CN1065911A - Stress loose-proof self-lock nut - Google Patents

Abstract

A kind of utilization produces stress after nut end face and the inner bolt hole variable angle and prevents the fastening piece that gets loose to increase fastening force.Can be operated in the various continuous shakings that are subjected to, the occasion of impact, its screw thread does not have specific (special) requirements, can be as required, make triangle, rectangle, trapezoidal etc., solved both at home and abroad that existing various nuts should not have the self-locking locking functions, can not be independently operated on the problem that occasion is impacted in continuous shaking.

Description

Stress loose-proof self-lock nut

After a kind of the tightening, variable angle produces stress, the not nut that can get loose between end face and the inner bolt hole.

The nut binder bolt is less than or equal to friction angle by its lead angle.Frictional force on the nut on the internal thread surface of contact and internal thread must be more than or equal to making screw rod break away from the power of nut to the reaction force of screw rod, nut just can be fastened on proper functioning on the screw rod, when be connected by nut on the screw rod object suffer continuous shaking and when impacting, the external force that nut is subjected to also changes thereupon, the frictional force of nut and bolt thread contact surface also changes thereupon, will the phenomenon of instantaneous disappearance or minimizing takes place, through behind the certain hour, nut can get loose automatically, getting loose of nut and bolt can produce serious consequence in the work, causes any property loss.These problem various countries are existing unresolved, and people can only adopt certain locking device in nut and being connected of bolt, as install spring washer, double nut, jewel hole additional and wear pin, are with wing packing ring, stopping shim ...Increased cost, workload is made troubles to production.

Task of the present invention provide a kind of can loose-proof self-lock nut, it is tightening the stress of back by producing after the resiliently deformable, and the frictional force of screw thread surface of contact is increased, fastening force increases, and reaches to prevent the purpose that gets loose.

Task of the present invention is finished as follows.Angle α between nut end face and the inner bolt hole is greater than 90 degree, behind the fastening nut, the pulling force of screw thread, with the resistance of work to nut, the angle α of nut end face and inner bolt hole is changed, the stress that produces when angle α diminishes has increased the frictional force of screw thread surface of contact, has dwindled the gap between the screw thread junction, reaches the purpose that prevents that nut from getting loose.The screw thread of loose-proof self-lock nut is partly the same with other nut, can be as required, make triangle, rectangle, trapezoidal etc.

The invention will be further described below in conjunction with accompanying drawing.

With reference to the angle α between 1 end face 1 of nut α among the figure and the inner bolt hole 2 greater than 90 °,

The invention will be further described below in conjunction with accompanying drawing:

With reference to the angle α between nut A end face 1 and the inner bolt hole 2 among the figure greater than 90 °, end face 1 is a conical surface, fastening nut A during work, the mutual active force of internal and external threads pulls to workpiece 3 with nut end face 1, and face 1 moves the resistance that is subjected to workpiece 3 simultaneously, under screw thread and workpiece 3 dual power effects, angle α diminishes, and produces resiliently deformable, the stress F of distortion, make frictional force increase between the screw thread, gap smaller.Face 1 displacement is simultaneously inwardly shunk nut top, clamped bolt, increased fastening force, when suffering the external force of continuous shaking and impact when having prevented nut work effectively, producing screw thread surface of contact frictional force takes place instantaneous, the phenomenon that disappears or reduce, the purpose that can not get loose automatically when having reached nut work.

Angle α between nut end face 1 and the inner bolt hole 2 can be according to the material of nut, the size of required fastening force is selected, after guaranteeing face 1 displacement, angle α is reduced into resiliently deformable, but angle α must can slot at its external diameter for some nut greater than 90 degree, displacement with increase face 1, with the ability of angle α resiliently deformable, end face 1 also can be with tooth, skids to prevent nut.

Loose-proof self-lock nut of the present invention is made simple, and it is safe and convenient to use work, its angle α distortion afterwards stress be hit greater than the suffered continuous shaking of nut external force the time, can solve the problem that nut gets loose automatically effectively.

Domestic and international existing nut is because no self-locking locking functions, when being subjected to continuous shaking and impacting, get loose easily, cause the material property loss, stress loose-proof self-lock nut of the present invention has solved the problems referred to above effectively, even when being subjected to continuous shaking and impacting, also can work effectively, safe in utilization, convenient.

Claims (2)

1, can produce resiliently deformable during stress loose-proof self-lock nut-a kind of work increases fastening force with bolt, prevents the nut that gets loose voluntarily.It is made up of nut α and inner bolt hole 2.Its major character is that the angle α between nut end face 1 and the inner bolt hole 2 spends greater than 90.

2, the time can produce displacement according to the described end face 1 of claim 1 in work, the angle α between itself and the inner bolt hole 2 can only resiliently deformable.

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