Foot controlled speed changing device for bicycle

Abstract

The invention relates to a pedal-controlled speed change device for a bicycle. The middle shaft of the sprocket (1) is provided with an axial inner hole and a radially through long groove, and a left-end fast gear (6) and a right-end slow gear (8) are coaxially installed. And speed change sleeve (12), left end fast gear (6), right end slow gear (8) are provided with inner diameter spline teeth, sprocket wheel (3) is connected with the end face of left end fast gear (6), sprocket wheel axis ( 1) The driven gear (21) with a coaxial conjoined structure is installed at the bottom, and its tooth surface meshes with the fast gear (6) at the left end and the slow gear (8) at the right end respectively. An energy storage spring (24) and a variable speed moving connecting rod (19) are arranged in the hole, a rectangular key (23) is installed on one end of the variable speed moving connecting rod (19) and is adjacent to the energy storing spring (24), and the other end is provided with a variable speed connecting rod (19). Connecting rod cross bar (11), its two ends ride on the annular slope (27) of high and low point of speed change sleeve (12) axial symmetry. The invention belongs to foot-operated counter-rotating speed change, which has the characteristics of large speed ratio, fast speed change, reliable operation without chain loss, no need for manual speed change cable accessories, and easy installation.

Description

technical field [0001] The invention relates to a bicycle speed change device, specifically a bicycle pedal-controlled speed change device. Background technique [0002] The majority of existing bicycle transmissions are driven by chains, and the purpose of changing the transmission speed ratio is achieved by adjusting the diameter of the driving sprocket (middle shaft) and the driven sprocket (rear wheel). The current popular chain drive speed change device has the following defects: the speed change ratio cannot be changed too much, although some speed change devices have as many as ten or more gears, but to change from the fastest to the slowest speed, you must go through a multi-stage sprocket. The speed change can only be realized through step-by-step transition, and the speed ratio of the speed change is small; the chain and the sprocket are frequently switched during the speed change process, and the fault of the chain detaching from the sprocket is prone to occur; th...

AI Technical Summary

Problems solved by technology

The current popular chain drive speed change device has the following defects: the speed change ratio cannot be changed too much, although some speed change devices have as many as ten or more gears, but to change from the fastest to the slowest speed, you must go through a multi-stage sprocket. The speed change can only be realized through step-by-step transition, and the speed ratio of the speed change is small; the chain and the sprocket are frequently switched during the speed change process, and the fault of the chain detaching from the sprocket is prone to occur; the speed change is manually operated, and accessories such as a speed change cable need to be installed, and the operation is not enough. convenient

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