Electronic gear shifting multi-gear transmission assembly for tricycle

Abstract

An electronic gear shifting multi-gear transmission assembly for a tricycle comprises a shell and a transmission device. The transmission device comprises an input gear shaft, a first transmission shaft and a second transmission shaft; a second-gear and third-gear shifting mechanism is arranged between the second-gear driving tooth and the third-gear driving tooth on the first transmission shaft and used for being connected with the second-gear driving tooth or the third-gear driving tooth, and a first-gear shifting mechanism is arranged on the second transmission shaft and used for being connected with the first-gear driven tooth; the first-gear shifting mechanism and the second-third-gear shifting mechanism are connected with the shifting fork driving mechanism through shifting forks respectively, the shifting fork driving mechanism comprises a shifting fork supporting shaft, at least two U-shaped supports and a shifting hub, the shifting fork supporting shaft is a fixed shaft, the U-shaped supports and the shifting forks are both arranged on the shifting fork supporting shaft in a sliding fit mode, the shifting forks and the U-shaped supports are axially positioned through positioning pins, and the shifting forks are arranged on the shifting fork supporting shaft. The gear shifting hub is provided with a guide cam groove extending in the circumferential direction, guide pins arranged at the top ends of the U-shaped supports are in sliding fit with the guide cam groove, the gear shifting hub is fixed to a rotating shaft, and the rotating shaft is driven by a gear shifting motor.

Description

Technical Field

[0001] The utility model relates to a transmission for a tricycle, in particular to a multi-speed transmission assembly with electronic gear shifting for a tricycle. Background Art

[0002] The existing transmissions of three-wheeled motorcycles or three-wheeled electric vehicles usually adopt manual gear shifting. For example, the transmission of the rear axle of a tricycle disclosed in CN201003573Y, the shift fork shaft of the transmission extends out of the box body and is connected to a control cable. By pulling the shift fork shaft through the control cable, the shift fork provided on the shift fork shaft can drive the gear for clutch to separate from the constantly meshing driven gear and engage with the reduction gear, realizing two-speed shifting. The shift fork shaft of this kind of manually controlled rear axle transmission of a tricycle needs to be controlled by a manually operated control cable, so that the shift fork can move the clutch gear to shift between the high-speed and low-speed gears, realizing two-speed drive;

[0003] Another example is the transmission of a tricycle disclosed in CN201587513U, which can realize multi-speed shifting, such as Figure 12As shown in the figure, the transmission is provided with an input shaft, an intermediate shaft, and an output shaft. An input gear is arranged on the input shaft, an intermediate gear is arranged on the intermediate shaft, and an output gear is arranged on the output shaft. "The output shaft 3 is a hollow shaft, and a first shifting shaft 4 and a first clutch slider 5 are arranged therein. The intermediate shaft 2 is provided with an axial hole 6, and a second shifting shaft 7 is arranged in the axial hole 6. A radial through hole 10 is arranged at the input intermediate gear 91, and a second clutch slider 11 is arranged in the radial through hole 10. The first shifting shaft 4 and the second shifting shaft 7 are stepped shafts, so these two shafts can make the first clutch slider 5 and the second clutch slider 11 move radially in the radial through hole through axial movement. One end of the first shifting shaft 4 is provided with a first cable drum 13 fixedly connected to the box body 31; a first shifting groove 131 is arranged on the first cable drum 13; a first coupling sleeve 14 with a first coupling hole 141 is arranged in the first cable drum 13; the aperture of the first coupling hole 141 is smaller than the width of the first shifting groove 131; a first pin 15 fixedly connected to the first cable 29 is arranged in the first coupling hole 141 and the first shifting groove 131; one end of the second shifting shaft 7 is provided with a second cable drum 18 fixedly connected to the box body 31; a second shifting groove 181 is arranged in the second cable drum 18; a second coupling sleeve 19 with a second coupling hole 191 is arranged in the second cable drum 18; the aperture of the second coupling hole 191 is smaller than the width of the second shifting groove 181; a second pin 20 fixedly connected to the second cable 30 is arranged in the second coupling hole 191 and the second shifting groove 181." (See paragraphs 0031 to 0033 of CN201587513U) to achieve multi-gear shifting of a tricycle. However, this transmission has the following disadvantages: This kind of tricycle rear axle transmission needs to manually pull the cable for shifting, and cannot achieve automatic shifting; different cables need to be pulled during shifting, which is not conducive to safe driving; the space of the tricycle is limited, and it is impossible to set multiple cable switches; the more gears the transmission has, the more combinations of pulling the cables, and the more complex the operation; after long-term use, when the control cable elongates, it is easy to produce gear knocking during shifting. Summary of the Invention

