CN203532477U

CN203532477U - Eccentric type self-locking locknut

Info

Publication number: CN203532477U
Application number: CN201320630765.4U
Authority: CN
Inventors: 黄龙梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-10-12
Filing date: 2013-10-12
Publication date: 2014-04-09
Anticipated expiration: 2023-10-12

Abstract

The utility model relates to an eccentric type self-locking locknut which comprises a nut body with a main threaded hole. The eccentric type self-locking locknut is characterized in that the eccentric type self-locking locknut further comprises a self-locking sleeve with a self-locking threaded hole, an eccentric boss is arranged on the upper end face of the nut body, an eccentric distance is formed between the central axis of the eccentric boss and the central axis of the main threaded hole, an eccentric check hole arranged on the eccentric boss in a sleeved mode is formed in the lower end face of the self-locking sleeve, and the central axis of the eccentric check hole coincides with the central axis of the eccentric boss. Under the initial state that the self-locking sleeve is arranged on the eccentric boss, the central axis of the self-locking threaded hole coincides with the central axis of the main threaded hole, a clearance is reserved between the upper end face of the eccentric boss and the top wall of the eccentric check hole, and under the state that the self-locking sleeve deviates for an angle relative to the eccentric boss, the central axis of the self-locking threaded hole deviates from the central axis of the main threaded hole. Self locking can be carried out simply by screwing the self-locking sleeve tightly, and unlocking can be carried out simply by rotating the self-locking sleeve reversely, and the eccentric type self-locking locknut is convenient to demount and can be used repeatedly.

Description

Eccentric self locking anti-loose nut

Technical field

The utility model relates to a kind of fastening piece that is threaded for machinery, relates in particular to a kind of eccentric self locking anti-loose nut, and this loosens nut and is particularly suitable for the often environment being threaded in strenuous vibration.

Background technique

It is locking with axial force fastening means that the fastening piece that is threaded is often referred to plain bolt nut, makes standard universal part, and owing to being subject to the impact of operating conditions environment, often fastening nut easily becomes flexible, exits and cause fastening inefficacy, and serious meeting causes security incident.Along with the development of technology, it is more and more higher that all trades and professions double thread connects the locking requirement of fastening piece, mainly contains following several at present to the locking mode of nut:

1, rub locking.This mode is most widely used a kind of locking mode, and this mode produces a positive pressure not changing with external force between screw pair, to produce one, can stop screw pair frictional force in relative rotation.This positive pressure can be by axially or simultaneously two realizing to collet threaded pair.As adopt elastic washer, double nut, self-locking nut and nylon inserts locking nut etc.This nut anti-looseness mode is more convenient for the dismounting of nut, but in the situation of shock and vibration and varying load, bolt can decline because of the lax pretightening force that causes at the beginning, along with the increase of vibration number, the pretightening force of loss increases lentamente, finally will cause that nut gets loose, scyewed joint lost efficacy.

2, mechanical nut anti-looseness.This mode is directly to limit relatively rotating of screw pair with retainer.As adopt cotter pin, series winding steel wire and lock washer etc.This mode causes dismounting inconvenient.

3, riveting is rushed locking.After tightening, adopt and rush point, welding, the method such as bonding, make screw pair lose kinematic pair characteristic and be connected to become non-disconnectable connection.The shortcoming of this mode is that tightening latch can only be used once, and dismounting is very difficult, must destroy bolt pair and can dismantle.

Aforementioned nut anti-loose structure respectively has pluses and minuses, but synthesise various factor also needs to be further improved.

Summary of the invention

Technical problem to be solved in the utility model is that a kind of locking reliable, rational in infrastructure, convenient disassembly reusable eccentric self locking anti-loose nut are provided for above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above adopted technological scheme: a kind of eccentric self locking anti-loose nut, comprise the nut body with main thread hole, it is characterized in that: also comprise have self-locking thread hole from lock tube, the upper-end surface of described nut main body has upwardly extending eccentric boss, the medial axis in the medial axis of this bias boss and described main thread hole has an eccentric distance, the described lower end surface from lock tube has the bias being set on eccentric boss and stops hole, this bias stops the medial axis in hole and the medial axis of eccentric boss overlaps, between the inner circle wall in eccentric only hole and eccentric boss periphery wall, there is frictional force, in self-locking, be set under the original state of eccentric boss, the medial axis in self-locking thread hole overlaps with the medial axis in main thread hole, the upper-end surface of eccentric boss and eccentric stopping between the roof of hole have gap simultaneously, under the state from an angle of the relatively eccentric boss deflection of lock tube, the medial axis in described self-locking thread hole and the medial axis in main thread hole are offset.

As improvement, in the upper-end surface of above-mentioned eccentric boss and eccentric gap of stopping between the roof of hole, be provided with flexible gaskets.When lock tube rotates compression, flexible gaskets will be compressed between lock tube and nut main body and be out of shape like this, produces as the anti-loosing effect that loosens packing ring, further prevents becoming flexible when self-locking is enclosed within locking state.

The periphery of above-mentioned eccentric boss has annular groove, in this annular groove, is embedded with seal ring, and the periphery of seal ring contacts with the eccentric only inner circle wall in hole.By seal ring and the eccentric only rubbing contact of the inner circle wall in hole, make from relative fixed under original state between lock tube and nut main body.Certainly also can realize with the eccentric only close-fitting of the inner circle wall in hole by the periphery of eccentric boss.

