CN205446335U

CN205446335U - Anti -shedding screw structure

Info

Publication number: CN205446335U
Application number: CN201620088575.8U
Authority: CN
Inventors: 沈大鈞
Original assignee: SHANGHAI LIANYING SCREWS Co Ltd
Current assignee: SHANGHAI LIANYING SCREWS Co Ltd
Priority date: 2016-01-28
Filing date: 2016-01-28
Publication date: 2016-08-10
Anticipated expiration: 2026-01-28

Abstract

The utility model provides an anti -shedding screw structure, including cap nut and screw pole, the equidistant thread form that is equipped with of screw pole periphery is trapezoidal screw thread, the upper tooth side of thread form is the 0 -25 degree with the contained angle alpha of the plumb line of the axis of thread, the lower tooth of thread form side be 30 degrees with the contained angle beta of the plumb line of the axis of thread, the anti -shedding screw structure that adopts above -mentioned structure on the one hand can with realized comparatively closely cooperating by the latch fitting, on the other hand screw and when being locked by the latch fitting, through the upper tooth side contacts and blocks by the lock screw thread with the joining and the screw thread by the latch fitting of crest for pass the vibrational force of coming along the angle by lock screw thread 30 degrees and change ascending pulling force into, thereby increased frictional force and difficult becoming flexible.

Description

A kind of anti-drop screw structure

Technical field

This utility model relates to the technical field of fastening of threaded middle practicality, particularly relates to a kind of anti-drop screw structure.

Background technology

In mechanical assembly field; the most multipart connection is realized by threaded fastener; but under high vibration effect, common threaded owing to coordinating of screw thread and screw thread being parallel contact thus often there will be the phenomenon got loose, cause a hidden trouble safely to the operation of equipment.For solving the threaded problem that gets loose, frequently with increasing lock washer, wearing the method such as check pin and chemistry gluing, but there is the problems such as installation cost is high, installing space is big, restricting condition for use is many in these methods.

Summary of the invention

For the deficiency of prior art, the purpose of this utility model is to provide a kind of simple in construction, new anti-drop screw structure easy to use, with regular screw threads with the use of the anticreep effect having had.

The technical scheme realizing this utility model purpose is as follows:

A kind of anti-drop screw structure, including cap nut and lead screw, it is trapezoidal screw thread that described lead screw periphery is provided with thread form at equal intervals, and the upper tooth side of described thread form is 0-25 degree with the angle α of the vertical line of the axis of thread, and the lower tooth side of described thread form is 30 degree with the angle β of the vertical line of the axis of thread.

Further, the crest of described thread form is 85-90 degree with the angle γ of the vertical line of the axis of thread.

The beneficial effects of the utility model are: use the anti-drop screw structure of said structure on the one hand can realize more closely cooperating with by latch fitting, when on the other hand making screw and locked by latch fitting, the screw thread of screw be linear contact lay by the screw thread of latch fitting, i.e. by the joining of described upper tooth side and crest with by the thread contact of latch fitting and block by lock screw thread, make the vibration force along being transmitted through by the angle of 30 degree of screw thread of lock change into pulling force upwards, thus increase frictional force and be not easy to loosen.

Accompanying drawing explanation

Fig. 1 is screw structural figure in this utility model embodiment.

Fig. 2 is A portion thread form amplification assumption diagram in this utility model embodiment.

Fig. 3 is screw and section of structure when being locked by latch fitting in this utility model embodiment.

Fig. 4 is screw and the graph of a relation of power when being locked by latch fitting in this utility model embodiment.

Wherein, 1-cap nut, 2-lead screw, 3-screw thread, 4-upper tooth side, 5-lower tooth side, 6-joining, 7-screw thread, 8-anti-drop screw, 9-is by latch fitting.

Detailed description of the invention

Further illustrate how this utility model realizes with embodiment below in conjunction with the accompanying drawings:

As shown in Figure 1-2, a kind of anti-drop screw 8, including cap nut 1 and lead screw 2, it is trapezoidal screw thread 3 that described lead screw 2 periphery is provided with thread form at equal intervals, the upper tooth side 4 of described thread form is 0-25 degree with the angle α of the vertical line of the axis of thread, the lower tooth side 5 of described thread form is 30 degree with the angle β of the vertical line of the axis of thread, and the crest of described thread form is 85-90 degree with the angle γ of the vertical line of the axis of thread.

As shown in Figure 3-4, when when described anti-drop screw 8 and being locked by latch fitting 9, the lower tooth side 5 of described screw thread 3 closely cooperates with by the screw thread 7 of latch fitting 9, the upper tooth side of described screw thread 3 with contacted and block by lock screw thread by 7, the screw thread of latch fitting 9 with the joining 6 of crest by described upper tooth side 4, make the vibration force along being transmitted through by lock 30 degree of angles of screw thread be converted into pulling force upwards, thus increase frictional force and be not easy to loosen.

It is specifically described below and how to increase frictional force and to be not easy to loosen.

Such as Fig. 4, release force=pulling force × COS (90 ° of-α) ＜ (normal screws) pulling force × COS60 °；

As described in above formula, compared with regular screw threads, this utility model screw thread is under conditions of equal pulling force, and the release force of generation is less than the release force of regular screw threads, and this means that the bigger pulling force of needs just can get loose.

When there is vibration, release force=vibration release force × COS (30 ° of-α) the ＜ normal screws vibration release force that vibration force converts；

Pulling force=vibration release force × COS60 °=1/2 that vibration release force converts vibrates release force；

Get loose in simulation test in vibration, vibration force one timing, vibration release force is also certain, but the release force that on this utility model screw thread form, vibration force converts is less than the vibration release force that normal screws produces, and frictional force also increases, thus in this utility model, the anti-loosing effect of screw thread form is greater than the tooth form of normal screws.

Claims

1. an anti-drop screw structure, including cap nut (1) and lead screw (2), it is trapezoidal screw thread (3) that described lead screw (2) periphery is provided with thread form at equal intervals, it is characterized in that, the upper tooth side (4) of described thread form is 0-25 degree with the angle α of the vertical line of the axis of thread, and the lower tooth side (5) of described thread form is 30 degree with the angle β of the vertical line of the axis of thread.

Anti-drop screw structure the most according to claim 1, it is characterised in that the crest of described thread form is 85-90 degree with the angle γ of the vertical line of the axis of thread.