CN217348118U

CN217348118U - Low-cost sprocket for electric bicycle

Info

Publication number: CN217348118U
Application number: CN202221600484.XU
Authority: CN
Inventors: 陈巧华; 金菲菲
Original assignee: Lanxi Wheel Top Cycle Industries Ltd
Current assignee: Lanxi Wheel Top Cycle Industries Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-09-02
Anticipated expiration: 2032-06-24

Abstract

The utility model discloses a low-cost chain wheel for an electric bicycle, which comprises a chain wheel main body (1), wherein an insert (2) is arranged in the middle of the chain wheel main body (1); a middle hole (3) is formed in the middle of the insert (2), and a plurality of splines (4) which are uniformly distributed are arranged on the inner side wall of the middle hole (3); the chain wheel main body (1) is matched with a spline shaft of the electric bicycle through a spline (4). The utility model discloses not only can reduce manufacturing cost, still have the commonality of sprocket main part high, structural stability is high, simple to operate and the good advantage of radiating effect.

Description

Low-cost sprocket for electric bicycle

Technical Field

The utility model relates to a sprocket for electric bicycle, especially a sprocket for low-cost electric bicycle.

Background

The chain wheel is one of important parts of the electric bicycle for transmitting power, the chain wheel for the existing electric bicycle is mostly of an integrated structure, and once the splines on the chain wheel are produced, the splines cannot be replaced, so that when the number of the splines or the shapes of the splines are changed, a corresponding special die needs to be developed again; because such a mold is a large mold including an integral sprocket structure, it is necessary to consume a large research and development cost, and thus, the production cost for producing the sprocket is increased. Therefore, the problem of high production cost exists in the production development process of the existing chain wheel, wherein the spline needs to be replaced by a new spline.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low-cost sprocket for electric bicycle. The utility model has the advantage of low production cost.

The technical scheme of the utility model: a low-cost chain wheel for an electric bicycle comprises a chain wheel main body, wherein an insert is arranged in the middle of the chain wheel main body; a middle hole is formed in the middle of the insert, and a plurality of splines which are uniformly distributed are arranged on the inner side wall of the middle hole; the chain wheel main body is matched with a spline shaft of the electric bicycle through a spline; the chain wheel is arranged to be in a mode of combining the chain wheel main body and the embedded part, and the spline matched with the electric bicycle is arranged on the embedded part, so that when the number of the splines or the shape of the splines needs to be changed, only the die for arranging the corresponding embedded part is needed, compared with the chain wheel integrated in the past, the novel finished die can be greatly reduced, and the production cost is reduced.

In the chain wheel for the low-cost electric bicycle, the position, corresponding to the insert, of the chain wheel main body is provided with the mounting hole, and the inner side wall of the mounting hole is provided with the plurality of annular riveting teeth which are uniformly distributed; a plurality of riveting grooves matched with the riveting teeth are formed in the outer side surface of the insert; the riveting teeth are matched with the riveting teeth, so that the insert can be stably connected with the chain wheel main body, and the stability of the structure is improved.

In the aforementioned sprocket for a low-cost electric bicycle, a limit ring is sleeved on one end of the insert; one end part of the riveting groove is attached to the top surface of the limiting ring; utilize the spacing ring can mutually support with the bottom surface of sprocket main part to increase the area of contact between inserts and the sprocket main part, thereby improve the laminating degree between the two, further improved the stability of structure.

In the aforementioned low-cost sprocket for an electric bicycle, the outer diameter of the stopper ring is larger than the diameter of the mounting hole.

In the aforementioned low-cost sprocket for an electric bicycle, a plurality of sprocket teeth are uniformly distributed in an annular shape on the outer surface of the sprocket body.

In the aforementioned sprocket for a low-cost electric bicycle, the sprocket body is provided with a plurality of annularly distributed fan-shaped through holes; utilize fan-shaped through-hole can increase the sprocket in the use, the mobility of ambient air has improved the radiating effect.

Compared with the prior art, the utility model discloses improved current sprocket for electric bicycle, through set up the sprocket into by sprocket main part and inserts form of combination, and with electric bicycle matched with spline set up on the inserts, thereby when the quantity that needs to change the spline or the shape of spline, only need to set up the mould of corresponding inserts can, compared with the sprocket of integral type in the past, can great reduction new finished product's mould, reduced manufacturing cost; and the chain wheel main body can be suitable for various inserts, so that the universality of the chain wheel main body is improved, the research and development cost is reduced, and the development period is shortened. In addition, the utility model also improves the stability of the structure by arranging the riveting teeth on the chain wheel main body and arranging a plurality of riveting teeth on the outer side surface of the embedded piece, and utilizing the mutual matching of the riveting teeth and the riveting teeth, so that the embedded piece can be stably connected with the chain wheel main body; the limiting ring is sleeved on the insert, and the outer diameter of the limiting ring is set to be larger than the diameter of the mounting hole, so that the limiting ring can be matched with the bottom surface of the chain wheel main body, the contact area between the insert and the chain wheel main body is increased, the fitting degree between the insert and the chain wheel main body is improved, and the stability of the structure is further improved; the limiting ring can limit the depth of the insert installed in the installation groove, so that the phenomenon of over-head installation is avoided, and the installation is convenient; through be equipped with a plurality of annular evenly distributed's fan-shaped through-hole on the sprocket main part, utilize fan-shaped through-hole can increase the sprocket in the use, the mobility of surrounding air has improved the radiating effect. Therefore, the utility model discloses not only can reduce manufacturing cost, still have the commonality of sprocket main part high, structural stability is high, simple to operate and the good advantage of radiating effect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a front view of the present invention;

fig. 3 is a rear view of the present invention;

