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CN-224229220-U - Gear shifting controller for load speed change of gearbox

CN224229220UCN 224229220 UCN224229220 UCN 224229220UCN-224229220-U

Abstract

The utility model provides a gear shifting controller for load speed change of a gearbox, which comprises a cam, a guide rod, a shifting fork mechanism and a ratchet wheel, wherein the shifting fork mechanism is arranged on the guide rod, a plurality of cam grooves are formed in the cam, the cam grooves are circumferentially arranged on the periphery of the cam, one end of the shifting fork mechanism slides along the cam grooves in the cam, and the other end of the shifting fork mechanism is connected with the ratchet wheel and drives the ratchet wheel to move. According to the utility model, the ratchet wheel is provided with the pawl which moves unidirectionally, so that upshifting and downshifting can be realized under load on the basis of preventing tooth striking, and shifting is carried out without stopping feet when the bicycle is ridden.

Inventors

  • CAI MING

Assignees

  • 重庆宏福源科技有限公司

Dates

Publication Date
20260512
Application Date
20250526

Claims (9)

  1. 1. The gear shifting controller for the load speed change of the gearbox is characterized by comprising a cam (3), a guide rod (4), a shifting fork mechanism (7) and a ratchet wheel (8); The guide rod (4) is provided with a shifting fork mechanism (7), the cam (3) is provided with a plurality of cam grooves, the cam grooves are circumferentially arranged on the periphery of the cam (3), one end of the shifting fork mechanism (7) slides along the cam grooves on the cam (3), and the other end of the shifting fork mechanism is connected with the ratchet wheel (8) and drives the ratchet wheel (8) to move.
  2. 2. The transmission load shifting shift controller according to claim 1, wherein the ratchet wheel (8) includes a pawl (801), a wheel disc (802), a spacer (803), a pawl mounting groove (806), and a spring (808); a pawl mounting groove (806) is formed in the wheel disc (802), and the pawl (801) is axially and slidably mounted in the pawl mounting groove (806); One side of pawl mounting groove (806) is provided with gasket (803), gasket (803) fixed mounting is on rim plate (802), gasket (803) with be provided with between pawl (801) and be used for ejecting spring (808) of rim plate (802) terminal surface with pawl (801).
  3. 3. The gear shift controller for load shifting of a gearbox according to claim 2, wherein a limiting boss (805) is arranged on the side surface of the pawl (801), a sinking table (807) is arranged in the pawl mounting groove (806), and the pawl (801) is limited by interference of the limiting boss (805) and the sinking table (807) when the pawl (801) is completely hidden in the pawl mounting groove (806) against the elastic force of a spring (808).
  4. 4. A gear shift controller for a load change of a transmission according to claim 2, wherein the tooth surface of the pawl (801) is composed of a tooth slope (804) and a limit surface.
  5. 5. The gear shift controller for load shifting of a transmission according to claim 2, further comprising a main shaft (1), a counter shaft (2), a main shaft gear (5) and a counter shaft gear (6); One or more main shaft gears (5) are arranged on the main shaft (1), one or more auxiliary shaft gears (6) meshed with the main shaft gears (5) are arranged on the auxiliary shaft (2), and one or more ratchet wheels (8) are arranged on the main shaft (1) and/or the auxiliary shaft (2); The guide rod (4) drives the ratchet wheel (8) to move along the axial direction of the main shaft (1) or the auxiliary shaft (2) through the shifting fork mechanism (7), and the ratchet wheel (8) is allowed to be meshed with the main shaft gear (5) or the auxiliary shaft gear (6) through the pawl (801).
  6. 6. A gear shift control for a gearbox load change according to claim 5, characterized in that the end faces of the main shaft gear (5) and/or the auxiliary shaft gear (6) are provided with side teeth which mesh with a ratchet wheel (8).
  7. 7. A gear shift control for a load change of a gearbox according to claim 1, characterized in that the cam (3) is engaged with a gear shift control gear set (9) and is rotated by driving the gear shift control gear set (9).
  8. 8. The gear shift controller for load shifting of a transmission according to claim 1, wherein the cam groove is provided with a step-out groove (304) for step-in step-out.
  9. 9. The gear shift controller for load shifting of a transmission according to claim 1, wherein a fork mounting hole (701) for connecting a guide rod (4) is provided on the fork mechanism (7), a slider (702) is provided on the fork mechanism (7), and the slider (702) slides along the cam groove; an annular groove is formed in the middle of the circumferential side of the ratchet wheel (8), two shifting fork arms (703) are arranged on the shifting fork mechanism (7), an annular contact surface matched with the shape of the annular groove is formed between the two shifting fork arms (703), and the two shifting fork arms (703) and the annular contact surface are clamped at the annular groove.