Compared with prior art, the utility model has the advantage of: due under original state, main thread hole, the medial axis of self-locking thread hole and connecting bolt is on equal same axis, at this moment nut main body screws in connecting bolt together with just can be synchronously from lock tube, when needs self-locking, only needing will be from the relative nut main body of lock tube along screwing angle of nut main body direction rotation, now from the medial axis in self-locking thread hole and the medial axis in main thread hole of lock tube, be offset, under eccentric effect, the outside thread of the relative connecting bolt in self-locking thread hole that self-locking puts produces larger radial force in engagement place, according to the principle of active force and reaction force, the outside thread of the relative connecting bolt in main thread hole of nut body also produces larger radial reaction force in engagement place, under the effect of two radial forces, make from lock tube and connecting bolt firmly locked, this self-lock force strengthens with the angle of rotating relative to nut body from lock tube, self-lock force is just larger, anti-loosing effect is better, only need rotate backward from lock tube during release in addition, convenient disassembly is also reusable.

Accompanying drawing explanation

Fig. 1 is the utility model embodiment's structure sectional view;

Fig. 2 is the utility model embodiment's use phase diagram (original state);

Fig. 3 is the utility model embodiment's use phase diagram (self-locking state).

Embodiment

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

As shown in Figure 1, be a preferred embodiment of the present utility model.

A kind of eccentric self locking anti-loose nut, comprise the nut body 1 with main thread hole 11, and have self-locking thread hole 21 from lock tube 2, the upper-end surface of nut main body 1 has upwardly extending eccentric boss 12, the medial axis 3 of this bias boss 12 has an eccentric distance e with the medial axis 4 in main thread hole 11, from the lower end surface of lock tube 2, there is the bias being set on eccentric boss 12 and stop hole 22, self-locking thread hole 21 is positioned at the eccentric only top in hole 22, on lock tube 2, shoulder hole is being set, the aperture portion of shoulder hole is self-locking thread hole 21, the macropore portion of shoulder hole is eccentric only hole 22.

The eccentric only medial axis 5 in hole 22 and the medial axis 3 of eccentric boss 12 overlap, between the inner circle wall in eccentric only hole 22 and eccentric boss 12 periphery walls, there is frictional force, from lock tube 2, be arranged under the original state of eccentric boss 12, the medial axis 6 in self-locking thread hole 21 overlaps with the medial axis 4 in main thread hole 11, the upper-end surface of eccentric boss 12 and eccentric stopping between 22 roofs of hole have gap x simultaneously, under the state from an angle of relatively eccentric boss 12 deflections of lock tube 2, the medial axis 6 in self-locking thread hole 21 is offset with the medial axis 4 in main thread hole 11.

In the upper-end surface of eccentric boss 12 and the eccentric gap x stopping between 22 roofs of hole, be provided with flexible gaskets 7.

The periphery of eccentric boss 12 has annular groove 13, in this annular groove 13, is embedded with seal ring 8, and the periphery of seal ring 8 contacts with the eccentric only inner circle wall in hole 22.

As shown in Figure 2, due under original state, main thread hole 11, the medial axis of self-locking thread hole 21 and connecting bolt 9 is on equal same axis, at this moment nut main body 1 screws in connecting bolt 9 together with just can be synchronously from lock tube 2, when needs self-locking, as shown in Figure 3, only needing will be from the relative nut main body 1 of lock tube 2 along screwing angle of nut main body 1 direction rotation, now from the medial axis 6 in the self-locking thread hole 21 of lock tube 2, be offset with the medial axis 4 in main thread hole 11, under eccentric effect, the outside thread of the self-locking thread hole 21 relative connecting bolts 9 on lock tube 2 produces larger radial force in engagement place, according to the principle of active force and reaction force, the outside thread of the main thread hole 11 relative connecting bolts 9 of nut body also produces larger radial reaction force in engagement place, under the effect of two radial forces, make from lock tube 2 and connecting bolt 9 firmly locked, this self-lock force strengthens with the angle of rotating relative to nut body 1 from lock tube 2, self-lock force is just larger, anti-loosing effect is better, only need rotate backward from lock tube 2 during release in addition, convenient disassembly is also reusable.

Claims

1. an eccentric self locking anti-loose nut, comprise the nut body (1) with main thread hole (11), it is characterized in that: also comprise have self-locking thread hole (21) from lock tube (2), the upper-end surface of described nut main body (1) has upwardly extending eccentric boss (12), the medial axis (3) of this bias boss (12) has an eccentric distance (e) with the medial axis (4) in described main thread hole (11), the described lower end surface from lock tube (2) has the bias being set on eccentric boss (12) and stops hole (22), this bias stops the medial axis (5) of hole (22) and the medial axis (3) of eccentric boss (12) overlaps, between the inner circle wall in eccentric only hole (22) and eccentric boss (12) periphery wall, there is frictional force, from lock tube (2), be arranged under the original state of eccentric boss (12), the medial axis (6) in described self-locking thread hole (21) overlaps with the medial axis (4) of main thread hole (11), the upper-end surface of eccentric boss (12) and eccentric stopping between the roof of hole (22) have gap (x) simultaneously, under the state from an angle of the relatively eccentric boss of lock tube (2) (12) deflection, the medial axis (6) in described self-locking thread hole (21) is offset with the medial axis (4) in main thread hole (11).

2. eccentric self locking anti-loose nut according to claim 1, is characterized in that: in the upper-end surface of described eccentric boss (12) and eccentric gap (x) of stopping between the roof of hole (22), be provided with flexible gaskets (7).

3. eccentric self locking anti-loose nut according to claim 1, it is characterized in that: the periphery of described eccentric boss (12) has annular groove (13), in this annular groove (13), be embedded with seal ring (8), the periphery of seal ring (8) contacts with the eccentric only inner circle wall in hole (22).