CN100425846C - Accentric self locking nut - Google Patents

Abstract

An eccentric self-locking nut, including a threaded body. The technical points are: an eccentric sleeve is arranged at one end of the body, and an eccentric stop connected to the eccentric sleeve is built into the self-locking ring assembled on the top of the body. The eccentric stop and the eccentric sleeve It is fixed by interference fit or adhesive bonding, and a non-metallic washer is set between the eccentric spigot and the eccentric sleeve. In the initial state, between the lower end surface of the self-locking ring and the upper end surface of the body, there is a thread less than or equal to half of the thread lead. Axial clearance, the internal thread of the body is the same as that of the self-locking ring, and the thread centerline is on the same axis, the outer diameter of the eccentric sleeve is on the same axis as the inner diameter of the eccentric spigot, and the deviation between the axis and the thread centerline is at the same eccentricity axis. It fundamentally solves the problems of insufficient anti-slowness strength existing in existing anti-loosening nuts. Lock performance and service life.

Description

Eccentric self-locking nut

technical field

The invention relates to a fastener used for screw connection in mechanical equipment, in particular to an eccentric self-locking nut which is not restricted by any use conditions and completely depends on the nut itself to prevent the nut from loosening. It is mainly suitable for important threaded connection occasions that are often subject to strong vibration.

Background technique

Usually, mechanical equipment is connected by fasteners, which generally rely on the thread between the nut and the screw assembly and the built-in anti-slowness parts to prevent loosening. There are mainly the following types: built-in nylon anti-slowness ring nut, built-in anti-slowness round spring nut, Change the nut thread tooth type nut, built-in anti-slow pin (ball) self-locking nut, groove nut and cut elastic anti-slow groove nut, etc. Other anti-loosening methods include the use of nuts and additional anti-loosening parts, which include: additional spring washers, stop washers, use of adhesives, anti-loosening at punching deformation points, and so on. The above anti-loosening methods have their own advantages and disadvantages, and can only meet certain requirements for use, and the anti-loosening strength is not enough to achieve the purpose of anti-loosening. The built-in anti-slow pin (ball) self-locking nut has sufficient anti-slowness strength and basically solves the disadvantages of many anti-slow nuts, but when it is self-locking, it is easy to cause local plastic deformation of the thread of the connecting screw, and repeated use will destroy the screw thread. affect the life of the screw.

Contents of the invention

The purpose of the present invention is to provide an eccentric self-locking nut, which fundamentally solves the problems of insufficient anti-loosening strength in the existing anti-loosening nuts. , not subject to any use conditions and other advantages, significantly improving its self-locking performance and service life.

The object of the present invention is achieved in the following way: the self-locking nut includes a threaded body, the technical points of which are: an eccentric sleeve is arranged at one end of the body, and an eccentric sleeve connected to the eccentric sleeve is built in the self-locking ring assembled above the body. The eccentric spigot and the eccentric sleeve are fixed by interference fit or adhesive bonding, and a non-metallic washer is arranged between the inner end of the eccentric spigot and the top end of the eccentric sleeve, and the self-locking ring In the initial state, an axial gap less than or equal to half of the thread lead is provided between the lower end surface and the upper end surface of the body, the internal thread of the body is the same as the internal thread of the self-locking ring, and the thread center line on the same axial centerline, the outer diameter of the eccentric sleeve is the same as the axial centerline of the inner diameter of the eccentric spigot, and the deviation between the axial centerline and the thread centerline is on the same eccentric axis.

Since one end of the body of the present invention is provided with an eccentric sleeve and a self-locking ring with an eccentric stop connected to the eccentric sleeve, the internal threads of the eccentric sleeve and the self-locking ring are the same, and the thread centerlines are on the same axial centerline, and the eccentric The outer diameter of the sleeve is the same as the axial centerline of the inner diameter of the eccentric spigot, and the deviation between the axial centerline and the thread centerline is on the same eccentric axis, so when locking is required, as long as the self-locking ring is rotated relative to the body, it will The initial concentric upper and lower internal threaded holes in the self-locking ring will be offset, and the internal thread on the self-locking ring will block the external thread of the connected screw rod to generate radial force and friction force, which can prevent the coupling nut from loosening. At the same time, after the self-locking ring rotates, it is connected by the internal thread to move axially and press against the body. When the self-locking nut needs to be disassembled, the self-locking ring is turned back to the original position relative to the body to reset the self-locking ring, and the self-locking nut can be removed smoothly by turning the body, which is easy to disassemble and is not limited by any use conditions. Since the connecting threads of the connected screw and the self-locking nut are always consistent during the rotation process, the intermeshing threads are not damaged, so that the screw and the self-locking nut can be reused, and the self-locking performance and service life of the nut are significantly improved. The larger the rotation angle of the self-locking ring, the greater the eccentricity, the greater the self-locking force, and the better the anti-loosening effect. Therefore, the self-locking nut is especially suitable for important threaded joints where strong vibrations often occur.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a kind of specific structure schematic diagram of the present invention.

