CN204186754U

CN204186754U - A kind of eccentric nut with self-locking function

Info

Publication number: CN204186754U
Application number: CN201420577599.0U
Authority: CN
Inventors: 任成明
Original assignee: Ningbo Yinzhou Guangxiang Machinery Manufacturing Co Ltd
Current assignee: Ningbo Yinzhou Guangxiang Machinery Manufacturing Co Ltd
Priority date: 2014-10-08
Filing date: 2014-10-08
Publication date: 2015-03-04
Anticipated expiration: 2024-10-08

Abstract

The utility model relates to a kind of eccentric nut with self-locking function, includes nut body; Described nut body has tapped hole, in described tapped hole, be provided with internal thread; Described nut body center line does not overlap with described tapped hole center line; In the internal thread of described nut, be less than the angle II of described inner threaded surface to the side of nut outer end and described internal thread bottom surface near the side of workpiece to be tightened and the angle I of described internal thread bottom surface; The difference of described angle I and described angle II is no more than 2 degree.The technical program makes the power of the oriented work to be tightened of nut, adds the adhesive force of nut and to be tightened, realizes self-locking function.

Description

A kind of eccentric nut with self-locking function

Technical field

The utility model belongs to fastener areas, refers to a kind of eccentric nut with self-locking function especially.

Background technique

Screw bolt and nut is the existing most widely used fastening piece fixing for workpiece, but in some specific machinery equipment or operational site, common bolt or nut fixing device can produce loosening because of the vibration in work.

In order to overcome the loosening problem that bolt or nut produce in the place being applied to vibration, show the many locking devices of technological development, although these locking devices can overcome the loosening problem of screw bolt and nut, but the cost that inevitably result in screw bolt and nut improves, and when installing, operation is numerous and diverse.

For high at radiation level, temperature is high, pressure is high, had to the place of strict demand the operating time, locking device numerous and diverse like this can have a great impact operator, can not well increase work efficiency.

In order to overcome the problem that locking device cost is high and installation procedure is numerous and diverse, those skilled in the art are devoted to find a kind of raising cost of production exceeded always, and use simple bolt or nut.

The close end of bolt conventional in existing technology is provided with pin-and-hole, after nut is screwed into bolt, prevent nut from coming off by pin, but because bolt needs, the thickness of fastening workpiece is different, specification is different, therefore, such pin-and-hole can only be specific for certain class purposes, and it can be only prevent nut from coming off from bolt, and really can not realize the fastening function of nut.

Model utility content

The purpose of this utility model is by proposing improvement opportunity scheme to the nut of existing use, by the technical program, can realizing the self-locking function of nut, and the cost of production of the raising nut exceeded, and easy to use.

The utility model is achieved through the following technical solutions:

There is an eccentric nut for self-locking function, include nut body; Described nut body has tapped hole, in described tapped hole, be provided with internal thread;

The center line of described nut body does not overlap with the center line of described tapped hole;

In the internal thread of described nut, be less than the angle II of described inner threaded surface to the side of nut outer end and described internal thread bottom surface near the side of workpiece to be tightened and the angle I of described internal thread bottom surface;

The difference of described angle I and described angle II is no more than 2 degree.

The shape of the axial cross section of described internal thread is the trapezium structure that both sides, top are provided with chamfering.

The beneficial effects of the utility model are:

The utility model is by arranging the angle of nut inner thread side, namely when the nut of the technical program is applied on vibration machine, because vibration passing is equal to the power of screw bolt and nut, at this moment, the bolt axial thrust load that two sides acting on nut inner thread produce, poor effectively because of the difference of angle, this power difference is to workpiece direction to be tightened; This power difference oppresses the outside thread of bolt with matching simultaneously, makes the power of the oriented workpiece to be tightened of nut, adds the adhesive force of nut and to be tightened, realize self-locking function.

On the other hand, because the eccentric structure of nut upper screwed hole is arranged, lateral pressure can be produced to bolt, then match with the structure of internal thread on nut, effectively can improve self-locking function.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model nut;

Fig. 2 is the plan view of the utility model nut;

Fig. 3 is the utility model female thread structure schematic diagram.

Embodiment

Describe the technical solution of the utility model in detail by the following examples, following embodiment is only exemplary, only can be used for explaining and the technical solution of the utility model being described, and can not be interpreted as being the restriction to technical solutions of the utility model.

Nut mentioned in the technological scheme of the application, be applicable to the nut of more than M22, because the screw thread being less than the nut of M22 is narrower, processing difficulties can be caused, therefore, claimant does not verify for the nut being less than M22, and therefore, the applicant can not ensure that the technical program is also applicable to be less than the nut of M22.

But not overlap this technological scheme at described nut body center line and the described tapped hole center line of the application, be applicable to the nut of any specification.

The female thread structure of the nut described in the application is applicable to the plain bolt structure of existing use, and is also not exclusively applicable to the bolt that other has modified node method, could determine after concrete applicable needs inspection.

In the technological scheme of the application, claimant is to the material selected by nut, and processing technology is not improved, and therefore, claimant is not described for the material of nut and processing method.

Shown in Fig. 3, a kind of eccentric nut with self-locking function, includes nut body 211; Described nut body 211 has tapped hole 21, in described tapped hole 21, be provided with internal thread 22; The center line X of described nut body 211 does not overlap with the center line Y of described tapped hole 21;

In the internal thread 22 of described nut, be less than the angle II212 of described inner threaded surface to the side of nut outer end and described internal thread bottom surface near the side of workpiece to be tightened and the angle I213 of described internal thread bottom surface; The difference of described angle I211 and described angle II212 is no more than 2 degree.

The principle of this technological scheme works as the power of vibration based on perpendicular bolt that vibration machine passes to bolt, at this moment perpendicular to the power of bolt equal act on two sides of nut inner thread, according to physical principle, the vertical force acted on inclined-plane can produce an axial thrust load, namely internal thread produces the component pointing to the outer extreme direction of nut near the side of to be tightened side, equally, in the face of a side of nut outer end produces the component pointing to workpiece direction to be tightened, according to the tangent principle in mathematics, the component that bevel angle is large is large, because angle I is less than angle II, now the power difference of two component is for point to workpiece direction to be tightened vertically.And now connect alternately with the internal thread of nut with the outside thread of the bolt of nut screw connection, be urged on nut inner thread adjacent with it by externally threaded power difference, make nut be subject to an effect to the power in workpiece direction to be tightened, effectively can prevent loosening of nut.

In the technological scheme of the application, the difference of described angle I and described angle II is no more than 2 degree, if more than 2 degree, the distortion of internal thread can be caused serious, and is combined with the outside thread of bolt and occurs gap, affects the fastening of screw bolt and nut.

The shape of described internal thread and described externally threaded axial cross section is the trapezium structure that both sides, top are provided with chamfering.

Although illustrate and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and spirit, scope of the present utility model is by claims and equivalency thereof.

Claims

1. there is an eccentric nut for self-locking function, include nut body; It is characterized in that: described nut body has tapped hole, in described tapped hole, be provided with internal thread;

2. the eccentric nut with self-locking function according to claim 1, is characterized in that: the shape of the axial cross section of described internal thread is the trapezium structure that both sides, top are provided with chamfering.