An electrically controlled variable speed electric assist system

Abstract

The present application relates to gearbox technical field, especially point to a kind of electric control variable speed electric power-assisted system, including speed changer, speed changer includes box, main shaft and auxiliary shaft, main shaft gear, auxiliary shaft gear and ratchet wheel;It also includes electric power-assisted system and electronic gear shifting control system.The present application makes bicycle when riding, rider can easily ride, it effectively saves the physical strength of rider, makes rider obtain good riding experience;Speed changer shifts, its control is convenient, gear shifting is reliable, can realize electronic control and accurate positioning, can set after starting automatic reset and positioning gear, enhance the convenience and experience of use;Meanwhile, elastic drum stick mechanism has elasticity, so that elastic yoke mechanism and ratchet wheel have give place effect, can avoid the phenomenon of tooth striking or jamming when gear is entered, to improve the service life of the electric control variable speed electric power-assisted system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gearbox, in particular to an electric control variable speed electric power-assisted system. BACKGROUND

[0002] In the gearbox of the variable gear bicycle, the transmission change between different gear pairs of the gearbox is controlled by adjusting the variable speed control mechanism to realize the variable gear function. In most of the bicycle gearboxes, the following problems exist:

[0003] (1) When riding a bicycle, the rider provides all the power through the pedaling force. In the case of heavy load or large slope, the rider is easily tired, which is not conducive to long-term riding and heavy load; (2) The pull wire is used to control the variable gear, which needs to be wound around the variable gear and needs to set the pull wire adjusting device to adjust the tension of the pull wire, and needs to set the pull wire controller to control the pull wire to realize the variable gear. In the use process, the pull wire may be loose due to deformation and other reasons, and needs to be re-adjusted. This is operable and enjoyable for professional enthusiasts. However, for some primary users, it is difficult to re-tighten the pull wire, which is not convenient;

[0004] (3) The variable gear control mechanism of the gearbox uses a rigid mechanism. When the fork drives the ratchet and gear to engage into the gear, the ratchet and gear end face teeth are easily hard-topped, which may cause tooth impact or jamming. When the ratchet and gear are disengaged, the ratchet is easily hard-pulled, which may cause damage to the teeth, affecting the service life of the gearbox.

[0005] Therefore, based on the above-mentioned deficiencies of the existing variable gear bicycle gearbox, a solution is needed to overcome the above technical problems. SUMMARY

[0006] The present application provides an electric control variable speed electric power-assisted system.

[0007] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0008] The present application provides an electric control variable speed electric power-assisted system, which comprises a variable speed device, the variable speed device comprising a gearbox, a main shaft and a secondary shaft installed side by side in the gearbox, at least one main shaft gear provided on the main shaft, a secondary shaft gear provided on the secondary shaft and engaged with the main shaft gear, a ratchet provided on the main shaft and engaged with the main shaft gear, or / and a ratchet provided on the secondary shaft and engaged with the secondary shaft gear; further comprising an electric power-assisted system and an electronic variable gear control system.

[0009] The electric power-assisted system comprises a power-assisted motor, an electric power-assisted control system and a sensor, the power-assisted motor and the sensor are electrically connected with the electric power-assisted control system, and the power-assisted motor is drivingly connected with the main shaft or the auxiliary shaft.

[0010] The electronic gear shifting control system comprises a shifting fork mechanism drivingly connected with the ratchet wheel, an elastic drum stick mechanism for driving the shifting fork mechanism to drive the ratchet wheel to engage with the main shaft gear or the auxiliary shaft gear, a gear shifting motor for driving the elastic drum stick mechanism to rotate, and an electronic gear shifting control system for controlling the rotation angle displacement of the gear shifting motor.

[0011] The electric power-assisted system further comprises a speed reduction device, the speed reduction device comprises a speed reduction installation shaft, a first gear and an output gear installed on the speed reduction installation shaft, the power-assisted motor is connected with a second gear, the first gear is engaged with the second gear, the output gear is engaged with the main shaft gear or the auxiliary shaft gear, and a one-way bearing or a ratchet pawl is installed in the first gear.

