CN201407270Y - Anti-loosing inner thread part - Google Patents

Abstract

An anti-loosing inner thread part comprises a thread part main body and an inner thread which extends out from the inner side of the thread part main body in a helical mode, wherein a part of or all the inner thread comprises a first oblique plane, a second oblique plane and a third oblique plane which are orderly intersected, wherein the second oblique plane is a wedge-shaped oblique plane whichis specially arranged on the tooth bottom of the inner thread, and when a common external thread is mutually screwed with the anti-loosing inner thread, the tooth point of the external thread tightlyprops up the wedge-shaped oblique plane. Furthermore, the included angle between the second oblique plane and the perpendicular of the axial cord of the thread is 60-80 degrees, thereby the included angle between the second oblique plane and the perpendicular of the axial cord of the thread is more bigger than the included angle of 30 degrees of a common thread, the generated normal pressure and the friction force are increased, and the thread does not easily loose. The anti-loosing inner thread part provided by the utility model can be widely used for various parts with inner threads, can bematched with a common external thread, is used for linking spare parts, and effectively solves the problem of the loosing of fasteners.

Description

Locking internal thread part

Technical field

The utility model relates to a kind of internal thread part with anti-loosening property.

Background technique

The too busy to get away thread part that is linked and packed between machine part or part is as fastening piece etc.Scyewed joint brings great convenience to every profession and trade.But there are distinct issues in it, and under impact, vibration or varying load effect, or when temperature variation was big, scyewed joint might be become flexible, even throws off fully, causes the accident.

For solving the problem that gets loose of scyewed joint, be born from threaded fastener, many scientists and engineers have done a large amount of tests and research, adopted multiple locking measure, the main utilization strengthened principles such as rubbing, directly pin and destroy the screw pair relation, example has: adopt methods such as locking plate, pin, nylon embed, distortion screw thread, chemical gluing, delayed the time that fastening piece gets loose voluntarily to a certain extent, but these methods can't be dealt with problems except that the shortcoming that has complicated operation, is unfavorable for repeating to install and remove at all.

Thread profile is the basis of realizing its function.Be that 60 ° triangle regular screw threads are as connecting thread, because of it has self-locking performance generally with the tooth form angle.Regular screw threads are analyzed as can be known, fastening piece tightens that the back is main stressedly buckles on the tooth at first and second, each tooth Surface of action strength of back die-offs, when screw-down torque increases, the first button screw thread is easy to produce distortion and shear deformation, so just can make the second button Surface of action bear pressure and produce coupling mechanism force, by that analogy, the shearing of each tooth and wear-out failure are very serious, can cause sliding tooth, rotation, inefficacy between fastening piece after being given a shock.

The model utility content

The purpose of this utility model is, a kind of novel locking internal thread part is provided, by improving the stressing conditions of existing regular screw threads, to solve the problem that fastening piece gets loose.

The utility model adopts following technological scheme:

A kind of locking internal thread part comprises the thread part main body and stretches out and the internal thread that forms from the inboard spiral of described thread part main body that part or all of described internal thread comprises three first inclined-plane, second inclined-plane and the 3rd inclined-planes that intersect successively.This second inclined-plane is the wedge shape inclined-plane that is provided with especially in internal thread tooth bottom, when outside thread and internal thread revolves mutually and the time, externally threaded cusp withstands on this wedge shape inclined-plane tightly.

Further, the angle of described second inclined-plane and axis of thread vertical line is 60～80 °.Because of angle between the vertical line of this second inclined-plane and the axis of thread is 60～80 ° of 30 ° much big than regular screw threads, so the normal pressure and the frictional force that produce all increase, screw thread is difficult for loosening.

Further, the intersection point on described second inclined-plane and described first inclined-plane is lower than the intersection point on described second inclined-plane and the 3rd inclined-plane.

Further, the angle of described the 3rd inclined-plane and axis of thread vertical line is 30～45 °.The angle of described first inclined-plane and axis of thread vertical line is 30～45 °.By strengthening the thread groove width between described first inclined-plane and the 3rd inclined-plane, guaranteed that common outside thread tooth form can realize all that in whole tolerance range cusp withstands on the wedge shape inclined-plane, realize locking.

The locking internal thread part that the utility model provides can be widely used in various parts with internal thread, and can cooperate with common outside thread, is used to connect component, efficiently solves the problem that part gets loose.

Further specify the utility model below in conjunction with drawings and Examples.

Description of drawings

Fig. 1 is an internal thread tooth form structural representation among the locking internal thread part embodiment;

Fig. 2 is an internal thread force analysis schematic representation.

Fig. 3 is common internal thread tooth form schematic representation.

