Externally-threaded structure matched with internal thread of wedge-shaped anti-loose thread

Abstract

The invention discloses an externally-threaded structure matched with an internal thread of a wedge-shaped anti-loose thread. The externally-threaded structure comprises an externally-threaded body. Each external thread section of the externally-threaded body comprises a guiding side, a follower side, a top and a bottom, wherein the top and the bottom extend between the guiding side and the follower side; each top is a circular arc surface formed by extending from the guiding side to a joint of the follower side in an arc mode; and each circular arc surface can be in point contact fit with aninternal thread tip in the cooperative tightening process of the external thread and an internal thread. The structure can be freely matched with traditional internal threads of JB/T10971 30-degree wedge-shaped anti-loose threads, and the matching strength is enhanced; the structure is freely matched with standard internal threads, and the use and mechanical properties are not affected; noise caused during screwing with the internal threads can be lowered; and the screwing degree of freedom is increased, and the labor intensity during installation is relieved.

Description

technical field [0001] The invention relates to a threaded fastening structure applicable to connection and fastening fields of all heavy trucks, medium trucks, light trucks and buses, in particular to an external thread structure matched with an internal thread of a wedge-shaped anti-loosening thread. Background technique [0002] With the development of the economy, the requirements for the installation, strength and fit of threaded connections are getting higher and higher, especially in industries such as automobiles. At present, as shown in Figure 1, the external thread 2 matched with the self-locking thread structure is a triangular thread that conforms to the metric, American or British thread standard. Since the thread crest is a planar structure, the two sides of the thread crest form Vertices A and B, when the crest of the external thread is in contact with the inclined surface of the internal thread, line contact is used. The contact area is small, and the contact...

AI Technical Summary

Problems solved by technology

At present, as shown in Figure 1, the external thread 2 matched with the self-locking thread structure is a triangular thread that conforms to the metric, American or British thread standard. Since the thread crest is a planar structure, the two sides of the thread crest form Vertices A and B, when the crest of the external thread is in contact with the inclined surface of the internal thread, line contact is used. The contact area is small, and the contact stress is large, which leads to "cold welding" at the contact part and "sliding teeth". " phenomenon, so in the process of using this thread pair, due to the long-term vibration of the machine or the clamped workpiece, the contact part continues to produce small compression deformation, so that the axial force of the external thread is reduced, which in turn leads to internal The clamping force of the threaded fastening member is reduced, so in summary, as shown above, as figure 1 As shown, when the current standard external thread is mated with the internal thread of JB / T10971 "30° wedge-shaped anti-loosening thread", problems such as slipping, looseness, insufficient installation freedom, limited installation, and noise are prone to occur, and during the mating process It is necessary to find the buckle point and then tighten it in one direction, which cannot achieve free fit, so it needs to be improved

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