Foot controlled speed changing device for bicycle
A transmission device and bicycle technology, which is applied to bicycle gear transmission mechanisms, bicycle accessories, vehicle gearboxes, etc., can solve the problems that the transmission ratio cannot be changed too much, the operation is not convenient enough, and the transmission switching ratio is small. Large speed ratio, easy installation and reliable operation
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[0016] Referring to accompanying drawings 2 and 3, the central shaft 1 of the sprocket is a hollow shaft with an axial inner hole, and there is a long radial groove in the middle, and a rectangular key 23 is arranged in the groove, and the rectangular key 23 is exposed from the groove The outer two ends are stuck in the spline teeth of the inner diameter of the left fast gear 6, which drives the left fast gear 6 to rotate synchronously; the end face of the fast gear 6 is connected with the sprocket 3, and the gears 6 and 8 are jointly connected with the driven gear of the coaxial joint structure. The gear 21 meshes, the sprocket center shaft 1 is equipped with ball retaining rings 2, 9 and lock nuts 10, the gears 6, 8 are positioned on the sprocket center shaft 1, and the end face of the left fast gear 6 is bolted to fasten the sprocket 3 and the sprocket backing plate 4 drive the sprocket 3 to rotate, thereby driving the chain and driving the wheel to rotate. The above process...
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