CN2227075Y

CN2227075Y - Shift chain wheel adding device for bicycle

Info

Publication number: CN2227075Y
Application number: CN95207258U
Authority: CN
Inventors: 王国新; 叶锐成
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-06
Filing date: 1995-04-06
Publication date: 1996-05-15
Anticipated expiration: 2005-04-06

Abstract

The utility model relates to a shift chain wheel adding device for a bicycle, comprising chain wheels which are in a circular pipe shape. One end of each chain wheel is provided with convex teeth, and each chain wheel is sheathed with each other through screw threads arranged on the circular pipe wall. The utility model has the advantage that the number of the convex teeth of the chain wheels can be arbitrarily changed to control freely the speed of bicycles.

Description

The bicycle shift sprocket wheel increases device

The utility model relates to a kind of speed-change and gearshift of bicycle device, and particularly a kind of bicycle shift sprocket wheel increases device.

In the prior art, because the bicycle shift speed change is subjected to the restriction of sprocket wheel pipe diameter, so that can not indiscriminately ad. as one wishes control the speed of bicycle.

The purpose of this utility model is to provide a kind of can increase car stop number voluntarily, thereby the bicycle shift sprocket wheel of controlling bicycle speed more freely increases device.

The purpose of this utility model realizes as follows:

The utility model includes the sprocket wheel that is tubular that an end has double wedge, and particularly, each sprocket wheel is by being positioned at the mutual socket of screw thread on the pipe wall.Double wedge can be uniformly distributed on the cylindrical of sprocket wheel pipe.Sprocket wheel can have four, and the height of other sprocket wheel pipes of the aspect ratio of one of them sprocket wheel pipe is big.The pipe of the sprocket wheel of pipe height maximum is outer can be socketed with a sprocket wheel.The height of the double wedge on each sprocket wheel, shape can be consistent, and the wall thickness of the pipe of each sprocket wheel can be consistent.

Additional the utility model can reach the purpose of controlling bicycle speed better on original bicycle shift sprocket wheel basis.

Existing bicycle shift sprocket wheel makes the double wedge number that is distributed in sprocket wheel one end be affected owing to be subjected to the restriction of minimum sprocket wheel pipe diameter and pipe height, thereby can not change the speed of bicycle to greatest extent.

When adding hinge wheel pipe height, the negative thread number of turns on the sprocket wheel round tube inner wall can be added, the outside thread that this negative thread can be provided with the outer wall of another minor diameter sprocket wheel pipe cooperatively interacts, by that analogy, can overlap minor diameter pipe sprocket wheel from level to level, the number of double wedge is just reduced by one-level level ground.For the double wedge spacing is equated, outside the pipe of the maximum sprocket wheel of pipe height socket a minor sprocket, the pipe height of this minor sprocket is compared little with the height of other sprocket wheel pipes.In use, as long as the utility model is matched with existing multiple tooth speed-change and gearshift of bicycle sprocket wheel, can reach the purpose of any change bicycle speed.

Advantage of the present utility model is that sprocket wheel pipe diameter can be very little, and the double wedge number also can be seldom, thereby better controls the speed of bicycle.

Below in conjunction with accompanying drawing the utility model is done further detailed description:

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

In Fig. 1, the utility model includes the sprocket wheel that is tubular (3) that an end has double wedge (1), and each sprocket wheel is by being positioned at the mutual socket of internal and external threads on pipe (2) wall.Double wedge (1) is uniformly distributed on the cylindrical of sprocket wheel pipe (2).Sprocket wheel (3) has four, and the height of other sprocket wheel pipes (2) of the aspect ratio of one of them sprocket wheel pipe (2) is big.The pipe of the maximum sprocket wheel of pipe height is socketed with a sprocket wheel outward.The height of the double wedge on each sprocket wheel (1), shape unanimity, the wall thickness unanimity of the pipe of each sprocket wheel (2).Figure number (4) is the pipe in the prior art bicycle shift sprocket wheel.

Claims

1. a bicycle shift sprocket wheel increases device, and include pipe (2) the shape sprocket wheel (3) that is that an end has double wedge (1) and it is characterized in that: each sprocket wheel (3) is by being positioned at the mutual socket of screw thread on pipe (2) wall.

2. bicycle shift sprocket wheel according to claim 1 increases device, and it is characterized in that: double wedge (1) is uniformly distributed on the cylindrical of sprocket wheel pipe (2).

3. bicycle shift sprocket wheel according to claim 2 increases device, and it is characterized in that: sprocket wheel (3) has four, and the height of other sprocket wheel pipe (2) of the aspect ratio of one of them sprocket wheel pipe (2) is big.

4. bicycle shift sprocket wheel according to claim 3 increases device, it is characterized in that: pipe (2) the highly pipe of maximum sprocket wheel is socketed with a sprocket wheel outward.

5. bicycle shift sprocket wheel according to claim 4 increases device, it is characterized in that: the height of the double wedge (1) on each sprocket wheel (3), shape are all consistent, the wall thickness unanimity of the pipe of each sprocket wheel (2).