 8 and Figure 13 , the chain derailleur 140 includes a guide wheel frame 141, a first guide wheel 142 and a second guide wheel 143, the first guide wheel 142 and the second guide wheel 143 are respectively arranged at opposite ends of the guide wheel frame 141 in the fifth direction perpendicular to the first axis, and the axis of the first guide wheel 142 and the axis of the second guide wheel 143 are arranged in parallel. The guide wheel frame 141 is rotatably connected to the guide wheel seat 131 in the third direction synchronously with the first guide wheel 142, the first guide wheel 142 and the second guide wheel 143 are used for engaging with the chain, and the elastic part is drivingly connected to the guide wheel frame 141.

[0124] In actual operation, the first guide wheel 142 is used for guiding the chain to be coplanar with the tooth disc surface. The second guide wheel 143 rotates with the guide wheel frame 141 during the rotation of the guide wheel frame 141 to tension the chain. The elastic part acts on the guide wheel frame 141 with an elastic torsion, and the second guide wheel 143 tensions the chain during the rotation of the guide wheel frame 141. At this time, the chain derailleur 140 has a simple and reliable structure and a low cost.

[0125] The second guide wheel 143 can rotate relative to the guide wheel frame 141 around a direction parallel to the first direction, or can be fixed relative to the guide wheel frame 141.

[0126] It should be noted that when the elastic part is the first elastic member 150, the first spring seat 1321 is drivingly connected to one end of the guide wheel frame 141 where the second guide wheel 143 is located. Specifically, the knuckle bearing 135 is coaxially connected with the second guide wheel 143. When the elastic part is the second elastic member 160, the second elastic member 160 is connected to one end of the guide wheel frame 141 where the first guide wheel 142 is located, and is eccentrically arranged relative to the first guide wheel 142.

[0127] Further, the guide wheel frame 141 comprises a first frame body 1411 and a second frame body 1412. The first guide wheel 142 and the second guide wheel 143 are located between the first frame body 1411 and the second frame body 1412, and the first frame body 1411 and the second frame body 1412 each have a first connecting portion 1362 at one end in the fifth direction and a second connecting portion 1362 at the other end. The two first connecting portions 1362 are configured to be coaxial with the first guide wheel 142 and rotatable about the first direction and connected to the guide wheel seat 131, and the two second connecting portions 1362 are configured to be coaxial with the second guide wheel 143. At this time, the first guide wheel 142 and the second guide wheel 143 are arranged between the two frame bodies, and the space formed by the two frame bodies can limit the chain on the first guide wheel 142 and the second guide wheel 143, avoiding the chain from disengaging the chain shifting assembly 140.

[0128] The first frame body 1411 and the second frame body 1412 are not limited in structure.

[0129] In an embodiment, the side of the guide wheel seat 131 away from the fixed seat 110 has a mounting shaft, the axis of the mounting shaft coincides with the first direction, the guide wheel frame 141 and the first guide wheel 142 are rotatably sleeved on the mounting shaft about the axis of the mounting shaft, and the second elastic member 160 is sleeved on the mounting shaft. Of course, in other embodiments, the guide wheel frame 141 and the first guide wheel 142 can also be mounted on the guide wheel seat 131 by other means such as connecting members.

[0130] In some embodiments, referring to Figure 14 and Figure 15 The chain shifting mechanism 100 further comprises a dust cover 170, which is sleeved on the outside of the guide rod 120 and is configured to be controlled to be telescopic along the second axis. One end of the dust cover 170 is fixedly arranged relative to the guide rod 120, and the other end is connected to the guide wheel seat 131. The dust cover 170 is telescopic when following the guide wheel seat 131 to move.

[0131] In this embodiment, the dust cover 170 can prevent dust from entering the inside of the guide rod 120 or falling on the sleeving surface 121 of the guide rod 120, further avoiding the problem of speed jamming caused by dust. At the same time, when the guide wheel seat 131 moves, the dust cover 170 is telescopic when following the guide wheel seat 131 to move, so that it can prevent dust while not interfering with the movement of the guide wheel seat 131.

