Single-drawing-line slide block type gear shifting device of miniature speed changing box of bicycle

Abstract

The invention discloses a single-drawing-line slide block type gear shifting device of a miniature speed changing box of a bicycle and relates to a middle-axle gear shifting device of the bicycle. The gear shifting device is provided with a middle axle and an auxiliary axle, and shifting forks are arranged on an upper cover of the speed changing box and are a first-gear shifting fork, a second-gear shifting fork, a third-gear shifting fork and a fourth-gear shifting fork respectively. The single-drawing-line slide block type gear shifting device is characterized in that a sliding groove is formed in the upper cover of the speed changing box, a gear shifting slide block is installed in the sliding groove, the front end of the gear shifting slide block is connected with a shifting-up drawing line, the rear end of the gear shifting slide block is connected with a shifting-down drawing line, the other end of the shifting-down drawing line is connected with a shifting-down drawing spring, the gear shifting slide block forwards moves for a distance once a user draws the shifting-up drawing line for one time during shifting-up operation, and the shifting-down drawing spring makes the gear shifting slide block backwards move for a distance through the shifting-down drawing line once the user loosens the shifting-up drawing line for one time during shifting-down operation. The single-drawing-line slide block type gear shifting device of the miniature speed changing box of the bicycle can control gear shifting only by leading out one shifting-up drawing line and greatly facilitates gear shifting operation of a rider.

Description

technical field [0001] The invention relates to a central shaft shifting device of a bicycle, and more particularly relates to a single cable slider type shifting device of a bicycle miniature gearbox. Background technique [0002] Bicycle, also known as bicycle or bicycle. At present, the speed regulation of bicycles mostly adopts the pairing of different teeth on the chain plate on the central shaft and the tooth plate on the rear axle for speed regulation. The transmission speed ratio range is small, and the transmission speed ratio range is generally between 1:1-1:4. between. I have invented some central shaft transmissions for bicycles, such as the title "A Bicycle with a Miniature Box Transmission on the Central Shaft", the patent No. is ZL201010518569.9, and the patent application date is October 25, 2010; type transmission", the patent number is ZL 201010518578.8, and the patent application date is October 25, 2010; the name is "shifting device for bicycle micro-tr...

AI Technical Summary

Problems solved by technology

I have invented some central shaft transmissions for bicycles, such as the title "A Bicycle with a Miniature Box Transmission on the Central Shaft", the patent No. is ZL201010518569.9, and the patent application date is October 25, 2010; type transmission", the patent number is ZL 201010518578.8, and the patent application date is October 25, 2010; the name is "shifting device for bicycle micro-transmission", the patent number is ZL 201010518576.9, and the patent application date is October 25, 2010 , the shifting device is in the form of a vertical shaft cam shifting device; then, on April 15, 2014, I applied for a "slider-type shifting device for a bicycle micro-gearbox", and its patent application number is 2014101500245, Although the slider-type shifting device of the bicycle micro-transmission improves the effect of bicycle shifting, the slider-type shifting device of the bicycle micro-transmission needs two pull wires to control the shifting. When pulling one gear up line, another gear down line needs to be pulled when downshifting, which is inconvenient for the rider to shift gears

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