CN2651134Y

CN2651134Y - Chain disk for bicycle

Info

Publication number: CN2651134Y
Application number: CN 03282565
Authority: CN
Inventors: 温宜玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-26
Filing date: 2003-09-26
Publication date: 2004-10-27
Anticipated expiration: 2013-09-26

Abstract

The utility model relates to a chain disk for bicycles, which is provided with a disk. A plurality of sprockets are positioned on the outer circumference of the disk. The disk extends to the support part of convex arc shape with the same thickness toward each sprocket. The support part improves the rigidity of the chain disk, increases the strength met with the chain and reduces the deformation of the chain.

Description

A kind of chain drum that can be used for bicycle

Technical field

The utility model is a kind of chain drum that can be used for bicycle, and it relates to the technical field of bicycle, refers to be applicable to the big chain plate of bicycle or the little chain drum of speed change wheels especially.

Background technology

Bicycle all can be installed chain drum with the winding chain at crank and back wheel location, advances in order to drive bicycle.

The form of general chain drum mostly is as Fig. 6, shown in Figure 7, and chain drum 40 has a disk body 41, and disk body 41 outer peripheral edges are laid sprocket 42, and for chain 30 windings, this chain 30 sees through eight shape chain sheet 32 and is snapped at sprocket 42 by sprocket 42.

But 44 equal thickness are identical to the tip for the root 43 that sprocket 42 is extended by disk body 41, and all significantly are thinner than disk body 41.And chain sheet 32 is snapped at the stressed maximum position of sprocket 42 at root 43 places, is not tip 44.Yet root 43 positions there is no the stressed of support chain sheet 32, and chain sheet 32 thin thickness, and necessary regular interlock sprocket 42, chain sheet 32 is little with the area of contact of sprocket 42, only in the two ends end points, a period of time gets off to cause chain sheet 32 concave arc place in the middle of eight shape to produce micro-deformation.

Summary of the invention

The present utility model people designs the problem that still exists in view of the interlock of aforementioned known chain drum and chain, develop a kind of chain drum that can be used for bicycle, its rigidity of simplifying ingenious design and effectively strengthening chain drum is its main goal of the invention to support the intensity of interlock chain.

In order to reach aforesaid goal of the invention, the technological means that the utility model used is to provide a kind of chain drum that can be used for bicycle, this chain drum is provided with disk body, disk body connects continuously in outer circumferential sides stretches several sprockets, sprocket and disk body connect to stretch locates to be root, and this disk body has two end faces, disk body at least one end face than sprocket evagination, this disk body is at this end face apical margin that forms the evagination shape, at root towards at least one sprocket, extend the support sector of an external convex arc shape, this support sector can be concavo-convex relative with radian in the chain sheet of chain.

The obtainable effect of the utility model is as follows:

1. chain drum is provided with support sector at disk body, in order to increase the intensity of sprocket root, to improve the intensity of sprocket interlock;

2. chain drum is provided with support sector, corresponding chain sheet interlock sprocket, seeing through support sector comes the support chain sheet outside to be recessed radian position, make chain drum and chain inner arc place increase the actv. area of contact, reduce abrasion speed, rigidity and intensity when strengthening rigidity with the support chain gear, the more difficult chain that takes off when making the chain interlock is guaranteed good failure-free transmission agency.

3. chain drum is provided with support sector, and is simple in structure, with low cost, can effectively increase the service life of bicycle, practical.

Description of drawings

Fig. 1 is a chain drum stereo appearance figure of the present utility model;

Fig. 2 is the partial perspective view of chain drum interlock chain of the present utility model;

Fig. 3 is the exploded perspective view of chain drum of the present utility model and chain;

Fig. 4 is the assembled sectional view of chain drum of the present utility model and chain interlock;

Fig. 5 is the partial perspective view of another kind of chain drum configuration chain of the present utility model;

Fig. 6 is the planar view of existing chain drum interlock chain;

Fig. 7 is the assembled sectional view of existing chain drum and chain interlock.

Among the figure

10,40 chain drums

11,41 disk bodies

15 support sectors

20 sprockets, 21 roots

30 chains, 32,321 chain sheets

43 roots, 44 tips

The specific embodiment

The utility model is a kind of chain drum that can be used for bicycle.Basically, as shown in Figure 1, chain drum 10 has a disk body 11, extends at disk body 11 outer peripheral edges places to be distributed with sprocket 20.

Characteristics of the present utility model mainly are, disk body 11 at least one than sprocket 20 more on the end face apical margin of evagination, with the outstanding support sector 15 that forms external convex arc shape of direction towards the root 21 of sprocket 20.

For technical characterictic of the present utility model is described, illustrate with the embodiment of two kinds of chain drums 10.First kind of embodiment, please continue referring to Fig. 1, Fig. 2, Fig. 3, its disk body 11 that has shown chain drum 10 has both ends of the surface, these both ends of the surface are all than sprocket 20 evaginations, and in the apical margin position of the every corresponding root 21 towards sprocket 20 of the both ends of the surface of disk body 11, the outstanding support sector 15 that forms external convex arc shape, make the disk body 11 and the boundary line of sprocket 20 form continuously wavy, especially refer to that the corresponding chain sheet 32 of evagination radian of support sector 15 is the recessed radian position, both sides of eight shape, and support sector 15 does not correspond to the recessed radian that chain 30 is positioned at outer side chain sheet 321, the utility model is in the position adjacent to support sector 15, and whether its recessed crest degree of depth is not limited to corresponding with chain sheet 32 two ends.

As Fig. 2, Fig. 3, shown in Figure 4, after chain 30 is snapped at sprocket 20, the inner arc place of the chain sheet 32 of chain 30 be able to abut against in support sector 15, when chain drum 10 is rotated, the support sector 15 of chain drum 10 provides effective contact surface to improve rigidity intensity, so that the sprocket 20 of chain 30 is supported interlock effectively.

As shown in Figure 5, second kind of embodiment of the present utility model, it has shown that disk body 11 can pass through punch forming, form kenel with single thickness at end face than sprocket 20 evaginations, with on this evagination end face, the apical margin position of every corresponding root 21 towards sprocket 20, the outstanding support sector 15 that forms external convex arc shape can realize still that support sector 15 provides and stablize the function that chain closes chain 30.

Claims

1. chain drum that can be used for bicycle, this chain drum is provided with disk body, disk body connects continuously in outer circumferential sides stretches several sprockets, sprocket and disk body connect to be stretched the place and is root, and this disk body has two end faces, disk body at least one end face than sprocket evagination, this disk body is at this end face apical margin that forms the evagination shape, at root towards at least one sprocket, extend the support sector of an external convex arc shape, this support sector can be concavo-convex relative with radian in the chain sheet of chain.

2. the chain drum that can be used for bicycle as claimed in claim 1 is characterized in that, the equal evagination of the both ends of the surface of described disk body is provided with support sector in sprocket respectively at both ends of the surface.

3. the chain drum that can be used for bicycle as claimed in claim 2, the root of corresponding each sprocket of described disk body is equipped with a support sector.

4. the chain drum that can be used for bicycle as claimed in claim 2, the root of the corresponding chain of described disk body is provided with a support sector with the interval kenel.