[0004] The purpose of the present utility model is to provide a multi-gear transmission for electronic shifting of a tricycle in view of the problems existing in the prior art. The tricycle includes a fuel tricycle motorcycle and an electric tricycle. The gear controller of the transmission identifies the set gear of the button switch, controls the shifting motor to drive the shifting hub to rotate to a specific position. The guiding cam groove provided on the shifting hub drives the U-shaped bracket and the fork to move axially along the fork support shaft, and the fork drives the shifting mechanism to engage with a specific gear to complete the shifting of the tricycle.

[0005] The technical solution of the present utility model is realized as follows:

[0006] The multi-speed transmission assembly with electronic gear shifting for a tricycle includes a housing and a transmission device. The transmission device includes an input gear shaft, a first transmission shaft, and a second transmission shaft. The input driven gear on the first transmission shaft meshes with the input driving gear on the input gear shaft. The first-gear driving gear on the first transmission shaft meshes with the first-gear driven gear on the second transmission shaft. A second-third gear shifting mechanism is provided between the second-gear driving gear and the third-gear driving gear on the first transmission shaft for engaging with the second-gear driving gear or the third-gear driving gear. The second-gear driven gear on the second transmission shaft meshes with the second-gear driving gear, and the third-gear driven gear meshes with the third-gear driving gear. A first-gear shifting mechanism is provided on the second transmission shaft, and this first-gear shifting mechanism is used to engage with the first-gear driven gear. An output gear is provided on the second transmission shaft and meshes with the reduction driven gear of the differential.

[0007] The first-gear shifting mechanism and the second-third gear shifting mechanism are respectively connected to a fork driving mechanism through a shift fork. The fork driving mechanism includes a shift fork support shaft, at least two U-shaped brackets, and a shift hub. The shift fork support shaft is a fixed shaft fixedly connected to the housing. The U-shaped brackets and the shift forks are all slidably fitted on the shift fork support shaft and can move axially. The shift forks are located inside the U-shaped brackets and are circumferentially positioned with the U-shaped brackets through positioning pins. The shift hub is provided with at least two guiding cam grooves extending circumferentially. The guiding pins provided at the top ends of the U-shaped brackets are respectively slidably fitted with the guiding cam grooves. The shift hub is fixed on a rotating shaft, and the rotating shaft is driven by a shift motor. The shift motor is electrically connected to a button switch for controlling the gear through a gear controller.

[0008] Preferably, shaft holes slidably fitted with the shift fork support shaft are respectively provided on the two side arms of the U-shaped bracket, and a strip-shaped hole parallel to the shift fork support shaft is provided at the connecting portion between the two side arms. The positioning pin provided on the shift fork is slidably fitted with the strip-shaped hole to form a circumferential positioning that can move axially.

[0009] Preferably, an adjusting spring is provided inside the opening of the U-shaped bracket. The adjusting spring is sleeved on the shift fork support shaft and is located between the side arm of the U-shaped bracket and the shift fork.

[0010] Preferably, there is one adjusting spring provided on one side of the shift fork, or there are two adjusting springs respectively provided on both sides of the shift fork.

[0011] Preferably, a sliding baffle is provided between the adjusting spring and the shift fork. The sliding baffle is slidably fitted with the guiding chute provided on the U-shaped bracket and the shift fork support shaft.

[0012] Preferably, the rotating shaft is supported in the housing cavity through a bearing. A shift driven gear is provided at one end of the rotating shaft, and this shift driven gear is used to mesh with the shift driving gear provided on the motor shaft.

[0013] Preferably, the axial direction of the shift motor is parallel to the axial direction of the rotating shaft, and the shift driving gear and the shift driven gear are spur gears; alternatively, the axial direction of the shift motor is vertically staggered with the axial direction of the rotating shaft, the shift driving gear is a worm, and the shift driven gear is a worm gear.

