CN211951127U - Anti-loosening bolt with sawtooth structure - Google Patents

Abstract

A check bolt with a sawtooth structure belongs to the technical field of threaded fasteners and comprises a bolt head and a screw rod, wherein a welding area and a tooth groove which is arranged in an annular shape are arranged on the bolt head, and the bolt head is fixedly connected with the screw rod through friction welding. The composite material can also be produced in a single piece, and has extremely outstanding use effect under the conditions of high speed, large dynamic load, large vibration, large temperature difference and lubrication.

Description

Anti-loosening bolt with sawtooth structure

Technical Field

The utility model belongs to the technical field of threaded fastener, a check bolt is related to, specific saying so relates to a can be at high speed, the dynamic load is big, the vibration is big, the difference in temperature is big, have the check bolt of band saw tooth structure that uses under the lubricated operating mode.

Background

Due to the advantages of large connecting force, compact structure, convenient disassembly and the like, the threaded connection widely exists in various mechanical structures and is one of the most common fastening means. The threaded connection allows reliable transmission of forces (or movements) between the coupled structures, which also need to ensure good tightness of the fitting body when the coupled parts are pressure vessels or pipes.

When the static load and the working temperature are not changed greatly, the threaded connection can not be loosened automatically generally. However, under the action of impact, vibration, variable load or high temperature and temperature change, the pretightening force and the friction force in the connection are gradually reduced, so that the connection can be failed. The main causes of loosening of threaded connections are the initial deformation of the threaded connection, the action of axial loads, the action of transverse loads. The loose screw connection will influence the machine operation, the serious one will cause the accident, must take effective locking measure during the design.

At present, the main measures of thread anti-loosening include friction anti-loosening, mechanical anti-loosening, anti-loosening by destroying the motion relation of a screw pair and the like, the friction anti-loosening is to prevent relative rotation through friction torque, pressure can be generated by longitudinal or transverse compression of the screw pair, and a butt nut, a spring washer, a common anti-loosening bolt and the like are often adopted; mechanical anti-loosening is usually realized by screwing a cotter pin and a hexagonal slotted nut, penetrating the cotter pin into a small hole at the tail part of a bolt and a slot of the nut, and breaking the tail part of the cotter pin to be tightly attached to the side surface of the nut; or after the stop washer nut is adopted for screwing, the single-lug or double-lug stop washer is respectively bent and attached to the side face of the nut and the side face of the connected piece, and then the nut can be locked. If the two bolts need to be locked in a duplex way, a duplex stop washer can be adopted to mutually brake the two nuts; or a series steel wire is adopted and a low-carbon steel wire is penetrated into the head hole of each screw, and the screws are connected in series to be mutually braked. The anti-loosening method for destroying the movement relationship of the screw pair is that the extending part of the tail end of the bolt is riveted after the riveting anti-loosening nut is screwed down, or the punching is carried out at the seaming position of the tail end of the bolt and the nut by using a punch, and the loosening is prevented by using a punching point.

At present, although the number of self-locking bolts is large, each variety has few and single application occasions; the existing self-locking bolt has the disadvantages of complex structure, various composition forms, high cost and inconvenient maintenance; the self-locking bolt has many conditions related to variety, quantity, use environment, vibration, temperature rise, lubrication, materials, friction pairs and the like in the self-locking aspect, and brings difficulty to research.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is complicated to present auto-lock bolt structure, and is with high costs, and the maintenance is inconvenient, and the auto-lock bolt service function singleness of current structure, application scenario are limited etc. is not enough, provides a take locking bolt of sawtooth structure, simple structure, and low in manufacturing cost can satisfy high-speed, dynamic load is big, the vibration is big, the difference in temperature is big, have lubricated operating mode user demand.

The technical scheme of the utility model: a check bolt with a sawtooth structure comprises a screw rod and a bolt head; the method is characterized in that: the upper portion of the screw is provided with a section of optical axis, the top surface of the optical axis is provided with a first welding area, the bottom surface of the bolt head is provided with a second welding area, an annular tooth groove is formed in the outer circumference of the second welding area, and the bolt head is fixedly arranged at the top of the optical axis.

The opening of the tooth groove faces to the direction opposite to the screwing direction of the screw.

The tooth grooves are sawtooth grooves, the distances from the groove bottom to the groove top of each tooth groove are the same, the outer diameters of the tooth grooves are internally tangent to the regular hexagon bolt heads, and the number of the tooth grooves is not less than 20.

The bolt head is fixedly connected with the optical axis through friction welding.

The inner diameter of the second welding area is slightly larger than the outer diameter of the optical axis.

