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Unequal screw pitch threaded connection structure

A threaded connection and pitch technology, applied in the direction of connecting components, threaded fasteners, bolts, etc., can solve the problems of low fatigue strength and poor reliability of threaded connections

Pending Publication Date: 2018-10-16
中国船舶重工集团公司第七0三研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor reliability and low fatigue strength of the existing threaded connection structure, the present invention further proposes a threaded connection structure with unequal pitches

Method used

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  • Unequal screw pitch threaded connection structure
  • Unequal screw pitch threaded connection structure

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specific Embodiment approach 1

[0011] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, a thread connection structure with unequal pitches described in this embodiment includes an internal thread 1 and an external thread 2, the internal thread 1 and the external thread 2 are screwed together, and the pitch t1 of the internal thread 1 is greater than that of the external thread 2 pitch t2.

specific Embodiment approach 2

[0012] Specific implementation mode two: combination figure 1 and figure 2 To describe this embodiment, the pitch t1 of the internal thread 1 of the unequal-pitch screw connection structure described in this embodiment is 1.01 times the pitch t2 of the external thread 2 . Other components and connections are the same as those in the first embodiment.

[0013] working principle

[0014] In the initial state, the internal thread 2 pitch is greater than the external thread 1 pitch. After loading, the deformed internal and external thread pitches tend to be equal. The pitch increase value of the internal thread 1 should be considered with reference to the elongation of the screw under the guaranteed load of the thread, the tolerance of the internal and external threads 2, and the difficulty of installation. Preliminary research results, internal thread 1 pitch increase value Δ≈0.01t 1 . In the initial state, the distal thread teeth are in contact, and the rest of the thread ...

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Abstract

The invention relates to a threaded connection structure, in particular to an unequal screw pitch threaded connection structure. The unequal screw pitch threaded connection structure aims to solve theproblems that the existing threaded connection structure has low reliability and low threaded connection fatigue strength. The unequal screw pitch threaded connection structure comprises an internalthread and an external thread; the internal thread and the external thread are screwed together; and the screw pitch of the internal thread is more than the screw pitch of the external thread. The invention belongs to the field of machine manufacturing.

Description

technical field [0001] The invention relates to a threaded connection structure, in particular to a threaded connection structure with unequal pitches, belonging to the field of mechanical manufacturing. Background technique [0002] Currently widely used threaded connections with equal pitches of internal and external threads, the externally threaded bolt or screw will be elongated by force after loading, and the pitch will increase after the external thread is elongated; while the internally threaded nut or threaded hole will be compressed and the pitch will decrease. Since the cross-sectional area of ​​the internal thread is much larger than that of the external thread, the pitch deformation of the internal thread is negligible during the force analysis, while the pitch deformation Δm of the external thread is mainly compensated by the deformation of the bolt thread. During the loading process, the thread deformation is the largest in the first circle, and the force is al...

Claims

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Application Information

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IPC IPC(8): F16B33/02F16B37/00
CPCF16B33/02F16B37/00
Inventor 韩环成程东梅李扬杨峥刘淼宋玉柱
Owner 中国船舶重工集团公司第七0三研究所
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