[0132] In some embodiments, the dust cover 170 includes a first cover body 171 and a second cover body 172, the first cover body 171 is arranged between one end of the guide rod 120 and the guide wheel seat 131, and the second cover body 172 is arranged between the other end of the guide rod 120 and the guide wheel seat 131. In this way, when the guide wheel seat 131 moves, one of the first cover body 171 and the second cover body 172 shortens and the other elongates, and the total length of the first cover body 171 and the second cover body 172 can remain unchanged at any position of the guide wheel seat 131, so that the guide rod 120 can be dustproofed at any time.

[0133] The first cover body 171 and the second cover body 172 can be telescopic sleeve structures or bellows structures.

[0134] The chain shifting mechanism 100 described above is provided with only one guide rod 120 and combined with the rotation stopping part on the guide rod 120, the guide wheel seat 131 only moves along the guide rod 120 without rotating, and the guide wheel seat 131 can realize the switching of the chain between the gear rings in the moving process, the transmission structure is simple, and the transmission reliability is good, and the guide wheel seat 131 will not be stuck during gear shifting, thereby effectively avoiding the problem that the chain shifting mechanism 100 cannot smoothly shift the chain. At the same time, the second axis of the guide rod 120 is arranged at an acute angle with the first axis, so that the whole chain shifting mechanism has a small volume, which is helpful for miniaturization of the chain shifting assembly 140.

[0135] An embodiment of the present application also provides a bicycle including the chain shifting mechanism 100 in any of the above embodiments. It has the beneficial effects of any of the above embodiments, which will not be described here.

[0136] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0137] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A derailleur characterized by, The chain tensioner comprises: a fixed seat having a fixed part configured to be mounted on a rear wheel axle or a frame, the rear wheel axle or the frame also being used to mount a variable speed gear disc with a first axis as its own axis; a guide rod with a second axis as its own axis and being fixedly connected to the fixed seat, the second axis being configured to be arranged at an acute angle with the first axis, and the guide rod and the fixed part being located on the same side of the fixed seat in the direction of the first axis, the guide rod having a rotation stopping part thereon; a sliding assembly comprising a guide wheel seat movably sleeved on the guide rod along the second axis and being connected to the rotation stopping part, the rotation stopping part preventing the guide wheel seat from rotating around the second axis; and a chain shifting assembly configured to be rotatably mounted on the guide wheel seat in a first direction parallel to the first axis for tensioning a chain on the variable speed gear disc; a dust cover sleeved on the outside of the guide rod and being configured to be controlled to be telescopically movable along the second axis, one end of the dust cover being fixedly arranged relative to the guide rod and the other end being connected to the guide wheel seat, the dust cover being telescopically movable when following the guide wheel seat to move; wherein the guide wheel seat is configured to be moved in a third direction on the second axis under the action of a pulling cable, the chain shifting mechanism further comprises a first elastic member arranged on the guide rod and configured to provide an elastic force for urging the guide wheel seat to move in a fourth direction opposite to the third direction; the chain shifting mechanism has a pulling cable mounting part for mounting the pulling cable, the fixed seat is provided with a pulling cable guide hole for the pulling cable to pass through; the pulling cable guide hole is used to guide the pulling cable to exert a pulling force parallel to the second axis on the pulling cable mounting part; the pulling cable mounting part drives the guide wheel seat to move under the pulling of the pulling force; the sliding assembly further comprises a rocker arm, the rocker arm has a hinge part and a connecting part in the extending direction of the rocker arm, the hinge part is hinged to the fixed seat, and the hinge axis of the hinge part is perpendicular to the second axis, the connecting part is rotatably and movably connected to the guide wheel seat around the hinge axis in the extending direction of the rocker arm; the pulling cable mounting part is arranged on the rocker arm, and in the extending direction of the rocker arm, the hinge part is located between the pulling cable mounting part and the connecting part.