The utility model has the advantages that: the utility model provides a check bolt with sawtooth structure, which comprises a bolt head and a screw rod, wherein the bolt head is provided with a welding area and a tooth groove which is arranged in an annular shape, the bolt head and the screw rod are fixedly connected concentrically by friction welding, compared with the prior bolt, the utility model reduces the upsetting process in the prior bolt processing process, and the thread processing at the screw rod part is easy, when the sawtooth part of the sawtooth check bolt is contacted with the connecting surface of a workpiece, the bolt is continuously screwed to reach the required pre-tightening torque, the installation process is simple, a flat washer and a spring washer are not needed to be installed in the use process, when the sawtooth check bolt is installed and is in close contact, the sawtooth at the end part of the sawtooth bolt head reacts on the surface of the workpiece under the positive pressure effect of the axial direction, so that the surface of the workpiece generates micro-elastic deformation because the contact area of the sawtooth is reduced, the pressure of unit area is increased, on the premise that the pre-tightening torque is not changed, the sawteeth are embedded into the connecting surface of the workpiece in a micro mode, the horizontal vibration of 1 ten thousand times/minute can be borne, good self-locking and anti-loosening performance is achieved, the thread structure is suitable for threads of all tooth types (such as trapezoids, metric systems, English systems, diameter joints and modulus) of all systems, mass production and single-piece production can be achieved, and the thread structure has extremely outstanding use effects under the conditions of high speed, large dynamic load, large vibration, large temperature difference and lubrication.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of the structure of the middle screw rod of the present invention.

Fig. 3 is a schematic view of the bottom surface structure of the bolt head of the present invention.

Fig. 4 is an enlarged schematic view of a portion a in fig. 3.

FIG. 5 is a schematic view of a removed section at B-B in FIG. 4.

In the figure: the bolt comprises a screw 1, a bolt head 2, an optical axis 3, a first welding area 4, a second welding area 5 and a tooth groove 6.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 to 5, a check bolt with a sawtooth structure includes a screw rod 1 and a bolt head 2, wherein a section of optical axis 3 is arranged at the upper part of the screw rod 1, a first welding area 4 is arranged at the center of the top surface of the optical axis 3, a second welding area 5 is arranged at the center of the bottom surface of the bolt head 2, an annular tooth socket 6 is arranged on the outer circumference of the second welding area 5, and the bolt head 2 is fixedly arranged at the top of the optical axis 3.

As shown in fig. 1-5, in the anti-loose bolt with the sawtooth structure, the opening of the tooth groove 6 faces to the direction opposite to the screwing direction of the screw rod 1; the tooth grooves 6 are sawtooth grooves, the distance from the groove bottom to the groove top of each tooth groove 6 is the same, the outer diameter of each tooth groove 6 is inscribed in the head of a regular hexagon bolt, the tooth form included angle of each tooth groove is a, in the embodiment, the number of the tooth grooves 6 is 52, and a =360 °/52; the distance from the groove bottom to the groove top of each tooth groove is b, and b =3mm in the embodiment; the bolt head 2 is fixedly connected with the optical axis 3 through friction welding; the inner diameter of the second welding zone 5 is larger than the outer diameter of the optical axis 3.

As shown in fig. 1 to 5, the usage principle of the check bolt with the sawtooth structure is as follows: and after the sawtooth part of the sawtooth anti-loose bolt is contacted with the connecting surface of the workpiece, continuously screwing the bolt to reach the required pre-tightening torque. The installation process is ended. The little elastic deformation of sawtooth and work piece combined surface of sawtooth check bolt, after the installation of sawtooth check bolt is accomplished, the sawtooth of sawtooth check bolt can make and combine the work piece surface with it and produce little elastic deformation, because the sawtooth has reduced area of contact for unit area's pressure has increased, under the unchangeable prerequisite of pretension moment, makes the sawtooth imbed among the connection surface of work piece a little. At the moment, under the conditions of high speed, dynamic load, vibration, large temperature difference and lubrication of the workpiece, the sawteeth of the sawteeth anti-loosening bolt cannot withdraw from the connecting surface embedded in the workpiece, and the anti-loosening purpose is realized. During the self-locking process, the tooth part of the lower end surface is contacted with the surface of the workpiece. For right threads, only clockwise rotation is possible; the counterclockwise rotation is blocked. On the contrary, for the left-hand thread pair, the direction of the teeth is just opposite to that shown in the figure, and the left-hand thread pair is suitable for locking. The disassembly process is exactly the reverse. When the connecting device is used for connecting nonmetal materials, the metal piece gasket can be embedded on the surface matched with the anti-loose bolt with the sawtooth structure, so that the anti-loose bolt with the sawtooth structure is prevented from being embedded into a connected workpiece.

Claims (5)

1. A check bolt with a sawtooth structure comprises a screw rod (1) and a bolt head (2); the method is characterized in that: screw rod (1) upper portion is equipped with one section optical axis (3), the center department of optical axis (3) top surface is equipped with first welding region (4), the center department of bolt head (2) bottom surface is equipped with second welding region (5), be equipped with an annular tooth's socket (6) on the outer circumference of second welding region (5), annular tooth's socket (6) are the sawtooth groove, and the tank bottom of every tooth's socket (6) is all the same to the distance on groove top, and the external diameter inscribe of tooth's socket (6) is in regular hexagon bolt head, bolt head (2) are fixed to be set up the top of optical axis (3).

2. The check bolt with the sawtooth structure of claim 1, wherein: the opening direction of the tooth groove (6) is opposite to the screwing direction of the screw (1).

3. The check bolt with the sawtooth structure of claim 1, wherein: the number of the annular tooth grooves (6) is not less than 20.

4. The check bolt with the sawtooth structure of claim 1, wherein: the bolt head (2) is concentrically and fixedly connected with the optical axis (3) through friction welding.

5. The check bolt with the sawtooth structure of claim 1, wherein: the inner diameter of the second welding area (5) is slightly larger than the outer diameter of the optical axis (3).

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