Derailleur for bicycle

Abstract

Provided in the present invention is a derailleur for a bicycle, the derailleur comprising a housing and a driving device mounted to the housing, wherein the driving device comprises an electric motor, a transmission assembly and a worm; the housing is integrally formed and comprises an annular vertical wall, a bottom wall, and at least one extension portion extending downwards from the bottom wall, the annular vertical wall and the bottom wall jointly defining a first chamber in the housing, the first chamber having an opening at the top that is adapted to be closed in a sealed manner to prevent liquid from entering the first chamber; positioning references of the electric motor, the transmission assembly and a pair of worm gear and worm are all configured on the housing, so that the whole driving device can be accurately positioned; and the transmission assembly is arranged inside the first chamber, and the electric motor, the worm and the worm gear are arranged outside the first chamber. The derailleur provided by the present invention is easy to assemble, and has high assembly precision and good waterproof performance.

Description

A bicycle derailleur Technical Field

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

[0002] The derailleur is a crucial component of a speed-shifting bicycle, used to shift the chain between wheels of different sizes to achieve speed changes. Existing derailleurs include manual derailleurs pulled by a steel cable and electric derailleurs driven by a motor. One existing electric derailleur's drive mechanism includes a motor, a gear assembly, and a worm gear mechanism. The motor drives the worm gear mechanism through the gear assembly, which in turn drives the connecting rod and chain guide to shift the chain. In electric derailleurs with this structure, the transmission direction of the worm gear mechanism intersects with the transmission direction of the gear assembly. The fixed base on which the drive mechanism is mounted is often configured as a cavity structure with open top and side portions. The gear assembly and worm gear mechanism are installed in the cavity structure. After the top and side portions of the fixed base are sealed, the top cover and side covers are assembled to complete the assembly. This solution forms a three-dimensional sealing surface, which complicates the assembly process, makes sealing difficult, and results in poor waterproof performance of the derailleur.

[0003] In view of this, it is necessary to propose a new technical solution to overcome the above-mentioned shortcomings.

[0004] Summary of the Invention

[0005] The present application provides a derailleur for a bicycle.

[0006] To achieve the above-mentioned object, the present application adopts the following technical solution: a bicycle derailleur, comprising a housing and a driving device mounted on the housing, the driving device comprising a motor, a transmission assembly, and a pair of worm gears, wherein:

[0007] The housing is integrally formed and includes an annular wall, a bottom wall, and at least one extension formed by extending downward from the bottom wall. The annular wall and the bottom wall together define a first chamber with an opening at the top within the housing. The opening is adapted to be sealed to prevent liquid from entering the first chamber.

[0008] The positioning references of the motor, transmission assembly and a pair of worm gears are all constructed on the housing so that the drive device can be accurately positioned as a whole;

[0009] The transmission assembly is arranged on the inner side of the first chamber, and the motor, worm and worm gear are arranged on the outer side of the first chamber.

[0010] Optionally, the motor is positioned on the bottom wall or the extension portion, the transmission assembly is positioned on the bottom wall, the worm wheel is positioned on the extension portion, and the worm is positioned between the bottom wall and the extension portion.

[0011] Optionally, the housing has a first worm positioning portion and a second worm positioning portion, the first worm positioning portion is constructed on the bottom wall, and the second worm positioning portion is constructed on the extension portion.

[0012] Optionally, the first positioning portion of the worm is a through hole formed on the bottom wall, and the second positioning portion of the worm is a positioning groove formed on the extended portion.

[0013] Optionally, the positioning axis of the motor and the positioning axis of the worm are parallel to each other, and the parallelism between the two is less than 0.1.

[0014] Optionally, the positioning axis of the motor and the positioning axis of the worm gear are perpendicular to each other, and the perpendicularity between the two is less than 0.1.

[0015] Optionally, an upper bearing sleeved on the upper end of the worm is installed in a limited position in the through hole, and a lower bearing sleeved on the lower end of the worm is installed in a limited position in the positioning groove.

[0016] Optionally, the bottom wall is integrally provided with a motor positioning seat extending downward, and the motor is installed on the motor positioning seat.

[0017] Optionally, the derailleur includes an inner cover disposed in the first cavity, a lower connecting portion is formed on the bottom wall, and the inner cover is provided with an upper connecting portion corresponding to the lower connecting portion;

[0018] The transmission assembly includes a plurality of gears, and the plurality of gears are correspondingly connected to the upper connecting portion and the lower connecting portion through the upper and lower ends of the gear shaft to be installed in the first chamber.

[0019] Optionally, the extended portion defines a second chamber with a side opening, the worm wheel is arranged in the second chamber, the worm is passed through the second chamber, and is transmission-connected between the transmission assembly and the worm wheel.

