CN216666202U

CN216666202U - Switch type pawl locknut

Info

Publication number: CN216666202U
Application number: CN202220292362.2U
Authority: CN
Inventors: 孙悦
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-25
Filing date: 2022-02-15
Publication date: 2022-06-03
Anticipated expiration: 2032-02-15

Abstract

The utility model discloses a switch type pawl anti-loose nut which mainly comprises a nut body, a pawl, an elastic piece, a key cavity and a blocking piece. The anti-loosening device is provided with a pawl and an elastic piece, the pawl in the anti-loosening device is tightly attached to the thread of the bolt under the action of the elastic piece, when the nut rotates in the screwing direction, the pawl slides along the surface of the thread of the bolt, and when the nut rotates in the unscrewing direction, the pawl rotates along the shaft under the action of friction force and is reliably self-locked; the stop piece prevents the anti-loosening device from axially falling out. When the nut is disassembled, the nut can be smoothly unscrewed only by inserting the key into the key cavity beside the pawl and forcing the pawl to be separated from the bolt thread. Compared with the nut in the prior art, the nut has the advantages that the nut is reliable and loose-proof, and meanwhile, the function of randomly loosening is added. The utility model has simple structure, can be matched with a universal bolt, has low manufacturing cost and convenient use, and can be applied to most occasions.

Description

Switch type pawl locknut

Technical Field

The utility model belongs to the technical field of mechanical fasteners, and particularly relates to a switch type pawl locknut.

Background

Generally, the bolt and the nut cannot be loosened under the action of static load, but under the action of impact, vibration or variable load, the connection is possible to loosen, the work is influenced, and even accidents occur. In order to ensure the connection to be safe and reliable, effective anti-loosening measures must be taken for the connection of the bolt and the nut.

The common nut anti-loosening modes at present can be divided into four types, namely friction anti-loosening, permanent anti-loosening, mechanical anti-loosening and structural anti-loosening. The utility model belongs to the field of mechanical anti-loosening, but is different from the common mechanical anti-loosening which directly limits the relative rotation of a locknut and a bolt by using a stop piece, such as a slotted nut matched with a cotter pin, a serial steel wire, a stop washer and the like; because the nut stop piece has no pretightening force, the anti-loosening stop piece only acts when the nut is loosened to the stop position, therefore, the mode of locking the nut is not anti-loosening but avoids parts from falling off; the other three anti-loosening modes also have the problems of poor anti-loosening effect, difficulty in disassembly and the like; the prior other technologies also have the problems of complex structure, poor market effect and the like.

Disclosure of Invention

The utility model aims to solve the defects of the prior art and provide a nut which can be unscrewed at will and is convenient to disassemble on the premise of reliable looseness prevention. In order to achieve the purpose, the utility model designs a switch type pawl anti-loose nut which mainly comprises a nut body (1), pawls (2), an elastic piece (3) and a key cavity (4); the pawl (2) consists of a pawl claw (2-1) and a pawl shaft (2-2); the anti-loosening device is arranged in the nut body (1) and comprises a pawl (2) and an elastic piece (3); a key cavity (4) is arranged beside the anti-loosening device, and a key is inserted into the key cavity (4) to enable the nut to be in a rotatable and loose state.

Furthermore, the pawl (2) is formed by fixing a pawl claw (2-1) and a pawl shaft (2-2) together; the nut is characterized in that a hole for accommodating the pawl shaft (2-2) is formed in the nut body (1), a space for ensuring the pawl claw (2-1) to rotate along the pawl shaft (2-2) is formed between the hole and the nut thread, the width of the joint of the space and the hole of the pawl shaft (2-2) is smaller than the diameter of the pawl shaft (2-2), a space for accommodating the elastic piece (3) is formed in one side of the space in the nut loosening direction, and the pawl (2) and the elastic piece (3) are placed in the hole and the space.

Furthermore, the elastic piece (3) is positioned on one side of the nut loosening direction of the pawl claw (2-1), and the elastic piece (3) is fixedly connected to the pawl claw (2-1) or fixedly connected to the nut body (1).

Further, the key cavity (4) is positioned on one side of the nut screwing direction of the pawl claw (2-1), and comprises a space on one side of the nut screwing direction of the pawl claw (2-1) in a locking state and also comprises a space swept by the pawl claw (2-1) when rotating from the locking state to be separated from the thread of the bolt.

Furthermore, a stopper (5) for preventing the anti-loosening device from coming off along the axial direction is arranged on one side of the nut body (1), and the stopper (5) is fixed on the end face of the nut body (1) on the side where the anti-loosening device is located; the blocking piece (5) is provided with a hole at the corresponding position of the key cavity (4).

