CN109296625B

CN109296625B - Universal anti-loosening gasket

Info

Publication number: CN109296625B
Application number: CN201811071268.9A
Authority: CN
Inventors: 蔡小华; 何竞飞; 张开阳; 黄丹艺
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2018-09-14
Filing date: 2018-09-14
Publication date: 2020-09-01
Anticipated expiration: 2038-09-14
Also published as: CN109296625A

Abstract

The invention discloses a universal anti-loosening gasket which is structurally a circular thin plate, wherein a plurality of concentric circular teeth are punched on the upper portion and the lower portion of the anti-loosening gasket, and a plurality of concentric circular teeth are used for cutting an oblique groove along the radial direction to form radial oblique teeth. The universal anti-loosening gasket not only improves the radial frictional resistance of the circular ring contact surface, but also can improve the circumferential frictional resistance of the circular ring contact surface, and effectively prevents the gasket from sliding with the screw head and the contact surface of a connected piece when the transverse load is applied, so that the screw is prevented from being unwound under the action of a reaction torque, namely the whole screw is difficult to loosen under the action of the axial and transverse dynamic loads F1.

Description

Universal anti-loosening gasket

Technical Field

The invention relates to a universal anti-loosening gasket suitable for connection of various bolts and screws, which can prevent the bolts and the screws from being unwound and loosened under the action of axial and transverse dynamic loads.

Background

The screw connection shown in fig. 1 includes: screw 1, gasket 2, connected piece 3, base 4.

The existing gasket adopts a flat gasket, a spring gasket and a radial tooth gasket, the upper part and the lower part of the flat gasket are planes, the contact surfaces of the flat gasket, the head of the screw 1 and the connected piece 3 are circular surfaces, and the axial and transverse dynamic loads F are generated₁Under the action, the contact surfaces of the flat gaskets 2 are easy to slide. Because the screw 1 is pre-tightened and a reaction moment exists, the screw 1 is unwound under the action of the reaction moment until the screw is loosened. While the spring washer is loaded in axial and transverse directions₁Under the combined action, the contact surface is concentrated at the opening of the spring gasket, the contact area is reduced, the eccentricity is generated, and the anti-loosening effect is smaller than that of a flat gasket sometimes. The original intention of radial tooth gasket is hoped to be able to shallowly imbed in the screw 1 head and by the contact surface of connecting piece 3 under extremely big pretightning force effect, can bolt, screw connection avoid screw 1 to produce under the reaction moment and unwind, but contrary and unwillingly, when the spanner is screwed up, under extremely big pretightning force effect, or the radial tooth of radial tooth gasket is worn away, or radial tooth scratch screw 1 head and by the contact surface of connecting piece 3, the contact surface is hardened, can not be embedded, can not prevent effectively that screw 1 from producing under the reaction moment and unwinding, play locking effect.

Therefore, how to improve the contact state of

conventional gasket

2 and 1 head of screw and by connecting piece 3 top, gasket 2 and 1 head of screw and by the contact surface at connecting piece 3 top all easily produce the slip when avoiding receiving axial and horizontal dynamic load, avoid screw 1 to produce under the reaction torque effect and unwind, improve bolt, the locking effect of screw connection, ensure to connect safe and reliable, be a technological problem who awaits the solution urgently.

Disclosure of Invention

In order to solve the problems in the prior art, the present invention provides a universal anti-loosening gasket, which can effectively prevent the loosening gasket from sliding with the screw head and the contact surface of the connected piece when the bolt is subjected to a transverse load, so as to prevent the bolt from being unwound under the action of a reaction torque, thereby achieving the anti-loosening effect.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the universal anti-loosening gasket is in a circular thin plate structure, a plurality of concentric circular teeth are punched on the upper surface and the lower surface of the anti-loosening gasket, and the concentric circular teeth are formed into radial oblique teeth along a radial cutting oblique groove.

Preferably, the anti-loosening gasket is arranged between the screw head and the connected piece, when the wrench is screwed down, the concentric circular teeth and the radial oblique teeth cannot be worn off under the action of a great pre-tightening force because friction is along the circumferential direction of the concentric circular teeth and the radial oblique groove direction, and the anti-loosening gasket can be shallowly embedded into the screw head and the circular ring contact surface of the connected piece.

