Overdrive system for four-wheel bicycle

Abstract

The invention provides an overdrive system for a four-wheel bicycle, comprising a drive lever, one side end is hinged with a wheel bracket, the other side end is provided with a pedal, a rack is arranged downwards at middle part and elasticially supported by a spring of the wheel bracket; a frist pinion, connected with a first shaft, is single-way ratchet wheel and engaged with the rack; a first chain wheel, connected with the first shaft; a second pinion, connected with a second shaft and connected with the chain wheel by a chain; a second chain wheel, connected with the second shaft; a third pinion,, connected with a third shaft and connected with the chain wheel by the chain; a fourth pinion, connected with a fourth shaft; connected with the third chain wheel by the chain. Using the overdrive system for the four-wheel bicycle, the four-wheel bicycle can load more goods and people with low cost and users can ride the bicycle with little power.

Description

technical field [0001] The present invention relates to a speed-up device for a four-wheeled bicycle, in particular to a speed-up device that combines a plurality of sprockets and ratchet wheels to generate speed-up. The pedals that drive the levers allow the quad bike to be ridden with less effort. Background technique [0002] The applicant of the present invention has previously applied for the patent No. 656811 "speed-up device for taxi-type bicycle", and the "speed-up device for taxi-type bicycle" is as figure 1 As shown, multiple sprockets and ratchets are included. [0003] The action of the speed-up device is as follows: figure 1 As shown, if the user steps on the forward pedal 51 of the forward lever 50, the ratchet 29 connected to the end of the forward lever 50 rotates the shaft 41, and the first ratchet 21 connected with the ratchet 29 through the first chain 31 Rotate, the second large sprocket 12 to the fifth ratchet 25 rotate in conjunction, so that the rea...

AI Technical Summary

Problems solved by technology

[0004] But, because the distance between the forward pedal 51 of the forward lever 50 and the ratchet 29 is too long in the speed increasing device constituted as above, when the user steps on the forward pedal 51, the rotational displacement of the ratchet 29 is too small, and there is a problem that the speed of the bicycle is not fast enough.

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