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A bicycle transmission mechanism with speed-increasing front sprocket

A transmission mechanism and front sprocket technology, which is applied to chain/belt transmission devices, vehicle components, vehicle gearboxes, etc., can solve problems such as increased unevenness of motion, and achieve the effect of increasing the maximum transmission ratio

Active Publication Date: 2021-01-01
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently on the market, in order to increase the maximum transmission ratio, it is usually a technology to make the diameter of the smallest sprocket in the rear sprocket as small as possible, or to make the diameter of the largest sprocket in the front sprocket as large as possible. Because the height of the pedal transmission shaft from the ground cannot be too high, and when the diameter of the sprocket is small, the unevenness of the movement will be aggravated if the number of teeth is too small. Therefore, under the condition of fixed dimensions, The maximum transmission ratio of a bicycle is limited, and now it is necessary to conduct more in-depth research on the bicycle chain drive to seek a new breakthrough in the maximum transmission ratio

Method used

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  • A bicycle transmission mechanism with speed-increasing front sprocket
  • A bicycle transmission mechanism with speed-increasing front sprocket
  • A bicycle transmission mechanism with speed-increasing front sprocket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Refer toFigure 1-Figure 9, The present invention is a bicycle transmission mechanism with a speed-increasing front sprocket, comprising a front sprocket, a rear sprocket 8 and a chain 7, the chain is meshingly connected between the front sprocket and the rear sprocket, and is characterized in : The front sprocket includes a coaxially distributed driven sprocket 1, a driving disc 3 and a fixed gear 2, and a planetary gear 4 rotatably connected with the driving disc. The fixed gear is located in the axial direction. Between the passive sprocket and the drive disc; the passive sprocket includes a first sprocket 101, an inner gear 102 located on one end surface of the first sprocket, and first sprockets located on the edge of the sprocket and distributed along the circumference. Gear teeth 103, inner gear teeth 105 are arranged on the inner circumferential surface of the inner gear ring, and a first through hole 104 is arranged in the center of the first wheel disc; the fixed gear...

Embodiment 2

[0028]On the basis of the first embodiment, the planetary gears have a plurality of planetary gears, and each of the planetary gears is circumferentially equiangularly distributed along the axis of the drive disc to improve the transmission stability of the front sprocket.

Embodiment 3

[0030]On the basis of the first embodiment, a bearing is also provided between the first through hole and the first rotating support shaft.

[0031]The present invention drives the drive plate to rotate synchronously through the pedal link, and the drive plate drives the planetary gears to make circular motions. Because the planetary gears are in meshing connection with the fixed second gear teeth on the fixed gears, and the planetary gears are also connected to the passive sprocket The teeth of the inner gear are meshed and connected, so in the front sprocket, the speed ratio of the drive disc and the passive sprocket can be calculated by the formula. The calculation process is as follows:

[0032]Let: n1Is the speed of the passive sprocket, n2Is the speed of the fixed gear (speed is 0), n3Is the speed of the drive disc (that is, the speed of the pedal connecting rod), n4Is the rotation speed of the planetary gear, Z1Is the number of teeth of the internal gear of the passive sprocket, Z2...

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Abstract

The invention discloses a bicycle transmission mechanism provided with a speed increasing front chain wheel. The bicycle transmission mechanism comprises a driven chain wheel, a drive disc, a planetary gear, and a fixed gear connected with the drive disc in a rotating manner, wherein the driven chain wheel, the drive disc and the planetary gear are distributed coaxially. The fixed gear is locatedbetween the driven chain wheel and the drive disc. According to the bicycle transmission mechanism, when a pedal plate rotates by one cycle, the front chain wheel of a bicycle can complete rotation more than one cycle, the speed increasing effect of the front chain wheel is achieved, and thus the maximum transmission ratio of the bicycle transmission mechanism is increased.

Description

【Technical Field】[0001]The present invention relates to the technical field of bicycle transmission mechanisms, in particular to a bicycle transmission mechanism with a speed-increasing front sprocket.【Background technique】[0002]Chain drive is the main form of bicycle drive mechanism. It has the advantages of light structure, easy maintenance, stable transmission, and low impact and vibration. With the development of bicycle chain drive technology, the application advantages of variable speed chain drive bicycles in complex terrain situations have been generally recognized. For example, mountain bikes and road bikes all use sprocket combinations with different transmission ratios to meet different applications.[0003]In order to increase the maximum transmission ratio of the variable speed bicycles on the market, the diameter of the smallest sprocket in the rear sprocket is usually made as small as possible, or the diameter of the largest sprocket in the front sprocket is made as lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62M9/10
CPCB62M9/105
Inventor 徐爱群詹诗盛顾前行
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY