Synchronous belt for electric power-assisted bicycle

Abstract

The utility model discloses a synchronous belt for an electric power-assisted bicycle. Comprising a tooth cloth layer, a belt body, cords and a back cloth layer, the belt body comprises a tooth rubber layer and a back rubber layer, the tooth rubber layer and the back rubber layer are connected into a whole, a rope penetrates through the back rubber layer, a back cloth layer is arranged on the outer surface of the back rubber layer, the tooth rubber layer is of a tooth-shaped structure, the tooth-shaped structure is matched with belt wheel teeth, and a tooth cloth layer is arranged on the outer surface of the tooth rubber layer. The tooth cloth layer is formed by blending aramid fibers and nylon 66; a positioning groove is formed in the tooth bottom of the tooth-shaped structure of the tooth rubber layer, and the positioning groove is matched with a protruding structure on the belt wheel teeth. Due to the arrangement of the tooth cloth layer formed by blending the aramid fibers and the nylon 66, the abrasion resistance of the tooth surface of the synchronous belt is greatly improved. By means of the positioning grooves evenly formed in the tooth-shaped structure of the tooth rubber layer, the synchronous belt can be positioned when the synchronous belt is in transmission with the belt wheel, and deviation and tooth skipping of the synchronous belt are prevented.

Description

Technical field:

[0001] The utility model belongs to the technical field of synchronous belts, in particular to a synchronous belt for an electric power-assisted bicycle. Background technology:

[0002] Rubber synchronous belts are a type of belt that is currently commonly used and has high requirements in the field of personal travel bicycles or electric power-assisted bicycles.

[0003] The transmission characteristic of a synchronous belt is the meshing transmission between the belt teeth and the pulley teeth. The teeth are in direct contact with the pulley. During operation, the belt teeth will wear out, and the belt may run to one side, resulting in excessive local wear of the belt, which will affect its service life. The current industry standard method is to add retaining rings on both sides of the pulley. Although this solves the problem of deviation to a certain extent, it still has certain drawbacks when high torque is required. For example, it is easy to jump teeth, causing the pedal to step on the air. Therefore, the development of a synchronous belt that is wear-resistant, anti-slip, and has good anti-jumping performance is a problem that needs to be solved.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility model content:

[0005] The purpose of the utility model is to provide a synchronous belt for an electric power-assisted bicycle, thereby overcoming the above-mentioned defects in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides a synchronous belt for an electric power-assisted bicycle, comprising a tooth cloth layer, a belt body, a cord, and a back cloth layer; the belt body comprises a tooth rubber layer and a back rubber layer, the tooth rubber layer and the back rubber layer are connected as one body, a cord is inserted into the back rubber layer, and a back cloth layer is provided on the outer surface of the back rubber layer; the tooth rubber layer has a tooth-shaped structure, the tooth-shaped structure cooperates with the teeth of the pulley, and the tooth cloth layer is provided on the outer surface of the tooth rubber layer; the tooth cloth layer is made of a blend of aramid and nylon 66; a positioning groove is provided at the bottom of the teeth of the tooth-shaped structure of the tooth rubber layer, and the positioning groove cooperates with the raised structure on the pulley teeth.

[0007] Preferably, in the technical solution, the tooth cloth layer is treated with glue dipping.

[0008] Preferably, in the technical solution, the positioning groove is located at the center of the tooth bottom or at a lateral position of the center.

[0009] Preferably, in the technical solution, a positioning groove is provided at every i tooth bottoms in the tooth-shaped structure of the tooth rubber layer, where i=0, 1, 2, ..., n.

[0010] Preferably, in the technical solution, the positioning groove is circular or elliptical in shape.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The use of a tooth fabric layer blended with aramid and nylon 66 significantly increases the wear resistance of the timing belt tooth surface. The uniformly arranged positioning grooves on the tooth structure of the tooth rubber layer can position the timing belt when it is driving against the pulley, preventing the timing belt from running off the track and jumping the teeth. Description of the drawings:

[0013] Figure 1 This is a schematic diagram of the structure of a synchronous belt for an electric power-assisted bicycle of the present utility model;

[0014] Figure 2 This is a comparison chart of the service life test of the synchronous belt for the electric power-assisted bicycle of the utility model and the conventional synchronous belt;

[0015] Figure 3 This is a comparison chart of the overload tooth skipping test between the synchronous belt for the electric power-assisted bicycle of the utility model and the conventional synchronous belt. Specific implementation method:

[0016] The specific implementation methods of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific implementation methods.

