Clutch mechanism of bicycle speed changing system and speed changing box

Abstract

The invention relates to a clutch mechanism of a bicycle speed changing system and a speed changing box. The clutch mechanism comprises a clutch shaft, clutch gears and cams. The cams are arranged in the clutch shaft in a relative rotation manner; the clutch gears are arranged on the clutch shaft; the clutch mechanism further comprises trigger claws; during gear shifting, the cams are driven by external force to rotate, the head ends of the trigger claws slide towards a base circle along the large circle profiles of the cams, and when the head ends of the trigger claws reach the base circle, the clutch gears make contact with the tail ends of the multiple trigger claws, so that the clutch gears and the clutch shaft move together; a clutch can bear the pedaling torque of a large-weight driver, the clutch action is smoother, gear shifting is easier, the "excessive" constraint of a traditional clutch on the size is eliminated, the defects of a traditional small-size clutch are overcome, any obvious performance defect cannot be generated accordingly, and reliability is high; and the cams are simple in structural design, low in process requirement and low in manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of clutches, in particular to a clutch mechanism and a gearbox of a bicycle transmission system. Background technique [0002] The gearbox of a multi-speed bicycle allows bicycle users to choose the appropriate transmission ratio according to physical strength and road conditions, and then helps the human body maintain the cadence corresponding to the maximum power output, which is especially important for competitions. The clutch is usually the core component of the gearbox. The criteria for evaluating its design level usually include: reliability, shift efficiency (especially when the user is pedaling), design complexity, manufacturing cost, manufacturability, certain Some clutches also take into account the amount of idle travel between gears, especially when torque is to be transmitted immediately after a gear change, such as going up a steep hill. [0003] The rotary gearbox clutch is a mechanism that ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing rotary transmission clutch has disadvantages such as low reliability, low shifting efficiency when stepping on it, complex design, poor manufacturability, high manufacturing cost, and large stepping neutral between shifting gears. For the above-mentioned defects of the prior art, a clutch mechanism and a gearbox of a bicycle transmission system are provided

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