CN102352883A - Nut - Google Patents

Abstract

The invention discloses a nut capable of effectively preventing looseness and improving tensile strength. The nut disclosed by the invention comprises a nut body. The profile of the internal tooth of the nut body comprises an oblique line and a broken line, and one end of the broken line is intersected with one end of the oblique line. In the nut disclosed by the invention, when the nut is matched with a standard bolt, the tops of all teeth of an external thread spreading over the total diameter of the bolt are tightly pushed to the slope surface of the internal tooth, the contact area between the external thread of the bolt and the internal thread of the nut is increased, so that load is evenly distributed onto all the teeth of the total diameter, and not only is the radial displacement of the external thread of the bolt reduced, but also friction is greatly increased. Therefore, the looseness probability of the nut is reduced, and the tensile strength of the nut is greatly improved.

Description

A kind of nut

Technical field

The present invention relates to a kind of nut.

Background technique

The common standard threaded fastener is being executed torsional moment hour; Its coupling mechanism force mainly concentrates on the flank of thread of first tooth; Each pitch thread subsequently of bolt nearly all is in vacant state in nut; When executing torsional moment when big; First pitch thread produces bending and shear deformation; Just make the flank of thread of second tooth bear pressure, and produce coupling mechanism force.Other each pitch threads still are in vacant state.As applying bigger moment again, the stress that is born on common standard nut first and second flank of thread is general, and impacting force on each pitch thread face is successively decreased successively thereafter all at more than 80% of its total load, even is zero.Therefore, the active force that the common standard nut is born all concentrates on first, second flank of thread, and shearing that is run into and wear-out failure are very serious, even produces " sliding tooth " phenomenon.Therefore, the real surface of contact of common standard threaded fastener only is first, second tooth place of nut, and all the other each teeth nearly all are in vacant state.The regular screw threads fastening piece is when being operated in vibrational loading condition following time, because the radial clearance that exists outside thread to move, is easy to overcome the coupling mechanism force on the screw thread surface of contact and produces from pine and rotate and get loose, and often causes serious accident after nut gets loose.For solving the problem that gets loose of threaded fastener, at present, the general problem that gets loose that adopts measures such as embedding nylon ring to solve threaded fastener.Facts have proved that adopt above-mentioned measure, the locking function of nylon ring is for once effective, can not reuse.When equipment is furnished with a large amount of nut, the workman to spend every day the plenty of time special carry out the work of tightening nut, not only increased working strength of workers, device ' also can not get ensureing.

Summary of the invention

The purpose of this invention is to provide a kind of nut that can effectively prevent to become flexible and improve tensile strength.

Technological scheme of the present invention is: the present invention includes nut body, the internal gear profile of said nut body is made up of oblique line and broken line, and broken line one end and oblique line one end intersect.

Adopt the internal gear profile to constitute among the present invention by oblique line and broken line; The straightway that intersects with oblique line on the broken line forms slope in the rotation-formed back of spiral; The internal tooth shape of nut is no longer corresponding with bolt external tooth shape; When nut cooperates with standard bolt; Because the triangle that the external screw thread shape on the bolt still maintains the standard; Externally threaded crest directly contacts with the slope of nut internal tooth; Continue to screw in nut; The externally threaded crest of bolt is withstood on the slope of nut internal tooth tightly; Influenced by the guide effect of external screw thread slope, the external screw thread self-centering of bolt is in the internal thread of nut.Because the crest that spreads all over externally threaded each tooth on its whole diameters is all pushed to the slope of internal tooth tightly; Increased the area of contact of bolt outside thread and nut inner thread; Load is distributed on each tooth of whole diameter; Not only reduced the radial displacement of bolt outside thread, frictional force is also significantly increased.Therefore, reduce the probability of nut loosening, improved the tensile strength of nut greatly.For further improving anti-loosening performance, also can on nut body, embed the Drop-proof nylon ring and reinforce.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the cut-away illustration of Fig. 1;

Fig. 3 is the local enlarged diagram of Fig. 2.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is done further explain, but do not constitute any restriction of the present invention.Illustrated in figures 1 and 2, the present invention includes nut body 1, the internal gear profile of said nut body 1 is made up of oblique line and broken line 2, and broken line 2 one ends and oblique line one end intersect.Its screw thread of nut of the present invention is directive, should earlier the nut internal tooth be had an end of slope to screw in bolt during use.The present invention is provided with mark on product when processing product, in case nut direction dress is wrong.

Claims (1)

1. a nut comprises nut body (1), it is characterized in that: the internal gear profile of said nut body (1) is made up of oblique line and broken line (2), and broken line (2) one ends and oblique line one end intersect.

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