[0014] Preferably, the housing includes a left housing and a right housing. An electric motor installation bin separated from the inner cavity of the housing is arranged on the left housing or the right housing. The shift motor is arranged in the electric motor installation bin and meshes with a shift driven gear connected to the shift hub through a shift driving gear arranged on the motor shaft. The electric motor installation bin is covered with an end cover, and the left housing and the right housing are connected by bolts.

[0015] Preferably, a gear position locking mechanism is further included. The gear position locking mechanism includes a positioning structure arranged on the rotating shaft and an elastic locking device arranged on the housing. The elastic locking device cooperates with the positioning structure to lock the gear position.

[0016] Preferably, the positioning structure is a plurality of positioning grooves arranged circumferentially on the rotating shaft. The elastic locking device is composed of a limit steel ball, a compression spring, and a locking screw. The limit steel ball and the compression spring are sequentially assembled in the holes on the housing wall. The limit steel ball cooperates with the positioning groove for positioning, and the locking screw is in threaded fit in the hole to press against the compression spring; alternatively, the positioning structure is a positioning disk with a plurality of positioning grooves arranged circumferentially. The positioning disk is fixedly connected to the rotating shaft. The elastic locking device is composed of a limit pin, a compression spring, and a locking screw. The limit pin and the compression spring are sequentially assembled in the holes on the housing wall. The limit pin cooperates with the positioning groove on the positioning disk for positioning, and the locking screw is in threaded fit in the hole to press against the compression spring.

[0017] With the above scheme, the gear position controller identifies the gear position setting of the button switch, controls the shift motor to drive the shift hub to rotate. The guide cam groove has a clearance fit with the pin at the top of the shift fork support. When the shift hub rotates, the shift fork support drives the shift fork to axially slide on the shift fork support shaft, so that the shift fork drives the shift mechanism to engage with the specific gear position gear, realizing automatic shifting; in the present utility model, multiple guide cam grooves can be arranged on the shift hub, and each guide cam groove cooperates with the corresponding shift fork support to realize multiple shift forks driving multiple shift mechanisms to engage with different gears to realize multi-gear shifting.

[0018] In addition, when shifting gears, if the shift mechanism cannot move in place due to the alignment of the gear driving tooth and the gear driven tooth, the adjusting spring arranged in the shift fork support can play an adjusting role. When the driving tooth and the driven tooth can be engaged, the shift mechanism completes the displacement under the action of the adjusting spring and completes the gear engagement.

[0019] In addition, the gear position is locked through the mutual cooperation of the positioning structure and the elastic locking device, making up for the deficiency of the locking force when only using the shift motor to lock the gear position.

[0020] Therefore, the utility model controls the electronic gear shifting of the transmission by pressing the gear position of the button switch. Compared with the traditional gear shifting method of pulling the handle of the tricycle and operating the gear shift lever, the utility model can realize the electronic gear shifting to the specified gear position, reduce the working pressure of the driver during the driving process, reduce the learning cost of the user, and improve the driving safety of the tricycle; by arranging a plurality of guiding cam grooves in the circumferential direction of the convex hub, cooperating with a plurality of sets of fork supports and forks, and simultaneously driving a plurality of shifting mechanisms to engage with specific gears, the multi-gear shifting of the transmission is realized; the adjusting spring can make the flexible combination between the shifting mechanism and the gear position gear. Especially when the driving gear of the gear position is aligned with the driven gear of the gear position, the flexible combination of the shifting mechanism and the gear position gear can avoid the direct collision contact between the gears, avoid the generation of noise and improve the service life of the transmission; the fork is circumferentially fixed by the U-shaped bracket and indirectly connected with the shifting hub, preventing the friction between the fork and other components under the action of the rotation of the shifting mechanism, and improving the service life of the transmission. Description of the Drawings

[0021] Figure 1 is the front view of the internal structure of the utility model;

[0022] Figure 2 is the rear view of the internal structure of the utility model;

[0023] Figure 3 is the structural schematic diagram of the housing of the utility model;

[0024] Figure 4 The assembly schematic diagram of the fork in the utility model;

[0025] Figure 5 is the structural schematic diagram of Embodiment 2 of the utility model;

[0026] Figure 6 is the structural schematic diagram of Embodiment 3 of the utility model;

[0027] Figure 7 is the structural schematic diagram of Embodiment 4 of the utility model;

[0028] Figure 8 is the schematic diagram of the neutral state of the transmission device in the utility model;

[0029] Figure 9 is the schematic diagram of the first gear state of the transmission device in the utility model;

[0030] Figure 10 is the schematic diagram of the second gear state of the transmission device in the utility model;

[0031] Figure 11 is the schematic diagram of the third gear state of the transmission device in the utility model;

[0032] Figure 12 It is a structural schematic diagram of the prior art. Specific embodiments

[0033] In this embodiment, the so-called tricycle includes a fuel-powered three-wheeled motorcycle and an electric tricycle.