[0012] The electronic gear shifting control system further comprises a gear shifting transmission gear set, the gear shifting transmission gear set comprises a gear shifting driven gear drivingly connected with the elastic drum stick mechanism and a gear shifting driving gear drivingly connected with the gear shifting motor, and the gear shifting driven gear is engaged with the gear shifting driving gear.

[0013] The elastic drum stick mechanism comprises a drum stick shaft, a drum stick sleeve movably sleeved on the drum stick shaft and a position allowing resetting elastic member for resetting the drum stick sleeve after the position allowing movement of the drum stick sleeve, and the drum stick sleeve is provided with a drum stick gear shifting boss.

[0014] The shifting fork mechanism comprises a shifting fork installation frame, a shifting fork movably installed on the shifting fork installation frame and a shifting fork resetting elastic member for driving the shifting fork to reset, the upper end of the shifting fork is provided with a shifting fork gear shifting convex column, and the shifting fork gear shifting convex column is located at the drum stick gear shifting boss of the drum stick sleeve.

[0015] The position allowing resetting elastic member is a compression spring, two compression springs are provided, and the two compression springs are sleeved on the two ends of the drum stick shaft and abut against the drum stick sleeve.

[0016] The two ends of the compression spring are provided with gaskets, the gaskets are sleeved on the drum stick shaft, and the gasket close to the drum stick sleeve abuts against the drum stick sleeve.

[0017] The shifting fork installation frame is provided with an installation slot penetrating through the shifting fork installation frame, and the upper end of the shifting fork penetrates through the installation slot and extends to the drum stick sleeve.

[0018] The shifting fork installation frame is provided with an installation seat and a positioning pile, the installation seat and the positioning pile are located on the two sides of the installation slot respectively, one end of the shifting fork resetting elastic member is installed on the installation seat, and the other end of the shifting fork resetting elastic member clamps the shifting fork and the positioning pile.

[0019] The yoke mounting frame comprises a crossbeam part and a downward protruding part protruding downward from the crossbeam part, the downward protruding part is provided with a downward recessed mounting cavity, the mounting groove is communicated with the mounting cavity, the mounting seat and the positioning pile are respectively located on the top surface of the two side walls of the mounting cavity, and the yoke reset elastic member is located in the mounting cavity.

[0020] The lower end of the yoke part is provided with a lower fork part, the inner side of the two ends of the lower fork part is provided with a pull pile, and the pull pile is movably arranged in the yoke groove on the surface of the ratchet wheel.

[0021] The beneficial effects of the present application are as follows:

[0022] (1) The electric control variable speed electric power-assisted system is applied to a bicycle, when a rider rides, a sensor detects the torque and other riding information applied to the pedal by the rider, the electric power-assisted control system adjusts the power output of the power-assisted motor according to the current riding information, and then drives the main shaft or the secondary shaft to rotate, thereby providing riding assistance to the rider, so that the rider can easily ride the bicycle regardless of the load size and whether on a flat road or an inclined road, which effectively saves the physical strength of the rider and provides a good riding experience for the rider.

[0023] (2) The electronic gear shifting control system is adopted to control the rotational angular displacement of the gear shifting motor, and only the rotational angular displacement of the gear shifting motor corresponding to each gear position of the variable speed device needs to be set to achieve precise control. When gear shifting is needed, the electronic gear shifting control system precisely controls the rotational angular displacement of the gear shifting motor, the gear shifting motor drives the corresponding rotation of the elastic drum rod mechanism, the elastic drum rod mechanism drives the movement of the yoke mechanism, so that the ratchet wheel is engaged with the main shaft gear or the secondary shaft gear to achieve gear shifting. The control is convenient and reliable, and compared with the existing pull wire control gear shifting, the structure is simple, electronic control and precise positioning can be achieved, automatic resetting and positioning of the gear position after starting can be set, and the convenience and experience of use are enhanced.

