Automatic bicycle speed variator

Abstract

The automatic bicycle speed variator mounted on the shaft has power input chain wheel, speed varying output hub, speed variator and speed variation controller inside the hub casing. The speed variator includes three planetary gear trains with separated speed varying ratchet wheel and three ratchets separately fitting these three ratchet wheels inside the hub casing. The speed variation controller includes one second and one third centrifugal block balancing discs with hinged centrifugal block each, and the each of the centrifugal blocks has axial ratchet shifting rod connected to the ratchet. In the automatic bicycle speed variator, the ratchets and the ratchet wheels for the medium speed and high speed are controlled with the centrifugal blocks of different masses, so that the present invention has flexible speed variation and easy speed variation control.

Description

technical field [0001] The invention relates to a solid-shaft automatic transmission for bicycles, in particular to a speed change device and a speed-change control device for the solid shaft automatic transmission for bicycles. Background technique [0002] In the prior art, Chinese patent ZL 2004 2 0070090.3 discloses a solid-shaft automatic transmission for bicycles. The casing has a power input sprocket on the axle at one end of the casing, and a transmission output hub at the other end of the casing. There is a transmission device and a transmission control device inside the casing. The transmission device is a set of planetary gears coaxial with the axle. There is a ratchet pawl transmission device between the planetary gear system and the hub, and there are three speed gears of low, medium and high between the planetary gear system and the power input sprocket due to the different input parts to the planetary gear system; the speed change control device There is a ce...

AI Technical Summary

Problems solved by technology

[0004] 1. The variable speed control is realized by changing the three speed gears of the cross wheel in the axial direction through a series of axial transmission devices. The axial transmission resistance is relatively large, which makes the variable speed control inflexible;

[0005] 2. The speed change device has a planetary gear train, and the speed change is realized by changing the input position. In the low, medium and high speed gears, the gear cross wheel is the driving element of the transmission, and the gear cross wheel and the transmission element of the planetary gear train There is a large binding force between them. During the speed change control, it is necessary to release this binding force to realize the shifting and shifting along the axial direction. Therefore, when changing the speed, the cyclist must estimate that the speed reaches the speed change requirement, and pedal slowly. Only by pedaling once to release the transmission combination force between the gear cross wheel and the gear can automatic shifting and shifting be realized, which makes it difficult to control the speed change

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