A Wear Test Device for Cam-Tappet Friction Pair

Abstract

The invention discloses a wear test device for a cam-tappet friction pair, which comprises a machine base, a motor, a camshaft, a cam lower end frame, a support rod and a cam pushing mechanism, and the cam lower end frame is fixed on the machine base through the support rod. The motor is connected with the camshaft, and the camshaft has an intake cam and an exhaust cam, and the camshaft is installed on the lower end frame of the cam, and the cam pushing mechanism includes the intake wheel pushing mechanism and the exhaust wheel pushing mechanism, Both the push mechanism and the exhaust wheel push mechanism include a tappet, a push rod, an upper spring seat, a loading spring, a lower spring seat and a loading force adjustment mechanism, and the tappet slides through and connects on the lower end frame of the cam. The invention solves the problem of lengthy and complicated period of engine bench test and actual engine comprehensive investigation, and can realize the evaluation of wear characteristics of cam-tappet friction pair within a short test period, providing reliable basis for actual production.

Description

technical field [0001] The invention relates to the field of wear testing of a cam-tappet friction pair, in particular to a wear testing device for a cam-tappet friction pair. Background technique [0002] The paired pair of cam and tappet is the key component in the valve train. When the cam rotates around the camshaft, it controls the movement law of the tappet, and then transmits the motion to the valve, so that it opens and closes the valve according to the design law. , to ensure the "breathing" of the engine. With the continuous development of high-speed and high-power diesel engines, the spring force of the valve train and the relative sliding speed between the contact surfaces of the cam tappets continue to increase, further deteriorating the working conditions of the cam tappet contact pairs. Among the various parts of the valve train, the contact stress between the cam and the tappet is the most serious, and the size of the contact stress is a key factor affecting...

AI Technical Summary

Problems solved by technology

[0003] However, the experimental results of the cam-tappet friction pair wear test carried out at home and abroad are not ideal, and the working load of the cam and tappet, the type of tappet, the type of spring, the speed of the engine, the quality and pressure of the lubricating oil cannot be adjusted at will. , which makes it impossible to study the working conditions of the cam-tappet friction pair in various harsh working environments

However, the wear test of the cam-tappet friction pair is usually carried out by the durability test of the whole machine, which not only has a long cycle and low efficiency, but also requires a lot of manpower and material resources

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