CN113309778A

CN113309778A - Locking device that locking and mechanical locking of nut prestressing force combined together

Info

Publication number: CN113309778A
Application number: CN202110578961.0A
Authority: CN
Inventors: 贾楠
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-08-27

Abstract

The invention discloses a nut prestress anti-loose and mechanical anti-loose combined anti-loose device, which comprises a stud, a nut, an anti-loose washer, a prestress screw and a fixing screw, wherein the anti-loose washer with an inclined surface arranged on a fixed piece and the prestress screw arranged on the nut interact with each other, and simultaneously, the anti-loose device adopts the modes of prestress anti-loose (the prestress screw) and mechanical anti-loose (the anti-skid inclined surface of the anti-loose washer), thereby achieving the reliable anti-loose requirement of the nut. The anti-loosening device has the advantages of simple structure, good anti-loosening effect, capability of realizing effective loosening prevention under severe working conditions, and great popularization value.

Description

Locking device that locking and mechanical locking of nut prestressing force combined together

Technical Field

The invention belongs to the technical field of nut fastening devices, and particularly relates to a locking device combining nut prestress locking and mechanical locking.

Background

Reliable fastening of parts is a very important factor in the installation and assembly of mechanical equipment, and especially in the case of equipment subjected to vibration or impact, reliable looseness prevention of the connecting piece becomes a main consideration for the design of the equipment. The existing anti-loosening mode is mainly mechanical anti-loosening, and the mechanical anti-loosening is to directly limit the relative rotation of a locknut pair by using a locknut retainer, such as a starting gear pin, a serial steel wire, a stop washer and the like. Because the locking nut stop piece does not have the pretightning force, locking nut pine just plays the effect when moving back to the detent position. For the locking of prestress, the locking effect of prestress generated by the connecting piece in the fastening process cannot be effectively locked under the working conditions of vibration impact and the like.

Disclosure of Invention

The invention aims to provide a locking device combining nut prestress locking and mechanical locking, which has the characteristic of reliable locking.

The invention adopts the technical scheme that the anti-loosening device combining the nut prestress anti-loosening and the mechanical anti-loosening comprises a stud, a nut, an anti-loosening washer, a prestress screw and a fixing screw, wherein the stud sequentially penetrates through the nut, the anti-loosening washer and a fixed part, the anti-loosening washer is uniformly provided with a plurality of counter bores along the circumferential direction, the nut is uniformly provided with a plurality of threaded holes along the circumferential direction, and a plurality of anti-skidding inclined planes are uniformly distributed on the surface of the anti-loosening washer, which is close to the nut. .

The invention is also characterized in that:

and a fixing screw is arranged in a counter bore of the anti-loose washer.

The anti-loose washer is combined on the fixed piece through the fixing screw.

The threaded hole of the nut is internally provided with a prestressed screw.

The anti-slip inclined planes of the anti-loose washer are circumferentially arranged from low to high along the anticlockwise direction, and the included angle of the anti-slip inclined planes is larger than the lead angle of the screw thread of the stud.

The invention has the beneficial effects that: the invention relates to a locking device combining nut prestress locking and mechanical locking, which gives upward prestress to a nut through a prestress bolt arranged on the nut, and meanwhile, as the prestress bolt is propped against an anti-skid inclined plane of a locking washer, when the nut has a loosening trend, the anti-skid inclined plane can prevent the counterclockwise rotation of the nut and force the nut prestress to increase.

Drawings

FIG. 1 is a cross-sectional view of a nut pre-stressed anti-loosening and mechanical anti-loosening combination anti-loosening device of the present invention;

FIG. 2 is a cross-sectional view of the surface A-A of the anti-loose device combining the nut prestress anti-loose and the mechanical anti-loose of the invention;

FIG. 3 is a top view of a nut pre-stress anti-loosening device combined with mechanical anti-loosening according to the present invention;

fig. 4 is a schematic view of a lock washer in a nut prestress locking and mechanical locking combined locking device of the invention.

