CN2572108Y

CN2572108Y - Double locknut utilizing taper surface

Info

Publication number: CN2572108Y
Application number: CN 02256583
Authority: CN
Inventors: 李连进; 王明贤
Original assignee: TIANJIN COLLEGE OF SCIENCE AND ENGINEERING
Current assignee: TIANJIN COLLEGE OF SCIENCE AND ENGINEERING
Priority date: 2002-09-26
Filing date: 2002-09-26
Publication date: 2003-09-10
Anticipated expiration: 2012-09-26

Abstract

The utility model relates to a double locknut utilizing taper surface, which is composed of a nut convex member and a nut concave member. The nut convex member and the nut concave member can be matched in shape, and the match of the nut convex member and the nut concave member is like that the central line of the nut convex member or the central line of the nut concave member is eccentric in shape with the other central line of the screw thread thereof. The inner screw threads of the matched nut convex member and the nut concave member are all arranged on a concentric cylinder surface. The utility model has the advantages that firstly, owing to the wedge surface function caused by tightly screwed upper and lower nuts, the nuts utilizing the design of eccentric center line can generate a force which is axially vertical to a bolt and capable of forcing the bolt to bend and deform a little, as well as can force a screw thread tooth to generate a greater deformation compared with that caused by the axial force except for an axial pretightening force, and the nuts can be prevented from being loosened; secondly, the utility model has artful design, simple structure, convenient manufacture, and good develop prospect.

Description

Utilize the locking double nut of conical surface

(1) technical field:

The utility model relates to a kind of double nut that is used, particularly a kind of locking double nut that utilizes conical surface.

(2) background technique:

Think in theory: the scyewed joint body so that torque T is tightened, as long as the loosening moment of torsion that acts on nut or the bolt head is not more than 0.8T, just can not become flexible.But in fact in external force changes big environment, on the ground of jolting the time, even do not apply loosening moment of torsion, loosening revolution also may take place in nut as vehicle to run.This be because, do the time spent when the scyewed joint body is subjected to external force, on the worm tooth inclined-plane, produce component along radial direction, make nut produce the resilient radial expansion and bolt produces the resilient radial contraction.Therefore, when the external force that the scyewed joint body is subjected to constantly changing is done the time spent, between the contact flank of thread and load supporting surface of screw bolt and nut, radially sliding of trace will be produced.When external force constantly changed, screw bolt and nut carried out repeatedly in the slide relative at screw thread surface of contact place, the loosening revolution that the result of this slide relative accumulation can bring nut.In addition, external force does the time spent, the friction of flank of thread changes to kinetic friction from static friction, and friction factor is diminished gradually, between screw bolt and nut and the connected body and the tendency that all will produce slippage between the connected body.After the external force that changes reached a certain numerical value, loosening revolution will take place in nut.Therefore, in the machinery and building structure under fierce oscillating load effect, the loosening problem of bolted on connection is very serious, also can cause major accident often.

(3) summary of the invention:

The purpose of this utility model is to design a kind of locking double nut that utilizes conical surface, and it efficiently solves above-mentioned trouble under the prerequisite that does not influence the double nut proper functioning.

The technical solution of the utility model: a kind of locking double nut that utilizes conical surface, it is characterized in that it is made up of recessed institute of nut male member and nut, the nut male member is with recessed of nut can cooperate shape, and said nut male member and cooperating of recessed of nut are the center line of recessed of the center line of nut male member or nut and wherein another part thread center line is eccentric shape; The internal thread of the nut male member after matching and recessed of nut is all on a concentric cylndrical surface.

Above-mentioned said nut male member and cooperating of recessed of nut are that in recessed of nut male member or the nut is eccentric shape with the nut center line and can be realized by following two kinds of schemes: promptly (1) is had with the nut center line by the protuberance on the nut male member and is eccentric conical boss shape, and the recess on recessed of the nut has with the nut center line and is concentric circular cone dimple; (2) had with the nut center line by the protuberance on the nut male member and be concentric conical boss shape, the recess on recessed of the nut has with the nut center line and is eccentric circular cone dimple.