[0020] Optionally, the derailleur includes a side cover covering an opening of the second chamber.

[0021] Optionally, the derailleur further includes a power supply device, and the power supply device is installed at the opening of the first chamber of the housing.

[0022] Optionally, a sealing ring is provided between the power supply device and the opening of the first chamber, and the sealing ring is pressed against the opening by the power supply device to achieve sealing.

[0023] Optionally, the derailleur includes a chain guide and a connecting rod, the chain guide being configured to be movable relative to the housing, and the connecting rod being pivotally connected between the chain guide and the housing; and the driving device includes:

[0024] a toggle member configured to toggle the connecting rod to rotate relative to the housing around a set axis;

[0025] A biasing element is provided between the connecting rod and the toggle member, and the toggle member drives the connecting rod to rotate in at least one direction of movement through the biasing element;

[0026] In which, the biasing element has a main body, a first pin extending from the main body and abutting against the toggle member, and a second pin extending from the main body and abutting against the connecting rod; when viewed along the extension direction of the setting axis, the first pin extends from the main body toward the setting axis and extends beyond the setting axis.

[0027] Optionally, the toggle member drives the first pin to rotate about the set axis.

[0028] Optionally, the toggle member rotates around the setting axis, and the toggle member includes a tail end portion extending from the setting axis in a direction away from the main body, and the first pin is located on the side of the setting axis away from the main body and elastically abuts against the tail end portion of the toggle member.

[0029] Optionally, a support column is provided on the tail end portion, and the first pin is supported on a cylindrical surface of the support column.

[0030] Optionally, the tail end portion of the toggle member is provided with an adjustment device, and the adjustment device is configured to be able to adjust the height of the tail end portion.

[0031] Optionally, the adjustment device is an adjusting screw, which is threadedly connected to a screw hole on the tail end portion and passes through the screw hole to abut against the housing.

[0032] Optionally, the toggle member includes a front end portion extending from the setting axis toward the main body, and a portion of the first pin located between the setting axis and the main body elastically abuts against the front end portion of the toggle member.

[0033] Optionally, the orientation of the support surface of the front end portion for the first pin to abut is opposite to the orientation of the support surface of the rear end portion for the first pin to abut.

[0034] Optionally, the biasing element is a torsion spring, which is elastically compressed and arranged between the connecting rod and the toggle member, and the toggle member pushes the first pin in a direction in which the torsion spring is compressed.

[0035] The derailleur provided in the present application has a shell including a bottom wall and an annular vertical wall, which together define a first chamber with an opening at the top, the transmission assembly is arranged on the inner side of the first chamber, and the motor and the worm are arranged on the outer side of the first chamber, and the positioning references of the motor, the transmission assembly and a pair of worm gears are all constructed on the shell. Such an arrangement makes the derailleur easy to assemble, has high assembly accuracy, and the opening is easy to seal, thereby having good waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, and are not limitations to the present application.

[0037] FIG1 is a three-dimensional assembly diagram of the derailleur of the present application.

[0038] FIG2 is a perspective exploded view of the derailleur of the present application.

[0039] FIG3 is a perspective view of the derailleur display driving device of the present application.

[0040] FIG4 is a three-dimensional view of FIG3 from another perspective.

[0041] FIG5 is a three-dimensional view of FIG3 from another perspective.

[0042] FIG. 6 is a perspective exploded view of FIG. 3 .

[0043] FIG7 is a perspective view of the outer shell of the derailleur of the present application.

[0044] FIG8 is a perspective view of the outer shell of the derailleur of the present application from another perspective.

[0045] FIG. 9 is another exploded perspective view of the derailleur of the present application.

[0046] FIG10 is a three-dimensional assembly diagram of the derailleur of the present application after removing the fixed base.

[0047] FIG11 is a three-dimensional composite diagram of the derailleur of the present application after removing the fixed base from another perspective.

[0048] FIG. 12 is a perspective view of the combination of the shifting member and the biasing element in the derailleur of the present application.

[0049] FIG13 is a perspective exploded view of the shifting member and the biasing element in the derailleur of the present application.

[0050] FIG. 14 is a perspective exploded view of the derailleur and biasing element of the present application from another perspective.