[0024] (3) The electronic gear shifting control system adopts the elastic drum rod mechanism to drive the movement of the yoke mechanism, and then drives the ratchet wheel to engage with the main shaft gear or the secondary shaft gear. The elastic drum rod mechanism has a certain elasticity, so that the yoke mechanism and the ratchet wheel have a yielding effect, and the yoke mechanism has a force relieving effect when driving the ratchet wheel to engage with the main shaft gear or the secondary shaft gear, thereby avoiding the hard top of the ratchet wheel and the main shaft gear or the secondary shaft gear end surface teeth and the occurrence of gear tooth or jamming, and avoiding damage to the ratchet teeth, thereby improving the service life of the electric control variable speed electric power-assisted system. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application.

[0026] Figure 2This is a three-dimensional structural diagram of the electronic gear shifting control system described in this invention.

[0027] Figure 3 This is a three-dimensional structural diagram of the electronic gear shifting control system described in this invention from another perspective.

[0028] Figure 4 This is a three-dimensional structural diagram of the elastic drumstick mechanism described in this invention.

[0029] Figure 5 This is a three-dimensional structural diagram of the shift fork mechanism described in this invention.

[0030] Figure 6 This is a three-dimensional structural diagram of the shift fork mounting bracket described in this invention. Detailed Implementation

[0031] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0032] refer to Figures 1 to 6 As shown, an electric power assist system with electronic transmission includes a transmission device, which includes a housing, a main shaft 05 and a countershaft 06 mounted side-by-side on the housing, at least one main shaft gear 07 on the main shaft 05, a countershaft gear 08 meshing with the main shaft gear 07 on the countershaft 06, a ratchet 01 slidably mounted on the main shaft 05 and meshing with the main shaft gear 07, and / or a ratchet 01 meshing with the countershaft gear 08 mounted on the countershaft 06; it also includes an electric power assist system and an electronic gear shifting system;

[0033] The electric assist system includes an assist motor 100, an electric assist control system, and a sensor. The assist motor 100 and the sensor are both electrically connected to the electric assist control system. The assist motor 100 is driven by the main shaft 05 or the auxiliary shaft 06.

[0034] The electronic shift control system includes a shift fork mechanism 2 driven by a ratchet 01, an elastic drum mechanism 1 for driving the shift fork mechanism 2 to engage the ratchet 01 with the main shaft gear 07 or the secondary shaft gear 08, a shift motor 7 for driving the elastic drum mechanism 1 to rotate, and an electronic shift control system 10 for controlling the rotational angular displacement of the shift motor 7.

[0035] Specifically, the electric power-assisted control system can be implemented by using a control circuit board, a motor controller, a PLC gear shifting control system or a single-chip microcomputer, etc.; the electronic gear shifting control system 10 can be implemented by using a control circuit board, a motor driver, a PLC gear shifting control system or a single-chip microcomputer, etc.; the sensor can be one or more of a pedal frequency sensor, a torque sensor and a speed sensor; all of them can be implemented by using existing technologies, and thus no further description is given.

[0036] In this embodiment, the electronic gear shifting control system 10 can also be provided with a Bluetooth module. The Bluetooth module can be provided in the electronic gear shifting control system 10 to control the gear shifting motor 7 through a Bluetooth signal connection; when in use, a Bluetooth pointer can be provided to send a Bluetooth pulse signal to the electronic gear shifting control system 10 to control the rotational angular displacement of the gear shifting motor 7.

[0037] In actual application, the electric power-assisted control system of the electrically controlled variable speed is applied to a bicycle. When a rider is riding, the sensor detects the torque and other riding information applied to the pedal by the rider, and the electric power-assisted control system adjusts the power output of the power-assisted motor 100 according to the current riding information, thereby driving the main shaft 05 or the secondary shaft 06 to rotate, so as to provide riding assistance to the rider, so that the rider can easily ride the bicycle regardless of the load size and whether on a flat road or an inclined road, which effectively saves the physical strength of the rider and provides a good riding experience for the rider.

