Double-conical-surface locknut

Abstract

The utility model belongs to the technical field of locknuts, and discloses a double-conical-surface locknut which comprises a first nut, a second nut, a third nut and a fourth nut. The second nut is arranged below the first nut, a boss is arranged on the outer wall of the upper end of the second nut, and the boss is arranged as the circle center; according to the double-conical-surface locknut, when the locknut is used, the gasket is firstly placed in a bolt, then the second nut is connected to the outer wall of the bolt in a threaded mode, and then the first nut is connected to the outer wall of the bolt in a threaded mode. At the moment, the boss at the upper end of the second nut enters the connecting groove at the lower end of the first nut, when the two nuts are screwed down, due to the eccentric design of the convex nuts, a wedge effect can be generated in the direction perpendicular to the axis of the bolt, which is equivalent to that a wedge is inserted between the nuts, and extra friction force is generated between the nuts and the bolt; therefore, the anti-loosening effect of the nut is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of anti-loosening nuts, in particular to a double-conical anti-loosening nut. Background Art

[0002] Anti-loosening nuts and self-tightening nuts are a common type of fastening anti-loosening nuts, including mechanical anti-loosening, riveting anti-loosening, friction anti-loosening, structural anti-loosening, etc.

[0003] For example, a locking nut assembly with publication number CN211693172U includes a fastening nut and a locking nut, and is characterized in that: one end of the fastening nut is cylindrical and the other end is an outer cone, the bottom area of ​​the outer cone is smaller than that of the cylinder, and the end of the cylinder in contact with the outer cone is provided with an annular plane, and one end of the locking nut is provided with an inner cone-shaped hole that matches the fastening nut, and the outer cone is provided with an expansion groove, and the expansion groove is axially arranged along the screw hole of the fastening nut, and a plurality of protrusions are provided on one end of the inner cone of the locking nut, and a groove that matches the protrusion is provided on the annular plane of the fastening nut, and the protrusion and the groove are interference fit. The utility model provides a locking nut assembly, which transmits the extrusion between the nuts to the screw rod through the setting of the expansion groove, thereby increasing the tightening force, and at the same time, the interference fit between the protrusion and the groove makes the anti-loosening effect better, and the structure is simple;

[0004] This anti-loosening nut improves its anti-loosening effect by combining two nuts. However, since the two nuts are connected by plugging, and then the connected nuts are threadedly connected to the outer wall of the bolt, this structure only splits the nut into two individuals, which are still a single nut after connection. No mechanism is set between the two to improve the anti-loosening effect due to interaction. In order to solve the above problem, a double-conical anti-loosening nut is proposed. Utility Model Content

[0005] The purpose of the utility model is to provide a double-conical anti-loosening nut to solve the above problems, comprising:

[0006] A first nut, wherein a connecting groove is provided at the lower end thereof, and the connecting groove is eccentrically arranged;

[0007] A second nut is arranged below the first nut, wherein an outer wall of an upper end of the second nut is provided with a boss, and the boss is arranged at the center of a circle;

[0008] A washer is arranged below the second nut.

[0009] Through the above technical solution, when using the anti-loosening nut, first put the gasket into the bolt, then thread the second nut to the outer wall of the bolt, and then thread the first nut to the outer wall of the bolt. At this time, the boss at the upper end of the second nut enters the connecting groove at the lower end of the first nut. When the two nuts are tightened, due to the eccentric design of the convex nut, a wedge effect will be generated in the direction perpendicular to the axis of the bolt. This is equivalent to inserting a wedge between the nuts, so that additional friction is generated between the nut and the bolt, thereby improving the anti-loosening effect of the nut.

[0010] In a preferred embodiment, a ratchet is disposed on the lower wall of the second nut, and non-return pawls matching the ratchet are provided on both sides of the upper surface of the gasket.

[0011] Through the above technical solution, when the second nut contacts the gasket, the second nut can only be tightened and cannot be unscrewed during use through the structure of the ratchet and the non-return pawl, thereby improving its tightening effect.

[0012] In a preferred embodiment, the inner walls of the first nut and the second nut are both provided with internal threads.

[0013] In a preferred embodiment, a through hole is provided in the middle of the gasket, and a friction pad is fixedly mounted on the inner wall of the through hole.

[0014] Through the above technical solution, the stability of the gasket and the bolt is improved by fixing the friction pad on the outer wall of the gasket.

[0015] In a preferred embodiment, the outer walls of the first nut and the second nut are both hexagonal structures.

[0016] In a preferred embodiment, the connection groove and the boss have the same taper.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are as follows: the utility model provides a double-conical anti-loosening nut.