[0051] Explanation of reference numerals: 100 - derailleur; 1 - fixed base; 11 - housing; 101 - first chamber; 102 - second chamber; 111 - bottom wall; 1111 - lower connecting portion; 112 - annular vertical wall; 113 - motor positioning seat; 114 - extension portion; 115 - through hole; 116 - lower positioning portion; 12 - inner cover; 121 - upper connecting portion; 13 - side cover; 14 - side bracket; 2 - chain guide; 3 - connecting rod; 31 - first connecting rod; 311 - first connecting ear; 312 - second connecting ear; 315 - adjusting member; 32 - second connecting rod; 321 - third connecting ear; 322 - fourth connecting ear; 4 - driving device; 40 - motor; 41 - transmission assembly; 411 - gear shaft; 42 - worm; 422 - lower bearing; 43 - worm wheel; 44 - Toggle member; 441-pivot portion; 442-tail portion; 4421-support column; 443-front portion; 445-adjustment device; 45-output shaft; 48-electrical connector; 481-plug connector; 5-power supply device; 51-battery; 52-battery bottom cover; 53-sealing ring; 6-biasing element; 61-main body; 62-first pin; 63-second pin; 7-biasing member; 81-first rotating shaft; 82-second rotating shaft; 83-third rotating shaft; 84-fourth rotating shaft. DETAILED DESCRIPTION

[0052] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0054] Unless otherwise defined, technical or scientific terms used in this patent document shall have the ordinary meaning as understood by persons of ordinary skill in the art to which this application belongs. The terms "first," "second," and similar terms used in this patent specification and claims do not denote any order, quantity, or importance, but are merely used to distinguish one component from another. Similarly, terms such as "a," "an," or "the" do not denote a limitation of quantity, but rather denote the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects preceding the term "include" or "comprising" include the elements or objects listed after the term and their equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used solely to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. These terms are used solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0056] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0057] Referring to Figures 1 and 2 , an embodiment of a bicycle derailleur 100 provided herein includes a fixed base 1, a chain guide 2, a connecting rod 3, a drive device 4, and a power supply 5. The fixed base 1 is adapted to be fixed to a bicycle frame. The connecting rod 3 includes a first connecting rod 31 and a second connecting rod 32, each pivotally connected between the fixed base 1 and the chain guide 2. The drive device 4 is disposed within the fixed base 1 and is configured to drive the connecting rod 3 and the chain guide 2. The power supply 5 is attached to the fixed base 1 and is configured to provide electrical energy to the drive device 4. In one embodiment, the derailleur 100 is a front derailleur for a bicycle.

[0058] Referring to Figures 7 and 8 , the derailleur 100 includes a housing 11. In this embodiment, the housing 11 constitutes a portion of the fixed base 1. In this embodiment, the housing 11 is a plastic component, integrally injection-molded. In other embodiments, the housing 11 may also be a metal component, such as a die-cast aluminum alloy, a machined part, or the like. The housing 11 includes a bottom wall 111 and an annular wall 112. The annular wall 112 and the bottom wall 111 collectively define a first chamber 101 within the housing 11 with an opening at the top. The opening is adapted to be hermetically closed to prevent liquid from entering the first chamber 101. In this embodiment, the first chamber 101 is a generally rectangular parallelepiped space, and the annular wall 112 is a closed sidewall circumferentially surrounding the first chamber 101.

[0059] The housing 11 also includes a motor locating seat 113 integrally extending downward from the bottom wall 111 for mounting the motor 40 (shown in FIG6 ) included in the drive device 4. The motor locating seat 113 is cylindrical, and the bottom wall 111 defines an axial hole communicating with the interior of the cylindrical shape. The motor 40 is mounted within the motor locating seat 113, and the motor shaft of the motor 40 passes through the axial hole and connects to the transmission assembly 41 of the drive device 4.

[0060] Referring to Figures 3 to 6 , the drive device 4 includes a motor 40, a transmission assembly 41, a worm 42, and a worm wheel 43. The positioning references for the motor 40, transmission assembly 41, and the pair of worm wheels 43 and 42 are all constructed on the housing 11, allowing the drive device 4 to be precisely positioned as a whole. Specifically, the motor 40, transmission assembly 41, and worm 42 are positioned on the bottom wall 111. The transmission assembly 41 is positioned inside the first chamber 101, while the motor 40 and worm 42 are positioned outside the first chamber 101. In this embodiment, the motor 40 is mounted within a motor mounting base 113 below the bottom wall 111, and the output shaft of the motor 40 is connected to the transmission assembly 41 through an axial hole in the bottom wall 111. The transmission assembly 41 is a gear set comprising a plurality of gears, each having a gear shaft 411 in the middle. The gears are directly mounted to the bottom wall 111 via the gear shaft 411. Referring also to FIG8 , in this embodiment, the bottom wall 111 is formed with a plurality of lower connecting portions 1111. These lower connecting portions 1111 are protruding columns with a circular hole in the middle. The lower end of the gear shaft 411 is correspondingly connected to these lower connecting portions 1111. These lower connecting portions 1111 restrict radial movement of the gear but do not restrict rotation. Corresponding to these lower connecting portions 1111, the derailleur 100 also has an upper connecting portion. Referring also to FIG2 , in this embodiment, the derailleur 100 includes an inner cover 12 disposed within the first chamber 101. The inner cover 12 is provided with an upper connecting portion 121 corresponding to the lower connecting portions 1111. The upper end of the gear shaft 411 is correspondingly connected to these upper connecting portions 121, thereby securing the gear within the first chamber 101.

