Tooth sheet protective cover

Abstract

The utility model discloses a tooth piece protective cover, which is arranged on one side of a tooth piece facing a rider, and is characterized in that a plurality of locking nuts are distributed on one side of a cover body of the protective cover facing the tooth piece, and the locking nuts and the cover body are integrated. On one hand, the metal locking nut integrated with the cover body is fixedly connected with the tooth piece, and on the other hand, the tooth part structure is arranged on the peripheral surface of the locking nut to change a torque transmission structure between the locking nut and the cover body when the locking nut is subjected to external force, so that the locking nut can be stably fixed on the cover body; the purpose of improving the connection performance between the protective cover and the tooth sheet is achieved.

Description

Technical Field

[0001] The utility model relates to the field of bicycle transmission gear plates, in particular to a gear plate protection cover. Background Art

[0002] In order to prevent the rider's body or clothing from directly contacting the gears and causing scratches during riding, it is usually Figure 1 As shown, a protective cover 2 is provided on the side of the tooth piece 1 facing the rider. The protective cover 2 is made of plastic and is fixed by self-tapping screws 3 that penetrate the tooth piece 1 and penetrate into the protective cover 2. During the tightening process of the self-tapping screws 3, the screw column of the protective cover 2 is squeezed. If the prepared hole is too small, the screw column will be squeezed out (this problem is very serious in a cold environment). If the prepared hole is too large, the locking force will be insufficient and the protective cover will easily fall off. Considering the low strength of the protective cover 2 made of plastic, the shear force generated by speed changes or vibrations during riding will be concentrated at the locking point between the self-tapping screws 3 and the screw column of the protective cover 2. The destructive tapping of the self-tapping screws 3 will cause stress changes in the locking point, which is very easy to become loose due to stress concentration. Moreover, once the protective cover 2 made of plastic is damaged, it cannot be re-tightened and can only be directly scrapped. Utility Model Content

[0003] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0004] A gear protection cover is provided. The protection cover is placed on the side of the gear facing the rider. A plurality of locking nuts are arranged on the cover body of the protection cover. The locking nuts are integrated with the cover body.

[0005] In a preferred embodiment of the present invention, the locking nut has a nut boss extending toward the tooth piece, a connecting hole is provided at the center of the nut boss, and the connecting hole cooperates with a fastener to fix the protective cover on the tooth piece.

[0006] In a preferred embodiment of the present invention, the connecting hole has an internal thread structure, and the connecting hole cooperates with a threaded fastener to fix the protective cover.

[0007] In a preferred embodiment of the present invention, a plurality of fixing bosses corresponding to the locking nut are provided on the cover body, the plurality of fixing bosses are arranged along the circumferential extension direction of the cover body, and the locking nut is integrally provided in the fixing bosses through the base.

[0008] In a preferred embodiment of the present invention, an extended tooth portion is arranged on the outer peripheral surface of the base, and the tooth portion increases the contact surface with the fixing boss.

[0009] In an optimal embodiment of the utility model, the outer peripheral profile surface of the base is circular.

[0010] The utility model discloses the beneficial effect lies in:

[0011] The utility model provides a tooth piece protection cover, one side adopts the metal lock nut of integral structure with the cover body and is fixedly connected with tooth piece, and the other side arranges the tooth portion structure on the outer periphery surface of lock nut and changes the torque transmission structure between lock nut and cover body when being under external force, makes lock nut can be steady on the cover body, reaches the purpose of improving the connecting performance between protection cover and tooth piece. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description.

[0013] Figure 1 It is prior art schematic diagram.

[0014] Figure 2 It is the structure schematic diagram of the cover body of the utility model.

[0015] Figure 3a And Figure 3b It is the structure and arrangement schematic diagram of lock nut first kind of implementation.

[0016] Figure 4a And Figure 4b It is the structure and arrangement schematic diagram of lock nut second kind of implementation.

[0017] Figure 5 It is the assembly sectional view of the utility model. DETAILED DESCRIPTION

[0018] In the description of the utility model, it needs to be explained that the orientation or position relation of the terms "upper", "lower", "left", "right", "inner", "outer" etc.

[0019] In the description, when one element is located on another element, fixed to another element, connected to another element, engaged to another element or the like, the element can be directly located on another element, fixed to another element, connected to another element, engaged to another element or contact another element, or there can be an intermediate element.

[0020] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. However, it should be understood that the present application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide many additional embodiments. In all figures, the same reference numerals represent the same elements or elements with the same function.

[0021] refer to Figure 2 A tooth plate protective cover is provided, wherein a plurality of fixing bosses 22 for accommodating locking nuts 30 are provided on the cover body 21. Several fixing bosses 22 are arranged in a circular shape on the side of the cover body 21 facing the tooth plate 1. The locking nut 30 forms an integrated structure with the fixing boss 22 through a process such as integral injection molding to enhance the firmness between the two. Specifically, the locking nut 30 is fixed to the fixing boss 22 by fusing its lower base 33. A boss 31 is provided at the other end of the locking nut 30, and a connecting hole 32 is provided in the boss 31. In this way, the cover body 21 is fixed to the tooth plate 1 by fasteners. The tooth plate 1, the locking nut 30 and the fastener are all made of metal material, which can effectively prevent structural damage due to improper torque control when the fastener 4 is locked with the locking nut 30. Preferably, a threaded structure is arranged in the connecting hole 32, so that the cover body 21 can be fixed with universal parts such as screws or bolts.

[0022] In another embodiment, a tooth structure 34 is arranged around the outer circumference of the base 33. Due to the lightweight requirements of bicycles, the cover 21 is usually made of plastic. Although the locking nut 30 and the cover 21 are made through an integrated process (such as injection molding, etc.) to improve the fixing performance between the two, cracks may still appear between the locking nut 30 and the cover 21 when the locking torque exceeds the tolerance. Therefore, the tooth structure 34 changes the way the torque between the locking nut 30 and the cover 21 is transmitted when an external force is applied, especially by providing a greater fixing force through the concave surface 34a perpendicular to the torque F. At the same time, the concave and convex tooth structure 34 also increases the contact area between the locking nut 30 and the fixing step 22, further improving the connection performance between the two.

Claims

1. A gear protection cover, the protection cover is placed on the side of the gear facing the rider, characterized in that: A plurality of locking nuts are arranged on the side of the cover body of the protective cover facing the tooth plate. The locking nuts and the cover body are an integral part. A plurality of fixing bosses corresponding to the locking nuts are arranged on the cover body. The fixing bosses are arranged along the circumferential extension direction of the cover body. The locking nuts are integrally arranged in the fixing bosses through the base.

2. A gear protection cover according to claim 1, characterized in that: The locking nut has a nut boss extending toward the tooth piece, and a connecting hole is provided at the center of the nut boss. The connecting hole cooperates with a fastener to fix the protective cover on the tooth piece.

3. A gear protection cover according to claim 2, characterized in that: The connecting hole has an internal thread structure, and the connecting hole cooperates with a threaded fastener to fix the protective cover.

4. The tooth blade protection cover according to claim 3, characterized in that: An extended tooth portion is arranged on the outer peripheral surface of the base.

5. The gear protection cover according to claim 3, characterized in that: The outer peripheral contour surface of the base is circular.

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