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Thread profile modification for controlled stiffness

A technology of thread and external thread, applied in the field of thread pattern of clamping load holding force, can solve problems such as material deterioration, reduce bending stiffness and achieve the effect of fatigue resistance

Inactive Publication Date: 2009-05-06
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This temporal aspect of temperature change can be exacerbated by the use of different materials with different thermal expansion coefficients

Method used

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  • Thread profile modification for controlled stiffness
  • Thread profile modification for controlled stiffness
  • Thread profile modification for controlled stiffness

Examples

Experimental program
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Embodiment Construction

[0024] The following description is merely exemplary in nature, and is not intended to limit the disclosure, application, or use. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features (eg, 22, 122, 222, etc.).

[0025] figure 1 A bolt 20 is shown having a thread form or pattern 22 in accordance with the present teachings. The bolt 20 includes a head 24 and a shank 26 between the head 24 and the threaded form 22 . However, it should be understood that the thread form 22 may extend all the way to the head 24 .

[0026] Referring now to Figure 2, which shows the figure 1 An enlarged fragmentary cross-sectional view of a portion of the thread form 22. The thread form 22 includes threads 28 extending helically along the bolt 20 . Thread 28 includes crests 30 and roots 32 . The crests 30 define the major diameter d of the bolt 20 and the bases 32 define the minor diameter d of the bolt 20 3 . ...

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Abstract

The thread form can provide a controlled thread stiffness which can more evenly distribute loads and can be less sensitive to changes in relative pitch. The controlled stiffness of the thread can provide a desired cantilever bending of the thread under assembled load. The thread form can utilize a traditional thread form at and / or above the pitch diameter, thereby maintaining the area of contact close to that of a standard thread form. Standard gaging implements can be used to ascertain the thread pitch and for quality control. The thread form includes a side extending between the crest and the root. The side has a first portion extending from the crest toward the root and the second portion extending from the first portion toward the root. The first and second portions extend toward the root in different orientations relative to the thread.

Description

technical field [0001] The present disclosure relates to threaded fasteners, and more particularly to thread patterns for improving clamp load retention of bolted joints. Background technique [0002] The statements in this section merely provide background information related to the present teachings and may not constitute prior art. [0003] Threaded fasteners, such as bolts, are used to join parts together. Bolts can be used in combination with nuts or internally threaded holes in a component to hold the components together. The outer surface of the bolt and the inner surface of the nut or bore (hereinafter referred to as the threaded member) include complementary threads which axially contact when the bolt is inserted into the threaded member and rotated. The purpose of bolts and threaded members is to generate and maintain axial loads throughout the life of the parts joined together. The bolt and threaded members thus exert a clamping load on the part. Highly loaded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B33/02
CPCF16B39/30
Inventor D·H·希B·K·巴特尼克
Owner GM GLOBAL TECH OPERATIONS LLC
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