Multi-gear transmission and center wheel pawl installation structure used in same

Abstract

The invention discloses a multi-gear transmission and a center wheel pawl installation structure used in the same. A gear control assembly of the transmission comprises an operation device and a plurality of execution devices. The operation device comprises a sawtooth component arranged at the end of an output wheel hub rotationally, the sawtooth component drives a plurality of pawl rods, and the pawl rods are rotationally embedded in grooves formed in the axial direction of a main shaft; one ends of the pawl rods make contact with the sawtooth component, the pawl rods are controlled through the sawtooth component to rotate, a pawl of a corresponding center wheel connected with the other end of each pawl rod is operated to swing, and then the corresponding center wheels are controlled to be engaged and disengaged with the main shaft through the pawls. The pawl rods are subjected to gear shifting by rotating and shifting the pawls, and are small in abrasion and high in response speed. For the center wheels with a small size, the pawls are installed by arranging lengthening sleeves, the diameter of an inner gear ring can be reduced, the size of the inner transmission can be further effectively reduced, and light-weight design of the transmission is facilitated.

Description

technical field [0001] The invention belongs to the technical field of transmissions, and in particular relates to a multi-speed transmission and a center wheel ratchet installation structure applied thereto. Background technique [0002] The gear control mechanism of the bicycle's internal transmission is to achieve different transmission speed ratios by controlling the engagement or separation of the sun gear or the planet carrier or the ring gear in the planetary gear mechanism. The clutch mechanism applied to the bicycle internal transmission is usually a pawl Type overrunning clutch, the traditional internal transmission separately controls the ratchet action of the clutch between the gears of the planetary gear mechanism to achieve gear shifting. Therefore, in the process of controlling gear shifting, it is necessary to set up multiple operating mechanisms, which is complicated to operate and takes up a lot of space. [0003] The Chinese patent document with the applic...

AI Technical Summary

Problems solved by technology

[0002] The gear control mechanism of the bicycle's internal transmission is to achieve different transmission speed ratios by controlling the engagement or separation of the sun gear or the planet carrier or the ring gear in the planetary gear mechanism. The clutch mechanism applied to the bicycle internal transmission is usually a pawl Type overrunning clutch, the traditional internal transmission separately controls the ratchet action of the clutch between the gears of the planetary gear mechanism to achieve gear shifting. Therefore, in the process of controlling gear shifting, it is necessary to set up multiple operating mechanisms, which is complicated to operate and takes up a lot of space.

[0003] The Chinese patent document with the application number 201310585100.0 discloses a bicycle internal transmission, the gear shift actuator adopts the axial shaft control pawl lever and the central control pawl lever, and realizes the action of the clutch pawl by axial linear sliding , the friction resistance of linear sliding is large, and it is easy to wear

In addition, this solution needs to control the clutch of the planetary carrier through the clutch, which is complicated to control and takes up a lot of space, increasing the size and weight of the transmission

[0004] At the same time, since the internal transmission is driven by a planetary gear system, when designing the transmission ratio, since the center wheel needs to be set on the main shaft, under the condition of ensuring the strength of the main shaft and assembly conditions, it is necessary to select a center wheel with a large number of teeth to ensure that the center wheel If there is space to set up the pawl clutch mechanism, the inner ring gear and the planetary carrier need to be relatively enlarged, resulting in the inability to further reduce the shell size of the inner transmission, which is not conducive to the realization of lightweight bicycle transmission structure

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