CN202900942U

CN202900942U - Stop nut

Info

Publication number: CN202900942U
Application number: CN 201220590005
Authority: CN
Inventors: 蒋群力; 邵国宏; 吴慧; 曹国洪
Original assignee: CHANGSHU STANDARD COMPONENT FACTORY
Current assignee: Changshu City Standard Parts Factory Co ltd
Priority date: 2012-11-12
Filing date: 2012-11-12
Publication date: 2013-04-24
Anticipated expiration: 2022-11-12

Abstract

The utility model belongs to the technical field of fasteners and provides a stop nut. The stop nut comprises a nut body, an internal thread hole is reserved in the center of a shaft of the nut body, and inner wall of the internal thread hole is evenly separately laid with a plurality of screw alveolars. The stop nut is characterized in that a meshing surface is disposed at the bottom of each screw alveolar and is against external threads on a bolt or a screw, and the meshing surface is a wedge slope forming an angle of 30 degrees with an axial center line of the internal thread hole. The stop nut has advantages of reliable and stable anti-seismic and anti-loosening performances and high tensile strength to guarantee use safety. Furthermore, the stop nut is simple and easy to use, capable of achieving anti-loosening effect with no spring washers or lock washers needed, capable of being repeatedly assembled and disassembled and used so as to prolong service life, capable of reducing assembly cost and improving assembly efficiency, simple and convenient to do quality testing, capable of being widely used, and applicable to assembly of high-precision fasteners in various industries.

Description

End loose nut

Technical field

The utility model belongs to technical field of fastening, is specifically related to a kind of loose nut that ends, and is the improvement to existing nut structure

Background technique

Nut is a kind of common parts that are fastenedly connected, usually and bolt or screw rod be used in conjunction with.The structure of existing nut comprises: nut body, axial centre at described nut body offers interior threaded hole, the sectional shape of each thread groove of interior threaded hole is isosceles trapezoid, thread groove bottom land be used for bolt or screw rod on the inconsistent tooth of outside thread tooth nibble face be one with the longitudinal center line direction of nut body parallel plane mutually, this structure in actual use, make easily to occur between nut and bolt or the screw rod becoming flexible, affect fastening effect.The reason that thread looseness occurs mainly contains two kinds: a kind of is that connection between the screw pair is loosening; Another kind is the screw thread fatigue ruption under the alternating stress effect.In the ordinary course of things, be threaded life-span of loosing prevention far below the fatigue life that is threaded, that is to say the inefficacy that gets loose with regard to having occurred causing screw pair because of loosening before the screw thread fatigue ruption, perhaps occurred destroying because of the loosening premature fatigue of link and connected piece that causes, therefore the loosening inefficacy that is threaded directly affects the normal operation of product and equipment, even causes serious consequence.

Loosening for what prevent from being threaded, common mode mainly contains three kinds at present: the first is that friction is locking, this mode is to produce a positive pressure that does not change with external force between screw pair, can stop in relative rotation frictional force of screw pair to produce one, this positive pressure can by axially or axially with radially simultaneously the collet threaded pair realize, for example: employing spring washer, double nut, metal self-locking nut or nylon inserts locking nut etc.This locking mode is more convenient for the dismounting of nut, but in the situation that being connected with the alternate load screw thread because of the loosening pretightening force that causes between connecting, impact shock descends, along with the increase of vibration number, the pretightening force of loss slowly increases, and finally will cause the nut inefficacy that gets loose; The second is that machinery is locking, and this method is directly to limit the relative movement of screw pair with retainer, and such as employing cotter pin or lock washer etc., but this mode causes dismounting inconvenient; The third is that chemistry is locking, this mode is to apply one deck immersion coating in external threaded surface, to increase the frictional force between the internal and external threads, prevent screw pair from producing relative rotation in the course of the work and get loose, this mode has advantages of easy to use, but in screw pair uses, should not repeatedly dismantle, in the repeated removal using process, can cause between screw pair frictional force constantly to descend and lose anti-loosing effect.

In view of above-mentioned prior art, the applicant has done actively and effectively to attempt, and technological scheme described below produces under such background

Summary of the invention

The purpose of this utility model be to provide a kind of simple in structure, anti-loosing effect good, tensile strength is high and long service life end loose nut.

The purpose of this utility model reaches like this, a kind ofly end loose nut, comprise nut body, axial centre at described nut body offers interior threaded hole, be furnished with a plurality of thread grooves between equably on the inwall of described interior threaded hole, be characterized in: each thread groove bottom land be used for bolt or screw rod on the inconsistent tooth of outside thread tooth to nibble face be one to be the wedge shape inclined-plane of 30 ° of angles with the longitudinal center line direction of interior threaded hole.