[0017] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising", etc., will be understood to include the stated elements or components but not to exclude other elements or other components.

[0018] like Figure 1 As shown, a synchronous belt for an electric power-assisted bicycle comprises a tooth cloth layer 1, a tooth rubber layer 3, a back rubber layer 4, a cord 2, and a back cloth layer 5; the tooth rubber layer 3 and the back rubber layer 4 are connected as a whole, the back rubber layer 4 is penetrated by the cord 2, and the back cloth layer 5 is provided on the outer surface of the back rubber layer 4; the tooth rubber layer 3 is a tooth-shaped structure, which cooperates with the pulley teeth, and the tooth cloth layer 1 is provided on the outer surface of the tooth rubber layer 3; the tooth cloth layer 1 is made of a blend of aramid and nylon 66, in which aramid accounts for 1%. The blending ratio is 20%-50%, and the tooth cloth layer 1 is treated with dipping, which includes pretreatment with resorcinol formaldehyde latex and subsequent dipping with rubber mortar; in the tooth structure of the tooth rubber layer 3, a positioning groove 6 is opened at every i tooth bottom, i = 0, 1, 2, ..., n, and the positioning groove 6 is located at the center position or lateral position of the center of the tooth bottom. The shape of the positioning groove 6 is circular or elliptical, and the positioning groove 6 cooperates with the raised structure on the pulley teeth.

[0019] Test samples with a tooth shape of HTD11M, a number of teeth of 111, and a belt width of 12 cm were made using a synchronous belt for an electric power-assisted bicycle and a conventional synchronous belt. The test sample made of the synchronous belt for an electric power-assisted bicycle was used as an embodiment, and the test sample made of the conventional synchronous belt was used as comparative example 1.

[0020] The service life test of the embodiment and comparative example 1 was carried out according to GB18183-2000. The test results are as follows: Figure 2 As shown in the figure, the tooth cloth layer made of aramid and nylon 66 blended greatly increases the wear resistance of the tooth surface of the synchronous belt and extends the service life of the synchronous belt.

[0021] The overload tooth jumping test was carried out on the embodiment and comparative example 1. The test results are as follows: Figure 3 As shown, the positioning grooves evenly arranged on the tooth structure of the tooth rubber layer can position the synchronous belt when it is transmitting to the pulley, greatly reducing the deviation and tooth jumping of the synchronous belt.

[0022] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the present invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the present invention and various options and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A synchronous belt for an electric power-assisted bicycle, characterized in that: It includes a tooth cloth layer, a belt body, a cord, and a back cloth layer; the belt body includes a tooth rubber layer and a back rubber layer, the tooth rubber layer and the back rubber layer are connected as a whole, a cord is inserted into the back rubber layer, and a back cloth layer is provided on the outer surface of the back rubber layer. The tooth rubber layer has a tooth-shaped structure, the tooth-shaped structure cooperates with the pulley teeth, and a tooth cloth layer is provided on the outer surface of the tooth rubber layer; the tooth cloth layer is made of a blend of aramid and nylon 66; a positioning groove is provided at the bottom of the teeth of the tooth-shaped structure of the tooth rubber layer, and the positioning groove cooperates with the raised structure on the pulley teeth.

2. The synchronous belt for an electric power-assisted bicycle according to claim 1, characterized in that: The tooth cloth layer is treated with rubber dipping.

3. The synchronous belt for an electric power-assisted bicycle according to claim 1, characterized in that: The positioning groove is located at the center of the tooth bottom or at a lateral position of the center.

4. The synchronous belt for an electric power-assisted bicycle according to claim 1, characterized in that: A positioning groove is provided at every i tooth bottom in the tooth-shaped structure of the tooth rubber layer, where i=0, 1, 2, ..., n.

5. The synchronous belt for an electric power-assisted bicycle according to claim 1, characterized in that: The positioning groove is in a circular or oval shape.

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