[0034] Embodiment 1: Refer to Figures 1 to 4 , a multi-speed transmission assembly for electronic gear shifting of a tricycle, including a housing 231 and a transmission device;

[0035] The housing 231 includes: a left housing 232 and a right housing 233; a motor installation chamber 234 separated from the inner cavity of the housing 231 is provided on the left housing 232 or the right housing 233. The purpose of separating the motor installation chamber 234 from the inner cavity of the housing 231 is to prevent the gear oil in the housing 231 from affecting the normal operation of the shift motor 201. The shift motor 201 is arranged in the motor installation chamber 234 and is engaged with a shift driven gear 205 connected to a shift hub 203 through a shift driving gear 204 provided on the motor shaft. The motor installation chamber 234 is covered with an end cover. The reason for using the end cover is to facilitate the installation and debugging of the internal components of the transmission. The left housing 232 and the right housing 233 are connected by bolts.

[0036] The transmission device includes: an input gear shaft 202, a first transmission shaft 208, and a second transmission shaft 210; an input driven gear 209 on the first transmission shaft 208 is engaged with an input driving gear 226 on the input gear shaft 202. A first-gear driving gear 215 on the first transmission shaft 208 is engaged with a first-gear driven gear 220 on the second transmission shaft 210. A second-third gear shift mechanism is provided between a second-gear driving gear 212 and a third-gear driving gear 216 on the first transmission shaft 208 for engaging with the second-gear driving gear 212 or the third-gear driving gear 216. A second-gear driven gear 211 on the second transmission shaft 210 is engaged with the second-gear driving gear 212, and a third-gear driven gear 223 is engaged with the third-gear driving gear 216. A first-gear shift mechanism is provided on the second transmission shaft 210, and this first-gear shift mechanism is used to engage with the first-gear driven gear 220. An output gear 221 is provided on the second transmission shaft 210 and is engaged with a reduction driven gear 224 of the differential. The output gear 221 is engaged with the reduction driven gear 224 provided in the differential, and power is output to the tricycle half shaft through a half shaft gear 236 provided in the differential.

[0037] The second and third gear shifting mechanism includes a first spline hub 214 and a first shift sleeve 213. The splines on the inner wall of the first spline hub 214 are engaged with the splines on the first transmission shaft 208, and the splines on the outer wall are engaged with the splines on the first shift sleeve 213. The first gear shifting mechanism includes a second spline hub 225 and a second shift sleeve 219. The splines on the inner wall of the second spline hub 225 are engaged with the splines on the second transmission shaft 210, and the splines on the outer wall are engaged with the splines on the second shift sleeve 219.

[0038] The first gear shifting mechanism and the second and third gear shifting mechanism are respectively connected to the fork driving mechanism through a first gear shift fork 218 and a second and third gear shift fork 217. The fork driving mechanism includes a fork support shaft 207, at least two U-shaped brackets 228, and a shift hub 203. The fork support shaft 207 is a fixed shaft fixedly connected to the housing 231. The U-shaped brackets 228 and the shift forks are all slidably fitted on the fork support shaft 207 and can move axially. The shift forks are located inside the U-shaped brackets 228 and are circumferentially positioned with the U-shaped brackets 228 through positioning pins 237. The shift hub 203 is provided with at least two guiding cam grooves 239 extending circumferentially. The guiding pins 238 provided at the tops of the U-shaped brackets 228 are respectively slidably fitted with the guiding cam grooves 239. The shift hub 203 is fixed on a rotating shaft 206. The rotating shaft 206 is supported in the cavity of the housing 231 through bearings. One end of the rotating shaft 206 is provided with a shift driven gear 205, which is used to engage with a shift driving gear 204 provided on the motor shaft. The shift motor 201 is axially parallel to the axial direction of the rotating shaft 206. The shift driving gear 204 and the shift driven gear 205 are spur gears. The rotating shaft 206 is driven by a shift motor 201. The shift motor 201 is electrically connected to a button switch 227 for controlling the gear through a gear position controller 222.

