CN201714813U

CN201714813U - Anti-loose internal thread structure

Info

Publication number: CN201714813U
Application number: CN2010202474438U
Authority: CN
Inventors: 孙强; 徐彤
Original assignee: Shanghai Shakes High Nut Co Ltd
Current assignee: Shanghai Shakes High Nut Co Ltd
Priority date: 2010-07-01
Filing date: 2010-07-01
Publication date: 2011-01-19
Anticipated expiration: 2020-07-01

Abstract

The utility model relates to the technical field of fasteners, in particular to an anti-loose internal thread structure, which is characterized in that the position near the middle part on a root surface of an internal thread is bended to form a wedge surface and then is connected with a crest surface to form a wedge-shaped internal thread phatnoma, and the included angle beta of the bending part near the middle part of the root surface is 148-152 degrees. Compared with the prior art, the utility model has simple structure, the wedge-shaped phatnoma is adopted to greatly increase the anti-loose friction force so as to make the product have the functions of loose prevention and drop prevention.

Description

A kind of locking female thread structure

[technical field]

The utility model relates to technical field of fastening, is a kind of locking female thread structure specifically.

[background technique]

Along with expanding economy, the yard craft car industry is more and more important in carrier, owing to be easy to generate strenuous vibration in transit, get loose because of vibrations thereby make fastening piece, therefore be necessary to design a kind of anti-loose fastening piece to be used on the Transport Machinery.

[summary of the invention]

The purpose of this utility model is to overcome the deficiencies in the prior art, designs the locking anti-drop function that a kind of internal thread that is provided with the inclined wedge-shaped alveolus is realized fastening piece.

For achieving the above object, design a kind of locking female thread structure, it is characterized in that: the nearly medium position bending in the tooth bottom surface of internal thread forms the internal thread alveolus that is connected to form inclined wedge-shaped after the cammed surface again with the crest face, angle β=148～152 of nearly middle part, tooth bottom surface bending part °.

The level of described cammed surface bottom deducts level from the cammed surface top to the degree of depth to the degree of depth greater than the 6g tolerance range.

The utility model is compared with prior art, and is simple in structure, adopts the alveolus of inclined wedge-shaped to increase locking frictional force greatly, makes product have locking, anti-drop function.

[description of drawings]

Fig. 1 is the structural representation of the utility model when cooperating with outside thread.

Fig. 2 is the partial enlarged drawing of Fig. 1.

Fig. 3 is the force bearing point partial enlarged drawing of the utility model when cooperating with outside thread.

Referring to Fig. 1-Fig. 2,1 is internal thread; 2 is outside thread; 3 is the tooth bottom surface; 3-1 is a cammed surface; 4 is the crest face.

Referring to Fig. 3, three arrow directions are the force bearing point of internal thread when cooperating with outside thread.

[embodiment]

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

Referring to Fig. 1 and Fig. 2, do not change internal thread 1 tooth bottom surface 3 and the angle of crest face 4 in the initial ingress of outside thread, but the cammed surface 3-1 that 3 nearly medium position places are set as downward bending in original internal thread tooth bottom surface joins with crest face 4 again, thereby internal thread 1 forms the alveolus of inclined wedge-shaped, angle β=148～152 of tooth bottom surface 3 nearly medium position bending parts °.

The level of described cammed surface 3-1 bottom to the degree of depth be radial depth deduct the cammed surface top level to the degree of depth greater than the 6g tolerance range, promptly from the section of whole female thread structure, the cammed surface at its two ends forms " eight " font.

Referring to Fig. 3, owing at the bottom of the tooth of female thread structure of the present utility model a cammed surface 3-1 is arranged, when cooperating with outside thread 2, the force direction that is subjected to that is applied between screw thread changes, make a power identical with clamping force, what produced has just increased with joint efforts greatly, thereby the locking frictional force that produces has also just increased greatly, Here it is the locking root place of internal thread of the present utility model, this internal thread can mate with standard external, without any need for auxiliary locking element, and outside thread can freely be selected into, and can reduce labor intensity when installing and using during use; This screw thread can also be reused, and does not reduce its locking effect.

Claims

1. locking female thread structure, it is characterized in that: the nearly medium position bending in the tooth bottom surface (3) of internal thread forms the internal thread alveolus that is connected to form inclined wedge-shaped after the cammed surface (3-1) again with crest face (4), angle β=148～152 of nearly middle part, tooth bottom surface bending part °.

2. a kind of locking female thread structure as claimed in claim 1 is characterized in that: the level of described cammed surface (3-1) bottom deducts level from the cammed surface top to the degree of depth to the degree of depth greater than the 6g tolerance range.