2. A derailleur as claimed in claim 1, characterised in that, The circumferential surface of the guide rod serves as the rotation stopping part, at least part of the circumferential surface is not parallel to the cylindrical surface with the second axis as the central axis, and the guide wheel seat has a matching surface fitted with the circumferential surface.

3. The derailleur according to claim 1, characterized in that, The guide rod comprises a rod body and a rotation stopping part, one end of the rod body is fixedly connected to the fixed seat, and the other end extends along the second axis; the rod body has a sliding groove therein, the sliding groove extends along the second axis and penetrates through the rod body along a second direction perpendicular to the second axis; the rotation stopping part penetrates through the sliding groove and is connected to the guide wheel seat.

4. The derailleur according to claim 1, characterized in that, The sliding assembly further comprises a spring seat movably sleeved on the guide rod along the second axis, and the first elastic member is limited between the spring seat and one end of the guide rod in the direction of the second axis. The spring seat is configured to move synchronously with the guide wheel seat, and the first elastic member generates the elastic force during the movement of the spring seat.

5. A derailleur as claimed in claim 4, characterised in that, The guide rod comprises a rod body and a rotation-stopping member as a rotation-stopping part, one end of the rod body is fixedly connected to the fixed seat; The rod body has a through slot along the second axis and a sliding slot along a second direction perpendicular to the second axis, the sliding slot is arranged along the second axis; the spring seat is arranged in the through slot, and the rotation-stopping member passes through the sliding slot and connects the spring seat and the guide wheel seat.

6. A derailleur as claimed in claim 5, characterised in that, The guide rod further comprises a pulley seat, a first pulley and a second pulley, the pulley seat is fixed to one end of the rod body away from the fixed seat, the first pulley and the second pulley are arranged in the pulley seat, and the first elastic member is limited between the spring seat and the pulley seat; The cable installation part is arranged on the spring seat, the cable guide hole, the first pulley, the second pulley and the cable installation part are sequentially arranged on the extension path of the cable; the cable between the first pulley and the cable installation part and the cable between the second pulley and the cable guide hole are parallel to the second axis.

7. The derailleur according to claim 1, characterized in that, The derailleur has an elastic part, the elastic part is drivingly connected to the derailleur assembly; the elastic part provides an elastic torque for tensioning the chain by the derailleur assembly.

8. A derailleur as claimed in claim 7, characterised in that, The sliding assembly further comprises a first spring seat sleeved with the guide rod, the first spring seat is rotatably arranged on the guide wheel seat about the second axis and drivingly connected to the derailleur assembly, and the derailleur assembly rotates synchronously with the first spring seat. The first elastic member is the elastic part, one end of the first elastic member is fixedly connected to the fixed seat, and the other end is configured to rotate synchronously with the first spring seat; the first elastic member provides the elastic torque for the first spring seat, and the first spring seat drives the derailleur assembly to rotate and tension the chain under the action of the elastic torque.

9. The derailleur according to claim 7, characterized in that, The derailleur further comprises a second elastic member as the elastic part, the second elastic member is arranged on the guide wheel seat, and the second elastic member has a central axis coinciding with the first direction. One end of the second elastic member on the central axis is fixedly arranged relative to the guide wheel seat, the other end is connected to the derailleur assembly, and the second elastic member provides an elastic torque for tensioning the chain by the derailleur assembly.

10. The derailleur according to claim 7, characterized in that, The derailleur assembly comprises a guide wheel frame, a first guide wheel and a second guide wheel, the first guide wheel and the second guide wheel are arranged at opposite ends of the guide wheel frame in a fifth direction perpendicular to the first axis, and the axis of the first guide wheel and the axis of the second guide wheel are arranged in parallel; the guide wheel frame is rotatably arranged on the guide wheel seat synchronously with the first guide wheel about the first direction. The first guide wheel and the second guide wheel are used for engaging with the chain, and the elastic part is drivingly connected to the guide wheel frame.

11. A bicycle characterized in that, The derailleur comprises the derailleur assembly according to any one of claims 1 to 10.

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