FIG. 4 is a schematic view of the construction of the insert;

FIG. 5 is a schematic structural view of the sprocket body;

fig. 6 is a partially enlarged view of a portion a in fig. 2.

The symbols in the drawings are: 1-a chain wheel main body, 2-an insert, 3-a middle hole, 4-a spline, 5-a mounting hole, 6-a riveting tooth, 7-a riveting groove, 8-a limiting ring, 9-a chain wheel tooth and 10-a fan-shaped through hole.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Examples are given. A low-cost chain wheel for an electric bicycle is shown in figures 1 to 6 and comprises a chain wheel main body 1, wherein an insert 2 is arranged in the middle of the chain wheel main body 1; a middle hole 3 is formed in the middle of the insert 2, and a plurality of splines 4 which are uniformly distributed are formed in the inner side wall of the middle hole 3; the chain wheel main body 1 is matched with a spline shaft of the electric bicycle through a spline 4.

A mounting hole 5 is formed in the position, corresponding to the insert 2, of the chain wheel main body 1, and a plurality of annular and uniformly distributed riveting teeth 6 are arranged on the inner side wall of the mounting hole 5; a plurality of riveting grooves 7 matched with the riveting teeth 6 are formed in the outer side surface of the insert 2; one end part of the insert 2 is sleeved with a limiting ring 8; one end part of the riveting groove 7 is attached to the top surface of the limiting ring 8; the outer diameter of the limiting ring 8 is larger than the diameter of the mounting hole 5; a plurality of annular uniformly distributed sprocket teeth 9 are arranged on the outer surface of the sprocket body 1; the chain wheel main body 1 is provided with a plurality of fan-shaped through holes 10 distributed annularly.

The working principle is as follows: when the chain wheel is used, firstly, the riveting groove 7 on the insert 2 is aligned with the riveting tooth 6 on the mounting hole 5 on the chain wheel main body 1, then the insert 2 is mounted in the mounting hole 5, the riveting groove 7 is matched with the riveting tooth 6, so that the insert 2 can be stably mounted on the chain wheel main body 1, the insert 2 is pushed until the surface of the limiting ring 8 is mutually attached to the side surface of the chain wheel main body 1, and the assembly is completed; then, aligning the middle hole 3 on the insert 2 to a spline shaft of the electric bicycle to be installed, and utilizing the mutual matching of the spline 4 on the middle hole 3 and the spline shaft, the electric bicycle can be used for transmission; when the integral key shaft pivoted in-process, the integral key shaft can drive inserts 2 through spline 4 and rotate, and inserts 2 pivoted in-process can drive sprocket main part 1 through riveting groove 7 and riveting tooth 6 and rotate, realizes the kinetic energy transmission.

Claims

1. The utility model provides a sprocket for low-cost electric bicycle which characterized in that: the chain wheel comprises a chain wheel main body (1), wherein an insert (2) is arranged in the middle of the chain wheel main body (1); a middle hole (3) is formed in the middle of the insert (2), and a plurality of splines (4) which are uniformly distributed are arranged on the inner side wall of the middle hole (3); the chain wheel main body (1) is matched with a spline shaft of the electric bicycle through a spline (4).

2. The low cost sprocket for an electric bicycle according to claim 1, wherein: a mounting hole (5) is formed in the position, corresponding to the insert (2), of the chain wheel main body (1), and a plurality of annular and uniformly distributed riveting teeth (6) are arranged on the inner side wall of the mounting hole (5); and a plurality of riveting grooves (7) matched with the riveting teeth (6) are formed in the outer side surface of the insert (2).

3. The low cost sprocket for an electric bicycle according to claim 2, wherein: one end part of the insert (2) is sleeved with a limiting ring (8); one end part of the riveting groove (7) is attached to the top surface of the limiting ring (8).

4. The low cost sprocket for an electric bicycle according to claim 3, wherein: the outer diameter of the limiting ring (8) is larger than the diameter of the mounting hole (5).

5. The low cost sprocket for an electric bicycle according to claim 1, wherein: the outer surface of the chain wheel main body (1) is provided with a plurality of chain wheel teeth (9) which are uniformly distributed in an annular shape.

6. A low cost sprocket for an electric bicycle according to any one of claims 1 to 5, wherein: the chain wheel main body (1) is provided with a plurality of fan-shaped through holes (10) which are distributed annularly.