Novel linear speed change device for bicycle

Abstract

The invention provides a novel linear speed change device for a bicycle. The novel linear speed change device comprises a driving shaft, a sun gear, a planet gear, a friction ring, a friction piece, a prepressing spring, a friction piece separator, a friction piece supporting frame, a fixing pin of the friction piece supporting frame and a gear ring, wherein the sun gear is installed on the driving shaft; the planet gear is arranged between the gear ring and the sun gear and meshed with internal teeth of the sun gear and internal teeth of the gear ring, and the planet gear is installed on the friction ring through a planet axle; the friction piece is installed in the friction ring and composed of an upper friction piece body and a lower friction piece body, the prepressing spring is arranged in the middle of the friction piece, and a square notch and a round notch are formed in the two ends respectively; the fixing pin, in a round shaft shape, of the friction piece supporting frame is installed at one end of the friction piece supporting frame, the friction piece separator in a square block shape is installed at the other end, the round-shaft-shaped end of the fixing pin of the friction piece supporting frame is installed in the round notch of the friction piece, and the other end of the fixing pin of the friction piece supporting frame is installed on a bicycle frame, and the square-block end of the friction piece separator stretches into the square notch of the friction piece. The novel linear speed change device can perform linear speed change and real-time speed change, and speed change is stable.

Description

technical field [0001] The invention relates to a speed change device of a vehicle, in particular to a linear speed change device for a bicycle. Background technique [0002] Bicycles have the characteristics of no noise, no pollution, light weight, small size, and easy placement. They can be used not only as a means of transportation and carrying light goods, but also for physical exercise. They are one of the most frequently used means of transportation in people's daily life. one. Since 1902, Britain's Stormy-Archer company installed a speed changer on the rear wheel of the bicycle, and the variable speed bicycle appeared. The variable-speed bicycle has a set of gears of different specifications in the rear wheel hub of the bicycle. When the bicycle is moving, the chain can be placed on different gears through the gearshift, thereby changing the speed of the bicycle to adapt to different road conditions and the physical strength of the rider. At present, most of the spe...

AI Technical Summary

Problems solved by technology

At present, most of the speed-changing bicycles still use a similar method, except that there are multi-stage tower wheels in the front and rear of the chain, and the number of shifting stages increases, but it does not change the shifting principle in essence. The disadvantage is that the chain is shifted to different gears in the front and rear. It is not in a straight line, it is easy to wear and tear, it is easy to take off the chain, it cannot change linearly and continuously, and it needs to change the speed in advance when going uphill, and it cannot change the speed immediately to adapt to the changing road conditions.

In some new related inventions, there are bicycles that use the principle of planetary reduction mechanism to change speed, such as the patent application number CN201220301324.5, which uses the speed change steel wire to pull the ring gear to move axially, and meshes with planetary gear sets of different sizes to achieve speed change , there is a fast gear, a slow gear and a neutral gear. Although the chain moves in a straight line, it cannot change linearly and continuously, and the gear shift needs a suitable timing, otherwise the ring gear and the planetary gear teeth are easily stuck due to misalignment. Hold, can't change speed instantly

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