a bolt

A technology of bolts and nuts, which is applied in the direction of screws, threaded fasteners, connecting components, etc., and can solve the problems of poor performance, poor tensile strength, and fracture of bolts

CN102297188AInactive Publication Date: 2011-12-28SHANGHAI AUTOCRAFT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-12-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a bolt, which includes a nut and a screw rod. The outer circumferential surface of the screw rod has threads that match the nut; the end of the thread has a tooth mouth that engages with the nut, and the cross section of the tooth mouth is Oval. The threaded mouth with this kind of arc-shaped structure can significantly improve the bonding strength of the assembly structure after the threaded connection between the bolt and the nut, and reduce the tensile stress, shear force and other mechanical stresses that the tooth mouth is subjected to during use. The distribution is more uniform, so that the overall tensile strength of the bolt is correspondingly increased, and the overall fatigue life of the bolt is correspondingly extended.
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Description

technical field

[0001] The invention relates to the technical field of mechanical fasteners, in particular to a bolt. Background technique

[0002] As a common fastener, bolts are widely used in all aspects of machinery manufacturing and machining industries. With the continuous improvement of working intensity, people have also put forward higher requirements for the performance of bolts.

[0003] At present, the screw part of the existing bolt is processed with a thread matched with the nut to meet the connection requirements between the bolt and the nut during the assembly process. After the assembly is completed, the nut and the bolt are fixed relative to each other at the end of the threaded end of the bolt and tightly engaged.

[0004] However, although the existing bolts can meet the basic fastening needs, because the end of the thread end is only a common thread structure, the tensile strength is poor, and the thread end will be damaged during use after the bolt an...

Examples

Embodiment Construction

[0019] The core of the present invention is to provide a bolt with high tensile strength and long fatigue life.

[0020] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Please refer to figure 1 , figure 2 with image 3 , figure 1 A partial cross-sectional structural schematic diagram of a bolt provided for a specific embodiment of the present invention; figure 2 for figure 1 The enlarged structure of part A in the middle; image 3 for figure 1 The enlarged view of the structure in part B.

[0022] In a specific embodiment, the bolt provided by the present invention includes a nut 11 and a screw rod 12, the outer peripheral surface of the screw rod 12 has a thread 13 matched with the nut; the end of the thread 13 has a tooth mouth 131 engaged with the nut, and The cross ...