CN212377069U

CN212377069U - Anti-loose combined threaded fastener

Info

Publication number: CN212377069U
Application number: CN202021198974.2U
Authority: CN
Inventors: 刘兴丹
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-01-19
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a locking combined threaded fastener, which consists of a bolt and a nut, wherein the bolt is connected with the nut, one of the threads in the bolt or the nut is a standard thread, and the other one is a polygonal thread; the polygonal thread includes: square threads, trapezoidal threads, sawtooth threads, and round threads; the standard thread and the polygonal thread are combined for use, and when the standard thread and the polygonal thread are connected, the edge of the polygonal thread and the inclined surface of the standard thread are in contact with each other and are abutted against each other, and meanwhile, an included angle with a certain angle is formed. Therefore, the wedge-shaped thread locking effect is realized by combining and using threads with different shapes. Through reducing the processing degree of difficulty, production efficiency and yield have been improved.

Description

Anti-loose combined threaded fastener

Technical Field

The utility model relates to a check bolt especially relates to combination screw thread check bolt.

Background

When the existing wedge-shaped thread anti-loosening bolt is connected with a nut, the tooth point of the thread of the bolt tightly props against the wedge-shaped surface of the internal thread of the nut, so that great locking force is generated. The purpose of preventing the bolt from loosening is achieved, the effect is very good, and the bolt is convenient to connect and install. However, the wedge thread has high production precision, large processing difficulty and low yield.

Disclosure of Invention

The anti-loosening combined threaded fastener is used by combining two threads, and is connected with a nut through a bolt, so that the aim of preventing loosening of the bolt is fulfilled.

In order to achieve the above object, the utility model provides a locking combination threaded fastener, include: the bolt is connected with the nut, and one of the threads in the bolt or the nut is a standard thread, while the other is a polygonal thread; the polygonal thread includes: square threads, trapezoidal threads, sawtooth threads, and round threads; the standard thread and the polygonal thread are combined for use, and when the standard thread and the polygonal thread are connected, the edge of the polygonal thread and the inclined surface of the standard thread are in contact with each other and are abutted against each other, and meanwhile, an included angle with a certain angle is formed.

Further, the included angle between the polygonal thread and the standard thread ranges from 1 degree to 90 degrees.

Furthermore, one of the polygonal threads and the standard threads is an external thread, and the other one of the polygonal threads and the standard threads is an internal thread, which are matched with each other for use.

Further, the length of the nut and the number of turns of the thread are increased as required.

In the embodiment of the present invention: through the locking principle of wedge thread, utilize the mode of polygonal square thread with standard screw thread combination, let bolt and nut connection in-process, the contact point between the screw thread is at the end, and the contact surface produces certain angle, realizes locking effect through powerful pretightning force. Because the standard thread and the polygonal thread are mature in processing technology, the processing difficulty is relatively low, and the rate of finished products is effectively guaranteed. Therefore, the wedge-shaped thread locking effect is realized by combining and using threads with different shapes. Through reducing the processing degree of difficulty, production efficiency and yield have been improved.

Drawings

Fig. 1 is a schematic diagram of a local half-section structure of a bolt connection nut of a locking combined threaded fastener and a standard threaded connection polygonal thread.

Fig. 2 is a schematic diagram of a standard threaded connection polygonal thread of a bolt connection nut of the anti-loose combined threaded fastener, which is a partial half-section structure of a square thread.

Fig. 3 is a partial half-section structural schematic diagram of a trapezoidal thread in a standard threaded connection polygonal thread of the anti-loose combined threaded fastener of the present invention.

Fig. 4 is a partial half-section structural schematic diagram of the mutual connection between the square thread and the trapezoidal thread in the polygonal thread of the anti-loose combined threaded fastener of the present invention.

In the figures, the reference numerals are explained as follows:

1 bolt 2 nut 3 standard thread 4 polygon thread.

Detailed Description

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

As shown in fig. 1-4, a loose-proof combination threaded fastener includes: the bolt is composed of a bolt 1 and a nut 2, the bolt 1 is connected with the nut 2, and threads in the bolt 1 or the nut 2 are standard threads 3, and the other threads are polygonal threads 4; the polygonal thread 4 comprises: square threads, trapezoidal threads, sawtooth threads, and round threads; the standard thread 3 and the polygonal thread 4 are combined for use, and when the connection is carried out, the edge of the polygonal thread 4 is in contact with and tightly abutted against the inclined surface of the standard thread 3, and meanwhile, an included angle with a certain angle is formed.

