Foot controlled speed changing device for bicycle

A transmission device and bicycle technology, which is applied to bicycle gear transmission mechanisms, bicycle accessories, vehicle gearboxes, etc., can solve the problems that the transmission ratio cannot be changed too much, the operation is not convenient enough, and the transmission switching ratio is small. Large speed ratio, easy installation and reliable operation

Inactive Publication Date: 2005-03-23
罗明端
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current popular chain drive speed change device has the following defects: the speed change ratio cannot be changed too much, although some speed change devices have as many as ten or more gears, but to change from the fastest to the slowest speed, you must go through a multi-stage sprocket. The speed change can only be realized through step-by-step transition, and the speed ratio of the speed change is small; the chain and the sprocket are frequently switched during the speed change process, and the fault of the chain detaching from the sprocket is prone to occur; the speed change is manually operated, and accessories such as a speed change cable need to be installed, and the operation is not enough. convenient

Method used

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  • Foot controlled speed changing device for bicycle
  • Foot controlled speed changing device for bicycle
  • Foot controlled speed changing device for bicycle

Examples

Experimental program
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Embodiment Construction

[0016] Referring to accompanying drawings 2 and 3, the central shaft 1 of the sprocket is a hollow shaft with an axial inner hole, and there is a long radial groove in the middle, and a rectangular key 23 is arranged in the groove, and the rectangular key 23 is exposed from the groove The outer two ends are stuck in the spline teeth of the inner diameter of the left fast gear 6, which drives the left fast gear 6 to rotate synchronously; the end face of the fast gear 6 is connected with the sprocket 3, and the gears 6 and 8 are jointly connected with the driven gear of the coaxial joint structure. The gear 21 meshes, the sprocket center shaft 1 is equipped with ball retaining rings 2, 9 and lock nuts 10, the gears 6, 8 are positioned on the sprocket center shaft 1, and the end face of the left fast gear 6 is bolted to fasten the sprocket 3 and the sprocket backing plate 4 drive the sprocket 3 to rotate, thereby driving the chain and driving the wheel to rotate. The above process...

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PUM

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Abstract

A foot-controlled gear of bicycle is coaxially installed on the chain wheel axle. It consists of a quick gear, a slow gear, and a switching sleeve. The quick gear and slow gear is equipped with inner spline. The chain wheel is engaged with the quick gear at end surfaces. A servo-gear is installed below the chain wheel to engaged with the quick gear and the slow gear. An energy-storing spring and a gear-linking bar are used for the mechanism to change speed by pedaling in an opposite direction of rotation. The gear omits a gear cable, works reliably, changes speed easily, and is installed simply.

Description

technical field [0001] The invention relates to a bicycle speed change device, specifically a bicycle pedal-controlled speed change device. Background technique [0002] The majority of existing bicycle transmissions are driven by chains, and the purpose of changing the transmission speed ratio is achieved by adjusting the diameter of the driving sprocket (middle shaft) and the driven sprocket (rear wheel). The current popular chain drive speed change device has the following defects: the speed change ratio cannot be changed too much, although some speed change devices have as many as ten or more gears, but to change from the fastest to the slowest speed, you must go through a multi-stage sprocket. The speed change can only be realized through step-by-step transition, and the speed ratio of the speed change is small; the chain and the sprocket are frequently switched during the speed change process, and the fault of the chain detaching from the sprocket is prone to occur; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62M11/04B62M25/06
Inventor 罗明端
Owner 罗明端
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