Thread profile modification for controlled stiffness

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...

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