阅读说明：本技术 变轴型防松螺母 (Variable-shaft type locknut ) 是由 蒋万阳 于 2020-06-04 设计创作，主要内容包括：本发明属于螺母技术领域,具体涉及一种变轴型防松螺母。本发明是一种通过给常规螺丝螺母中增加一个斜边内螺母,通过两个螺母互相单边挤压来使得两个螺母的旋转轴心发生偏斜而达到螺母锁轴效果,从而达成防松目的的。本发明生产工艺简单,替换使用方便,应用前景广阔,可大范围的应用于高铁的轨道,汽车的钢圈,各种大小型机械等有防松需求在领域。(The invention belongs to the technical field of nuts, and particularly relates to a variable-shaft type locknut. The invention relates to a nut shaft locking effect which is achieved by adding an inner nut with a bevel edge into a conventional screw nut and enabling the rotating shaft centers of two nuts to deflect through mutual single-side extrusion of the two nuts, thereby achieving the purpose of preventing looseness. The invention has simple production process, convenient replacement and use and wide application prospect, and can be widely applied to the fields with anti-loosening requirements such as high-speed rail tracks, automobile steel rings, various large and small machines and the like.)

1. A variable-axis locknut is characterized in that a unique oblique-edge inner nut is added in a conventional screw structure, so that the spiral axis of the locknut is inclined in the use process.

2. The variable-axis locknut of claim 1, wherein the oblique-side internal nut is a conventional nut, and the upper and lower surfaces of the conventional nut are obliquely cut in parallel, so that the fastening surface and the axis of the screw do not form a vertical angle, and the structure of the conventional nut does not form a vertical structure with the screw in the use process.

3. The variable axis type locknut of claim 2, wherein the helical axis of the oblique inner nut is deviated when the outer nut is asymmetrically pressed, so that the helical axis of the oblique inner nut is obliquely cut from the helical axis of the screw rather than coinciding with the helical axis of the screw, thereby allowing the rotation angles of the oblique inner nut and the conventional outer nut to interfere with each other to prevent the screw from loosening.

4. The variable axis type locknut of claim 3, wherein when the inner nut with the inclined edge is compressed by the asymmetric fixed object and the outer nut, the rotating axis of the inner nut is offset, and the larger the compression force is, the larger the offset angle of the axis is, the larger the resistance to loosening is, and the loosening is almost impossible.

5. The variable axis type locknut of claim 4, wherein the increased resistance to loosening due to the deviation of the spiral axis caused by the extrusion of the outer nut gradually disappears after the outer nut is loosened, and can be easily removed without permanent fixation.

Technical Field

The invention belongs to the technical field of nuts, and particularly relates to a variable-shaft type locknut.

Background

The screw connection has been widely used in the industries of automobiles, machine tools, aerospace, railways and the like because of the advantages of compact structure, easy assembly and disassembly, large connecting force, reusability and the like. The traditional threaded connection meets the self-locking condition under the conditions of static load action and small temperature change, the unscrewing torque between threads is smaller than the self-locking torque, the connection system is in a balanced state, effective locking can be realized, and generally, an additional anti-loosening method is not required to be introduced to prevent loosening. However, when the structure is subjected to impact and vibration, particularly to dynamic load in a transverse circulation mode, the pretightening force of the threaded connection is easy to gradually reduce, and finally, the problems of connection failure in the modes of loosening, disengaging, dropping and the like are caused. In safety and critical applications, such failures can be catastrophic.

In general, the durability of a mechanical structure is proportional to the number of bolted connections, and with the development of modern manufacturing industry, the problem of avoiding loosening of a threaded connection structure during operation has become one of the core problems of the design of the threaded connection structure at present. Therefore, it is critical to design and use a secure and reliable threaded coupling anti-loosening method. Although there are many methods for preventing loosening of threaded fasteners, there are four general methods: the first is friction anti-loosening, which mainly depends on increasing friction force; the second is mechanical anti-loosening, which is to use a pin, a gasket and a steel wire to clamp a nut; the third is rivet punching anti-loosing, mainly to rivet and weld the thread pair; the fourth is the structure anti-loose, such as Hard Lock locknut, Down's screw anti-loose, ST2 type locknut, SLB screw anti-loose, etc.

