Angular-contact ball-bearing radial static stiffness measurement apparatus

Abstract

The invention belongs to the liquid rocket engine technology field and especially relates to an angular-contact ball-bearing radial static stiffness measurement apparatus. A support is vertically fixed to a pedestal. A reducing sleeve is connected to the support. Adjusting pad I, a left side bearing, a baffle disc I, a left side disc spring, a disc spring isolation pad, a right side disc spring, a baffle disc II, an adjustment pad between bearings, a right side bearing and an adjusting pad II successively sleeve a stress application shaft. A tightening nut is screwed on the stress application shaft. According to a tightening torque requirement, a load is applied and then an assembly passes through the reducing sleeve. Two bearings are uniformly distributed on left and right positions of a middle portion of the reducing sleeve. Two hydraulic assistors are symmetrically placed on two sides of the stress application shaft, are fixed to the pedestal and are close to the support. A pressing plate is fixed to the reducing sleeve. Two electrical vortex sensors are installed on two ends of the pressing plate. The apparatus can be used for measuring double-row constant-pressure preloaded angular contact bearing radial static stiffness and possesses certain versatility, accuracy and convenience in the liquid rocket engine field.

Description

technical field [0001] The invention belongs to the technical field of liquid rocket engines, and in particular relates to a radial static stiffness measuring device for angular contact ball bearings. Background technique [0002] When the liquid rocket engine rotor operating speed n is lower than 0.7Ncr1 (first-order critical speed), the rotor is called a rigid rotor. For a rigid rotor, the first-order critical speed mainly depends on the rotor support stiffness, that is, the radial static stiffness of the angular contact ball bearing. [0003] According to the empirical calculation formula of radial static stiffness, its value is generally not less than 1×10 8 N / m. However, due to the difference in ball structure and heat treatment, the difference in bearing manufacturing process, and the difference in assembly and coordination, the actual static stiffness value of the bearing is often smaller than the calculated value. Overlap, resulting in a resonance fault, affecting...

AI Technical Summary

Problems solved by technology

However, due to the difference in ball structure and heat treatment, the difference in bearing manufacturing process, and the difference in assembly and coordination, the actual static stiffness value of the bearing is often smaller than the calculated value. Overlap, resulting in resonance failure, affecting the normal operation of the engine

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