Fatigue test device for VVT (Variable Valve Timing) engine piston

Abstract

The invention provides a fatigue test device for a VVT (Variable Valve Timing) engine piston and belongs to the technical field of engine test equipment. The problem that the test data of the present fatigue test device is not accurate enough is solved. The fatigue test device for the VVT engine piston comprises a frame, wherein a first cam is in rotating connection with the frame through a rotating shaft; a connecting shaft is vertically connected with a side face of the first cam; a distance-adjusting structure is arranged between the connecting shaft and the cam; a sleeve is fixedly connected with the frame; the rotating shaft is connected with a driving structure; a detecting structure for detecting the coaxiality of a cylinder sleeve and the piston is also arranged on the frame; an adjusting structure for adjusting the coaxiality of the cylinder sleeve and the piston is arranged on the sleeve and the connecting shaft. The fatigue test device for the VVT engine piston can be used for performing a fatigue test under the condition that the coaxiality of the cylinder sleeve and the piston is ensured. The accuracy of the test data is increased.

Description

technical field [0001] The invention belongs to the technical field of engine test equipment, and relates to a fatigue test device for VVT engine pistons. Background technique [0002] With the improvement of living standards and the acceleration of the pace of life, cars have become an indispensable means of transportation and means of transportation in life. In the complex structure of cars, the engine is the heart of the car, providing power for the walking of the car, which is related to the car. Power, economy, and environmental protection. To put it simply, an engine is an energy conversion mechanism, that is, the thermal energy of gasoline (diesel) or natural gas is converted into mechanical energy by expanding the combustion gas in a sealed cylinder, pushing the piston to do work, and this is the most basic principle of the engine. With the improvement of the level of science and technology, technicians are constantly improving the engine, and then VVT technology ap...

AI Technical Summary

Problems solved by technology

The test equipment can detect the fatigue life of the piston skirt, but it cannot detect the wear life of the piston for a long time. At present, when testing the fatigue life of the piston, the usual practice is to insert the piston into the cylinder liner, and drive the piston to reciprocate through the mechanism to Detect the wear degree of the piston, but due to the lack of effective coaxiality detection when the piston is inserted into the cylinder liner, the local force on the piston is too large, which leads to excessive local wear of the piston during the test, and the test data is not accurate enough

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