[0061] Referring to Figures 3, 5, 6, and 8, the housing 11 includes an extension 114 extending downward from the bottom wall 111. The motor 40 is positioned on the bottom wall 111 or the extension 114. The transmission assembly 41 is positioned on the bottom wall 111. The worm gear 43 is positioned on the extension 114. The worm 42 is positioned between the bottom wall 111 and the extension 114. In this embodiment, the extension 114 encloses a second chamber 102 having a lateral opening. As shown by arrows D1 and D2 in Figures 3 and 8, the opening of the first chamber 101 is oriented as shown by arrow D1, and the opening of the second chamber 102 is oriented as shown by arrow D2. The two orientations are substantially perpendicular, and the term "substantially perpendicular" includes both perpendicular and slightly deviating from the absolute perpendicular.

[0062] The worm wheel 43 included in the drive device 4 is accommodated in the second chamber 102. The worm 42 is inserted into the second chamber 102 and is transmission-connected between the transmission assembly 41 and the worm wheel 43. The housing 11 has a first worm positioning portion and a second worm positioning portion. The first worm positioning portion is constructed on the bottom wall 111, and the second worm positioning portion is constructed on the extension portion 114. In this embodiment, the bottom wall 111 has a through hole 115 for mounting the worm 42. The first chamber 101 and the second chamber 102 are separated by the bottom wall 111 and connected by the through hole 115. The through hole 115 constitutes the first worm positioning portion. The second chamber 102 is provided with a lower positioning portion 116 for positioning the lower end of the worm 42. The lower positioning portion 116 and the bottom wall 111 are integrally formed and are a positioning groove. The positioning groove constitutes the second worm positioning portion. An upper bearing sleeved around the upper end of the worm 42 is positioned within the through hole 115, and a lower bearing 422 sleeved around the lower end of the worm 42 is positioned within the lower positioning portion 116. In this embodiment, since the first chamber 101, the second chamber 102, the through holes 115 for positioning the upper and lower ends of the worm 42, and the lower positioning portion 116 are all integrally formed from the housing 11, the transmission assembly 41, the worm 42, and the worm wheel 43 included in the drive device 4 are all mounted on the same component, which helps reduce assembly errors and improves the transmission accuracy of the drive device 4. After the drive device 4 is assembled on the housing 11, the axial direction of the worm 42 is approximately parallel to the direction of the opening of the first chamber 101. The term "approximately parallel" includes parallelism and slight deviation from absolute parallelism. The positioning axis of the motor 40 and the positioning axis of the worm 42 are parallel to each other, and the degree of parallelism between the two is less than 0.1. The positioning axis of the motor 40 and the positioning axis of the worm gear 43 are perpendicular to each other, and the perpendicularity between the two is less than 0.1. This configuration of parallelism and perpendicularity ensures transmission accuracy and prevents tooth play. The worm gear 43 is connected to an output shaft 45, which is provided with a toggle member 44. The rotation of the worm 42 drives the worm gear 43 to swing upward or downward. The worm gear 43 drives the output shaft 45 to rotate, thereby driving the toggle member 44 to move. The toggle member 44 drives the connecting rod 3 and the chain guide 2 to move, achieving chain shifting.

[0063] As shown in FIG6 , the derailleur 100 includes a side cover 13 covering the opening of the second chamber 102 and a side bracket 14 disposed on a side of the housing 11 facing away from the side cover 13 . The side cover 13 and the side bracket 14 are fixedly connected to the housing 11 .

[0064] Referring again to Figures 1 and 2 , the derailleur 100 includes a power supply device 5 mounted at the opening of the first chamber 101 of the housing 11. A sealing ring 53 is disposed between the power supply device 5 and the opening of the first chamber 101. The sealing ring 53 is pressed against the opening by the power supply device 5 to seal the opening. In one embodiment, the sealing ring 53 is a rubber ring. In this embodiment, the sidewall of the first chamber 101 is a closed annular wall 112, and the opening is formed in a single plane. This facilitates the placement of the sealing ring 53 and provides a good sealing effect. In this embodiment, the power supply device 5 includes a battery 51 and a battery bottom cover 52. An electrical connector 48 is secured to the opening of the first chamber 101 of the housing 11. The electrical connector 48 is plate-shaped and covers the opening of the first chamber 101. The electrical connector 48 is also provided with a plug connector 481 that plugs into the power supply device 5 to establish an electrical connection between the power supply device 5 and the drive device 4.

