CN2640912Y

CN2640912Y - Forward and reverse single chain two speed bicycle

Info

Publication number: CN2640912Y
Application number: CN 03213904
Authority: CN
Inventors: 孟晓峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-03
Filing date: 2003-07-03
Publication date: 2004-09-15
Anticipated expiration: 2013-07-03

Abstract

The utility model relates to a forward and reverse single chain two speed bicycle, comprising a bicycle frame, a drive big chain wheel, a rear axis, fly wheels and a chain. The utility model is characterized in that the rear axis is provided with a big fly wheel and a mall wheel; the bicycle frame is provided with an inverted wheel; the chain which meshes on big chain wheel meshes on the big fly wheel and the small fly wheel along the same direction; after meshing with the big fly wheel and the small fly wheel, the chain is arranged on the inverted wheel. The utility model has the advantages that pedaling forwards or backwards both can drive the bicycle to advance without making the riding tired; in the meantime, pedaling forwards is fast riding and pedaling backwards is slow riding. The utility model realizes two stage speed change with the advantages of simple structure, little fault, and low manufacturing cost.

Description

Forward and reverse strand bar two fast bicycles

Technical field

The utility model belongs to a kind of bicycle, particularly a kind of forward and reverse strand bar two fast bicycles.

Background technology

The present variable speed bicycle that generally uses, its drive configuration mainly include two-stage and drive hinge wheel, multistage gear shift flywheel and change-speed box etc., and complex structure, productive costs height break down again easily.Simultaneously existing bicycle has only to scrunch forward and could drive bicycle forward, as the distance far away of riding only keeps same riding posture will increase sense of fatigue.

The utility model content

The purpose of this utility model provides a kind of forward and reverse strand bar two fast bicycles, can realize the twin-stage speed change, and is simple in structure, is not easy to break down, and productive costs is lower, simultaneously, scrunches forward or backward and can both drive bicycle forward, rides to be difficult for producing sense of fatigue.

The purpose of this utility model is achieved by the following technical solution: it comprises bicycle rack, drives hinge wheel, rear axle, flywheel and chain etc., it is characterized in that: a big flywheel of assembling and a small flywheel on rear axle, assembling falls to take turns on vehicle frame, be engaged on equidirectional the installing around of chain that drives on the hinge wheel and be engaged on big flywheel and the small flywheel, install around chain after the engagement from big flywheel and small flywheel and be sleeved on down and take turns.

The utility model has the advantages that: scrunch forward or backward and can both drive bicycle forward, riding is difficult for producing sense of fatigue, simultaneously, scrunch forward and be fast running, scrunch backward, realize the twin-stage speed change to travelling at a slow speed, simple in structure, be not easy to break down, productive costs is lower.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is that chain installs around at the scheme drawing that drives on hinge wheel, big flywheel and the small flywheel.

Fig. 3 is big flywheel and small flywheel assembling scheme drawing.

The specific embodiment

See Fig. 1-3, concrete structure is as follows: assemble big flywheel 3 and small flywheel 4 by existing flywheel structure on rear axle 7, small flywheel 4 is positioned at the inboard of big flywheel 3, and what one of fixing assembling can be rotated on the cross sill 6 of bicycle rack takes turns 5.Article one, chain 2 connects into closed loop chain by joint 8, the method that installs around of chain 2: from being positioned at the joint 8 of below, walk around anterior driving hinge wheel 1 earlier, walk around small flywheel 4 then from the top, walk around and take turns 5, walk around big flywheel 3 at last and get back to joint 8.

The utility model is applicable to various bicycles and three-wheel vehicle.

Claims

1, a kind of forward and reverse strand bar two fast bicycles, it comprises bicycle rack, drives hinge wheel, rear axle, flywheel and chain etc., it is characterized in that: a big flywheel of assembling and a small flywheel on rear axle, assembling falls to take turns on vehicle frame, be engaged on equidirectional the installing around of chain that drives on the hinge wheel and be engaged on big flywheel and the small flywheel, install around chain after the engagement from big flywheel and small flywheel and be sleeved on down and take turns.