[0039] The button switch 227 is provided with gear buttons corresponding to the variable gears of the transmission. When a gear button is pressed, the gear position controller 222 will identify the gear position of the button switch 227 and control the rotation of the shift driving gear 204 of the shift motor 201. The button switch 227 can be provided on the handlebar or the instrument console of the tricycle.

[0040] The gear positions are circumferentially distributed along the contour of the cam groove 239 provided on the shift cam 203. Each cam groove 239 controls 1 to 2 gears respectively. When the shift cam 203 rotates to the corresponding gear position, the gear shifting is completed. The spaces between the gear positions are neutral positions. When the shift cam 203 rotates in the same direction, the shifting of different gears can be completed.

[0041] The two side arms of the U-shaped bracket 228 are respectively provided with shaft holes that slide with the fork support shaft 207, and the connecting portion 249 between the two side arms is provided with a strip hole 240 parallel to the fork support shaft 207. The positioning pin 238 provided on the fork 229 slides with the strip hole 240 to form a circumferential positioning that can be axially moved; an adjustment spring 230 is provided in the opening of the U-shaped bracket 228, and the adjustment spring 230 is sleeved on the fork support shaft 207 and is located between the side arms of the U-shaped bracket 228 and the fork; the adjustment spring 230 is one and is arranged on one side of the shift fork, or the adjusting spring 230 is two and is arranged on both sides of the shift fork respectively. A sliding baffle 236 is arranged between the adjusting spring 230 and the shift fork. The sliding baffle 236 is slidably matched with the guide groove 250 and the shift fork supporting shaft 207 arranged on the U-shaped bracket 228. The sliding baffle 236 is used to make up for the insufficient contact area between the shift fork and the adjusting spring 230, and prevent direct friction between the adjusting spring 230 and the shift fork, which affects the service life of the shift fork and the adjusting spring 230.

[0042] Example 2: See Figure 5 , and also includes a gear locking mechanism, which includes a positioning structure 241 arranged on the rotating shaft 206 and an elastic locking device 242 arranged on the shell, the elastic locking device 242 cooperates with the positioning structure 241 to lock the gear, the positioning structure 241 is a plurality of positioning grooves 248 circumferentially arranged on the rotating shaft 206, the elastic locking device 242 is composed of a limiting steel ball 243, a compression spring 244, and a locking screw 245, the limiting steel ball 243 and the compression spring 244 are sequentially assembled in the holes on the shell wall, the limiting steel ball 243 cooperates with the positioning groove 248 for positioning, and the locking screw 245 is threadedly engaged in the hole to resist the compression spring 244, so as to make up for the defect of insufficient locking force when the shifting motor 201 is used to fix the rotating shaft 206 circumferentially.

[0043] Example 3: See Figure 6 , and also includes a gear locking mechanism, which includes a positioning structure 241 arranged on the rotating shaft 206 and an elastic locking device 242 arranged on the shell, the elastic locking device 242 cooperates with the positioning structure 241 to lock the gear, the positioning structure 241 is a positioning plate 247 with a plurality of positioning grooves 251 circumferentially provided, the positioning plate 247 is fixedly connected to the rotating shaft 206, the elastic locking device 242 is composed of a limiting nail 246, a compression spring 244, and a locking screw 245, the limiting nail 246 and the compression spring 244 are sequentially assembled in the hole on the shell wall, the limiting nail 246 cooperates with the positioning groove 251 on the positioning plate 247 for positioning, and the locking screw 245 is threadedly engaged in the hole to resist the compression spring 244, so as to make up for the defect of insufficient locking force when the shift motor 201 is used to fix the rotating shaft 206 circumferentially.

[0044] Embodiment 4: Refer to Figure 7 , on the basis of Embodiment 2, the axial direction of the shift motor 201 is vertically staggered with the axial direction of the rotating shaft 206, the shift driving gear 204 is a worm, and the shift driven gear 205 is a worm wheel.