[0038] The electronic gear shifting control system 10 is adopted to control the rotational angular displacement of the gear shifting motor 7 in the present application, and only the rotational angular displacement of the gear shifting motor 7 corresponding to each gear position of the variable speed device needs to be set to achieve precise control. When gear shifting is needed, the electronic gear shifting control system 10 precisely controls the rotational angular displacement of the gear shifting motor 7, the gear shifting motor 7 drives the corresponding rotation of the elastic drum stick mechanism 1, the elastic drum stick mechanism 1 drives the movement of the fork mechanism 2, so that the ratchet wheel 01 meshes with the main shaft gear 07 or the secondary shaft gear 08 to achieve gear shifting. The control is convenient, the gear shifting is reliable, and compared with the existing gear shifting controlled by a pull wire, the present application has a simple structure, can achieve electronic control and precise positioning, can be set to automatically reset and position the gear after starting, and enhances the convenience and experience in use.

[0039] The electronic gear shifting control system adopts the elastic drum stick mechanism 1 to drive the movement of the fork mechanism 2, and then drives the ratchet wheel 01 to mesh with the main shaft gear 07 or the secondary shaft gear 08 to shift in. The elastic drum stick mechanism 1 has a certain elasticity, so that the fork mechanism 2 and the ratchet wheel 01 have a yielding effect. When the fork mechanism 2 drives the ratchet wheel 01 to shift in and mesh with the main shaft gear 07 or the secondary shaft gear 08, there is a force relief effect, so that the ratchet wheel 01 and the main shaft gear 07 or the secondary shaft gear 08 end face ratchet teeth are not hard-topped to cause tooth impact or jamming, and the ratchet teeth are not damaged, thereby improving the service life of the electrically controlled variable speed electric power-assisted system.

[0040] In the embodiment, the electric assisting system further comprises a speed reduction device, which can be a multi-stage speed reduction device, a planetary speed reduction device, etc. The assisting motor 100 is drivingly connected to the main shaft 05 or the secondary shaft 06 through the speed reduction device.

[0041] In the embodiment, preferably, the speed reduction device comprises a speed reduction mounting shaft 101, a first gear 102 mounted on the speed reduction mounting shaft 101, and an output gear 103, the assisting motor 100 is connected with a second gear 104, the first gear 102 is engaged with the second gear 104, the output gear 103 is engaged with the main shaft gear 07 or the secondary shaft gear 08, and a one-way bearing or a ratchet pawl 105 is mounted in the first gear 102. Preferably, the output gear 103 is engaged with one of the secondary shaft gears 08. The assisting motor 100 drives the second gear 104 to rotate, the second gear 104 drives the first gear 102, the speed reduction mounting shaft 101, and the output gear 103 to rotate, and the output gear 103 drives the secondary shaft gear 08 and the secondary shaft 06 to rotate, thereby providing assistance for cycling. The one-way bearing or the ratchet pawl 105 mounted in the first gear 102 ensures that the first gear 102 does not rotate when the assisting motor 100 is not working, and the speed reduction mounting shaft 101 idles, so that the rider does not feel tired when pedaling due to motor magnetic resistance, and the rider can keep normal cycling even when the assisting motor 100 is powered off.

[0042] In the embodiment, according to the actual use requirements, the gear shifting motor 7 and the assisting motor 100 can be provided with a common battery as a power source, or the gear shifting motor 7 and the assisting motor 100 can be respectively provided with a battery as a power source.

[0043] In the embodiment, the electronic gear shifting control system further comprises a gear shifting transmission gear set 9, which comprises a gear shifting driven gear 91 drivingly connected with the elastic drum stick mechanism 1 and a gear shifting driving gear 92 drivingly connected with the gear shifting motor 7, and the gear shifting driven gear 91 is engaged with the gear shifting driving gear 92. Specifically, the gear shifting driving gear 92 and the gear shifting driven gear 91 are both conical gears, the gear shifting motor 7 is longitudinally arranged in the box, the structure is compact, and the transmission is reliable.