Embodiment

A kind of locking internal thread part, comprise the thread part main body and stretch out and the internal thread that forms from the inboard spiral of described thread part main body, as shown in Figure 1, part or all of described internal thread 10 comprises three first inclined-plane 1, second inclined-plane 2 and the 3rd inclined-planes 3 that intersect successively.

Wherein, described second inclined-plane 2 is 60～80 ° with the angle β of axis of thread vertical line.

Wherein, the intersection point on described second inclined-plane 2 and described first inclined-plane 1 is lower than the intersection point on described second inclined-plane 2 and the 3rd inclined-plane 3.The direction of arrow is internal thread 10 thrust load directions among Fig. 1.

Wherein, described the 3rd inclined-plane 3 is 30～45 ° with the angle (tooth form angle) of axis of thread vertical line.Described first inclined-plane 1 is 30～45 ° with the angle (tooth form angle) of axis of thread vertical line.

Dotted line is depicted as the original triangle of internal thread 10 among Fig. 1, and it is non-equilateral triangle, and bottom side length equals pitch P.By angle original triangle height as can be known $H=0.5P~\frac{\sqrt{3}}{2}P,$ H1 prunes, again from bottom surface H2 height as the inclined-plane starting point, be 60～80 ° with the vertical line angle of the axis of thread and cut out second inclined-plane 2, just constituted the basic profile of internal thread 10, this tooth form is not the total tooth form of internal and external threads, and the outside thread basic profile of Pei Heing is the tooth form of regular screw threads with it.

As shown in Figure 2, the relative movement of screw pair under moment and Axial Loads, the horizontal force that can regard footpath in acting on as promotes slide block and moves along screw thread.Wherein, F is an external force, and Fn is a normal reaction, and fFn is a frictional force, and Fa is a thrust load, and ψ is a lead angle, ρ ^/Be equivalent friction angle, F _RBe resultant force.For the non-rectangle screw thread, when the inclined-plane constant speed glides, do force analysis when slide block and can obtain F=Fa*tg (ρ ^/-ψ), ${\mathrm{\ρ}}^{/}=\mathrm{arctg}\frac{f}{\cos \mathrm{\β}},$ Promptly $F=\mathrm{Fa}*\mathrm{tg}(\mathrm{arctg}\frac{f}{\cos \mathrm{\β}}-\mathrm{\Ψ}),$ Wherein β is the angle of internal thread stress surface and axis of thread vertical line, and when Fa was identical, the β value was big more, the F value is big more, and β among Fig. 1=60～80 °, common internal thread stress surface β among Fig. 3=30 °, needed external force F is big more a lot of than regular screw threads so that locking internal thread gets loose in institute.Therefore this internal thread has good locking effect.

Because described second inclined-plane 2 is the wedge shape inclined-plane, therefore can also eliminate the problem of regular screw threads discontinuity, common internal and external threads revolve and the time, mainly stressed only is first of nut, the second pitch thread contacting point, all the other each teeth do not stress basically, and novel locking internal thread and common external thread rotary and the time outside thread each sound of baby talk point all withstand on tightly on second inclined-plane 2, the contact of formation helix, and the load that every tooth bears on the helix is all compared evenly, same load can be distributed to each face, on each point, make that to produce locking frictional force on the screw thread everywhere close, can effectively resist transverse vibration.

As shown in Figure 1, the tooth form angle on first inclined-plane 1 be 30～45 ° greater than 30 ° of regular screw threads, the tooth form angle on the 3rd inclined-plane 3 be 30～45 ° greater than 30 ° of regular screw threads, by increasing thread groove width, to guarantee that common outside thread all can reach the effect that cusp withstands on the wedge shape inclined-plane in tolerance range, realize locking.

Above-described embodiment only is used to illustrate technological thought of the present utility model and characteristics, its purpose is to make those skilled in the art can understand content of the present utility model and implements according to this, can not only limit claim of the present utility model with present embodiment, be all equal variation or modifications of doing according to the spirit that the utility model disclosed, still drop in the claim of the present utility model.

Claims (5)

1, a kind of locking internal thread part, comprise the thread part main body and stretch out and the internal thread that forms that it is characterized in that: part or all of described internal thread comprises three first inclined-plane, second inclined-plane and the 3rd inclined-planes that intersect successively from the inboard spiral of described thread part main body.

2, locking internal thread part according to claim 1, it is characterized in that: the angle of described second inclined-plane and axis of thread vertical line is 60～80 °.

3, locking internal thread part according to claim 1 and 2, it is characterized in that: the intersection point on described second inclined-plane and described first inclined-plane is lower than the intersection point on described second inclined-plane and the 3rd inclined-plane.

4, locking internal thread part according to claim 3, it is characterized in that: the angle of described the 3rd inclined-plane and axis of thread vertical line is 30～45 °.

5, locking internal thread part according to claim 4, it is characterized in that: the angle of described first inclined-plane and axis of thread vertical line is 30～45 °.

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