CN205478791U

CN205478791U - Bolt and nut component

Info

Publication number: CN205478791U
Application number: CN201520830622.7U
Authority: CN
Inventors: 王绪明; 张泳泽
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2015-10-23
Filing date: 2015-10-23
Publication date: 2016-08-17
Anticipated expiration: 2025-10-23

Abstract

The utility model discloses a bolt and nut component, the screw thread of the screw bolt and nut in this subassembly are round tapered thread, round tapered thread radial helix such as be at the big or the most minimum round of radius or a plurality of circle, the head of bolt, its shape is top and bottom table area imbalance and is close to the terrace with edge that last surface area is littleer of bolt tip. The utility model discloses this kind of structure can reduce the weight of bolt, especially can reduce the use of material after the bolt head and nut are close to the adduction of bolt tip to make the utilization of material more reasonable, and bolt effect short more is obvious more, the gap on every ring of radius of fillet is utilized to the possibility that this kind of screw thread was installed and removed in addition fast, just can pull down the nut after the rotation is than the conventional screw thread number of turns still less.

Description

Screw bolt and nut assembly

Technical field

This utility model relates to a kind of taper thread screw bolt and nut assembly.

Background technology

Common bolt and nut is cylindrical thread bolt and nut, and the pulling force born in its shank of bolt bears the closer to end Pulling force the least, and the biggest the closer to the stress in the shank of bolt at nut and the joint portion of pad.In the middle of this shank of bolt The pulling force born in part bar is equally distributed.It will be apparent that some material of bolt end wastes, Ke Yilve Micro-reduction some.

Summary of the invention

Technical problem to be solved in the utility model is: provide a kind of taper thread screw bolt and nut assembly, with gram Take the problem that traditional cylindrical bolt and nut exists.

This utility model solves its technical problem and the technical scheme is that the screw bolt and nut in this assembly, its screw thread For taper thread.

Described taper thread, it is at the helix that the maximum or minimum circle of radius or some circles such as are at the radiuses.

Described bolt, the radius of its screw thread is the helix with the change of bolt length dimension linear.

The head of described bolt, it is shaped as upper and lower surface and amasss the upper surface area of unequal and close bolt end more Little terrace with edge, this terrace with edge can be six terrace with edges.

Described nut, its shape is terrace with edge, and this terrace with edge can be six terrace with edges.

This utility model compared with prior art has the advantage that

In Space Science and Technology, the requirement to bolt weight is close to harshness, and staff can be by the length of each bolt and spiral shell Within mother is accurate to 1mm, for the weight reducing rocket exactly.This bolt can reduce the weight of bolt, because at bolt Head and nut can reduce the use of material after receiving in bolt end, and make the utilization of material more reasonable.And And the shortest bolt effect is the most obvious.This screw thread also has the probability of rapid-assembling/disassembling, utilizes and often encloses the gap on radius of fillet, Just nut can be pulled down after the number of turns that speed ratio normal thread is less.

Accompanying drawing explanation

Fig. 1 is the structural representation of nut.

Fig. 2 is the structural representation of bolt.

The force analysis schematic diagram that Fig. 3 is is the bolt of radius such as grade with the circle that a kind of tapered thread radius is maximum.

In figure: 1. nut；2. screw thread；3. bolt thread；4. shank of bolt；5. bolt head；6. screw position line；7. outside screw thread Edge line；8. boost line；9. force analysis line.

Detailed description of the invention

Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail.

The screw bolt and nut assembly that this utility model provides, is a kind of tapered thread screw bolt and nut assembly, see Fig. 1 and Fig. 2, wherein: the screw thread 2 in nut 1 is taper thread.Bolt is made up of shank of bolt 4 and bolt head 5, in this shank of bolt 4 Bolt thread 3 is taper thread.

Described shank of bolt 4, the first lap of its bolt thread 3 or last lap, i.e. radius maximum or the one of radius minimum Circle or some circles are manufactured into the helix waiting radius, and after thus solving bolt locking, once loosening can quickly coming off i.e. is prone to The problem loosened.