[0065] From the above description of the specific embodiments, it can be seen that the chain derailleur 100 provided in the present application has a housing 11 including a bottom wall 111 and an annular vertical wall 112. The bottom wall 111 and the annular vertical wall 112 jointly define a first chamber 101 with an opening at the top. The transmission assembly 41 is arranged on the inner side of the first chamber 101, and the motor 40 and the worm 42 are arranged on the outer side of the first chamber 101. The positioning references of the motor 40, the transmission assembly 41 and a pair of worm gears are all constructed on the housing 11. Such an arrangement makes the chain derailleur 100 easy to assemble, with high assembly precision, and the opening is easy to be sealed, thereby having good waterproof performance.

[0066] 9 to 14 , in an embodiment of a bicycle derailleur 100 provided in the present application, the derailleur 100 further includes a biasing element 6 and a biasing member 7 , and the driving device 4 includes a shifting member 44 that cooperates with the biasing element 6 to shift the connecting rod 3 for movement.

[0067] As shown in Figure 9 , the chain guide 2 is configured to be movable relative to the fixed base 1. The chain guide 2 includes two substantially parallel side panels and two connecting edges connected at both ends of the side panels. The two side panels and the two connecting edges enclose a substantially rectangular space. One of the two connecting edges is connected to the fixed base 1 via a connecting rod 3. Specifically, the chain guide 2 is provided with a first pivot portion 21 and a second pivot portion 22 near one of the two connecting edges. The first pivot portion 21 and the second pivot portion 22 are spaced apart. Each of the first pivot portion 21 and the second pivot portion 22 is a pair of lugs for receiving a rotating shaft, thereby pivotally connecting the chain guide 2 to the connecting rod 3. The bicycle chain passes through the rectangular space of the chain guide 2. During travel, the chain remains in a position that does not contact the two side plates and two connecting edges of the chain guide 2, thereby preventing friction between the chain and the chain guide 2. When shifting gears, the chain guide 2 can be driven to move, so that the side plates of the chain guide 2 contact the sides of the chain and push the chain to move, thereby enabling the chain to switch between pulleys of different sizes and achieve speed change.

[0068] The ends of the connecting rod 3 are pivotally connected to the chain guide 2 and the fixed base 1, respectively. Specifically, in this embodiment, the connecting rod 3 includes a first connecting rod 31 and a second connecting rod 32. The first connecting rod 31 includes a first connecting lug 311 and a second connecting lug 312. The first connecting lug 311 is pivotally connected to the fixed base 1 via a first rotating shaft 81, and the second connecting lug 312 is pivotally connected to the chain guide 2 via a second rotating shaft 82. The first connecting lug 311 and the second connecting lug 312 are a pair of opposing lugs. The second connecting lug 312 corresponds to the first pivot portion 21 on the chain guide 2, so that the second rotating shaft 82 passes through the through-holes of the first pivot portion 21 and the second connecting lug 312 to pivotally connect the two. The second connecting rod 32 is constructed in a manner substantially similar to the first connecting rod 31. Specifically, the second connecting rod 32 includes a third connecting lug 321 and a fourth connecting lug 322. The third connecting lug 321 is pivotally connected to the fixed base 1 via a third rotating shaft 83, and the fourth connecting lug 322 is pivotally connected to the chain guide 2 via a fourth rotating shaft 84. The third connecting lug 321 and the fourth connecting lug 322 are a pair of opposing lugs. The fourth connecting lug 322 corresponds to the second pivot portion 22 on the chain guide 2, so that the fourth rotating shaft 84 passes through the through-holes in the second pivot portion 22 and the fourth connecting lug 322 to pivotally connect the two. In this embodiment, the fixed base 1 includes a removable side bracket 14, and the third rotating shaft 83 is connected to the side bracket 14. The first connecting lug 311 and the second connecting lug 312 of the first connecting rod 31 are spaced apart, the third connecting lug 321 and the fourth connecting lug 322 of the second connecting rod 32 are spaced apart, and the first rotating shaft 81 and the third rotating shaft 83 are also spaced apart on the fixed base 1. After the chain guide 2, the first connecting rod 31, and the second connecting rod 32 are pivotally connected via the first rotating shaft 81, the second rotating shaft 82, the third rotating shaft 83, and the fourth rotating shaft 84, the fixed base 1, the first connecting rod 31, the chain guide 2, and the second connecting rod 32 form a four-bar linkage. The chain guide 2 moves in response to movement of the first connecting rod 31 relative to the fixed base 1, and the second connecting rod 32 moves in response to movement of the chain guide 2 relative to the fixed base 1.