Description

Gear shifting controller for load speed change of gearbox Technical Field The utility model relates to the field of transmission structures, in particular to a gear shifting controller for load shifting of a gearbox. Background In the bicycle and ebike industries, conventional external transmissions have failed to meet market demands. Particularly in ebike markets, the addition of a motor causes a series of problems such as unsmooth gear shifting, chain breakage and the like, and the German pinio gearbox cannot realize speed change under load. In the scheme disclosed at present, there is the condition that certain probability appears beating teeth in the derailleur shift in-process, and current gearbox, for example a gearbox that patent CN116816928B relates to, its fork seat has made the elasticity fork seat that has spring assembly, can control the elastic motion and prevent beating the gear. However, under the condition of load, the elastic shifting fork seat cannot realize the gear withdrawal due to elasticity, and the gear withdrawal can only be realized by unloading the load. That is, when riding, the rider needs to stop pedaling the bicycle before the bicycle can be shifted back. This scheme is very inconvenient, also easily goes out the incident. The electric booster bicycle has the advantages that the gearbox is added with the motor, the torque is applied to the gear under the inertia action of the motor, and the state is even more free from gear withdrawal. Disclosure of utility model In view of the shortcomings in the prior art, it is an object of the present utility model to provide a gear shift controller for load shifting of a transmission. The utility model provides a gear shifting controller for load speed change of a gearbox, which comprises a cam, a guide rod, a shifting fork mechanism and a ratchet wheel, wherein the cam is arranged on the guide rod; The guide rod is provided with a shifting fork mechanism, the cam is provided with a plurality of cam grooves, the cam grooves are circumferentially arranged on the periphery of the cam, one end of the shifting fork mechanism slides along the cam grooves on the cam, and the other end of the shifting fork mechanism is connected with the ratchet wheel and drives the ratchet wheel to move. Preferably, the ratchet comprises a pawl, a wheel disc, a gasket, a pawl mounting groove and a spring; The wheel disc is provided with a pawl mounting groove, and the pawl is axially and slidably mounted in the pawl mounting groove; one side of the pawl mounting groove is provided with a gasket, the gasket is fixedly arranged on the wheel disc, and a spring used for ejecting the pawl out of the end face of the wheel disc is arranged between the gasket and the pawl. Preferably, a limiting boss is arranged on the side face of the pawl, a sinking table is arranged in the pawl mounting groove, and when the pawl is completely hidden in the pawl mounting groove against the elastic force of the spring, the pawl is limited by interference of the limiting boss and the sinking table. Preferably, the tooth surface of the pawl is composed of a tooth inclined surface and a limiting surface. Preferably, the device further comprises a main shaft, a secondary shaft, a main shaft gear and a secondary shaft gear; One or more main shaft gears are arranged on the main shaft, one or more auxiliary shaft gears meshed with the main shaft gears are arranged on the auxiliary shaft, and one or more ratchet wheels are arranged on the main shaft and/or the auxiliary shaft; The guide rod drives a ratchet wheel to move along the axial direction of the main shaft or the auxiliary shaft through a shifting fork mechanism, and the ratchet wheel is allowed to be meshed with a main shaft gear or an auxiliary shaft gear through the pawl. Preferably, the end face of the main shaft gear and/or the auxiliary shaft gear is provided with side teeth which mesh with a ratchet wheel. Preferably, the cam is engaged with the gear shift control gear set and the rotation is effected by driving the gear shift control gear set. Preferably, the cam groove is provided with a gear shift groove for gear shift. Preferably, a shifting fork mounting hole for connecting a guide rod is formed in the shifting fork mechanism, a sliding block is arranged on the shifting fork mechanism, and the sliding block slides along the cam groove; an annular groove is formed in the middle of the circumferential side of the ratchet wheel, two shifting fork arms are arranged on the shifting fork mechanism, an annular contact surface matched with the annular groove in shape is formed between the two shifting fork arms, and the two shifting fork arms and the annular contact surface are clamped at the annular groove. Compared with the prior art, the utility model has the following beneficial effects: 1. According to the application, the ratchet wheel is provided with the pawl which moves unidirectionally, so that upshifting and downshiftin