CN211820309U

CN211820309U - Anti-loosening bolt

Info

Publication number: CN211820309U
Application number: CN201922033750.XU
Authority: CN
Inventors: 郭大林; 朱咸仕
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-10-30
Anticipated expiration: 2029-11-22

Abstract

The utility model discloses a check bolt, including bolt, nut, the bolt includes head and screw rod, be equipped with connecting thread and fixed screw thread on the screw rod, the connecting piece passes through connecting thread and bolt threaded connection, the nut passes through fixed screw thread and bolt threaded connection. The utility model has the advantages of, it utilizes the screw thread between bolt and the connecting piece and the screw thread opposite direction between bolt and the nut, and the direction when the bolt pine takes off is for screwing up for the nut to form the effect of screwing up mutually, reach the locking purpose of bolt. The structure of the traditional bolt is improved, so that the possibility of loosening is theoretically avoided, and the reliability is better; the screw has the advantages of few component parts, more convenient screwing and disassembling, lower cost and wider application range.

Description

Anti-loosening bolt

Technical Field

The utility model relates to a machine parts technical field specifically indicates a check bolt.

Background

As shown in fig. 5. At present, the locking method of threaded connection adopts the double nut locking that the utility model patent publication is CN 109838445A more to be published, and the utility model patent publication's that the publication number is CN 109519461A three nuts locking, and its rationale is that a plurality of nuts are to the back of screwing up in opposite directions, and the thread side receives axial pressure opposite direction in the screw thread pair that a plurality of nuts and bolt are constituteed to eliminate the axial clearance between the screw thread pair, increase friction torque reaches the effect of locking stopping.

The existing patent technology improves a common bolt to a certain extent to form a double-nut bolt and a triple-nut bolt, and improves the anti-loosening performance of the structure by increasing the friction torque between thread pairs. However, the number of nuts of the existing anti-loosening bolt is increased, the structure is complex, multiple assembling and disassembling are needed, the problem is complex, meanwhile, the friction torque between the thread pairs is only increased in the principle of the existing patent, and the bolt still has the possibility of loosening theoretically.

Disclosure of Invention

The utility model aims to solve the problems, and provides a check bolt which improves the structure of the traditional bolt, theoretically has no possibility of loosening and has better reliability; the screw has the advantages of few component parts, more convenient screwing and disassembling, lower cost and wider application range.

In order to achieve the purpose, the utility model relates to a check bolt, including bolt, nut, the bolt includes head and screw rod, be equipped with connecting thread and fixed thread on the screw rod, the connecting piece passes through connecting thread and bolt threaded connection, the nut passes through fixed thread and bolt threaded connection.

Further, the connecting thread and the fixing thread are opposite in thread direction. Therefore, the direction of the bolt is the screwing direction relative to the nut when the bolt is loosened, so that the mutual screwing effect is formed, and the purpose of preventing the bolt from loosening is achieved.

Further, the connecting thread is a right-hand thread, and the fixing thread is a left-hand thread. Therefore, the direction of the bolt is the screwing direction relative to the nut when the bolt is loosened, so that the mutual screwing effect is formed, and the purpose of preventing the bolt from loosening is achieved.

Further, the head is a regular hexagonal prism. Therefore, when the bolt is installed, the bolt and the connecting piece can be installed and fixed conveniently by using a traditional tool.

Further, the nut is also a regular hexagonal prism. Therefore, when the nut is installed, the nut and the bolt can be installed and fixed conveniently by using a traditional tool.

Further, the head is the same external dimensions as the nut. Therefore, when the nut and the bolt are installed and fixed, the nut and the bolt are convenient to use a traditional tool.

Further, it is characterized in that: the inner diameter of the screw rod in the connecting thread section is larger than the outer diameter of the screw rod in the fixed thread section. Therefore, the bolt and the connecting piece are conveniently installed, and then the nut is installed.

Further, the length of the connecting threaded section screw is greater than that of the fixing threaded section screw. Therefore, the whole using part of the bolt is longer, and the connecting effect is better.

Further, the length of the connecting threaded section screw is the same as the width of the connecting piece. Thus, when in use, the bolt is matched with the connecting piece, and the connecting piece is just arranged on the connecting thread section of the bolt completely.

Further, interference fit is carried out between the head and the connecting piece and between the connecting piece and the nut. Like this, during the use, better cooperation between bolt, connecting piece, the nut for whole connection is more firm.

The utility model has the advantages of, it utilizes the screw thread between bolt and the connecting piece and the screw thread opposite direction between bolt and the nut, and the direction when the bolt pine takes off is for screwing up for the nut to form the effect of screwing up mutually, reach the locking purpose of bolt. The structure of the traditional bolt is improved, so that the possibility of loosening is theoretically avoided, and the reliability is better; the screw has the advantages of few component parts, more convenient screwing and disassembling, lower cost and wider application range.

Drawings

FIG. 1 is a schematic view of the usage state of the present invention;

FIG. 2 is a schematic view of the utility model after being unscrewed;

FIG. 3 is a schematic structural view of the present invention during tightening;

FIG. 4 is a schematic view of the internal structure of the utility model when screwing down;

fig. 5 is a schematic diagram of a prior art structure mentioned in the background art.