[0018] 1. When using anti-loosening nuts, first put the gasket into the bolt, then thread the second nut to the outer wall of the bolt, and then thread the first nut to the outer wall of the bolt. At this time, the boss at the upper end of the second nut enters the connecting groove at the lower end of the first nut. When the two nuts are tightened, due to the eccentric design of the convex nut, a wedge effect will be generated in the direction perpendicular to the axis of the bolt, which is equivalent to inserting a wedge between the nuts, so that additional friction is generated between the nut and the bolt, thereby improving the anti-loosening effect of the nut.

[0019] 2. When the second nut contacts the gasket, the structure of the ratchet and the non-return pawl ensures that the second nut can only be tightened but not unscrewed during use, thereby improving its tightening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the first nut in the utility model;

[0022] Figure 3 It is a structural schematic diagram of the second nut in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the gasket in the utility model.

[0024] Markings in the figure: 1-first nut; 11-connecting groove; 2-second nut; 21-boss; 22-ratchet; 3-washer; 31-check pawl; 32-friction pad. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] The following will be combined Figure 1-4 A double-conical anti-loosening nut according to an embodiment of the utility model is described in detail.

[0027] Example:

[0028] A double-conical anti-loosening nut, comprising:

[0029] The first nut 1 has a connecting groove 11 at its inner lower end, and the connecting groove 11 is eccentrically arranged;

[0030] The second nut 2 is arranged below the first nut 1. The inner walls of the first nut 1 and the second nut 2 are both provided with internal threads. The outer walls of the first nut 1 and the second nut 2 are both hexagonal structures. A boss 21 is arranged on the outer wall of the upper end of the second nut 2. The tapers of the connecting groove 11 and the boss 21 are the same. The boss 21 is arranged at the center of a circle. The second nut 2 is threadedly connected to the outer wall of the bolt, and then the first nut 1 is threadedly connected to the outer wall of the bolt. At this time, the boss 21 at the upper end of the second nut 2 enters the inside of the connecting groove 11 at the lower end of the first nut 1. When the two nuts are tightened, due to the eccentric design of the convex nut, a wedge effect will be generated in the direction perpendicular to the axis of the bolt, which is equivalent to inserting a wedge between the nuts, so that additional friction is generated between the nut and the bolt, thereby improving the anti-loosening effect of the nut;

[0031] The gasket 3 is arranged below the second nut 2, and a ratchet 22 is arranged on the lower wall of the second nut 2. Check pawls 31 adapted to the ratchet 22 are provided on both sides of the upper surface of the gasket 3. When the second nut 2 contacts the gasket 3, the structure of the ratchet 22 and the check pawl 31 can make the second nut 2 only tightened and not unscrewed during use, thereby improving its fastening effect. A through hole is provided in the middle of the gasket 3, and a friction pad 32 is fixedly installed on the inner wall of the through hole. By fixing the friction pad 32 on the outer wall of the gasket 3, the stability of the gasket 3 and the bolt is improved.

[0032] Working principle:

[0033] When using the anti-loosening nut, first put the gasket 3 into the bolt, then thread the second nut 2 to the outer wall of the bolt, and then thread the first nut 1 to the outer wall of the bolt. At this time, the boss 21 at the upper end of the second nut 2 enters the connecting groove 11 at the lower end of the first nut 1. When the two nuts are tightened, due to the eccentric design of the convex nut, a wedge effect will be generated in the direction perpendicular to the axis of the bolt, which is equivalent to inserting a wedge between the nuts, so that additional friction is generated between the nut and the bolt, thereby improving the anti-loosening effect of the nut.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-conical anti-loosening nut, characterized in that: include: A first nut (1), the lower end of which is provided with a connecting groove (11), wherein the connecting groove (11) is eccentrically arranged; A second nut (2) is arranged below the first nut (1), wherein the outer wall of the upper end of the second nut (2) is provided with a boss (21), and the boss (21) is arranged at the center of a circle; A gasket (3) is arranged below the second nut (2).

2. A double-conical locking nut according to claim 1, characterized in that: A ratchet (22) is provided on the lower wall of the second nut (2), and non-return pawls (31) adapted to the ratchet (22) are provided on both sides of the upper surface of the gasket (3).

3. A double-conical locking nut according to claim 1, characterized in that: The inner walls of the first nut (1) and the second nut (2) are both provided with internal threads.

4. A double-conical locking nut according to claim 1, characterized in that: A through hole is provided in the middle of the gasket (3), and a friction pad (32) is fixedly mounted on the inner wall of the through hole.

5. A double-conical locking nut according to claim 1, characterized in that: The outer walls of the first nut (1) and the second nut (2) are both hexagonal structures.

6. A double-conical locking nut according to claim 1, characterized in that: The connecting grooves (11) and (12) have the same taper.

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