[0069] The drive device 4 includes a motor 40, a transmission assembly 41, a worm 42, a worm wheel 43, and a toggle 44, as described above. Further, as shown in Figures 9 to 11, the toggle 44 is fixedly disposed relative to the first rotating shaft 81 in the circumferential direction of the first rotating shaft 81. That is, the first rotating shaft 81 drives the toggle 44 to rotate synchronously. The toggle 44 is configured to toggle the connecting rod 3 to rotate about a set axis relative to the fixed base 1. Specifically, the toggle 44 can toggle the first connecting rod 31 to rotate about the first rotating shaft 81 relative to the fixed base 1. The rotation of the first connecting rod 31 about the first rotating shaft 81 drives the chain guide 2 to move, thereby driving the second connecting rod 32 to rotate about the third rotating shaft 83. The set axis is the axis of the first rotating shaft 81 and the axis of the third rotating shaft 83. The rotation of the output end of the motor 40 is transmitted to the connecting rod 3 and the chain guide 2 through the transmission assembly 41, the worm 42, the worm wheel 43, the first rotating shaft 81 and the toggle member 44 in sequence, thereby realizing the movement of the connecting rod 3 and the chain guide 2.

[0070] Continuing with Figures 9 to 11 , a biasing element 6 is disposed between the connecting rod 3 and the toggle member 44. The toggle member 44 rotates the connecting rod 3 in at least one direction of motion via the biasing element 6. Referring to Figures 12 to 14 , the biasing element 6 comprises a main body 61, a first pin 62 extending from the main body 61 and abutting the toggle member 44, and a second pin 63 extending from the main body 61 and abutting the connecting rod 3. In this embodiment, the biasing element 6 is a torsion spring, with the main body 61 being a spiral portion that is sleeved on the second rotating shaft 82. The biasing element 6 is positioned in a torsionally compressed state between the toggle member 44 and the first connecting rod 31. Because the biasing element 6 is in a torsionally compressed state, it exerts an elastic restoring force, which acts to urge the toggle member 44 and the first connecting rod 31 toward each other.

[0071] The toggle member 44 includes a pivot portion 441 and a front end portion 443 and a tail end portion 442 located on both sides of the pivot portion 441. The pivot portion 441 is sleeved on the first rotating shaft 81, and the front end portion 443 and the tail end portion 442 are located on opposite sides of the first rotating shaft 81. The dotted line P1 shows the central axis of the first rotating shaft 81 of the toggle member 44 in the assembled state, which is also the set axis for the rotation of the toggle member 44 and the first connecting rod 31 relative to the fixed base 1.

[0072] The biasing element 6 includes a main body 61 and a first pin 62 and a second pin 63 extending from both ends of the main body 61. When viewed along the extension direction of the setting axis P1, the first pin extends from the main body 61 toward the setting axis P1 and extends beyond the setting axis P1. When the biasing element 6 is assembled with the toggle member 44, the tail end 442 of the toggle member 44 is located on the side of the setting axis P1 away from the main body 61. The portion of the first pin 62 near its free end, that is, the portion located on the side of the setting axis P1 away from the main body 61, elastically abuts against the tail end 442 of the toggle member 44, and the toggle member 44 drives the first pin 62 to rotate about the setting axis P1. Furthermore, a support column 4421 is provided on the tail end 442, and the first pin 62 is supported on the cylindrical surface of the support column 4421 to reduce friction between the first pin 62 and the tail end 442.

[0073] The rear end 442 of the toggle member 44 is provided with an adjustment device 445 configured to adjust the height of the rear end 442. In this embodiment, the adjustment device 445 is an adjustment screw that is threaded into a threaded hole in the rear end 442 and passes through the threaded hole to abut against the housing 11 of the fixed base 1. An adjustment member 315 is also provided between the first connecting rod 31 and the toggle member 44 for adjusting the distance therebetween. The adjustment member 315, in conjunction with the adjustment device 445, adjusts the position of the chain guide 2 relative to the chain by adjusting the position of the connecting rod 3. During long-term use of a bicycle, the mechanism formed by the connecting rod 3 and the chain guide 2 may shift when subjected to external forces. This can cause the chain passing through the chain guide 2 to shift from being centered left or right within the rectangular space formed by the chain guide 2. This can cause the chain to rub against one of the side panels of the chain guide 2, resulting in noise and chain wear. By adjusting the position of the connecting rod 3, the position of the chain guide 2 relative to the chain can be adjusted to prevent contact and friction between the chain and the chain guide 2. In the embodiment of the present application, the adjusting member 315 is provided on the first connecting rod 31 and moves synchronously with the first connecting rod 31 and the toggle member 44. The adjusting member 315 is also an adjusting screw. The adjusting screw is connected to a threaded hole on the first connecting rod 31 and passes through the threaded hole to abut against the toggle member 44.

