CN-122014734-A - Elastic check bolt

CN122014734ACN 122014734 ACN122014734 ACN 122014734ACN-122014734-A

Abstract

The invention provides an elastic locking bolt which comprises a body, wherein the body comprises a bolt head and a screw rod which are sequentially connected, one end, far away from the screw rod, of the bolt head is provided with a mounting part, a deep hole is axially formed in the body, the deep hole extends from the end face of the mounting part to the inside of the screw rod, the tail end of the deep hole does not penetrate to the thread root of the screw rod, the bolt head comprises a conical disc section positioned below the mounting part, the outer circumferential surface of the conical disc section forms a wedge-shaped matching surface for being contacted with a connected piece, an inwards concave inner hexagonal hole is formed in the mounting part, the inner hexagonal hole is coaxially communicated with the deep hole, the aperture of the inner hexagonal hole is larger than that of the deep hole, at least one pair of radial through holes are further formed in the mounting part, and the elastic locking bolt solves the problems of poor locking stability, poor reliability, easiness in fatigue failure and low service life of the elastic locking bolt in the prior art.

Inventors

WANG YANBING
WANG KUI
LV BINGLIN
JIANG HAN
WANG CHUANJUAN

Assignees

中船动力研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. An elastic lockbolt, comprising: The screw bolt comprises a body, a screw bolt and a screw bolt, wherein the body comprises a bolt head and a screw bolt which are sequentially connected, and an installation part is arranged at one end of the bolt head, which is far away from the screw bolt; The bolt head comprises a conical disc section positioned below the mounting part, and the outer peripheral surface of the conical disc section forms a wedge-shaped matching surface for contacting with a connected piece; The mounting part is provided with an inward concave inner hexagonal hole which is coaxially communicated with the deep hole, and the aperture of the inner hexagonal hole is larger than that of the deep hole; The mounting part is also provided with at least one pair of radial through holes, two ends of the radial through holes are respectively communicated with the inner wall of the inner hexagonal hole and the outer peripheral surface of the mounting part, and the central axes of the at least one pair of radial through holes are positioned on the same straight line.
2. The elastic lockbolt of claim 1, wherein the taper angle alpha of the conical disc section is in a range of 5 DEG≤alpha≤6 DEG, and the outer diameter of the conical disc section gradually increases from the side close to the mounting portion to the side far from the mounting portion.
3. The elastic lockbolt of claim 1, wherein the lower end face of the mounting portion is smoothly connected with the upper end face of the conical disc section through a first transition arc.
4. The elastic lockbolt of claim 1, wherein the outer peripheral edge of the top of the conical disc section is provided with a second transition arc, and the second transition arc is tangentially connected with the wedge-shaped mating surface of the conical disc section.
5. The elastic lockbolt of claim 1, wherein the bolt head further comprises a neck connecting the conical disc section and the screw, a third transition arc is arranged at the joint of the neck and the screw, and the third transition arc is smoothly connected with the outer peripheral surface of the conical disc section.
6. An elastic lockbolt according to claim 1, wherein the inlet end edge of the internal hexagonal hole is provided with a guide chamfer.
7. The elastic lockbolt of claim 1, wherein a first stepped surface is formed at the joint of the bottom of the inner hexagonal hole and the top of the deep hole, and a transition chamfer is arranged on the first stepped surface.
8. An elastic lockbolt according to claim 1, wherein a plurality of the radial through holes are uniformly distributed along the circumferential direction of the mounting portion.
9. The elastic lockbolt according to claim 1, wherein the end of the deep hole is provided with a tapered hole-enlarging section, and the tapered surface of the tapered hole-enlarging section converges toward the end of the screw.
10. The elastic lockbolt according to claim 1, wherein the depth of the inner hexagonal hole is larger than the axial distance from the radial through hole to the end face of the mounting portion, and the hole bottom of the inner hexagonal hole is located below the radial through hole.

Description

Elastic check bolt Technical Field The invention relates to the technical field of lockbolts, in particular to an elastic lockbolt. Background An elastic lockbolt is a mechanical fastener which resists dynamic loads such as vibration, impact and the like by continuous axial tension generated by elastic deformation, thereby preventing loosening of nuts or bolts. At present, the existing elastic check bolt has the following technical problems that 1. The anti-loosening stability and the reliability are insufficient, the restoring force of an elastic element is gradually weakened under strong vibration, impact or alternating load, so that the pretightening force is reduced, and the anti-loosening effect is obviously reduced or even fails. 2. The existing partial locking bolt is easy to fatigue failure and has low service life, and the existing partial locking bolt is easy to fatigue failure at the part which bears cyclic load for a long time or locally generates stress concentration, thereby reducing the service life of the bolt. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an elastic locking bolt, which solves the problems of insufficient locking stability and reliability, easy fatigue failure and low service life of the elastic locking bolt in the prior art. To achieve the above object, the present invention provides an elastic check bolt comprising: The screw bolt comprises a body, a screw bolt and a screw bolt, wherein the body comprises a bolt head and a screw bolt which are sequentially connected, and an installation part is arranged at one end of the bolt head, which is far away from the screw bolt; The bolt head comprises a conical disc section positioned below the mounting part, and the outer peripheral surface of the conical disc section forms a wedge-shaped matching surface for contacting with a connected piece; The mounting part is provided with an inward concave inner hexagonal hole which is coaxially communicated with the deep hole, and the aperture of the inner hexagonal hole is larger than that of the deep hole; The mounting part is also provided with at least one pair of radial through holes, two ends of the radial through holes are respectively communicated with the inner wall of the inner hexagonal hole and the outer peripheral surface of the mounting part, and the central axes of the at least one pair of radial through holes are positioned on the same straight line. As a more preferable mode, the taper angle alpha of the conical disc section is in the range of 5 degrees less than or equal to alpha less than or equal to 6 degrees, and the outer diameter of the conical disc section gradually increases from the side close to the mounting part to the side far away from the mounting part. The value range of the conical angle alpha is set to be within the range of the self-locking angle of 5 degrees or more and less than or equal to 6 degrees, when the bolt is screwed down, the conical disc section and the surface of the connected piece form tight wedge-shaped fit, so that the risks of stress concentration and easy sliding caused by overlarge angle can be avoided, the wedge-shaped effect is prevented from being lost due to overlarge angle, and the anti-loosening performance of the bolt under dynamic load is remarkably improved. Furthermore, the gradual taper angle of 5 ° to 6 ° greatly increases the actual contact area of the bolt head with the surface to be joined, compared to conventional flat washer constructions. The gradual change contact mode can more uniformly spread huge pretightening force on the base material, so that soft materials (such as aluminum and composite materials) are prevented from being crushed, sunk or damaged on the surface due to overhigh local pressure, and the long-term stability of connection is ensured. Furthermore, the outer diameter of the conical disc section gradually increases outwards from the mounting part, streamline section transition is formed, stress concentration phenomenon at the right-angle turning part is effectively eliminated, and the smooth geometric form enables the root to be prevented from fatigue crack too early when the bolt bears alternating load or impact vibration, so that the service life of the bolt body is prolonged. As a more preferable mode, the lower end face of the mounting part is smoothly connected with the upper end face of the conical disc section through a first transition arc. Firstly, by introducing the first transition circular arc, the right angle or acute angle turning at the joint of the lower end surface of the mounting part and the upper end surface of the conical disc section can be effectively eliminated, so that the structure is smoothly transited at the joint. When the bolt bears tensile, bending or vibration load, the concentrated stress can be uniformly dispersed through arc transition, and the stress peak value is greatly reduced, so that the