CN212272791U

CN212272791U - Gradual change formula threaded connection is vice

Info

Publication number: CN212272791U
Application number: CN202020520671.1U
Authority: CN
Inventors: 王浩凌; 曹武
Original assignee: Hunan Shenyi Machinery Application Research Institute Co ltd
Current assignee: Hunan Shenyi Machinery Application Research Institute Co ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-01-01
Anticipated expiration: 2030-04-10

Abstract

The utility model discloses a gradual change type threaded connection pair, which belongs to the technical field of fasteners and comprises a bolt and a locking nut, wherein the locking nut is matched with the bolt so as to lock a workpiece to be connected, an internal thread is arranged on the locking nut, and the thread pitch on the internal thread is gradually reduced towards the direction away from the workpiece to be connected; the bolt is provided with external threads, the thread pitch of each external thread is the same, the thread pitch on the locking nut at the position farthest away from the workpiece to be connected is the same as the thread pitch on the bolt, and the problem that the stress balance of an existing threaded connection pair is poor is solved.

Description

Gradual change formula threaded connection is vice

Technical Field

The utility model relates to a fastener technical field, in particular to gradual change formula threaded connection is vice.

Background

Each high-strength bolt connecting pair comprises a bolt, a nut and two washers, and is produced in the same batch and is a product processed in the same heat treatment process. According to the installation characteristics, the high-strength bolt connection pair can be divided into a large hexagon bolt and a torsional shear type bolt.

In the process of assembling the high-strength bolt connecting pair, a bolt needs to sequentially penetrate through a plurality of workpieces to be connected, a washer is sleeved after the bolt penetrates through the workpieces, and a nut is screwed, so that the workpieces to be connected are locked together. The existing bolt and nut are used together, and the external thread on the bolt and the internal thread in the nut are matched in thread pitch, major diameter, intermediate diameter, minor diameter and other parts.

However, the working principle of the nut is that the friction force between the nut and the bolt is adopted for self-locking, the nut and the bolt with the threads arranged in the equidistant mode have the same interaction force between the meshing threads at all positions of the nut and the bolt, and the force cannot be transmitted backwards well, so that the stress of each thread is extremely unbalanced, about 90% of the force is borne by the thread closest to the workpiece to be connected, the phenomenon of thread slipping is easy to occur, and the service life is short.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gradual change formula threaded connection is vice, it has solved the vice relatively poor problem of atress equilibrium of current threaded connection.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a gradual change type threaded connection pair comprises a bolt and a locking nut, wherein the locking nut is matched with the bolt to lock a workpiece to be connected, an internal thread is arranged on the locking nut, and the thread pitch on the internal thread is gradually reduced towards the direction far away from the workpiece to be connected;

the bolt is provided with an external thread, the thread pitch of each external thread is the same, and the thread pitch of the locking nut at the position farthest away from the workpiece to be connected is the same as the thread pitch of the bolt.

Adopt above-mentioned structure, lock nut adopts the design of pitch gradual change formula, and the pitch of thread of bolt keeps unchangeable, and so, the interact power between lock nut and the bolt meshing screw will grow gradually, and the gradual transmission of the power of being convenient for has balanced lock nut's the thread atress condition, reduces the thread and slides the silk phenomenon, and lock nut screws up the in-process also more laborsaving convenience simultaneously, has reduced material cost.

The method is further optimized as follows: the number of the threads on the locking nut is not less than three.

By adopting the structure, the number of the threads is too much, the installation is troublesome, the number of the threads is too small, and the locking effect cannot be ensured.

The method is further optimized as follows: the difference of the adjacent thread pitches on the internal thread is not more than 0.1 mm.

By adopting the structure, if the thread pitch is too large, most of force is born by the thread which is farthest away from the workpiece to be connected, so that the force is not balanced conveniently.

The method is further optimized as follows: the locking nut comprises a nut body and a first washer, and the first washer is connected to the nut body and located between the workpiece to be connected and the nut body.