The universal anti-loosening gasket not only improves the radial frictional resistance of the circular ring contact surface, but also can improve the circumferential frictional resistance of the circular ring contact surface, and effectively prevents the gasket from sliding with the screw head and the contact surface of a connected piece when the transverse load is applied, so that the screw is prevented from being unwound under the action of a reaction torque, namely the whole screw is difficult to loosen under the action of the axial and transverse dynamic loads F1.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a prior art screw connection using a flat gasket;

FIG. 2 is a front view of the universal anti-loosening gasket of the present invention;

FIG. 3 is a top view of the universal anti-loose shim of the present invention;

FIG. 4 is a screw attachment view using the locking washer of the present invention;

fig. 5 is an analysis diagram of the anti-loosening performance of the flat gasket and the anti-loosening gasket.

In the figure, the number 1 is marked, the number 2 is marked, the number 3 is marked, the number 4 is marked, the number 5 is marked, and the number 4 is marked.

Detailed Description

The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, and the following examples are illustrative of the present invention and the present invention is not limited to the following examples. The invention relates to a universal anti-loosening gasket for connection of various bolts and screws, which is an anti-loosening gasket difficult to loosen under the action of axial and transverse dynamic loads F1. Therefore, the specific embodiment is described as a screw-connected universal anti-loose gasket.

As shown in fig. 2 to 3, the universal anti-loose gasket 5 provided by the invention is a circular thin plate, wherein a plurality of concentric circular teeth are stamped on the upper surface and the lower surface of the round thin plate, and a plurality of concentric circular teeth are cut along the radial direction to form radial oblique teeth.

As shown in FIG. 4, the anti-loose gasket 5 is arranged between the head of the screw 1 and the connected piece 3, when the wrench is tightened, because the friction direction is along the circumferential direction and the radial direction of the concentric circular teeth and the radial direction inclined groove, under the action of a great pre-tightening force, the concentric circular teeth and the radial direction inclined teeth on the anti-loose gasket 5 cannot be worn off, and can be shallowly embedded into the head of the screw 1 and the circular contact surface of the connected piece 3, not only the radial friction resistance of the circular contact surface is improved, but also the circumferential friction resistance of the circular contact surface is improved, the sliding of the gasket 2 with the head of the screw 1 and the contact surface of the connected piece 3 under the transverse load is effectively prevented, thereby avoiding the backing-off of the screw 1 under the action of a reaction torque, namely the whole screw connection is difficult to loosen under the action of the axial and transverse dynamic load F1, as shown in FIG. 5, the simulation result of system dynamics shows that the anti-loose performance of, almost never loose.

Furthermore, it should be noted that the present invention is described for an embodiment of a screw anti-loose washer, but is not limited to this embodiment. The shape, name, etc. of the various other bolt-on washers may be different, and what is described in this specification is merely illustrative of the present invention. All equivalent changes in the structure, characteristics and principles of the invention according to the patent concepts are included in the protection scope of the invention. Those skilled in the art can readily appreciate the spirit of the present invention from the foregoing examples and make various changes, which are within the scope of the invention, without departing from its structure or exceeding the scope as defined by the claims.

Claims

1. A universal anti-loosening gasket is characterized in that the anti-loosening gasket is a circular thin plate, the circular thin plate is provided with an upper surface and a lower surface, a plurality of concentric circular teeth are punched on the upper surface and the lower surface, partial areas of the concentric circular teeth are cut along a radial direction to form inclined teeth, the upper surface and the lower surface of the anti-loosening gasket are respectively provided with two types of tooth marks, one type is concentric circular teeth, and the other type is inclined teeth;

the oblique directions of the upper oblique teeth are consistent along the radial direction, and the oblique directions of the lower oblique teeth are consistent along the radial direction; the upper adjacent concentric circular teeth are continuous with the areas between the adjacent concentric circular teeth, and the lower adjacent concentric circular teeth are continuous with the areas between the adjacent concentric circular teeth;

the anti-loosening gasket is arranged between the screw head and the connected piece, and when the wrench is screwed down, the concentric circular teeth and the radial oblique teeth cannot be abraded under the action of a great pre-tightening force because friction is along the circumferential direction of the concentric circular teeth and the radial oblique groove direction, and the anti-loosening gasket can be embedded into the screw head and the circular ring contact surface of the connected piece.