In the figure: a bolt 1 (wherein, the head part 1.1, a screw rod 1.2, a connecting thread 1a and a fixing thread 1b), a nut 2 and a connecting piece 3.

Detailed Description

The invention will be described in further detail with reference to the following figures and specific embodiments:

the anti-loosening bolt shown in fig. 1-4 comprises a bolt 1 and a nut 2, wherein the bolt 1 comprises a head 1.1 and a screw 1.2, the screw 1.2 is provided with a connecting thread 1a and a fixing thread 1b, the connecting piece 3 is in threaded connection with the bolt 1 through the connecting thread 1a, and the nut 2 is in threaded connection with the bolt 1 through the fixing thread 1 b. The connecting thread 1a and the fixing thread 1b are opposite in thread direction. The connecting thread 1a is a right-handed thread, and the fixing thread 1b is a left-handed thread. The head 1.1 is a regular hexagonal prism. The nut 2 is also a regular hexagonal prism. The head 1.1 has the same outer dimensions as the nut 2. The inner diameter of the section of the screw rod 1.2 of the connecting thread 1a is larger than the outer diameter of the section of the screw rod 1.2 of the fixing thread 1 b. The length of the section of the screw rod 1.2 of the connecting thread 1a is greater than that of the section of the screw rod 1.2 of the fixing thread 1 b. The length of the section of the screw rod 1.2 of the connecting thread 1a is the same as the width of the connecting piece 3. The head part 1.1 is in interference fit with the connecting piece 3, and the connecting piece 3 is in interference fit with the nut 2.

The utility model discloses when in actual use:

the shank 1.2 of the bolt 1 is partially formed by two opposite threads, wherein the inner diameter of the connecting thread 1a is greater than the outer diameter of the fastening thread 1 b. The connecting thread 1a on the bolt 1 is in threaded connection with the connecting piece 3, the length of the connecting thread 1a is smaller than or equal to that of the connecting piece 3, and the fixing thread 1b on the bolt 1 is in threaded connection with the nut 2.

The connecting thread 1a between the screw rod 1.2 and the connecting piece 3 and the fixed thread 1b between the screw rod 1.2 and the nut 2 are opposite in direction (the right-handed fixed thread 1b of the connecting thread 1a is left-handed or the left-handed fixed thread 1b of the connecting thread 1a is right-handed), the screw rod 1.2 is connected with the connecting piece 3 through the connecting thread 1a, and the screw rod 1.2 is connected with the nut 2 through the fixed thread 1 b.

The utility model discloses when screwing up, at first screw up bolt 1 and connecting piece 3, then screw up nut 2 and bolt 1. Assuming that the nut 2 is stationary, when the bolt 1 is loosened, it is oriented in a counter-clockwise direction, when viewed from the point of tightening the nut 2, and assuming that the bolt 1 is stationary, the nut 2 will be rotated and tightened in a counter-clockwise direction. The direction when bolt 1 loosens is for screwing up for nut 2 to form the effect of screwing up each other, reach whole locking purpose.

The utility model changes the structure of the traditional bolt, which has no possibility of loosening in theory and has better reliability; the number of components is small, and the screwing and the dismounting are more convenient; compared with the prior art, the cost is lower, and the application range is wider.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should be considered as belonging to the protection scope of the present invention.

Claims

1. A check bolt for fixing a connecting member (3), characterized in that: the bolt comprises a bolt (1) and a nut (2), wherein the bolt (1) comprises a head (1.1) and a screw (1.2), the screw (1.2) is provided with a connecting thread (1a) and a fixing thread (1b), the connecting piece (3) is in threaded connection with the bolt (1) through the connecting thread (1a), and the nut (2) is in threaded connection with the bolt (1) through the fixing thread (1 b);

the head (1.1) has the same outer dimensions as the nut (2);

the length of the screw rod (1.2) of the connecting thread (1a) section is the same as the width of the connecting piece (3);

the head (1.1) is in interference fit with the connecting piece (3), and the connecting piece (3) is in interference fit with the nut (2).

2. A check bolt as defined in claim 1, wherein: the connecting thread (1a) and the fixing thread (1b) are opposite in thread direction.

3. A check bolt as defined in claim 2, wherein: the connecting thread (1a) is a right-handed thread, and the fixing thread (1b) is a left-handed thread.

4. A check bolt as defined in claim 3, wherein: the head (1.1) is a regular hexagonal prism.

5. A check bolt according to claim 4, wherein: the nut (2) is also a regular hexagonal prism.

6. A check bolt according to any one of claims 1 to 5, wherein: the inner diameter of the screw (1.2) at the section of the connecting thread (1a) is larger than the outer diameter of the screw (1.2) at the section of the fixed thread (1 b).

7. A check bolt according to claim 6, wherein: the length of the screw rod (1.2) at the section of the connecting thread (1a) is greater than that of the screw rod (1.2) at the section of the fixed thread (1 b).