CN2390808Y

CN2390808Y - Telescopic crank driving mechanism for bicycle

Info

Publication number: CN2390808Y
Application number: CN 99225236
Authority: CN
Inventors: 崔宝昌
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-08
Filing date: 1999-10-08
Publication date: 2000-08-09
Anticipated expiration: 2009-10-08

Abstract

The utility model discloses a telescopic crank drive mechanism of bicycle fixes the sliding sleeve on the center of sprocket, and the crank is inserted in the sliding sleeve, and the eccentric disc is fixed and is constituted eccentric structure with the chain dish on the frame, and the dish edge of eccentric disc is equipped with the planet gyro wheel, crank and planet gyro wheel coupling, and the pedal plate coupling is at articulate front end. When the pedal plate moves, the crank can only rotate along the circumferential track of the eccentric disc, and reciprocates in the sliding sleeve, at the moment, the length of the pedal plate and the chain wheel (middle shaft) continuously changes along with the crank, namely the moment continuously changes, so that under the same force action, the acting is increased, or under the same acting condition, the force is reduced, and the aim of saving labor when riding the bicycle is achieved.

Description

Bicycle Telescopic Crank Transmission Mechanism

本实用新型涉及自行车传动机构的改进，进一步说是公开了一种自行车伸缩式曲柄传动机构，属于机械传动技术领域。The utility model relates to the improvement of a bicycle transmission mechanism, and further discloses a bicycle telescopic crank transmission mechanism, which belongs to the technical field of mechanical transmission.

常规的自行车传动机构是通过曲柄直接将力传动给链盘，驱动自行车运动，由于曲柄的长度对于链盘是固定不变的，即力距不变，所以人用同样的力所做的功是一样的，用同样的力无法进一步加快自行车的速度。The conventional bicycle transmission mechanism directly transmits force to the chain plate through the crank to drive the bicycle to move. Since the length of the crank is fixed to the chain plate, that is, the force distance is constant, the work done by the same force is All the same, the bike cannot be accelerated any further with the same amount of force.

本实用新型的目的旨在提供一种自行车伸缩式曲柄传动机构，用与常规自行车同样的驱动力进一步提高自行车的速度。The purpose of this utility model is to provide a telescopic crank transmission mechanism for a bicycle, which can further increase the speed of the bicycle with the same driving force as that of a conventional bicycle.

本实用新型的目的是这样实现的：在自行车的中轴上设有链轮，滑套固定在链轮的中部，曲柄插在滑套中，偏心盘固定在车架上与自行车中轴构成偏心结构，偏心盘的盘缘设有行星滚轮，曲柄与行星滚轮轴接，脚蹬板轴接在曲柄的前端；当脚蹬板做圆周运动时，带动曲柄及行星滚轮沿偏心盘的圆周轨迹运动，同时，曲柄在滑套中往复滑动，并驱使链轮绕中轴转动，带动自行车运动。The purpose of this utility model is achieved in this way: a sprocket is arranged on the central shaft of the bicycle, the sliding sleeve is fixed in the middle of the sprocket, the crank is inserted in the sliding sleeve, and the eccentric disc is fixed on the frame to form an eccentric with the bicycle central shaft. The structure, the rim of the eccentric disc is equipped with a planetary roller, the crank is connected to the shaft of the planetary roller, and the shaft of the pedal board is connected to the front end of the crank; when the pedal board makes a circular motion, it drives the crank and the planetary roller to move along the circular track of the eccentric disc , at the same time, the crank reciprocally slides in the sliding sleeve, and drives the sprocket to rotate around the central axis to drive the bicycle to move.

本实用新型的积极效果在于：采用偏心链盘结构，脚蹬板运动时只能沿偏心盘圆周轨迹转动，使曲柄在滑套中往复运动，脚蹬板与链轮(中轴)的长度随曲柄而不断变化，即力距不断变化，从而在同样的力作用下，做功增加，或做同样的功条件下，用力减小，即达到骑自行车省力的目的。The positive effect of the utility model is that: adopting the eccentric chain plate structure, the pedal plate can only rotate along the circular track of the eccentric plate when it moves, so that the crank reciprocates in the sliding sleeve, and the length of the pedal plate and the sprocket (central axis) changes with the The crank is constantly changing, that is, the force distance is constantly changing, so that under the same force, the work is increased, or under the same work condition, the force is reduced, that is, the purpose of saving effort when riding a bicycle is achieved.

图1为本实用新型结构原理图。Fig. 1 is a structural schematic diagram of the utility model.

下面结合附图进一步说明本实用新型：Further illustrate the utility model below in conjunction with accompanying drawing:

在图1中，链盘5固定在自行车的中轴8上，通过链条7与后轮连接，滑套6为三个滚轮呈三角形结构连接，并固定在链盘5的中心，曲柄3插在滑套6中，偏心盘4固定在自行车架上，与链轮5(中轴)中心为偏心结构布置，偏心盘4的盘缘为沟槽结构，行星轮2镶嵌在其中，曲柄3的另一端分别与行星轮2及脚蹬板1轴接，带动行星轮2沿偏心轮4做圆周运动；在实施过程中，偏心盘与中轴的偏心距为75毫米。In Fig. 1, the chain disc 5 is fixed on the central shaft 8 of the bicycle, connected with the rear wheel through the chain 7, the sliding sleeve 6 is connected in a triangular structure for three rollers, and is fixed at the center of the chain disc 5, and the crank 3 is inserted in the In the sliding sleeve 6, the eccentric disc 4 is fixed on the bicycle frame, and is arranged in an eccentric structure with the center of the sprocket 5 (middle shaft). One end is respectively connected with the planetary wheel 2 and the pedal plate 1, and drives the planetary wheel 2 to make a circular motion along the eccentric wheel 4; in the implementation process, the eccentric distance between the eccentric disc and the central shaft is 75 mm.

Claims

1. A bicycle telescopic crank transmission mechanism is to fix the chain disc (5) on the central axis of the bicycle and connect it with the rear wheel through the chain (7). It is characterized in that the sliding sleeve (6) is fixed on the sprocket ( 5), the crank (3) is inserted into the sliding sleeve (6), the eccentric disc (4) is fixed on the frame and forms an eccentric structure with the chain disc (5), and the rim of the eccentric disc (4) is provided with planetary rollers (2), the crank (3) is pivotally connected to the planetary roller (2), and the pedal plate (1) is pivotally connected to the front end of the crank (3).

2. The bicycle telescopic crank transmission mechanism according to claim 1, characterized in that the above-mentioned sliding sleeve (6) is connected by three rollers in a triangular structure, and is fixed at the center of the chain disc (5).