[0045] During operation, the gear position controller 222 identifies the gear position where the button switch 227 is located, controls the shift driving gear 204 of the shift motor 201, drives the shift driven gear 205 arranged on the rotating shaft 204 to rotate, so that the shift hub 203 rotates to a specific position, and the gear position is locked by the gear position locking mechanism; the guide pin 238 is in clearance fit with the cam groove 239 arranged on the shift hub 203, and the shift hub 203 drives the shift forks to move axially along the shift fork support shaft 207 through the U-shaped bracket 228 to achieve gear shifting.

[0046] In the neutral state: As Figure 8 shown, the second and third gear shift mechanisms and the first gear shift mechanism are not engaged with the gears. The power is input from the input gear shaft 202, passes through the input driving gear 226, the input driven gear 209, the first transmission shaft 208, the first gear driving gear 215, and the first gear driven gear 220, but the first gear shift mechanism is not engaged with the first gear driven gear 220, and the power cannot be input to the output gear 221;

[0047] In the first gear state: As Figure 9 shown, the second and third gear shift mechanisms are not engaged with the gears, and the first gear shift mechanism is engaged with the first gear driven gear 220. The power is input from the input gear shaft 202, passes through the input driving gear 226, the input driven gear 209, the first transmission shaft 208, the first gear driving gear 215, the first gear driven gear 220, the second transmission shaft 210, the output gear 221, and the reduction driven gear 224, and the power is transmitted to the rear axle shaft of the tricycle;

[0048] In the second gear state: As Figure 10 shown, the second and third gear shift mechanisms are engaged with the second gear driving gear 212, and the first gear shift mechanism is not engaged with the gears. The power is input from the input gear shaft 202, passes through the input driving gear 226, the input driven gear 209, the first transmission shaft 208, the second gear driving gear 212, the second gear driven gear 211, the second transmission shaft 210, the output gear 221, and the reduction driven gear 224, and the power is transmitted to the rear axle shaft of the tricycle;

[0049] In the third gear state: As Figure 11As shown, the second and third gear shifting mechanism meshes with the third gear driving gear 216, and the first gear shifting mechanism does not mesh with the gear. The power is input from the input gear shaft 202, and is transmitted to the rear axle shaft of the tricycle through the input driving gear 226, the input driven gear 209, the first transmission shaft 208, the third gear driving gear 216, the third gear driven gear 223, the second transmission shaft 210, the output gear 221, and the reduction driven gear 224.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make modifications to the present invention without departing from the spirit of the present invention, and such modifications fall within the protection scope of the present invention.

Claims

1. The multi-speed transmission assembly with electronic gear shifting for a tricycle, comprising a housing (231) and a transmission device, characterized in that: The transmission device includes: an input gear shaft (202), a first transmission shaft (208), and a second transmission shaft (210); the input driven gear (209) on the first transmission shaft (208) meshes with the input driving gear (226) on the input gear shaft (202), the first gear driving gear (215) on the first transmission shaft (208) meshes with the first gear driven gear (220) on the second transmission shaft (210), a second and third gear shifting mechanism is provided between the second gear driving gear (212) and the third gear driving gear (216) on the first transmission shaft (208) for engaging with the second gear driving gear (212) or the third gear driving gear (216), the second gear driven gear (211) on the second transmission shaft (210) meshes with the second gear driving gear (212), the third gear driven gear (223) meshes with the third gear driving gear (216), a first gear shifting mechanism is provided on the second transmission shaft (210), and this first gear shifting mechanism is used for engaging with the first gear driven gear (220); an output gear (221) is provided on the second transmission shaft (210) and meshes with the reduction driven gear (224) of the differential. The first gear shifting mechanism and the second and third gear shifting mechanisms are respectively connected to a fork driving mechanism through a shift fork. The fork driving mechanism includes a shift fork support shaft (207), at least two U-shaped brackets (228), and a shift hub (203). The shift fork support shaft (207) is a fixed shaft fixedly connected to the housing (231). The U-shaped brackets (228) and the shift forks are all in sliding fit on the shift fork support shaft (207) and can move axially. The shift forks are located inside the U-shaped brackets (228) and are circumferentially positioned with the U-shaped brackets (228) through positioning pins (237). The shift hub (203) is provided with at least two guiding cam grooves (239) extending in the circumferential direction. The guiding pins (238) provided at the top ends of the U-shaped brackets (228) are respectively in sliding fit with the guiding cam grooves (239). The shift hub (203) is fixed on a rotating shaft (206), and the rotating shaft (206) is driven by a shift motor (201). The shift motor (201) is electrically connected to a button switch (227) for controlling the gear through a gear controller (222).