[0044] In this embodiment, the elastic drumstick mechanism 1 includes a drumstick shaft 11, a drumstick sleeve 12 movably sleeved on the drumstick shaft 11, and a repositioning elastic element 13 for resetting the drumstick sleeve 12 after it has moved. The drumstick sleeve 12 is provided with a drumstick shifting boss 121. The shift fork mechanism 2 includes a shift fork mounting bracket 21, a shift fork member 22 rotatably mounted on the shift fork mounting bracket 21, and a shift fork resetting elastic element 23 for driving the shift fork member 22 to reset. The upper end of the shift fork member 22 is provided with a shift fork shifting protrusion 221, which is located at the drumstick shifting boss 121 of the drumstick sleeve 12. Specifically, multiple sets of drumstick shifting protrusions 121 are arranged side by side, and each set of drumstick shifting protrusions 121 corresponds to each shift fork member 22. The shift fork 22 is rotatably mounted on the shift fork mounting bracket 21, and the ratchet 01 is connected to the shift fork 22.

[0045] In practical applications, the drumstick shaft 11 drives the drumstick sleeve 12 and the drumstick shifting boss 121 to rotate. The drumstick shifting boss 121 drives the shift fork 22 to rotate around the shift fork mounting bracket 21. The shift fork 22 drives the ratchet 01 to rotate, causing the ratchet 01 to approach the main shaft gear 07 or the counter-shaft gear 08 for engagement and gear shifting. During the rotation of the ratchet 01 driven by the shift fork 22, when the ratchet teeth of the ratchet 01 collide with the ratchet teeth of the main shaft gear 07 or the counter-shaft gear 08, the drumstick sleeve 12 moves on the drumstick shaft 11 and compresses the repositioning elastic member 13 to make way, thereby preventing the ratchet 01 from engaging with the main shaft gear 07 or the counter-shaft gear 08 or getting stuck during gear shifting; thus enabling the ratchet 01 to engage with the main shaft gear 07 or the counter-shaft gear 08 to achieve gear shifting. When shifting out of gear, the shift fork reset elastic element 23 drives the shift fork element 22 to reset, and the clearance reset elastic element 13 drives the drumstick sleeve 12 to move, thereby resetting the drumstick sleeve 12.

[0046] This invention employs a drumstick sleeve 12 that is slidably fitted onto the drumstick shaft 11, and a repositioning and resetting elastic element 13 that elastically drives the drumstick sleeve 12 to reposition and reset, thus giving the elastic drumstick mechanism elasticity. When the shift fork 22 drives the ratchet 01 to engage with the main shaft gear 07 or the secondary shaft gear 08, it has a force-dissipating effect, thereby preventing the ratchet 01 from hard-hitting the ratchet teeth on the end face of the main shaft gear 07 or the secondary shaft gear 08, which would cause tooth knocking or jamming; when the ratchet 01 disengages from the main shaft gear 07 or the secondary shaft gear 08, it can prevent the ratchet 01 from being pulled hard, which would damage the ratchet teeth.

[0047] This invention employs a rotatable connection between the shift fork 22 and the shift fork mounting bracket 21. The shift fork 22 exhibits low friction during oscillation, making it more flexible for the ratchet 01 to engage and disengage from the main shaft gear 07 or the secondary shaft gear 08. When the shift fork 22 oscillates relatively at a small angle relative to the shift fork mounting bracket 21, it can achieve a large displacement of the ratchet 01, resulting in low wear and a long service life. Furthermore, it minimizes the elastic deformation of the clearance reset elastic element 13 and the shift fork reset elastic element 23, preventing premature failure of the clearance reset elastic element 13 and the shift fork reset elastic element 23, and effectively extending the service life of the electric power assist system of this electronically controlled transmission.

