CN86204074U

CN86204074U - Locknut

Info

Publication number: CN86204074U
Application number: CN 86204074
Authority: CN
Inventors: 吴宰成
Original assignee: Ningbo Jiangbei Xinxing Machinery Works; Industrial Bureau Of Jiangbei District Ningbo
Current assignee: Ningbo Jiangbei Xinxing Machinery Works; Industrial Bureau Of Jiangbei District Ningbo
Priority date: 1986-09-08
Filing date: 1986-09-08
Publication date: 1987-07-22

Abstract

The utility model discloses a locknut which belongs to a screw thread connecting piece. The locknut has good fastening performance, high durability and easy installation. Even if the locknut is disassembled many times, the screw thread is not damaged. The locknut comprises a convex shape lower nut which has eccentricity and taper, and a concave shape upper nut which has the eccentricity and the taper. When the upper and lower nut are screwed, the peripheral faces are contacted with each other, and the end faces are contacted with each other at the same time; the two eccentricity hindering points are provided for preventing the nuts from loosening, so the good fastening performance can be realized. The locknut can be used for various anti-loosing parts and can be in particular suitable for intense shock and impact parts, such as railway, locomotive, mine, quay, internal-combustion engines, pile driver, engineering machine, etc.

Description

Locknut

The utility model is the thread connector lock nut.

Lax phenomenon will appear connecting in thread connector under impulsive load and varying load, therefore the various locking measures of normal employing in machine-building at present.

See that on product sample of Japan a kind of lock nut is made up of convex lower nut that has eccentric and tapering and the matrix upper cap nut that has tapering, when side face contacted, end face contacted simultaneously.This nut check power is very big, so the more domestic original locking device of anti-loosing effect all will get well, through repeatedly dismantling also easy damaged not of screw thread.But it does not have eccentric to hinder point, so the locking degree varies with each individual and overexerts and can damage nut during fastening nut.

Now to design a kind of fastening better effects if, easy for installation, dismounting easily, even dismantle the lock nut that tens times screw threads also can not damage.

The utility model produces this lock nut according to the principle of relevant mechanics, cottering on the basis of Japanese lock nut.It is made up of convex lower nut that has eccentric and tapering and the matrix upper cap nut that has eccentric and tapering, and when screwing two nut side faces contacts up and down, end face contacts simultaneously, and has two off-centre that stop nut loosening to hinder points.

Carried out the seriation design according to producing actual needs.Tapering, offset, the recessed degree of depth of protrusion height are according to the design of different size nut up and down, and tapering is within 12 °～20 °, and the lower nut offset is five times of upper cap nut offset.The recessed degree of depth and protrusion height are in 3～7 millimeters scopes.

Two eccentric hinder point be located at apart from eccentric summit (apart from thread center farthest a bit be called eccentric summit) angle that staggers is identical with the ratio of pitch with 360 ° ratio and screw-thread fit tolerance.

This nut can be made into the bolt of selling on the pitch of all size, different shape, NBS or non-NBS and the market and all can be used.

Advantage of the present utility model:

1, anti-loosing effect is good, powerful inherent coupling mechanism force is arranged when screwing nut, and is bigger tens times than general nut, therefore can bear judder and impact.

Although it is two nuts when 2, installing, as long as just can screw with a wrench, needn't resemble will be with two wrench to revolving the double-deck nut.

Even 3 nuts stop in the middle of the screw rod, when screwing upper cap nut, lower nut can not become flexible yet.

When 4, screwing nut, because two eccentric points that hinder are arranged, locked position is constant, and is symmetrically stressed, do not damage screw thread, therefore installs and removes tens screw threads and also can not damage.

With reference to the accompanying drawings the utility model is described in further detail.

Fig. 1 upper cap nut sectional view

Fig. 2 upper cap nut plan view

Fig. 3 lower nut sectional view

Fig. 4 lower nut plan view

Fig. 5 is the sectional view during nut screwing clamping up and down

A among Fig. 2 ₁Be the offset of upper cap nut, K ₁Be the obstruction point of upper cap nut, a among Fig. 4 ₂Be the offset of lower nut, K ₂Be the obstruction point of lower nut, the h among Fig. 1 ₁Be the recessed degree of depth, h among Fig. 3 ₂Be protrusion height, h ₁＞h ₂

Earlier the convex lower nut is screwed in the bolt referring to Fig. 5, and then the upper cap nut of screw-in matrix makes the conical surface that lower nut protrudes combine the side face pressure P with the upper cap nut recess part ₁With P ₂Proportional increase because of two different eccentric conical surfaces all rotate around thread center, will inevitably form obstruction when screwing nut, produce the obstruction point of two correspondences simultaneously.Screw upper cap nut up to the end face that links to each other with lower nut contact be adjacent to till, produced axial locking power P again ₃, at this moment inside has just formed a very big synthetic coupling mechanism force P ₁+ P ₂+ P ₃, both reached maximum fastening effect, can bear external sharp pounding and impact (as shown in the figure) again.

Claims

1, a kind of threaded fastener lock nut, it is made up of convex lower nut that has eccentric and tapering and the matrix upper cap nut that has tapering, two nuts are when its side face contact about tightening, end face contacts simultaneously, it is characterized in that the matrix upper cap nut also has off-centre, and two eccentric points that hinder that stop nut loosening are arranged.

2,, it is characterized in that the lower nut offset is five times of upper cap nut offset according to the lock nut of claim 1.

3,, it is characterized in that the recessed degree of depth of upper cap nut and lower nut protrusion height scope should be within 3～7 millimeters according to the lock nut of claim 1.

4,, it is characterized in that two eccentric hindered point to be located at the angle that staggers apart from eccentric summit identical with the ratio of screw-thread fit tolerance and pitch with 360 ° ratio according to the lock nut of claim 1.