Furthermore, the pawl claw (2-1) faces the nut loosening direction, and an included angle A between an action line OM of the pawl claw (2) and a common normal line of a point M is smaller than or equal to a friction angle between two materials, namely the pawl claw (2-1) and a bolt thread, in an initial state.

Furthermore, the anti-loosening device and the key cavity (4) thereof are provided with one to six groups according to requirements.

Compared with the prior art, the utility model has the beneficial effects that: the anti-loosening nut is simple in structure, the anti-loosening of the nut is realized through the matching of the pawl and the elastic piece, and the nut can be loosened by extruding the pawl by the key to enable the pawl to rotate towards the loosening direction until the pawl is separated from the contact with the bolt thread; the locknut manufactured according to the scheme of the utility model can prevent the nut from being drawn back and reversed under any condition under the condition of non-human factors, is suitable for bolts with threads of any specification like common nuts in the market, is convenient to mount as common nuts, and can be in a loosening state only by inserting a key during dismounting.

Drawings

FIG. 1 is an assembly schematic view of the present switch-type ratchet locknut;

FIG. 2 is a schematic structural view of the switch type ratchet locknut;

FIG. 3 is a sectional view A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a three-dimensional view of the pawl;

fig. 6 is a three-dimensional view of the key.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

As shown in fig. 1 and 2, the switch-type pawl locknut mainly comprises a nut body (1), a pawl (2), an elastic piece (3), a key cavity (4) and a stopper (5), wherein the stopper (5) is a part in a preferred scheme; as shown in fig. 5, the pawl (2) comprises a pawl claw (2-1) and a pawl shaft (2-2), the pawl claw (2-1) can be a trapezoid, the pawl shaft (2-2) can be a cylinder, and the pawl claw (2) and the pawl shaft are welded to obtain the pawl (2); the anti-loosening device is arranged in the nut body (1) and comprises a pawl (2) and an elastic piece (3), wherein the elastic piece (3) is positioned on one side of the pawl (2) in the nut loosening direction; a key cavity (4) is formed in one side of the screwing direction of the nut of the pawl claw (2-1), the key cavity (4) comprises a space in one side of the screwing direction of the nut of the pawl claw (2-1) in a locking state and also comprises a space swept by the pawl claw (2-1) when the pawl claw rotates from the locking state to be separated from the thread of the bolt; fig. 6 is a schematic view of the key, which may be wedge-shaped, and the nut may be brought into a unscrewable state by inserting the key into the key cavity (4); preferably, the stopper (5) is a part for preventing the anti-loose device from coming off along the axial direction, and can be a thin steel plate with the same outer contour and size as the nut body (1), the inner contour is a circle, the inner diameter of the stopper (5) is ensured to be sleeved on a matched bolt, a hole corresponding to the key cavity (4) is milled on the stopper (5), and the hole ensures that the pawl claw (2-1) can rotate along the nut unscrewing direction to be separated from the bolt thread when a key is inserted into the nut in a locking state; if the side end face of the anti-loosening device of the nut body (1) faces the fastened face, the fastened piece can play a role similar to the blocking piece (5), the blocking piece (5) is not needed at the moment, a hole in the position corresponding to the key cavity (4) is milled in the other end face of the nut body (1), and the hole ensures that the pawl claw (2-1) can rotate to be separated from the bolt thread along the nut unscrewing direction when a key is inserted into the nut in the locking state of the nut.

As shown in fig. 3 and 4, a hole of the pawl shaft (2-2) is drilled in the angular top of the universal hexagonal nut along the axial direction, the hole diameter D of the hole is slightly larger than the diameter D of the pawl shaft (2-2), and the hole depth of the hole is slightly larger than the length of the pawl shaft (2-2); a space which can enable the pawl claw (2-1) to rotate along the pawl shaft (2-2) from an initial action state M point to a final state N point is milled from a hole of the pawl shaft (2-2) to a nut thread (the pawl does not reach the final state every time when working); the width B of the joint of the space for accommodating the pawl claw (2-1) and the hole of the pawl shaft (2-2) is less than the diameter d of the pawl shaft (2-2) so as to prevent the pawl shaft (2-2) from being disengaged in the radial direction; the thickness E of the pawl claw (2-1) is smaller than the width B of the joint, so that the pawl claw (2) is not limited in rotation; respectively milling a space capable of accommodating an elastic part (3) and a key cavity (4) at two sides of the space for accommodating the pawl claw (2-1), wherein the space for accommodating the elastic part (3) is positioned at one side of the screwing-unscrewing direction of the space for accommodating the pawl claw (2-1), the key cavity (4) is positioned at one side of the screwing-screwing direction of the space for accommodating the pawl claw (2-1), then placing the anti-loosening device into the working position of the anti-loosening device, and welding a blocking piece (5) on the end surface of the nut body (1) at the side of the anti-loosening device (as shown in figure 2); the elastic piece (3) can be directly fixed on the pawl claw (2-1) or fixed on the nut body (1); the elastic piece (3) is selected according to the size of the nut, and can be selected from a spring, an elastic sheet, an elastic strip or rubber and the like; the anti-loosening device consisting of the pawl (2) and the elastic piece (3) and the corresponding key cavity (4) can be provided with one to six groups according to requirements.

