A valve rotation bending fatigue testing machine

Abstract

The invention discloses a rotating bending fatigue testing machine for valves.The rotating bending fatigue testing machine for valves comprises a rack, a valve to be tested, a loading input rod, a motor enabling the valve to be tested to rotate, and an axial force loading device used for applying thrust to the valve to be tested through the loading input rod, wherein the motor and the axial force loading device are arranged on the rack, and the two ends of the valve to be tested are fixed to an output shaft of the motor and the loading input rod respectively.According to the rotating bending fatigue testing machine for valves, the axial force and bending moment are loaded on the valve to be tested in a rotating state through the gravity action of a first weight and the gravity action of a second weight respectively, and thus a rotating bending fatigue test is carried out; the loading mode is simple and reliable, and precision is high.The axial force loading device can apply axial force to the valve to be tested, and the axial force is closer to the stress state of the valve under actual working conditions.Thus, the rotating bending fatigue testing machine for valves can carry out a fatigue performance test on valves in more complex stress states.

Description

technical field [0001] The invention relates to a testing device, in particular to a valve rotation bending fatigue testing machine. Background technique [0002] Valves, exhaust valves and their matching valve seats are the key precision components in the engine valve train. The valves and seats cooperate to control the intake of fresh air and the discharge of exhaust gas in the engine cylinder. The working condition of the valve is harsh, and it reciprocates at a high speed driven by the camshaft. The valve disc is subjected to thousands of alternating cycle impact loads per minute and the erosion of high-temperature gas, and incomplete combustion products are deposited on the valve cone surface. . The reliability and life of the valve directly affect the reliability and life of the engine valve train and the whole machine. Fatigue refers to the accumulation of internal damage of a material or component under the action of cyclic alternating loads until failure. It is v...

AI Technical Summary

Problems solved by technology

[0003] Existing testing equipment generally only focuses on the wear test of the valve cone surface and the joint surface of the seat ring, ignoring the research on the fatigue performance of the valve

In addition, the existing rotary bending fatigue testing machine can only test the standard sample with a stress ratio of -1, and cannot perform fatigue tests on the entire valve, let alone apply an axial force to the valve sample to perform composite stress. the test

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