The utility model is by nibbling the change of face tilt angle to the tooth of thread groove bottom land, make and be applied to normal force that the screw pair surface of contact produces and be far longer than locking pressure between screw pair, and the frictional force that produces also increases greatly, the cusp on the outside thread tooth top on bolt or the screw rod is when meshing with 30 ° of wedge shape inclined-planes simultaneously, outside thread sound of baby talk point is yielding, so that load is even, when having avoided in the prior art regular screw threads engagement, the total load more than 80% all concentrates on the phenomenon on first, second pitch thread face.Compared with the prior art, one of beneficial effect that has, shock-proof check reliable performance, stable, tensile strength is high, can guarantee to use safety; Two, use simply, convenient, do not need to add in addition spring washer, lock washer and just can reach anti-loosing effect; Three, can repeatedly install and remove, reuse, increase the service life; Four, can reduce assembly cost, improve efficiency of assembling; Five, quality testing is simple and convenient, only get final product with two detections of slope of thread go-no go gauge; Six, using scope is wide, applicable to the assembling of highi degree of accuracy fastening piece in the various industries.

Description of drawings

Fig. 1 is the embodiment's sectional view that ends loose nut described in the utility model.

Fig. 2 is the A section enlarged view of Fig. 1.

Fig. 3 is the stereochemical structure sectional view of Fig. 1.

Fig. 4 is the application examples three-dimensional cutaway view that loose nut cooperates with bolt that ends described in the utility model.

Fig. 5 is the application examples section plan that loose nut cooperates with bolt that ends described in the utility model.

Among the figure: 1. nut body, 11. interior threaded holes, 111. thread grooves, 1111. teeth are nibbled face; 2. bolt, 21. outside thread teeth, 211. cusps.

Embodiment

In order to make the public can fully understand technical spirit of the present utility model and beneficial effect; the claimant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but the claimant is not restriction to technological scheme to embodiment's description, anyly makes form and immaterial variation all should be considered as protection domain of the present utility model according to the utility model design.

See also Fig. 1, Fig. 2 and Fig. 3, the utility model is a kind of to end loose nut, comprises nut body 1, and the structure of nut body 1 is unrestricted, is preferably in the present embodiment hexagon nut.Axial centre at described nut body 1 offers interior threaded hole 11, be furnished with a plurality of thread grooves 111 between equably on the inwall of described interior threaded hole 11, be characterized in: the bottom surface of each thread groove 111 bottom land namely be used for bolt or screw rod on the inconsistent tooth of outside thread tooth to nibble face 1111 be one to be the wedge shape inclined-plane of 30 ° of angles with the longitudinal center line direction of interior threaded hole 11.Described thread groove 111 can be processed by the screw tap that matches with thread slot cross-section shape, and is detected by the gauge that matches with thread slot cross-section shape.

See also Fig. 4 and Fig. 5, in a concrete application examples of the present utility model, what be used for cooperating with described nut body 1 is a bolt 2, described bolt 2 places the interior threaded hole 11 of described nut body 1, and the screw pair that forms of the outside thread tooth by on the bolt 2 21 and thread groove 111 on the described interior threaded hole 11 is realized screwing between the two.The utility model is the wedge shape inclined-plane of 30 ° of angles owing to being formed with one at the bottom land of thread groove 111 with the longitudinal center line direction of interior threaded hole 11, when the cusp 211 of outside thread tooth 21 tooth tops and the tooth of thread groove 111 bottom lands are nibbled face 1111 and are contacted, cusp 211 just withstands on 30 ° of wedge shape inclined-planes tightly, produce a very large and equally distributed coupling mechanism force, effectively play locking effect.

In sum, the technological scheme that the utility model provides has overcome the shortcoming in the prior art, has reached goal of the invention, has embodied the described technique effect of claimant

Claims

1. A kind ofly end loose nut, comprise nut body (1), offer interior threaded hole (11) in the axial centre of described nut body (1), be furnished with a plurality of thread grooves (111) between equably on the inwall of described interior threaded hole (11), it is characterized in that: each thread groove (111) bottom land be used for bolt or screw rod on the inconsistent tooth of outside thread tooth to nibble face (1111) be one to be the wedge shape inclined-plane of 30 ° of angles with the longitudinal center line direction of interior threaded hole (11)