Variable-speed flywheel

Abstract

The invention discloses a variable-speed flywheel. The variable-speed flywheel comprises a tower wheel, a wheel hub and a freehub, and further comprises a connecting ring and a ring end cap, wherein multiple layers of gear rings of which diameters are increased successively are in lap joint to form the tower wheel; the tower wheel comprises a first gear ring with the maximum diameter and a secondgear ring with the minimum diameter; the tower wheel is in transmission connection with the wheel hub; the inner diameter 2r of the second gear ring is smaller than the outer diameter 2R of the freehub; one end of the freehub is detachably connected with the connecting ring; the ring end cap comprises a column and a cover; the column is connected with the connecting ring; and the cover is in contact with the second gear ring. The variable-speed flywheel has the advantages that the flywheel is universal to a standard freehub, and is low in cost and wide in transmission velocity ratio.

Description

technical field [0001] The invention relates to a bicycle speed change component, in particular to a speed change flywheel. Background technique [0002] With the progress of society, cycling is favored by more and more people. Especially for variable-speed bicycles, the wider the transmission ratio range, the better, so as to adapt to different environments and achieve labor-saving effects. In the prior art, the minimum tooth of the multi-stage variable speed flywheel is 11 teeth. Under certain conditions of the maximum tooth, the range of the speed ratio will increase by about 10% every time the minimum tooth is reduced by one, that is, the smaller the small tooth, the rider will gain Larger gear ratios, however the size of the hub has been standardized, for a universal hub, the outer diameter of the spline part of the hub is 2R, when the number of teeth of the ring gear is less than 11, it will make the root of the smallest tooth of the flywheel The diameter 2r of the c...

AI Technical Summary

Problems solved by technology

In the prior art, the minimum tooth of the multi-stage variable speed flywheel is 11 teeth. Under certain conditions of the maximum tooth, the range of the speed ratio will increase by about 10% every time the minimum tooth is reduced by one, that is, the smaller the small tooth, the rider will gain Larger gear ratios, however the size of the hub has been standardized, for a universal hub, the outer diameter of the spline part of the hub is 2R, when the number of teeth of the ring gear is less than 11, it will make the root of the smallest tooth of the flywheel The diameter 2r of the circle is smaller than 2R, at this time, the size of the hub and the cone wheel interferes and eventually it cannot be assembled

Several brands represented by SRAM have products with 10 teeth in the ring gear, and very few or even the smallest teeth are already 9 teeth. They are all improved by custom hubs, which increases the cost of flywheel components

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