Working procedure of the present utility model and working principle are: after in accordance with regulations axial pre tightening force fastening nut recessed (or nut male member) on the bolt, fastening nut male member (or nut recessed) again, at this moment, because two nut tapered portion is eccentric relatively up and down, produces a pair of directed force F vertical with wedge surface on the wedge surface that is in contact with one another _p, bolt is produced and axially vertical bending deflection, this distortion will prevent the loosening of nut.The loosening moment of torsion of this nut helps preventing thread looseness much larger than screw-down torque, is applicable to that vibration environment and external force change connection greatly.By the vibratory impulse experimental standard experiment of U.S. NASA, the anti-time of shaking of common double nut only reaches 30 seconds, and the anti-time of shaking of this novel wedge surface double nut has reached 17 minutes, has illustrated that this structure resistance to vibration is very good.

Superiority of the present utility model is: the nut that 1, utilizes the eccentric design of center line, because the up and down wedge surface effect during nut screwing clamping, except that axial pre tightening force, also will produce a kind of and bolt axis and make bolt that micro-bending deflection take place and make worm tooth produce the bigger distortion that produces than by axial force, prevent the loosening of nut to vertical power; 2, design is ingenious, simple in structure, easy to make, and the excellent development prospect is arranged.

(4) description of drawings:

Accompanying drawing 1 is the related a kind of split structural representation that utilizes the locking double nut of conical surface of the utility model.

Accompanying drawing 2 is the related a kind of overall structure user mode schematic representation that utilizes the locking double nut of conical surface of the utility model.

Wherein: 1 is recessed of nut, and 1a is the circular cone dimple, and 1b is the internal thread of recessed of nut, 1c is recessed center line of nut, and 2 is the nut male member, and 2a is a conical boss, 2b is the internal thread of nut male member, 2c is a nut male member center line, and 3 is bolt, and 4a is last connected body, 4b is following connected body, δ is an offset, and 5a is the fitting surface of conical boss, and 5b is gapped of conical boss.

(5) embodiment:

Embodiment: a kind of locking double nut (seeing Fig. 1,2) that utilizes conical surface, it is characterized in that it is made up of nut male member 2 and recessed 1 on nut, nut male member 2 is with recessed 1 on nut can cooperate shape, and cooperating of recessed 1 on said nut male member 2 and nut is that nut male member 2 has offset δ with nut center line 2c; The internal thread that nut male member 2 after matching and nut are recessed 1 is (see figure 2) on a concentric cylndrical surface all.

Cooperating of recessed 1 on above-mentioned said nut male member 2 and nut is that in recessed 1 on nut male member 2 or the nut one is eccentric shape with the nut center line and can be realized by following scheme: promptly had with nut center line 2c by the protuberance on the nut male member 2 and be eccentric conical boss 2a shape, the recess on recessed 1 on the nut has with nut center line 1c and is concentric circular cone dimple 1a.

Claims

1, a kind of locking double nut that utilizes conical surface, it is characterized in that it is made up of recessed institute of nut male member and nut, the nut male member is with recessed of nut can cooperate shape, and said nut male member and cooperating of recessed of nut are the center line of recessed of the center line of nut male member or nut and wherein another part thread center line is eccentric shape; The internal thread of the nut male member after matching and recessed of nut is all on a concentric cylndrical surface.

2,, it is characterized in that cooperating of recessed of said nut male member and nut being in recessed of nut male member or the nut one and being eccentric shape with the nut center line and can having by the protuberance on the nut male member and be recess on recessed of eccentric conical boss shape and the nut with the nut center line and have and be concentric circular cone dimple with the nut center line and cooperate and form according to the said a kind of locking double nut that utilizes conical surface of claim 1.

3,, it is characterized in that cooperating of recessed of said nut male member and nut being in recessed of nut male member or the nut one and being eccentric shape with the nut center line and can having by the protuberance on the nut male member and be recess on recessed of concentric conical boss shape and the nut with the nut center line and have and be eccentric circular cone dimple with the nut center line and cooperate and form according to the said a kind of locking double nut that utilizes conical surface of claim 1.