In the figure, 1, a stud, 2, a prestressed screw, 3, a nut, 4, a locking washer, 5, a fixing screw and 6, a fixed piece.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention discloses a nut prestress anti-loosening and mechanical anti-loosening combined anti-loosening device, which comprises a stud 1, a nut 3, an anti-loosening washer 4, a prestress screw 2 and a fixing screw 5, wherein the stud 1 sequentially penetrates through the nut 3, the anti-loosening washer 4 and a fixed piece 6, the anti-loosening washer 4 is uniformly provided with a plurality of counter bores along the circumferential direction, the nut 3 is uniformly provided with a plurality of threaded holes along the circumferential direction, and the surface of the anti-loosening washer 4 close to the nut 3 is uniformly provided with a plurality of anti-skidding inclined surfaces.

A fixing screw 5 is arranged in a counter bore of the anti-loose washer 4.

The anti-loose washer 4 is combined on the fixed piece 6 through the fixing screw 5.

The threaded hole of the nut 3 is provided with a prestressed screw 2.

The anti-slip inclined planes of the anti-loose washer 4 are circumferentially arranged from low to high along the counterclockwise direction, and the included angle of the anti-slip inclined planes is larger than the lead angle of the screw thread of the stud 1.

The functions of the main components in the anti-loosening device combining the nut prestress anti-loosening and the mechanical anti-loosening are respectively as follows:

1) the nut 3 is provided with uniformly distributed threaded holes for mounting the prestressed screws 2;

2) the counter bore of the anti-loose washer 4 is used for installing a fixing screw 5;

3) the prestressed screw 2 applies an upward prestress to the nut 3.

4) The included angle of the anti-slip inclined plane of the anti-loose washer 4 is larger than the lead angle of the screw thread of the stud 1, so that the prestress screw 2 can generate larger upward prestress to tighten the nut 3 when the nut 3 is loosened, and the nut 3 is prevented from rotating.

The invention relates to a locking device combining nut prestress locking and mechanical locking, which has the working principle as follows:

firstly, the lock washer 4 is combined on the fixed piece 6 through the fixing screw 5, then after the nut 3 is screwed, all the prestressed screws 2 are sequentially screwed, the end surface of each prestressed screw 2 is propped against the anti-skidding inclined surface of the lock washer 4, upward prestress is applied to the nut 3, the effect of loading anti-loosing prestress is achieved, meanwhile, as the prestressed screws 2 are fixed on the nut 3, if the nut 3 has a loosening trend, the nut 3 can rotate anticlockwise to drive the prestressed screws 2 to rotate anticlockwise, the end surface of each prestressed screw 2 is propped against the anti-skidding inclined surface 8 of the lock washer 4, and the included angle between the lock washer 4 and the anti-skidding inclined surface is larger than the lead angle of the screw of the stud 1, the prestressed screws 2 can prevent the loosening trend of the nut 3, generate larger upward prestress to tighten the nut 3, and the nut 3 is reliable.

Claims

1. The utility model provides a locking device that nut prestressing force locking and machinery locking combined together, its characterized in that, includes double-screw bolt (1), nut (3), lock washer (4), prestressed screw (2) and set screw (5), nut (3), lock washer (4) are passed in proper order in double-screw bolt (1) and by mounting (6), a plurality of counter bore has evenly been seted up along circumference in lock washer (4), nut (3) have a plurality of screw hole along the circumference equipartition, the surface equipartition that lock washer (4) are close to nut (3) has a plurality of anti-skidding inclined plane.

2. The anti-loose device of the nut prestress anti-loose combined with the mechanical anti-loose according to the claim 1 is characterized in that a fixing screw (5) is installed in a counter bore of the anti-loose washer (4).

3. The device for preventing loosening of nut prestress combined with mechanical loosening according to claim 1 is characterized in that the loosening-preventing washer (4) is fastened on the fixed piece (6) through a fixing screw (5).

4. A nut prestress anti-loose combined with mechanical anti-loose device according to claim 1, characterized in that the nut (3) has a prestress screw (2) installed in the threaded hole.

5. The anti-loosening device combining the nut prestress anti-loosening and the mechanical anti-loosening according to claim 1, wherein a plurality of anti-slipping inclined planes of the anti-loosening washer (4) are circumferentially arranged from low to high along a counterclockwise direction, and an included angle of the anti-slipping inclined planes is larger than a lead angle of the stud (1).