Lightweight high-strength motorcycle fastening bolt

Abstract

The utility model relates to the technical field of bolts, and discloses a light-weight high-strength motorcycle fastening bolt which comprises a polished rod section and a screw rod section which are connected into a whole, a limiting tail end is arranged at the tail end of the polished rod section, a first-stage inner hexagonal hole and a second-stage inner hexagonal hole are formed in the polished rod section and the screw rod section, and the first-stage inner hexagonal hole and the second-stage inner hexagonal hole are communicated with each other. Carburizing and hardening layers are arranged on the inner wall surfaces of the first-stage inner hexagonal hole and the second-stage inner hexagonal hole. The first-stage inner hexagonal hole and the second-stage inner hexagonal hole are formed in the bolt, so that the material weight of the tail end of the bolt and the overall material weight are effectively reduced, and the bolt can be conveniently matched with a wrench to be used; and the structural strength of the first-stage inner hexagonal holes and the second-stage inner hexagonal holes can be effectively enhanced through carburizing, nitriding, metal cementation and other processes in heat treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a lightweight and high-strength motorcycle fastening bolt. Background Art

[0002] Existing fixing bolts all have a thicker end with a hexagonal structure inside or outside the end for use with a wrench. However, the end is heavy after installation, and the internal strength of the bolt depends on the steel material itself, which is difficult to strengthen.

[0003] This case is proposed to improve and optimize the above-mentioned problems or shortcomings. Utility Model Content

[0004] A lightweight, high-strength motorcycle fastening bolt comprises a polished rod section and a screw section connected as one body, wherein a limiting tail end is provided at the tail end of the polished rod section, and a primary hexagonal inner hole and a secondary hexagonal inner hole are provided in the polished rod section and the screw section, and a carburized and hardened layer is provided on the inner wall surface of the primary hexagonal inner hole and the secondary hexagonal inner hole.

[0005] Preferably, the thickness of the carburized and hardened layer is mm-mm.

[0006] Preferably, the inner angle of the primary hexagonal inner hole is staggered with the inner angle of the secondary hexagonal inner hole, so that the staggered edges are conducive to increasing the internal stress resistance strength.

[0007] Preferably, the depth of the primary hexagonal inner hole does not exceed eighty percent of the length of the polished rod segment, so as to avoid excessive shear stress on the connecting section of the screw segment when twisting.

[0008] Preferably, the outer surface of the carburized and hardened layer is further provided with a nitrided or metallized layer.

[0009] Preferably, the diameter of the secondary hexagonal inner hole is not larger than the radius of the polished rod segment.

[0010] The advantages and positive effects of the utility model are: by arranging the primary hexagonal inner hole and the secondary hexagonal inner hole inside the bolt, the weight of the bolt tail end and the entire material is effectively reduced, and it is convenient to use with a wrench, and the primary hexagonal inner hole and the secondary hexagonal inner hole can effectively enhance their structural strength through processes such as carburizing, nitriding and metallizing during heat treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure. DETAILED DESCRIPTION

[0014] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0015] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings:

[0016] like Figure 1-2 As shown, the utility model describes a lightweight and high-strength motorcycle fastening bolt, comprising a polished rod section 10 and a screw section 11 connected as one body, wherein a limiting tail end 12 is provided at the tail end of the polished rod section 10, and a primary hexagonal inner hole 14 and a secondary hexagonal inner hole 15 are provided in the polished rod section 10 and the screw section 11, and a carburized and hardened layer 16 is provided on the inner wall surface of the primary hexagonal inner hole 14 and the secondary hexagonal inner hole 15.

[0017] Preferably, the carburized and hardened layer 16 has a thickness of 1 mm to 3 mm.

[0018] Preferably, the inner angle of the primary hexagonal inner hole 14 is staggered with the inner angle of the secondary hexagonal inner hole 15, so that the staggered edges are conducive to increasing the internal stress resistance strength.

[0019] Preferably, the depth of the primary hexagonal inner hole 14 does not exceed eighty percent of the length of the polished rod segment 10 to avoid excessive shear stress on the connecting section of the screw segment 11 when twisting.

[0020] Preferably, the outer surface of the carburized and hardened layer 16 is further provided with a nitrided or metallized layer.

[0021] Preferably, the diameter of the secondary hexagonal inner hole 15 is not larger than the radius of the polished rod segment 10 .

[0022] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention is not limited to the embodiments described in the specific implementation methods. Any other implementation methods derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A lightweight, high-strength motorcycle fastening bolt, characterized by: The invention comprises a polished rod section (10) and a screw rod section (11) connected as one body, wherein a limiting tail end (12) is provided at the tail end of the polished rod section (10), and a primary hexagonal inner hole (14) and a secondary hexagonal inner hole (15) are provided in the polished rod section (10) and the screw rod section (11), and a carburized hardened layer (16) is provided on the inner wall surface of the primary hexagonal inner hole (14) and the secondary hexagonal inner hole (15).

2. The lightweight and high-strength motorcycle fastening bolt according to claim 1, characterized in that: The thickness of the carburized and hardened layer (16) is 1 mm to 3 mm.

3. The lightweight and high-strength motorcycle fastening bolt according to claim 2, characterized in that: The inner angle of the primary hexagonal inner hole (14) is staggered with the inner angle of the secondary hexagonal inner hole (15), so that the staggered edges are conducive to increasing the internal stress resistance strength.

4. The lightweight and high-strength motorcycle fastening bolt according to claim 3, characterized in that: The depth of the primary hexagonal hole (14) does not exceed eighty percent of the length of the polished rod segment (10), thereby avoiding excessive shear stress on the connecting section of the screw segment (11) when twisting.

5. The lightweight and high-strength motorcycle fastening bolt according to claim 4, characterized in that: The outer surface of the carburized and hardened layer (16) is further provided with a nitriding or metallizing layer.

6. The lightweight and high-strength motorcycle fastening bolt according to claim 5, characterized in that: The diameter of the secondary hexagonal inner hole (15) is not larger than the radius of the polished rod section (10).

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