Threaded connection structure and design method thereof

Abstract

The invention relates to the technical field of connection structures, and particularly discloses a threaded connection structure and a design method thereof. The threaded connection structure comprises a first connecting piece and a second connecting piece, wherein the first connecting piece is provided with an internal thread, and the lead of the internal thread is a first lead P1; the second connecting piece is provided with an external thread, the lead of the external thread is a second lead P2, and |P1-P2|=delta is not equal to 0; the threaded connection length of the internal thread and the external thread is H; if P1 is larger than P2, the thickness of teeth of the internal thread is P1 / 2, and in every two adjacent teeth of the external thread, the distance L1 between every two adjacent spiral faces is larger than or equal to P2 / 2 + delta * H / P1; and if P1 is smaller than P2, the thickness of teeth of the external thread is P2 / 2, and in every two adjacent teeth of the internal thread, the distance L2 between every two adjacent spiral faces is larger than or equal to P1 / 2 + delta * H / P2. According to the threaded connection structure, the lead of the internal thread is not equal to the lead of the external thread, after the threaded connection structure is stressed, the displacement of all circles of threads is unequal, the deformation rate is equal, so that the stress of all circles of threads of the threaded connection structure is uniform, and the higher transmission strength of the threaded connection structure is realized.

Description

technical field [0001] The invention relates to the technical field of connection structures, in particular to a screw connection structure and a design method thereof. Background technique [0002] In the prior art, when a screw (or bolt) is connected to a nut, the pitch of the screw (or bolt) is the same as that of the nut, so as to ensure smooth screwing. The screw (or bolt) with the same lead and the nut match, because the lead is the same, under the load, the displacement of each tooth is equal, but the deformation rate corresponding to each thread is different, that is, each thread The stress state of the thread is different; the first thread closest to the stressed position carries about 60% of the load; the second thread receives about 30% of the load; the rest of the thread receives about 10% of the load ; Therefore, usually the effective stress thickness of the thread is 2.5 times the pitch, so that when the first thread fails, the second thread and the thread on ...

AI Technical Summary

Problems solved by technology

The screw (or bolt) with the same lead and the nut match, because the lead is the same, under the load, the displacement of each tooth is equal, but the deformation rate corresponding to each thread is different, that is, each thread The stress state of the thread is different; the first thread closest to the stressed position carries about 60% of the load; the second thread receives about 30% of the load; the rest of the thread receives about 10% of the load ; Therefore, usually the effective stress thickness of the thread is 2.5 times the pitch, so that when the first thread fails, the second thread and the thread on the side of the second thread away from the first thread have not reached their limit force state, the second circle of thread and the thread on the side of the second circle of thread away from the first circle of thread play a small role, resulting in poor load-bearing capacity of the screw (or bolt) and nut during transmission

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