In particular, according to the wedge thread anti-loosening principle. Bolt 1 is connected nut 2, standard screw thread 3 with during the contact is connected to polygon screw thread 4, because the difference of screw thread inclination separately, polygon screw thread 4 with after standard screw thread 3 registrates each other, both ends about 4 ends of polygon screw thread (cusp) with during the inclined plane contact of standard screw thread 3, can produce certain contained angle. And concentrates the points of force to the edge positions of the polygonal thread 4. When pretightening force is applied to the bolt 1, one end above the edge of the polygonal thread 4 is tightly abutted against the inclined surface of the downward surface of the standard thread 3. By applying strong pretightening force, when the pressing force is greater than the loosening force of the bolt 1, the aim of preventing loosening can be fulfilled, and the bolt 1 is tightly connected.

When the external thread of the bolt 1 screw is the standard thread 3, the internal thread of the nut 2 is the polygonal thread 4, which includes: square thread, trapezoidal thread, sawtooth thread, round thread. On the contrary, when the external thread of the bolt 1 screw is the polygonal thread 4, the method comprises the following steps: and when the screw thread is a square screw thread, a trapezoidal screw thread, a sawtooth screw thread or a round screw thread, the internal screw thread of the nut 2 is the standard screw thread 3. The two are used in cooperation with each other.

The cross section of the square thread is a square or rectangular polygon, and the upper edge and the lower edge of the square thread are abutted and clamped between the two parallel standard threads 3. The top edge of the square thread abuts against the downward inclined surface of the standard thread 3, the top edge of the square thread is a stress point, and the square thread is tightly attached to the downward inclined surface of the standard thread 3 through strong pretightening force. One end of the bottom edge of the square thread is tightly propped against the upward inclined surface of the standard thread 3. The surface of the square thread and the downward inclined surface of the standard thread 3 form a certain included angle, the included angle is usually 30 degrees, and the included angle can range from 1 degree to 90 degrees. Wherein, the included angle between two standard screw threads 3 is 60 degrees. After the polygonal thread 4 is connected with the square thread, the extrusion force of the polygonal thread and the square thread is larger than the torque force of the bolt 1 when the bolt is loosened, so that the bolt 1 cannot be loosened, and continuous anti-loosening connection is kept. The bolt 1 is connected in a locking manner by means of the pretightening force and the angle setting of the contact point of the threaded end.

The cross section of the trapezoidal thread is trapezoidal, the cross section of the sawtooth thread is triangular, the special cross section is right-angled triangle, and the cross section of the round thread is semicircular. The cross section of the standard thread 3 is an acute triangle, and the included angle between the two standard threads 3 is 60 degrees. The polygonal threads 4 are matched and connected with the polygonal threads 4 according to requirements. For example: the square thread is connected with the trapezoidal thread and the sawtooth thread. And certain included angle is kept when the polygonal threads 4 are connected, so that larger locking force is realized.

Because the production process of the standard thread 3 is mature, and the production processes of the square thread, the trapezoidal thread, the sawtooth thread and the round thread are mature, the combination of the two products achieves the connecting effect of the wedge-shaped nut 2, and the anti-loose connection of the threaded fastener is realized by utilizing the anti-loose principle of the wedge-shaped thread.

Claims

1. A locking combination threaded fastener, comprising: the bolt is connected with the nut, and one of the threads in the bolt or the nut is a standard thread, while the other is a polygonal thread; the polygonal thread includes: square threads, trapezoidal threads, sawtooth threads, and round threads; the standard thread and the polygonal thread are combined for use, and when the standard thread and the polygonal thread are connected, the edge of the polygonal thread and the inclined surface of the standard thread are in contact with each other and are abutted against each other, and meanwhile, an included angle with a certain angle is formed.

2. A locking combination threaded fastener as defined in claim 1 including: the included angle between the polygonal thread and the standard thread ranges from 1 degree to 90 degrees.

3. A locking combination threaded fastener as defined in claim 1 further comprising: one of the polygonal threads and the standard threads is an external thread, and the other one of the polygonal threads and the standard threads is an internal thread, and the polygonal threads and the standard threads are matched with each other for use.

4. A locking combination threaded fastener as defined in claim 1 including: and increasing the length of the nut and the number of thread turns according to the requirement.