Described bolt, the radius of its screw thread is the helix with the change of bolt length dimension linear, thus can improve The stressing conditions of screw thread on screw rod and screw rod, makes distribution of force more reasonable, reaches to save material and alleviates the purpose of screw rod weight.

Described bolt head, it is shaped as upper and lower surface and amasss unequal and less near the upper surface area of bolt end Terrace with edge, this terrace with edge is six terrace with edges.So can save a whole set of material used by bolt, alleviate the gross weight of a whole set of bolt.

Described taper thread the radius such as can be at the maximum or minimum circle of radius or some circles, the most permissible Reaching the purpose of locking self-locking, alternative scheme is to use spring shim.

Described nut, its shape is six terrace with edges, and it just can be pulled down after rotating less number of turns from bolt.

This utility model has plurality of advantages, and with a kind of taper thread radius maximum encloses the bolt for waiting radius below Force analysis as a example by.In Fig. 3, numbering 6-9 is screw position line, threaded outer edge line, boost line, force analysis line respectively.

According to force analysis (Fig. 3) it can be seen that

Owing to the screw thread of unit length provides uniform pulling force to screw rod, so the inside screw the closer to lower section bears more Many pulling force, in screw rod vertically and non-uniform Distribution, the pulling force at lower section B point is bigger much than the pulling force at A point for power.Institute Need not be uniformly distributed with the diameter at threaded screw portion screw rod, be upwards gradually reduced the demand that just can meet intensity. And if draw the reverse extending line of the stress of thread root, just can find out that the power that tapered thread is provided is to be pointing directly at Inside screw.Cylindrical thread is the most different, and the pulling force of the be supplied to screw rod of cylindrical thread is all the outer surface by screw rod, only There is the inside that can be delivered to screw rod by the micro-deformation of screw rod.So saying from the angle of force analysis, tapered thread was both Improve the utilization ratio of bolt material, improve again the force-bearing situation of screw rod local.

Nut also exists same problem, by same principle, changes the shape of nut, just can change nut material Utilization ratio, thus reach to alleviate the purpose of whole bolt weight.In innovative point thirdly namely, the shape of nut is one Individual six terrace with edges.

And such screw thread design can cause screw thread the most loose, so the method solved is exactly that radius of fillet is maximum or minimum One circle or a few circle be wait radius, so bolt have small loosening when because this enclose screw thread pitch ratio be minimum, So small deformation can be produced by maximum pressure, thus reaches the purpose of self-locking.Screw thread is enclosed without this, then Need exist for spring shim to coordinate, here it is aforesaid alternative scheme.

Double dot dash line is a boost line 8, finds out from this boost line, and nut is the most permissible after rotating less number of turns From screw rod, pull down that (what Fig. 3 drew is the screw thread of 8 circles, rotates 4 circles and just can pull down, if a minimum circle such as is at the radius, revolves equally Turn 4 circles just can pull down.Practical situation may be different, but be this appearance in form).

Claims

1. a screw bolt and nut assembly, it is characterised in that the screw bolt and nut in this assembly, its screw thread is taper thread；Institute The taper thread stated is at the helix that the maximum or minimum circle of radius or some circles such as are at the radiuses；The head of described bolt Portion, it is shaped as upper and lower surface and amasss the terrace with edge that unequal and near bolt end upper surface area is less.

Screw bolt and nut assembly the most according to claim 1, it is characterised in that described bolt, the radius of its screw thread be with The helix of bolt length dimension linear change.

Screw bolt and nut assembly the most according to claim 1, it is characterised in that described terrace with edge is six terrace with edges.

Screw bolt and nut assembly the most according to claim 1, it is characterised in that the shape of described nut is terrace with edge.

Screw bolt and nut assembly the most according to claim 1, it is characterised in that the shape of described nut is six terrace with edges.