As shown in fig. 4, the pawl claw (2-1) faces to the loosening direction of the nut, and the included angle between the action line OM of the pawl (2) and the common normal line of the point M in the initial state is less than or equal to the friction angle between the two materials of the pawl claw (2-1) and the bolt thread so as to ensure the self-locking property of the pawl claw; the pawl claw (2-1) is tightly attached to the thread of the bolt under the action of the elastic piece (3), when the nut rotates towards the screwing direction, the pawl claw (2-1) slides along the surface of the thread of the bolt, and when the nut rotates towards the unscrewing direction, the pawl claw (2-1) rotates along the pawl shaft (2-2) under the action of friction force and can be reliably self-locked to prevent the nut from unscrewing; the hardness of the pawl claw (2-1) is greater than that of the matched bolt thread, so that the pawl claw (2-1) can be cut into the bolt thread to achieve deep self-locking when necessary; when the nut needs to be loosened, a key is only required to be inserted into the key cavity (4), and the pawl (2) is forced to be separated from the bolt thread, so that the nut can be smoothly loosened.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A switch type pawl anti-loose nut is characterized by comprising a nut body (1), a pawl (2), an elastic piece (3) and a key cavity (4); the pawl (2) consists of a pawl claw (2-1) and a pawl shaft (2-2); the anti-loosening device is arranged in the nut body (1) and comprises a pawl (2) and an elastic piece (3); a key cavity (4) is arranged beside the anti-loosening device, and a key is inserted into the key cavity (4) to enable the nut to be in a rotatable and loose state.

2. The on-off ratchet locknut of claim 1, wherein: the pawl (2) is formed by fixing a pawl claw (2-1) and a pawl shaft (2-2) together; the nut is characterized in that a hole for accommodating the pawl shaft (2-2) is formed in the nut body (1), a space for ensuring the pawl claw (2-1) to rotate along the pawl shaft (2-2) is formed between the hole and the nut thread, the width of the joint of the space and the hole of the pawl shaft (2-2) is smaller than the diameter of the pawl shaft (2-2), a space for accommodating the elastic piece (3) is formed in one side of the space in the nut loosening direction, and the pawl (2) and the elastic piece (3) are placed in the hole and the space.

3. The on-off ratchet locknut of claim 1, wherein: the elastic piece (3) is located on one side of the ratchet pawl claw (2-1) in the nut loosening direction, and the elastic piece (3) is fixedly connected to the ratchet pawl claw (2-1) or fixedly connected to the nut body (1).

4. The on-off ratchet locknut of claim 1, wherein: the key cavity (4) is positioned on one side of the screwing direction of the nut of the pawl claw (2-1), comprises a space on one side of the screwing direction of the nut of the pawl claw (2-1) in a locking state, and also comprises a space swept by the pawl claw (2-1) when rotating from the locking state to be separated from the thread of the bolt.

5. The on-off ratchet locknut of claim 1, wherein: a stopper (5) for preventing the anti-loosening device from coming off along the axial direction is arranged on one side of the nut body (1), and the stopper (5) is fixed on the end face of the nut body (1) on the side where the anti-loosening device is located; the blocking piece (5) is provided with a hole at the corresponding position of the key cavity (4).

6. The on-off ratchet locknut of claim 1, wherein: the pawl claw (2-1) faces the nut unscrewing direction, and the included angle A between the action line OM of the pawl claw (2) and the common normal line of the M point is smaller than or equal to the friction angle between the two materials of the pawl claw (2-1) and the bolt thread in the initial state.

7. The on-off ratchet locknut of claim 1, wherein: the anti-loosening device and the key cavity (4) thereof are provided with one to six groups according to requirements.