The first type of friction locking is the most widely used locking method, which generates a positive pressure between the thread pairs that is not changed by an external force, thereby obtaining a friction force that can prevent the thread pairs from rotating relative to each other. This friction can be achieved by axial or simultaneous two-way compression of the thread pairs. Such as an elastic washer, a double nut, a self-locking nut, a nylon insert locking nut and the like. The anti-loosening mode is convenient for disassembling the nut, but under the conditions of impact, vibration and variable load, the bolt can cause the pretightening force to be reduced due to loosening, the lost pretightening force is slowly increased along with the increase of the vibration times, the nut can be finally loosened and the thread coupling can be failed, and the increase of the friction force by increasing the positive pressure between the thread pairs is limited.

The second way is to use a stop to directly limit the relative rotation of the thread pairs. Such as the use of cotter pins, tandem wires, and stop washers. This kind of mode causes the dismantlement inconvenient, and its locking mode does not have the pretightning force moreover, when the bolt pine moves back to locking position, locking mode could take place the effect promptly. Thus, this approach is not anti-loosening in nature, but rather anti-drop.

The third mode is riveting and anti-loosening, which adopts the methods of punching, welding, bonding and the like after screwing, so that the screw pair loses the characteristics of the kinematic pair and is connected into non-detachable connection. The disadvantage of this method is that the bolt can only be used once and is difficult to remove, and the bolt pair must be destroyed to be removed. The application range is very limited.

The most classical anti-loose structure in the fourth structure is a Japanese Hard Lock anti-loose nut, which is improved by combining the anti-loose principle of a double nut and a convex-concave nut. The upper nut is a concave nut, the lower nut is a convex nut, the center slightly shifts during processing, eccentric processing is achieved, the effect of driving a wedge into a gap is achieved, loosening of threads is prevented, different corresponding eccentric amounts exist for different sizes and materials, manufacturing and production are troublesome, and efficiency is low.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a variable-shaft locknut,

the invention provides the following technical scheme:

a variable-axis locknut comprises a bevel nut, a conventional outer nut, a screw and a gasket;

Drawings

FIG. 1 is an exploded view of a variable-axis locknut;

FIG. 2 is a schematic view of a variable-axis locknut assembly;

FIG. 3 is a schematic axial view of an axial-varying type locknut;

FIG. 4 is a schematic view of individual parts of a variable axis locknut;

labeled as: 1-1, a conventional external nut; 1-2, a bevel-edge inner nut; 1-3, a gasket; 1-4, fastening objects; 1-5, screws; 3-1, the rotation axis of a conventional external nut; 3-2, a rotating shaft of the screw nut in the bevel edge.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

the specific implementation mode is very simple, the screw penetrates through a fixed object, a gasket is arranged, then the bevel edge nut is screwed, and finally the conventional outer nut is screwed and the bevel edge inner nut is pressed to change the shaft; when the nut is loosened, the conventional external nut and the bevel edge nut are sequentially screwed off.

Compared with the prior art, the invention has the beneficial effects that:

(1) the parallel beveling nut is simple in structure and convenient to produce, namely, the parallel beveling processing is carried out on the plane of the conventional nut, and the parallel beveling nut can be produced by any person who can adopt the sheet metal processing technology.

(2) The invention is convenient to use, and only needs to additionally arrange an inner nut with a bevel edge and then screw a conventional nut in the using process.

(3) The invention has strong anti-loosening capability, changes the moment structure by changing the axis of the bevel edge nut into the axis through the bidirectional asymmetric pressure of the outer nut and the fixture, theoretically, the fixture only can increase the anti-loosening resistance almost infinitely for any extrusion of the inner nut on the bevel edge in the loosening process as long as the structure is not damaged.

(4) The invention can be repeatedly used for many times, although the fixture can cause the deformation of the shaft of the bevel-side inner nut in the loosening process to increase the resistance, once the outer nut is taken down, the bevel-side inner nut can be easily taken down and can be repeatedly used, and the situation that the bevel-side inner nut cannot be repeatedly used like a permanent screw is avoided.

(5) The invention has wide application prospect, and can be applied to the field of easily loosened screws of high-speed rail, automobile wheels or machines, such as fixed parts and the like.