CN210889673U

CN210889673U - Staggered teeth type combined locknut

Info

Publication number: CN210889673U
Application number: CN201922001384.XU
Authority: CN
Inventors: 杜旭升
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-06-30
Anticipated expiration: 2029-11-19

Abstract

The utility model relates to a malposition formula combination locknut, including upper nut and lower nut, be provided with on the upper nut with first internal thread of screw rod spiro union, internal diameter be greater than first internal screw thread second internal thread, be provided with on the lower nut with the third internal thread of screw rod spiro union, with the external screw thread of second internal thread looks spiro union. The top surface of the lower nut is provided with an annular convex part, and the external thread is arranged on the outer side wall of the convex part. The device has simple structure and good anti-loosening effect.

Description

Staggered teeth type combined locknut

Technical Field

The utility model relates to a fastener field especially relates to a malposition formula combination locknut.

Background

Locknuts, self-tightening nuts, are a common type of fastening locknut. Such as the eccentric nut of japan, down nut, and chinese autumnal nut.

The following six modes are mainly adopted:

1. a flattened washer refers to a part that is cushioned between the connected piece and the nut. The metal ring, which is generally flat, protects the surface of the connected component from scratching by the nut and distributes the pressure of the nut against the connected component.

2. The spring washer has the advantages of low cost, convenient installation and suitability for frequently assembling and disassembling parts. But the spring washer has a low anti-loosening capacity.

3. The self-locking nut is invented for preventing the self-locking nut from being loosened automatically due to vibration and other reasons in the using process of a common nut, such as vibration. The self-locking nut mainly has the functions of looseness prevention and vibration resistance. Used in special occasions. The working principle is generally self-locking by friction force. The self-locking nut is classified according to functions and comprises a nylon ring embedded, a neck-closing device and a metal anti-loosening device. They all belong to the effective torque type locknuts.

4. The nut anti-loosening liquid is smeared at the bolt tightening position and then the nut is screwed, so that the anti-loosening effect can be achieved.

5. Double nuts (left-handed and right-handed) are anti-loose, and are screwed tightly and anti-loose through the matching of a left-handed nut and a right-handed nut.

6. The screw and nut are drilled and fixed by adding pins, and in machinery, the pins are mainly used for assembly positioning and can also be used for overload shearing connection in a connection and release level safety device. The pin types are: cylindrical pins, conical pins, holed pins, cotter pins, shear pins, etc.

Above for current locking connected mode commonly used, some have locking effect poor, some exist inconvenient to use, some have problems such as processing cost height, consequently need develop the locking connecting fastener of better usefulness, satisfy customer's demand.

Disclosure of Invention

In view of the above, there is a need for a cross-teeth type combination locknut with simple structure and strong anti-loosening effect.

In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a staggered teeth formula combination locknut, includes upper nut and lower nut, be provided with on the upper nut with the first internal thread of screw rod spiro union, the internal diameter is greater than the second internal thread of first internal thread, be provided with on the lower nut with the third internal thread of screw rod spiro union, with the external screw thread of second internal thread looks spiro union.

Further, the top surface of the lower nut is provided with an annular convex part, and the external thread is arranged on the outer side wall of the convex part.

Further, a gap exists between the top surface of the lower nut and the bottom surface of the upper nut.

Furthermore, a washer is arranged between the upper nut and the lower nut.

Furthermore, a first end face gear is arranged on the bottom surface of the upper nut, and a second end face gear with the gear tooth orientation opposite to that of the first end face gear is arranged on the top surface of the lower nut.

Furthermore, a third face gear meshed with the first face gear is arranged on the top surface of the gasket, and a fourth face gear meshed with the second face gear is arranged on the bottom surface of the gasket.

Compared with the prior art, the utility model discloses following beneficial effect has: this device changes current locknut structure, and upper and lower nut all with the screw rod spiro union in, the upper nut still the spiro union on the lower nut, because the pitch difference between first internal thread and the second internal thread is big than first internal thread pitch when screwing up the upper nut second internal thread pitch, has a power of upwards pulling the lower nut to make the pulling force of lower nut to the screw rod bigger. A clamping force is formed between the upper nut and the lower nut relative to the screw rod, the second internal threads have certain taper, and an inward clamping force is formed when the upper nut is screwed down, so that the clamping force and the friction force of the nut to the screw rod are larger. The pretightening force of the nut cannot change when the compact vibrates or undergoes cold shrinkage deformation.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a perspective view of an embodiment of the present invention.

