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Bolt combiner with thread pitch difference between bolt and nut

A technology of combination and pitch difference, applied in the field of mechanical parts, can solve problems such as pitch difference, and achieve the effect of improving fatigue strength, good relaxation resistance and fatigue resistance, and high availability

Inactive Publication Date: 2009-11-11
孙中强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above existing problems, the present invention provides a bolt combination with a pitch difference between the bolts and nuts.

Method used

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  • Bolt combiner with thread pitch difference between bolt and nut
  • Bolt combiner with thread pitch difference between bolt and nut

Examples

Experimental program
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Effect test

Embodiment Construction

[0014] Example 1: Such as figure 1 , 2 Shown, is a schematic diagram of the bolt structure, using a bolt with M16 specified by ISO. The bolt includes a bolt head 1, a bolt cylindrical part 2 and a threaded part 4. The threaded part 4 consists of a threaded part 3, a threaded removal part 5 and a complete Thread composition, bolt pitch P b 2mm, the thread part is obliquely removed from the thread root to form a frustum-shaped thread tooth removal part 5. The angle between the line of each tooth crest of the thread tooth removal part 5 and the bolt axis is 7% ± 1%, the longer the screw The smaller the included angle is; the smallest diameter of the frustum-shaped thread removal part 5 is gradually expanded in an arc shape to the bolt cylindrical part 2 to form a full thread part 3; the pitch of the bolt union nut P n It is 2.007mm. Due to the difference in the pitch of the bolt and the nut, when the two are rotated together, the part is easy to loosen. In the screwed state, the thr...

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Abstract

The invention relates to a bolt combiner with thread pitch difference between a bolt and a nut, which belongs to the technical field of machine parts. The bolt combiner comprises the bolt and the nut, wherein the bolt comprises a bolt head, a bolt cylindrical part and a threaded part; the threaded part consists of an incomplete threaded part, a thread tooth removing part and a complete threaded part; and the thread pitch Pn of the nut is slightly larger than the thread pitch Pb of the bolt, and the following relational expression is satisfied: (Pn-Pb) / Pb is more than or equal to 2*10 and is less than or equal to 2*10. By adjusting the thread pitch difference between the bolt and the nut in a humidity range, the bolt combiner has obvious locking effect, cannot cause loosening and fatigue damages by applying repeated varying stresses under a connection state, can surely maintain the connection state, has good anti-flaccid property and fatigue resistance, can be applicable to occasions with repeated stresses, and has extra-high industrial applicability.

Description

Technical field [0001] The invention belongs to the technical field of mechanical parts, and particularly relates to a bolt combination with a difference in pitch between bolts and nuts. It is formed by a combination of bolts and nuts that connect various machinery, structures, appliances and other components, especially It is used to prevent loosening, fatigue fracture and other phenomena in the joints of movable parts subject to external vibration. Background technique [0002] The triangular thread commonly used in bolts has high friction on the thread surface and can achieve strong fastening. On the other hand, it also has a feature: even a once-fastened bolt can be easily loosened and disassembled with a simple tool . However, even for strongly tightened bolts, in the long-term tightening and use process, the magnitude of the external force is constantly changing and is applied to the bolt. At this time, the bolt and nut rotate in the loosening direction, resulting in loosen...

Claims

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Application Information

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IPC IPC(8): F16B35/04F16B31/06F16B33/02
Inventor 西田新一孙中强
Owner 孙中强
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