Adopt above-mentioned structure, the setting of first packing ring is in order to distinguish lock nut positive and negative on the one hand, and the error appears when preventing lock nut equipment, and on the other hand can play and support tightly and guard action, improves lock nut and treats the compactness between the work piece of being connected, reduces wearing and tearing.

The method is further optimized as follows: the nut body is close to one side of the workpiece to be connected is provided with a circle of mounting groove, the first gasket is provided with a circle of protrusion, and the protrusion is embedded in the mounting groove.

By adopting the structure, the connectivity between the nut body and the first gasket is improved.

The method is further optimized as follows: the nut body is provided with a center hole penetrating through two ends of the nut body, the internal thread is arranged in the center hole, the mounting groove and the bulge are arranged around the center hole, and the center of the mounting groove and the center of the bulge are both located in the axial direction of the center hole.

Adopt above-mentioned structure, improved joint strength and wholeness between nut body and the first packing ring.

The method is further optimized as follows: the mounting groove is T type groove, it is protruding that the arch is T type, protruding with mounting groove sliding fit.

Adopt above-mentioned structure, prevent first packing ring roll-off mounting groove.

The method is further optimized as follows: and a second gasket is arranged between the bolt and the workpiece to be connected, and the second gasket is tightly abutted between the bolt and the workpiece to be connected.

By adopting the structure, when the nut body is screwed down in a rotating manner, the first gasket does not need to rotate along with the nut body, and the damage to the workpiece to be connected is reduced.

To sum up, the utility model discloses following beneficial effect has: the locking nut is designed in a thread pitch gradual change mode, and the thread pitch of the bolt is kept unchanged, so that the interaction force between the locking nut and the bolt meshing threads is gradually increased, the force is gradually transmitted conveniently, the thread stress condition of the locking nut is balanced, the thread slipping phenomenon is reduced, meanwhile, the locking nut is more labor-saving and convenient to tighten, and the material cost is reduced.

Drawings

FIG. 1 is a schematic structural view of an embodiment, which is mainly used for embodying a mounting structure of a threaded connection pair;

FIG. 2 is a schematic structural diagram of an embodiment, which is mainly used for embodying the structure of a lock nut;

fig. 3 is a schematic sectional view of the embodiment, mainly for embodying the mounting structure of the first gasket.

In the figure, 1, bolt; 2. locking the nut; 21. a nut body; 22. a first gasket; 23. a central bore; 24. an internal thread; 25. a protrusion; 3. workpieces to be connected; 4. a second gasket; 5. and (4) external threads.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b): a gradual change type threaded connection pair is shown in figures 1-3 and comprises a bolt 1 and a locking nut 2. The bolt 1 comprises a rod part and a head part fixed at one end of the rod part, a second gasket 4 is arranged between the head part of the bolt 1 and the workpiece 3 to be connected, and the second gasket 4 is tightly abutted between the head part of the bolt 1 and the workpiece 3 to be connected. The locking nut 2 is matched with the bolt 1 so that the workpiece 3 to be connected is locked, an internal thread 24 is arranged on the locking nut 2, and the thread pitch of the internal thread 24 is gradually reduced towards the direction far away from the workpiece 3 to be connected. Specifically, the lock nut 2 includes a nut body 21 and a first washer 22, a central hole 23 is formed in the nut body 21 and penetrates through two ends of the nut body 21, and an internal thread 24 is disposed in the central hole 23.

Referring to fig. 1 to 3, the internal thread 24 of the lock nut 2 is of a gradual design, i.e., the pitch of the internal thread 24 decreases the further away from the workpiece 3 to be joined. In order to play a good locking role and prevent the locking nut 2 from loosening, specifically, the number of the threads on the locking nut 2 is not less than three, generally about 4-8, and the threads are too many to be fixed, which is troublesome, and too few cannot ensure the locking effect. Adjacent pitches on the internal thread 24 differ by no more than 0.1 mm. The bolt 1 is provided with an external thread 5, the external thread 5 is arranged on the rod part of the bolt 1, and the number of threads on the bolt 1 is more than that on the locking nut 2. Each pitch on the bolt 1 is the same, and preferably, the pitch on the lock nut 2 farthest from the workpiece 3 to be joined is the same as the pitch on the bolt 1.

