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Bicycle transmission mechanism provided with speed increasing front chain wheel

A technology of transmission mechanism and front sprocket, applied in chain/belt transmission, vehicle parts, vehicle gearbox, etc., can solve problems such as increased unevenness of motion, and achieve the effect of increasing the maximum transmission ratio

Active Publication Date: 2019-12-17
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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  • Bicycle transmission mechanism provided with speed increasing front chain wheel
  • Bicycle transmission mechanism provided with speed increasing front chain wheel
  • Bicycle transmission mechanism provided with speed increasing front chain wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] refer to Figure 1-Figure 9 , the present invention has a bicycle transmission mechanism with a speed-increasing front sprocket, including a front sprocket, a rear sprocket 8 and a chain 7, and the chain is meshed and connected between the front sprocket and the rear sprocket, and is characterized in that : the front sprocket includes a coaxially distributed driven sprocket 1, a drive disc 3 and a fixed gear 2, and a planetary gear 4 that is rotatably connected to the drive disc, and the fixed gear is axially located at the between the driven sprocket and the driving disc; the driven sprocket includes a first wheel 101, an inner ring gear 102 located on one side of the first wheel and a first wheel located on the edge of the wheel and distributed along the circumference. Gear teeth 103, inner gear teeth 105 are arranged on the inner peripheral surface of the inner ring gear, and a first through hole 104 is also arranged in the center of the first wheel disc; the fixed g...

Embodiment 2

[0028] On the basis of the first embodiment, there are multiple planetary gears, and each of the planetary gears is distributed along the axis of the drive plate at an equal angle on the circumference, so as to improve the transmission stability of the front sprocket.

Embodiment 3

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

[0031] The present invention drives the drive plate to rotate synchronously through the pedal connecting rod, and the drive plate drives the planetary gear to make a circular motion. Since the planetary gear is meshed with the fixed and immovable second gear teeth on the fixed gear, and the planetary gear is also connected with the driven sprocket. The inner gear teeth of the front sprocket are meshed and connected, so the speed ratio of the driving disc and the driven sprocket can be calculated by the formula, and the calculation process is as follows:

[0032] Let: n 1 is the rotational speed of the driven sprocket, n 2 is the rotational speed of the fixed gear (the rotational speed is 0), n 3 is the rotational speed of the drive disc (that is, the rotational speed of the pedal connecting rod), n 4 is the rotational speed of the...

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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 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 transmission is the main form of bicycle transmission mechanism, which has the advantages of light structure, easy maintenance, stable transmission, and small impact and vibration. With the development of bicycle chain transmission technology, the application advantages of variable speed chain transmission bicycles in complex terrain occasions have been generally recognized. For example, mountain bikes and road bicycles all use sprocket combinations with different transmission ratios to meet different applications. [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 ...

Claims

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Application Information

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Patent Type & Authority Applications(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