[0074] In this embodiment, the portion of the first pin 62 extending beyond the setting axis P1 abuts against the tail portion 442 of the toggle member 44, while the portion of the first pin 62 located between the setting axis P1 and the main body 61 is suspended between the front portion 443 of the toggle member 44. In another embodiment, the front portion 443 of the toggle member 44 extends from the setting axis P1 toward the main body 61, and the portion of the first pin 62 located between the setting axis P1 and the main body 61 can also elastically abut against the front portion 443 of the toggle member 44. The support surface of the front portion 443 for abutment by the first pin 62 is oriented in an opposite direction to the support surface of the tail portion 442 for abutment by the first pin 62.

[0075] The biasing element 6 is a torsion spring, elastically compressed and disposed between the first connecting rod 31 and the toggle member 44. The toggle member 44 pushes the first pin 62 in the direction that compresses the torsion spring. Specifically, the toggle member 44 pushes the first pin 62 toward the first connecting rod 31. When the toggle member 44, driven by the motor 40 or the like, drives the first pin 62 in the direction that compresses the torsion spring, i.e., when the toggle member 44 rotates in the direction indicated by the arrow in FIG10 , the toggle member 44, through the biasing element 6, drives the first connecting rod 31, and thereby the chain guide 2 and the second connecting rod 32. During this movement, the tail end 442 of the toggle member 44 maintains contact with the first pin 62, ensuring a stable force transmitted to the biasing element 6. This prevents a reduction in the derailleur force due to a relative change in the position of the toggle member 44, which could lead to derailleur failure. When the toggle member 44 is driven by the motor 40 or the like in a direction opposite to the rotational direction indicated by the arrow in FIG. 10 , the toggle member 44 no longer toggle the first connecting rod 31 via the biasing element 6, but rather achieves this through direct hard contact between the front end portion 443 of the toggle member 44 and the first connecting rod 31. In this embodiment, the direction in which the toggle member 44 drives the connecting rod 3 to rotate via the biasing element 6 is the direction in which the drive chain moves from the small pulley to the large pulley; and the direction in which the toggle member 44 drives the connecting rod 3 to rotate via hard contact is the direction in which the drive chain moves from the large pulley to the small pulley.

[0076] Referring again to Figures 9 to 11 , a biasing member 7 is disposed between the second link 32 and the chain guide 2. The biasing member 7 is configured to provide a biasing force to the chain guide 2, facilitating movement of the chain guide 2 in at least one direction of movement of the chain guide 2 relative to the fixed base 1. In this embodiment, the biasing member 7 is a torsion spring, one end of which abuts the second link 32 and the other end of which abuts the chain guide 2. When the link 3 and chain guide 2 move in one direction, for example, when the chain moves from the small pulley to the large pulley or vice versa, the biasing member 7 is compressed, storing force. When the link 3 and chain guide 2 move in the opposite direction, the compressed biasing member 7 releases its elastic force, thereby facilitating chain shifting.

[0077] From the above description of the specific embodiment, it can be known that the bicycle derailleur 100 provided in the present application includes a toggle member 44, which toggle the connecting rod 3 to rotate through a biasing element 6 in at least one movement direction, and the biasing element 6 has a main body 61, a first pin 62 extending from the main body 61 and abutting against the toggle member 44, and a second pin 63 extending from the main body 61 and abutting against the connecting rod 3. When observed along the extension direction of the set axis, the first pin 62 extends from the main body 61 toward the set axis and extends beyond the set axis; such an arrangement allows the toggle member 44 to always maintain a position with the first pin 62 in which a stable toggle force can be applied when the biasing element 6 is toggled, thereby avoiding the problem of toggle failure caused by a relative change in the position of the first pin 62 and the toggle member 44 during the toggle process, which reduces the toggle force.

[0078] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A bicycle derailleur, comprising a housing and a driving device mounted on the housing, wherein the driving device comprises a motor, a transmission assembly and a pair of worm gears, characterized in that: The housing is integrally formed and comprises an annular vertical wall, a bottom wall and at least one extended portion formed by the bottom wall extending downward, the annular vertical wall and the bottom wall jointly define a first chamber with an opening at the top in the housing, the opening being adapted to be sealed and closed to prevent liquid from entering the first chamber; The positioning references of the motor, the transmission assembly and the pair of worm gears are all constructed on the housing so that the drive device can be accurately positioned as a whole; Wherein, the transmission assembly is arranged on the inner side of the first chamber, and the motor, the worm and the worm wheel are arranged on the outer side of the first chamber.