Referring to fig. 1 to 3, a first washer 22 is attached to the nut body 21 between the workpiece 3 to be attached and the nut body 21. The first gasket 22 and the first gasket 22 may be metal gaskets, or may be gaskets made of other materials such as rubber gaskets. The nut body 21 is provided with a circle of mounting groove on one side close to the workpiece 3 to be connected, the first gasket 22 is provided with a circle of protrusions 25, and the protrusions 25 are embedded in the mounting groove. The mounting groove and the bulge 25 are arranged around the center hole 23, and the circle centers of the mounting groove and the bulge 25 are located on the axial direction of the center hole 23. The mounting groove is T type groove, and arch 25 is T type arch, and arch 25 and mounting groove sliding fit.

To lock nut 2, the screw thread atress that is close to treating to connect work piece 3 more will be big more, and 90% power about all is born by the screw thread that is closest to treating to connect work piece 3, consequently for balanced lock nut 2's screw thread atress condition, reduces the screw thread phenomenon of slipping, the utility model discloses a lock nut 2 adopts the design of screw thread pitch gradual change formula, and bolt 1's screw thread pitch keeps unchangeable, so, makes the interact power between lock nut 2 and the bolt 1 meshing thread grow gradually, and the transmission of the power of being convenient for, lock nut 2 screws up the in-process simultaneously also more laborsaving convenience, has reduced material cost.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides a gradual change formula threaded connection is vice, includes bolt (1) and lock nut (2), lock nut (2) with bolt (1) cooperation to make work piece (3) locking to be connected, characterized by: an internal thread (24) is arranged on the locking nut (2), and the thread pitch on the internal thread (24) is gradually reduced towards the direction far away from the workpiece (3) to be connected;

be provided with external screw thread (5) on bolt (1), every thread pitch on external screw thread (5) is all the same, the distance treat connecting workpiece (3) farthest place the thread pitch on lock nut (2) with the thread pitch on bolt (1) is the same.

2. A tapered threaded connection as defined in claim 1 wherein: the number of the threads on the locking nut (2) is not less than three.

3. A tapered threaded connection as defined in claim 1 wherein: the difference of the adjacent thread pitches on the internal thread (24) is not more than 0.1 mm.

4. A tapered threaded connection as defined in claim 1 wherein: the lock nut (2) comprises a nut body (21) and a first washer (22), wherein the first washer (22) is connected to the nut body (21) and is located between the workpiece (3) to be connected and the nut body (21).

5. A tapered threaded connection as defined in claim 4 wherein: the nut body (21) is close to one side of the workpiece (3) to be connected, a circle of mounting groove is formed in the side, a circle of protrusions (25) are arranged on the first gasket (22), and the protrusions (25) are embedded in the mounting groove.

6. A tapered threaded connection as defined in claim 5 wherein: the nut is characterized in that a center hole (23) penetrating through two ends of the nut body (21) is formed in the nut body (21), internal threads (24) are arranged in the center hole (23), the mounting groove and the protrusions (25) are arranged around the center hole (23), and the center of the mounting groove and the centers of the protrusions (25) are located in the axial direction of the center hole (23).

7. A tapered threaded connection as defined in claim 5 wherein: the mounting groove is T type groove, it is protruding that arch (25) are T type, protruding (25) with mounting groove sliding fit.

8. A tapered threaded connection as defined in claim 1 wherein: a second gasket (4) is arranged between the bolt (1) and the workpiece (3) to be connected, and the second gasket (4) is tightly abutted between the bolt (1) and the workpiece (3) to be connected.