Safety bolt with blind hole

A technology of safety bolts and blind holes, which is applied in the direction of bolts, screws, nuts, etc., can solve the problems of reducing bearing capacity, affecting stress distribution, stress concentration, etc., and achieve the effect of increasing parts and improving reliability

Inactive Publication Date: 2013-12-18
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The existing safety bolts are generally provided with grooves on the bearing surface to reduce the cross-sectional area to reduce the bearing capacity. However, this structure is prone to stress concentration due to the grooves on the bearing surface, which affects the stress under normal use. distribution, which is not conducive to the use of safety bolts in normal conditions

Method used

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  • Safety bolt with blind hole

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Embodiment Construction

[0007] The present invention is described in further detail below by way of specific embodiments:

[0008] The safety bolt of the present invention is applied in the emergency disconnection design of the inner flap of the ARJ21-700 aircraft. It is made of A286 solid solution aging stainless steel round bar. The outer diameter of the bolt is 19.6mm, the inner diameter of the blind hole is 8.6mm, and the depth of the blind hole is 58mm. Because the screw part of the bolt does not have a groove, the screw part of the safety bolt has a smooth profile surface; and the blind hole has a certain depth, not only the cross-section at the groove in the prior art is reduced, which increases the risk of fracture during emergency The parts that may be generated, thereby improving the reliability of emergency fracture. In addition, the shape of the safety bolt of the present invention is the same as that of ordinary bolts, and can be assembled in the form of ordinary bolt connections.

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Abstract

The invention provides a safety bolt with a blind hole and relates to the technical field of safety bolts and discloses a bolt with the blind hole parallel to the screw axis from the center of the surface of a nut to the inside of a screw. Under an abnormal use state, the screw first breaks due to the reduction of the sectional area of the screw, spread of destructive force is prevented, and safety of important parts is guaranteed; under the normal use state, the shape surface of the screw is not changed, and the safety bolt can be normally used like an ordinary bolt.

Description

technical field [0001] The invention relates to the technical field of safety bolts. Background technique [0002] In terms of aircraft reliability design, the concept of losing parts to protect the whole and losing secondary parts to protect important parts under abnormal use is usually adopted. Therefore, safety bolts are usually used in the parts that need to be lost first. The existing safety bolts are generally provided with grooves on the bearing surface to reduce the cross-sectional area to reduce the bearing capacity. However, this structure is prone to stress concentration due to the grooves on the bearing surface, which affects the stress under normal use. The distribution is not conducive to the use of safety bolts in normal conditions. Contents of the invention [0003] The purpose of the present invention is: in order to meet the use requirements of safety bolts under normal conditions, increase the possible breakage parts during emergency, thereby improving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B41/00F16B35/00
Inventor 崔金玲凌晓涛姚雄华
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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