Fig. 2 is an assembly diagram of an embodiment of the present invention.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

In the figure: 1-screw, 2-compact, 3-lower nut, 31-second face gear, 32-third internal thread, 33-external thread, 4-upper nut, 41-first face gear, 42-first internal thread, 43-second internal thread.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1-3, a staggered-teeth type combined locknut comprises an upper nut 4 and a lower nut 3, wherein a first internal thread 42 screwed with a screw rod 1 and a second internal thread 43 with an inner diameter larger than that of the first internal thread 42 are arranged on the upper nut 4, a third internal thread 32 screwed with the screw rod 1 is arranged on the lower nut 3, an annular convex part is arranged on the top surface of the lower nut 3, and an external thread 33 screwed with the second internal thread 43 is arranged on the outer side wall of the convex part.

In this embodiment, the bottom surface of the upper nut 4 is provided with a first face gear 41, and the top surface of the lower nut 3 is provided with a second face gear 41 with teeth facing the opposite direction of the first face gear 41. A washer is arranged between the first face gear 41 and the second face gear 31, a third face gear engaged with the first face gear is arranged on the top face of the washer, and a fourth face gear engaged with the second face gear is arranged on the bottom face of the washer.

In this embodiment, both the upper nut 4 and the lower nut 3 have the same direction of rotation as the screw, and the direction of rotation between the upper nut and the lower nut is the same as or opposite to the direction of rotation between the nut and the screw.

In this embodiment, the screw 1 has a parameter of M28 × 2mm, the first internal thread 42 has a parameter of M28 × 2mm, the second internal thread 43 has a parameter of M36 × 2.2.2 mm, the third internal thread 32 has a parameter of M28 × 2mm, the external thread 33 has a parameter of M36 × 2.2.2 mm, and the difference in pitch of 0.2 is not constant and is determined by the tolerance of the thread clearance between the screw and the nut, the amount of cold and heat deformation of the material, and the like

When the nut is used, the upper nut 4 and the lower nut 3 are firstly screwed to the positions with the marks to be aligned, then the two nuts are simultaneously screwed to the screw rod 1 to screw the compact 2, and then the upper nut is screwed. Because the pitch difference between the first internal thread and the second internal thread is larger than the pitch of the first internal thread when the upper nut is screwed down, a force for pulling the lower nut upwards is generated, so that the pulling force of the lower nut on the screw rod is larger. A clamping force is formed between the upper nut and the lower nut relative to the screw rod, the second internal threads have certain taper, and an inward clamping force is formed when the upper nut is screwed down, so that the clamping force and the friction force of the nut to the screw rod are larger. The pretightening force of the nut cannot change when the compact vibrates or undergoes cold shrinkage deformation. After the two nuts are screwed, because the opposite end surfaces of the upper nut and the lower nut are provided with the face gears, the insert block or a special washer with the face gears can be embedded between the two nuts, so that the upper nut and the lower nut cannot rotate in vibration, and the nuts can never loosen.

When no compact object exists in the nut, the upper nut and the lower nut are screwed in opposite directions, so that the nut can be clamped on the screw rod and is not easy to loosen. When the nut is loosened, the upper nut needs to be loosened to the marked position and then the upper nut and the lower nut need to be loosened simultaneously.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a malposition formula combination locknut which characterized in that: the screw rod screwing device comprises an upper nut and a lower nut, wherein a first internal thread screwed with a screw rod and a second internal thread with the inner diameter larger than the first internal thread are arranged on the upper nut, and a third internal thread screwed with the screw rod and an external thread screwed with the second internal thread are arranged on the lower nut.

2. The malposed combination locknut of claim 1, wherein: the top surface of the lower nut is provided with an annular convex part, and the external thread is arranged on the outer side wall of the convex part.

3. The malposed combination locknut of claim 2, wherein: and a gap is formed between the top surface of the lower nut and the bottom surface of the upper nut.

4. The malted combination locknut of any one of claims 1-3, wherein: and a washer is arranged between the upper nut and the lower nut.

5. The malposed combination locknut of claim 4, wherein: a first end face gear is arranged on the bottom face of the upper nut, and a second end face gear with the direction of gear teeth opposite to that of the first end face gear is arranged on the top face of the lower nut.

6. The malposed combination locknut of claim 5, wherein: and a third face gear meshed with the first face gear is arranged on the top surface of the gasket, and a fourth face gear meshed with the second face gear is arranged on the bottom surface of the gasket.