2. The derailleur according to claim 1, wherein: The motor is positioned on the bottom wall or the extended portion, the transmission assembly is positioned on the bottom wall, the worm wheel is positioned on the extended portion, and the worm is positioned between the bottom wall and the extended portion.

3. The derailleur according to claim 1 or 2, characterized in that: The housing is provided with a first worm positioning portion and a second worm positioning portion. The first worm positioning portion is configured on the bottom wall, and the second worm positioning portion is configured on the extended portion.

4. The derailleur according to claim 3, characterized in that: The first positioning portion of the worm is a through hole formed on the bottom wall, and the second positioning portion of the worm is a positioning groove formed on the extended portion.

5. The derailleur according to claim 1 or 2, characterized in that: The positioning axis of the motor and the positioning axis of the worm are parallel to each other, and the parallelism between the two is less than 0.

1.

6. The derailleur according to claim 5, characterized in that: The positioning axis of the motor and the positioning axis of the worm wheel are perpendicular to each other, and the perpendicularity between the two is less than 0.

1.

7. The derailleur according to claim 4, wherein: An upper bearing sleeved on the upper end of the worm is installed in a limited position in the through hole, and a lower bearing sleeved on the lower end of the worm is installed in a limited position in the positioning groove.

8. The derailleur according to claim 2, wherein: The bottom wall is integrally provided with a motor positioning seat extending downward, and the motor is installed on the motor positioning seat.

9. The derailleur according to claim 1, wherein: The derailleur comprises an inner cover disposed in the first chamber, a lower connecting portion is formed on the bottom wall, and the inner cover is provided with an upper connecting portion corresponding to the lower connecting portion; The transmission assembly includes a plurality of gears, and the plurality of gears are connected to the upper connecting portion and the lower connecting portion through the upper and lower ends of the gear shaft respectively, so as to be installed in the first chamber.

10. The derailleur according to claim 1, wherein: The extended portion defines a second chamber with a side opening, the worm wheel is arranged in the second chamber, the worm screw passes through the second chamber, and is transmission-connected between the transmission assembly and the worm wheel.

11. The derailleur according to claim 10, wherein: The derailleur includes a side cover covering an opening of the second chamber.

12. The derailleur according to claim 1, wherein: The derailleur further comprises a power supply device, which is installed at the opening of the first chamber of the housing.

13. The derailleur according to claim 12, wherein: A sealing ring is provided between the power supply device and the opening of the first chamber, and the sealing ring is pressed against the opening by the power supply device to achieve sealing.

14. The derailleur according to claim 1, wherein: The derailleur comprises a chain guide and a connecting rod, wherein the chain guide is configured to be movable relative to the housing, and the connecting rod is pivotally connected between the chain guide and the housing; the driving device comprises: A toggle member configured to toggle the connecting rod to rotate relative to the housing around a set axis; A biasing element is provided between the connecting rod and the toggle member, and the toggle member drives the connecting rod to rotate in at least one direction of movement through the biasing element; The biasing element comprises a main body, a first pin extending from the main body and abutting against the toggle member, and a second pin extending from the main body and abutting against the connecting rod; when viewed along the extension direction of the setting axis, When observed, the first pin extends from the main body toward the set axis and extends beyond the set axis.

15. The bicycle derailleur according to claim 14, wherein: The toggle member drives the first pin to rotate about the set axis.

16. The bicycle derailleur according to claim 15, wherein: The toggle member rotates around the setting axis, and includes a tail portion extending from the setting axis in a direction away from the main body, and the first pin is located on a side of the setting axis away from the main body and elastically abuts against the tail portion of the toggle member.

17. The bicycle derailleur according to claim 16, wherein: A support column is provided on the tail end portion, and the first pin is supported on the cylindrical surface of the support column.

18. The bicycle derailleur according to claim 16, wherein: The tail end portion of the toggle member is provided with an adjustment device, and the adjustment device is configured to be able to adjust the height of the tail end portion.

19. The bicycle derailleur according to claim 18, wherein: The adjusting device is an adjusting screw, which is threadedly connected to a screw hole on the tail end portion and passes through the screw hole to abut against the housing.

20. The bicycle derailleur according to claim 16, wherein: The toggle member includes a front end portion extending from the setting axis toward the main body portion, and a portion of the first pin located between the setting axis and the main body portion elastically abuts against the front end portion of the toggle member.

21. The bicycle derailleur according to claim 20, wherein: The direction of the support surface of the front end portion for the first pin to abut is opposite to the direction of the support surface of the rear end portion for the first pin to abut.

22. The bicycle derailleur according to any one of claims 14 to 21, wherein: The biasing element is a torsion spring, which is elastically compressed and disposed between the connecting rod and the toggle member. The toggle member pushes the first pin in a direction in which the torsion spring is compressed.

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