[0048] In this embodiment, the two ends of the drumstick shaft 11 are mounted to the housing using bearings 14. The repositioning elastic element 13 is a compression spring, of which two springs are provided, sleeved on both ends of the drumstick shaft 11 and abutting against the drumstick sleeve 12. A washer 15 is provided at both ends of the compression spring, sleeved on the drumstick shaft 11, with the washer 15 near the drumstick sleeve 12 abutting against it. The compression spring abuts against the drumstick sleeve 12 via the washer 15. The washer 15 at both ends of the compression spring positions the compression spring and the drumstick sleeve 12.

[0049] In this embodiment, the shift fork mounting bracket 21 is provided with a mounting groove 211 that penetrates through the shift fork mounting bracket 21. The upper end of the shift fork 22 extends through the mounting groove 211 and reaches the drumstick sleeve 12. Specifically, the upper end of the shift fork 22 is rotatably mounted in the mounting groove 211 using a pivot. The mounting groove 211 facilitates the installation and positioning of the shift fork 22.

[0050] In this embodiment, the shift fork mounting bracket 21 is provided with a mounting base 212 and a positioning post 213. The mounting base 212 and the positioning post 213 are respectively located on both sides of the mounting groove 211. One end of the shift fork reset elastic member 23 is mounted on the mounting base 212, and the other end of the shift fork reset elastic member 23 clamps the shift fork member 22 and the positioning post 213. Specifically, the shift fork reset elastic member 23 is a torsion spring or a spring sheet.

[0051] In this embodiment, the shift fork mounting bracket 21 includes a crossbeam portion 214 and a lower protrusion 215 protruding downward from the crossbeam portion 214. The lower protrusion 215 is provided with a downwardly recessed mounting cavity 216. The mounting groove 211 communicates with the mounting cavity 216. The mounting seat 212 and the positioning post 213 are respectively located on the top surface of the two side walls of the mounting cavity 216. The shift fork reset elastic member 23 is located inside the mounting cavity 216, which facilitates the installation of the shift fork member 22 and the shift fork reset elastic member 23 and makes the shift fork mechanism 2 structure compact. With this mounting structure, a small deformation of the shift fork reset elastic member 23 can obtain a large left and right lateral oscillation rotation of the shift fork member 22, enabling more gear shifting adjustments in a smaller space. The structure is compact and orderly, ensuring structural stability while allowing for the manufacture of multi-gear miniaturized gearboxes, which has high practical value.

[0052] In the embodiment, the lower end of the shifting fork 22 is provided with a lower fork portion 222, the inner side of the two ends of the lower fork portion 222 is provided with a pull-out post 2221, and the pull-out post 2221 is movably arranged in the shifting fork groove 011 on the circumferential surface of the ratchet wheel 01.

[0053] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution of the present application, and any equivalent embodiment with equivalent changes is equivalent. Any simple modification, equivalent change and modification made to the above embodiment according to the present application are within the scope of the technical solution of the present application.