2. The multi-speed transmission assembly with electronic shift for a tricycle according to claim 1, characterized in that: Axial holes for sliding fit with the shift fork support shaft (207) are respectively provided on the two side arms of the U-shaped bracket (228), and a strip-shaped hole (240) parallel to the shift fork support shaft (207) is provided at the connecting part (249) between the two side arms. The positioning pin (237) provided on the shift fork is in sliding fit with the strip-shaped hole (240) to form a circumferential positioning that can move axially.

3. The multi-speed transmission assembly with electronic gear shifting for a tricycle according to claim 1, characterized in that: An adjusting spring (230) is arranged inside the opening of the U-shaped bracket (228). The adjusting spring (230) is sleeved on the shift fork support shaft (207) and is located between the side arm of the U-shaped bracket (228) and the shift fork.

4. The multi-speed transmission assembly with electronic gear shifting for a tricycle according to claim 3, characterized in that: There is one adjusting spring (230) arranged on one side of the shift fork, or there are two adjusting springs (230) respectively arranged on both sides of the shift fork.

5. The multi-speed transmission assembly with electronic gear shifting for a tricycle according to claim 3, characterized in that: A sliding baffle (236) is provided between the adjusting spring (230) and the shift fork, and the sliding baffle (236) is slidably matched with a guide slot (250) provided on the U-shaped bracket (228) and a shift fork support shaft (207).

6. The multi-speed transmission assembly with electronic gear shift for a tricycle according to claim 1, characterized in that: The rotating shaft (206) is supported in the housing (231) cavity via a bearing, and a shift driven gear (205) is provided at one end of the rotating shaft (206). The shift driven gear (205) is used to mesh with a shift driving gear (204) provided on the motor shaft.

7. The multi-speed transmission assembly with electronic gear shifting for a tricycle according to claim 6, characterized in that: The axial direction of the gear shift motor (201) is arranged parallel to the axial direction of the rotating shaft (206), and the gear shift driving gear (204) and the gear shift driven gear (205) are spur gears; or, the axial direction of the gear shift motor (201) is arranged perpendicularly and staggered to the axial direction of the rotating shaft (206), the gear shift driving gear (204) is a worm, and the gear shift driven gear (205) is a worm wheel.

8. The multi-speed transmission assembly with electronic gear shifting for a tricycle according to claim 1, characterized in that: The housing (231) comprises a left housing (232) and a right housing (233); a motor mounting chamber (234) separated from the inner cavity of the housing (231) is provided on the left housing (232) or the right housing (233); the shift motor (201) is arranged in the motor mounting chamber (234); a shift driving gear (204) provided on the motor shaft is meshed with a shift driven gear (205) connected to the shift hub (203); the motor mounting chamber (234) is covered with an end cover; and the left housing (232) and the right housing (233) are connected by bolts.

9. The multi-speed transmission assembly with electronic gear shift for a tricycle according to claim 1, characterized in that: It also includes a gear locking mechanism, which includes a positioning structure (241) arranged on the rotating shaft (206) and an elastic locking device (242) arranged on the housing, and the elastic locking device (242) cooperates with the positioning structure (241) to lock the gear.

10. The multi-speed transmission assembly with electronic gear shift for a tricycle according to claim 9, characterized in that: The positioning structure (241) is a plurality of positioning grooves (248) arranged circumferentially on the rotating shaft (206); the elastic locking device (242) is composed of a limiting steel ball (243), a compression spring (244), and a locking screw (245); the limiting steel ball (243) and the compression spring (244) are sequentially assembled in the hole on the shell wall; the limiting steel ball (243) cooperates with the positioning groove (248) for positioning; the locking screw (245) is threadedly engaged in the hole to resist the compression spring (244); or the positioning structure (241) is a circumferential A positioning plate (247) is provided with a plurality of positioning grooves (251), the positioning plate (247) is fixedly connected to the rotating shaft (206), the elastic locking device (242) is composed of a limiting pin (246), a compression spring (244), and a locking screw (245), the limiting pin (246) and the compression spring (244) are sequentially assembled in holes on the shell wall, the limiting pin (246) cooperates with the positioning grooves (251) on the positioning plate (247) for positioning, and the locking screw (245) is threadedly engaged in the hole to resist the compression spring (244).

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