Adapter gear box in pre-control

Abstract

The invention discloses a pre-control middle connector variable speed case, which relates to a variable speed box, in particular to a gear variable speed box used for a bicycle or a tricycle. The variable speed box comprises a controller and a variable speed case, the controller comprises an operating lever, a protective cover, a vertical tube and a wire clip, and a steel wire in the vertical tube is connected with the wire clip. The variable speed case comprises a case body and a gear in the case body, a cover box is connected with the case body, the wire clip is positioned in the cover box, a shifting fork is installed in the cover box, and the other end of the shifting fork is positioned in the case box. A front axle and a rear axle are installed in the case box, a bull gear and an output gear are respectively connected with both ends of the front axle, a clutch is installed between the bull gear and the output gear, the shifting fork is connected to the clutch, and a reverse gear is installed on the rear axle through a rear roller pin bearing. The variable speed box adopts the key technology that a rotary extrusion ring is installed through a bearing; a supporting tube is connected between the vertical tube and a leather sheath, and the steel wire penetrates into the supporting tube and gets into a conduit tube. The variable speed box has the advantages of good performance, small volume and light weight, and is more suitable for the gear change of the bicycle or the tricycle to be popularized.

Description

(1) Technical field: [0001] The invention relates to a speed change device, in particular to a gear speed change device for bicycles and tricycles. (two) background technology: [0002] At present, the world produces 250 million bicycles every year, of which China accounts for 1 / 3, not including three-wheeled bicycles. Popularizing bicycle speed change is the development direction of Chinese bicycles. However, bicycle speed change is an unsolved technical problem in the global bicycle industry, so the utilization value of bicycles has not been improved. If bicycle speed change is popularized, the value of bicycles will increase by 1 / 3. The inventor obtained the patent No. 96117624.5 on May 22, 2002 for the invention patent of "Bicycle Middle Joint Gearbox". This patented product has made an important contribution to the popularization of bicycle gear shifting, but this patented product also has the following problems that affect The popularity of bicycle gear shifting: ...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the installation of the spinning ring through the collar in the shield and the connection of the support seat between the standpipe and the leather case, the weight of the gearbox is heavy;

[0004] 2. The spinning ring of the second-speed controller is "V"-shaped, which makes the speed change operation not smooth;

[0005] 3. There is only a controller with a handlebar, which cannot meet the various needs of the operation mode

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