Hydraulic expansion locking bolt

Abstract

The invention discloses a hydraulic expansion locking bolt. The bolt comprises a head, a flange, a rod part and a threaded part, wherein the middle part of the flange is provided with a first annularexpansion oil chamber, the outer wall of the middle part of the rod part is provided with the threaded part, a second annular expansion oil chamber is provided inside the bottom end of the rod par, amain oil chamber is opened along the bolt axis, the main oil chamber is connected to the first annular expansion oil chamber through a first oil through hole, and the main oil chamber is connected tothe second annular expansion oil chamber through a second oil through hole; the bolt head is provided with a piston rod, and the end of the piston rod is provided with a pressure screw. The hydraulicexpansion locking bolt provided by the invention compensates the pre-tightening force by designing expansion oil chambers inside the bolt, so as to achieve the purpose of enhancing the bolt connectionstrength, damping vibration and preventing loosening.

Description

technical field [0001] The invention relates to the technical field of fasteners, in particular to a hydraulic expansion locking bolt which adopts static pressure expansion technology to adjust reverse torque, absorb shock and prevent loosening. Background technique [0002] As one of the most commonly used fasteners, bolts mainly play the role of connection and fastening. The existing bolts are generally composed of a head and a threaded rod. A form of mechanical static coupling to fix the relative position or attitude between the connected parts so that there is no relative movement. In the case of little change in static load and working temperature, due to the self-locking conditions and the anti-loosening effect of friction, the threaded connection generally will not automatically loosen, but under the action of shock, vibration or variable load, the screw pair will not loosen automatically. The friction force may decrease or disappear instantaneously, resulting in the...

AI Technical Summary

Problems solved by technology

In the case of little change in static load and working temperature, due to the self-locking conditions and the anti-loosening effect of friction, the threaded connection generally will not automatically loosen, but under the action of shock, vibration or variable load, the screw pair will not loosen automatically. The friction force may decrease or disappear instantaneously, resulting in the loosening of the threaded connection; especially in the case of high temperature or large temperature changes, due to the creep and stress relaxation of the materials of the threaded connection and the connected parts, the connection The pre-tightening force and friction force gradually decrease, which will eventually lead to joint failure

Images