Fig. 2 is a sectional view along line A-A of Fig. 1 .

Fig. 3 is a schematic diagram of a usage state of the present invention.

Detailed ways

The specific structure of the present invention will be described in detail according to FIGS. 1 to 3 . The eccentric self-locking nut consists of a body 1 and a self-locking ring 2. One end of the body 1 is provided with an eccentric sleeve 4 , and the self-locking ring 2 assembled on the top of the body 1 is built with an eccentric notch 3 connected with the eccentric sleeve 4 . The internal thread of the body 1 is the same as the internal thread of the self-locking ring 2, and the center lines of the threads are on the same axial center line. In the initial installation position, the outer diameter of the eccentric sleeve 4 is the same as the axial centerline of the inner diameter of the eccentric notch 3 in the self-locking ring 2, and the deviation between the axial centerline and the thread centerline is on the same eccentric axis. At this time, the self-locking nut can be screwed on the screw rod 8 of the same specification by hand, the same as the common nut. During processing, the eccentric seam 3 in the self-locking ring 2 and the connecting sleeve 4 of the body 1 are fixed by interference fit or adhesive bonding. In the initial state, an axial gap less than or equal to half of the thread lead is provided between the lower end surface of the self-locking ring 2 and the upper end surface of the body 1 (as shown in FIG. 1 ). In order to better strengthen the self-locking ability of the body 1, a non-metallic washer (not shown) can also be set between the inner end of the eccentric notch 3 in the self-locking ring 2 and the top end of the eccentric sleeve 4 of the body 1, so that When the self-locking ring 2 is rotated and compressed, it produces an anti-loosening effect like a built-in anti-slack spring nut, further preventing the self-locking ring 2 from loosening when it is locked.

When the self-locking nut of the present invention is used to lock the connected parts 6, 7 and the connecting bolt 8 through the washer, when self-locking is required, the self-locking ring 2 is rotated by an angle relative to the body 1 in the direction of tightening the nut, and the operation very simple. At this time, the center of the inner thread of the self-locking ring 2 will be offset (relative to the inner thread of the connecting screw 8 or the main body 1). Large radial force, according to the principle of mechanics, the internal thread of the body 1 relative to the external thread of the connecting screw 8 also produces a large radial reaction force at the meshing point. Under the action of the above two radial forces, the self-locking nut and the Connecting screw rod 8 is firmly locked. This self-locking force increases with the increase of the rotation angle of the eccentric self-locking ring 2 relative to the body 1, so as to realize the locking function of anti-loosening and anti-slowness.

When it is necessary to disassemble the self-locking nut, just reset the self-locking ring 2 along the opposite direction of self-locking, and the centerline of the inner thread of the self-locking ring 2 coincides with the centerline of the inner thread of the body 1, and then the self-locking nut can be disassembled smoothly. Lock nuts, like regular nuts, are reusable.

Claims (1)

1. An eccentric self-locking nut, including a body with internal threads, characterized in that: an eccentric sleeve is provided at one end of the body, and an eccentric stop connected to the eccentric sleeve is built into the self-locking ring assembled above the body , the eccentric spigot and the eccentric sleeve are fixed by interference fit or adhesive bonding, and a non-metallic washer is arranged between the inner end of the eccentric spigot and the top end of the eccentric sleeve, and the lower end surface of the self-locking ring In the initial state, there is an axial gap less than or equal to half of the thread lead between the upper end surface of the body and the inner thread of the body is the same as the inner thread of the self-locking ring, and its thread centerline is at On the same axial center line, the outer diameter of the eccentric sleeve is the same as the axial center line of the inner diameter of the eccentric spigot, and the deviation between the axial center line and the thread center line is on the same eccentric axis.

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