CN2181470Y

CN2181470Y - Internal and external speed gear for bicycle

Info

Publication number: CN2181470Y
Application number: CN 94200531
Authority: CN
Inventors: 何艳
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-01-06
Filing date: 1994-01-06
Publication date: 1994-11-02
Anticipated expiration: 2004-01-06

Abstract

The utility model relates to an internal and external speed gear for bicycles which is used on bicycles, composed of a sprocket gear, a sprocket gear set frame and a sprocket shaft, wherein, the sprocket shaft is formed by five sprocket gears with different sizes and is assembled on the sprocket gear set frame which is installed on the sprocket shaft of an internal speed gear. The utility model has the advantages of simple structure, easy fabrication, easy installation and use, beautiful appearance and large variation range of vehicle speed, and the vehicle speed can cgange from 3-speed AT into 15-speed AT, improving the vehicle speed by 0.7 times.

Description

Internal and external speed gear for bicycle

Change-speed box inside and outside the bicycle that the utility model relates to use on a kind of bicycle.

Bicycle is widely used walking-replacing tool, and is along with the quickening in epoch, also more and more higher to the requirement of bicycle, derailleur, mountain bike are generally ridden usefulness, but mostly variable speed bicycle is to adopt internal speed changer at present, and flywheel is big, velocity variations is also little, and the speed of a motor vehicle does not also satisfy the requirement of riding usefulness person.

The purpose of this utility model provides a kind of inside and outside change-speed box of the bigger bicycle of bicycle shift scope that makes.

The purpose of this utility model is achieved like this, on the basis of the internal speed changer that present bicycle uses, remove sprocket wheel from sprocket shaft, flat 1 weldering of top groove, Che Shangsi is contained on the chain wheel set frame, adorns the chain wheel set that one group of descending 5 different sprocket wheel constitutes with the screw thread form on the chain wheel set frame, make three speed of original internal speed changer, the inside and outside change-speed box of the bicycle of 15 speed that match inside and outside becoming.

The utility model is simple in structure, easily manufactured, be easy to install and use, good looking appearance, speed of a motor vehicle variation range be big, it applies the society and economy remarkable benefit.

Below in conjunction with accompanying drawing structure of the present utility model is elaborated.

Fig. 1 is former bicycle internal speed-changing sprocket shaft constructional drawing.

Fig. 2 is the utility model internal speed-changing chain sprocket structure figure.

Fig. 3 is chain wheel set shelf structure figure.

Fig. 4 is the utility model constructional drawing.

Fig. 5 to Fig. 9 is respectively the constructional drawing of sprocket wheel 4 to 8.

By shown in Figure 4, the utility model is to be made of internal speed-changing sprocket shaft 2, chain wheel set frame 3 and

sprocket wheel

4,5,6,7,8, sprocket wheel uses screw thread form spinning on the chain wheel set frame with size order, chain wheel set frame 3 with the screw thread spinning on internal speed changer sprocket shaft 2, chain wheel set frame internal diameter is same, and it is pluckings that outer neck (directly) is staged one, and one thin,

sprocket wheel

4,5,6 is contained in thick outer neck (directly) portion of chain wheel set frame, and sprocket wheel 7,8 is contained in thin outer neck (directly) portion of chain wheel set frame.

The utility model has changed existing derailleur and has had only three speed, fast speed ratio middling speed is fast 1/3, at a slow speed than the present situation of middling speed slow 1/4, in conjunction with outer change-speed box, thereby make change-speed box enlarge range of use, become 15 speed by three speed, and speed ratio was accelerated 0.7 times originally soon, was example with 11 toothed chain wheels, former racing car speed ratio is 52:14, now bring up to 52:11, improve 1/3 again, so improve 0.7 times of the speed of a motor vehicle altogether through internal speed-changing.

Can be found out by above-mentioned, the utility model has an enormous advantage than existing bicycle speed-varying unit tool, in the title of state-owned bikedom, the cyclist reaches more than 200,000,000 people, therefore the utility model only its China very big application market is just arranged, the develop and spread Huge value is if racing car, the mountain bike used the sportsman are installed and used, must create more excellent achievement, add lustre to for the mankind benefit.

Claims

1, change-speed box inside and outside the bicycle that is made of sprocket wheel and sprocket shaft is characterized in that sprocket wheel (4), sprocket wheel (5), sprocket wheel (6), sprocket wheel (7), sprocket wheel (8) are assemblied in size order that chain wheel set frame (3) is gone up, chain wheel set frame (3) is contained on the internal speed changer sprocket shaft (2).

2, the inside and outside change-speed box of bicycle according to claim 1 is characterized in that all being connected with screw thread between sprocket wheel, chain wheel set frame and the internal speed changer sprocket shaft.

3, the inside and outside change-speed box of bicycle according to claim 1 is characterized in that said sprocket wheel (4), (5), (6) are contained in the same thick external collar of chain wheel set frame (3), and sprocket wheel (7), (8) are contained in the same thin external collar of chain wheel set frame (3).