Claims

1. An electrically controlled variable speed electric assist system, comprising a variable speed device, the variable speed device comprising a box body, a main shaft (05) and a secondary shaft (06) installed side by side on the box body, at least one main shaft gear (07) is arranged on the main shaft (05), the secondary shaft (06) is provided with a secondary shaft gear (08) engaged with the main shaft gear (07), a ratchet wheel (01) engaged with the main shaft gear (07) is arranged on the main shaft (05) in a sliding manner, and / or a ratchet wheel (01) engaged with the secondary shaft gear (08) is installed on the secondary shaft (06); characterized in that: Also include electric power-assisted system and electronic gear shifting control system; The electric power-assisted system includes a power-assisted motor (100), an electric power-assisted control system and a sensor, the power-assisted motor (100) and the sensor are electrically connected with the electric power-assisted control system, the power-assisted motor (100) is drivingly connected with a main shaft (05) or a secondary shaft (06); The electronic gear shifting control system includes a shifting fork mechanism (2) drivingly connected with a ratchet wheel (01), an elastic drum stick mechanism (1) for driving the shifting fork mechanism (2) to drive the ratchet wheel (01) to engage with a main shaft gear (07) or a secondary shaft gear (08), a gear shifting motor (7) for driving the elastic drum stick mechanism (1) to rotate and an electronic gear shifting control system (10) for controlling the rotation angle displacement of the gear shifting motor (7); The elastic drum stick mechanism (1) includes a drum stick shaft (11), a drum stick sleeve (12) movably sleeved on the drum stick shaft (11) and a displacement reset elastic member (13) for resetting the drum stick sleeve (12) after displacement, the drum stick sleeve (12) is provided with a drum stick gear shifting boss (121). The shifting fork mechanism (2) includes a shifting fork mounting frame (21), a shifting fork (22) rotatably mounted on the shifting fork mounting frame (21) and a shifting fork reset elastic member (23) for driving the shifting fork (22) to reset, the upper end of the shifting fork (22) is provided with a shifting fork gear shifting convex column (221), the shifting fork gear shifting convex column (221) is located at the drum stick gear shifting boss (121) of the drum stick sleeve (12). The shifting fork mounting frame (21) is provided with a mounting groove (211) penetrating through the shifting fork mounting frame (21), the upper end of the shifting fork (22) penetrates through the mounting groove (211) and extends to the drum stick sleeve (12). The shifting fork mounting frame (21) is provided with a mounting seat (212) and a positioning pile (213), the mounting seat (212) and the positioning pile (213) are respectively located on both sides of the mounting groove (211), one end of the shifting fork reset elastic member (23) is mounted on the mounting seat (212), the other end of the shifting fork reset elastic member (23) clamps the shifting fork (22) and the positioning pile (213).

2. An electrically controlled variable speed electric assist system as recited in claim 1, wherein: The electric power-assisted system further includes a speed reduction device, the speed reduction device includes a speed reduction mounting shaft (101), a first gear (102) and an output gear (103) mounted on the speed reduction mounting shaft (101), the power-assisted motor (100) is connected with a second gear (104), the first gear (102) is engaged with the second gear (104), the output gear (103) is engaged with the main shaft gear (07) or the secondary shaft gear (08), a one-way bearing or a pawl (105) is mounted in the first gear (102).

3. The electrically controlled variable speed electric assist system of claim 1, wherein: The electronic gear shifting control system further includes a gear shifting transmission gear set (9), the gear shifting transmission gear set (9) includes a gear shifting driven gear (91) drivingly connected with the elastic drum stick mechanism (1) and a gear shifting driving gear (92) drivingly connected with the gear shifting motor (7), the gear shifting driven gear (91) is engaged with the gear shifting driving gear (92).

4. The electrically controlled variable speed electric assist system of claim 1, wherein: The yielding reset elastic member (13) is a compression spring, and two compression springs are arranged on both ends of the drum stick shaft (11) and abut against the drum stick sleeve (12).

5. An electrically controlled variable speed electric assist system as recited in claim 4 wherein: Both ends of the compression spring are provided with a gasket (15), the gasket (15) is sleeved on the drum stick shaft (11), and the gasket (15) close to the drum stick sleeve (12) abuts against the drum stick sleeve (12).

6. An electrically controlled variable speed electric assist system as recited in claim 1 wherein: The shift fork mounting frame (21) comprises a cross beam part (214) and a lower protruding part (215) protruding downward from the cross beam part (214), the lower protruding part (215) is provided with a downwardly recessed mounting cavity (216), the mounting groove (211) communicates with the mounting cavity (216), the mounting seat (212) and the positioning pile (213) are respectively located on the top surfaces of the two side walls of the mounting cavity (216), and the shift fork reset elastic member (23) is located in the mounting cavity (216).

7. An electrically controlled variable speed electric assist system as recited in claim 6 wherein: The lower end of the shift fork member (22) is provided with a lower fork part (222), the inner sides of both ends of the lower fork part (222) are provided with a pull pile (2221), and the pull pile (2221) is movably arranged in a shift fork groove (011) on the peripheral surface of the ratchet wheel (01).

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