CN-224214551-U - Non-equal-pitch periodic alternating threaded connection pair

CN224214551UCN 224214551 UCN224214551 UCN 224214551UCN-224214551-U

Abstract

The utility model discloses a non-equal-pitch periodic alternating threaded connection pair, which consists of a plurality of minimum periodic connection pair structures, wherein each minimum periodic connection pair structure consists of a standard threaded side and a non-equidistant periodic alternating threaded side. The energy transmission path is more efficiently disturbed under dynamic load, so that energy dispersion and cancellation are realized, and a loosening mechanism is more thoroughly blocked.

Inventors

WU XIAOQIAN
LIU AIYING
TANG FENG

Assignees

苏州维夏阀门制造有限公司
上海丛明机电成套设备有限公司

Dates

Publication Date: 20260508
Application Date: 20250521

Claims (4)

1. The non-constant pitch periodic alternating threaded connection pair is characterized by comprising a plurality of minimum periodic connection pair structures; The minimum period connection auxiliary structure consists of a standard thread side and a non-equidistant periodic alternating thread side, wherein in the minimum period, the difference value between the total thread pitch of the standard thread side and the total thread pitch of the non-equidistant periodic alternating thread side is constant; The non-equidistant periodic alternating thread side adopts two sizes of thread pitches, wherein the thread pitches comprise a first thread pitch and a second thread pitch, the first thread pitch is larger than the second thread pitch, and the first thread pitch and the second thread pitch regularly alternate so that the difference between the total thread pitch of the standard thread side and the total thread pitch of the non-equidistant periodic alternating thread side is constant in the minimum period or the effective working section.
2. The pair of non-uniform pitch periodically alternating threaded connections of claim 1, wherein the difference between the total pitch of the standard thread sides and the total pitch of the non-equidistant periodically alternating thread sides is less than or equal to the maximum tolerance of the thread profile fabrication plus the maximum elastic deformation of the material properties of the thread profile, and greater than or equal to zero.
3. The periodically alternating threaded connection pair with unequal pitches according to claim 1, wherein the first pitch is smaller than or equal to the pitch of the standard thread side plus the maximum tolerance of the thread profile plus the maximum elastic deformation of the material property of the thread profile and is larger than the pitch of the standard thread side.
4. The periodically alternating threaded connection of unequal pitches of claim 1, wherein the second pitch is less than or equal to the pitch of the standard thread flanks and greater than the pitch of the standard thread flanks minus the maximum tolerance of the thread profile to its maximum spring-type deformation minus the material properties of its thread profile.

Description

Non-equal-pitch periodic alternating threaded connection pair Technical Field The utility model belongs to the field of nonstandard fasteners, and particularly relates to a non-constant-pitch periodic alternating threaded connection pair. Background Vibration and bolt fatigue can cause bolt loosening or wearing and tearing, can lead to bolt pretightning force to become invalid for a long time, and then lead to taking place relative displacement between the connecting piece, between connecting piece and the bolt nut, lose the connection effect. Disclosure of utility model The utility model aims to solve the problems in the background technology, and provides a non-uniform-pitch periodic alternating threaded connection pair which can be used in all fields requiring application of threaded pairs. The technical scheme is that the non-constant pitch periodic alternating thread connection auxiliary structure consists of a plurality of minimum periodic connection auxiliary structures; The minimum period connection auxiliary structure consists of a standard thread side and a non-equidistant periodic alternating thread side, wherein in the minimum period, the difference value between the total thread pitch of the standard thread side and the total thread pitch of the non-equidistant periodic alternating thread side is constant; The non-equidistant periodic alternating thread side adopts two sizes of thread pitches, wherein the thread pitches comprise a first thread pitch and a second thread pitch, the first thread pitch is larger than the second thread pitch, and the first thread pitch and the second thread pitch regularly alternate so that the difference between the total thread pitch of the standard thread side and the total thread pitch of the non-equidistant periodic alternating thread side is constant in the minimum period or the effective working section. Further, the difference between the total pitch of the standard thread side and the total pitch of the non-equidistant periodic alternating thread side is smaller than or equal to the maximum tolerance of the thread profile manufacturing plus the maximum elastic deformation of the material property of the thread profile, and is larger than or equal to zero. Further, the first pitch is smaller than or equal to the pitch of the standard thread side plus the maximum tolerance of the thread profile plus the maximum elastic deformation of the material property of the thread profile, and is larger than the pitch of the standard thread side. Further, the second pitch is less than or equal to the pitch of the standard thread side and greater than the pitch of the standard thread side minus the maximum tolerance of the thread form minus the maximum spring-type deformation of the material properties of the thread form. Compared with the prior art, the utility model has the following advantages: (1) According to the utility model, through the alternate pitch structure, radial pressure between threads is statically increased, the anti-loosening capacity of the thread pair is improved, the energy transmission path is more efficiently disturbed under dynamic load, and energy dispersion and offset are realized, so that a loosening mechanism is more thoroughly blocked. The alternating pitch can exhibit higher anti-loosening performance in vibration testing because its complex pitch pattern can more effectively suppress fretting wear and energy accumulation. (2) According to the utility model, active energy consumption is realized through structural design, and particularly, local energy dissipation nodes are formed in alternating contact areas, so that the anti-loosening effect is more remarkable. The variable pitch design changes the equivalent stiffness of the thread pair, affecting the natural frequency. The pitch increasing area, the rigidity is reduced, and the natural frequency can be locally reduced. The standard thread is stretched during tightening, the contact surface is reduced, but a "spring-bite" effect is created. The pitch reduction region is increased in rigidity, and can suppress low-frequency vibration. When the screw is screwed down, the standard screw thread is compressed to form local interference fit, and the contact surface pressure is increased. (3) The whole effect is that the natural frequency range is widened, and single resonance peak is avoided. When there is a small difference in pitch, additional radial pressure is generated at the threaded contact surface of the two after tightening. The pressure causes the friction between the threads to increase, and the deformation of the contact surface can increase the friction between the threads to resist loosening caused by transverse vibration or impact. The local deformation forms a mechanical interlock, and the thread pitch difference forces the thread crests and roots to locally deform, thereby forming a wedging-like effect and preventing the nut from turning. (4) The alternating pitch design also