Abrasion test device for cam-tappet friction pair

Abstract

The invention discloses an abrasion test device for a cam-tappet friction pair. The abrasion test device comprises an engine base, a motor, a camshaft, a cam lower end rack, a supporting rod and a campush mechanism, wherein the cam lower end rack is fixed on the engine base through the supporting rod; the motor is connected with the camshaft; an air inlet cam and an air outlet cam are arranged onthe camshaft; the camshaft is mounted on the cam lower end rack; the cam push mechanism comprises an air inlet wheel push mechanism and an air outlet wheel push mechanism; each of the air inlet wheelpush mechanism and the air outlet wheel push mechanism comprises a tappet, a push rod, an upper spring seat, a loading spring, a lower spring seat and a loading force adjusting mechanism; and the tappet penetrates through the cam lower end rack in a sliding manner. According to the abrasion test device disclosed by the invention, the problem that the complete engine bench test and actual engine integrated survey are long in cycle and complicated can be solved, abrasion characteristic evaluation of the cam-tappet friction pair can be completed in a short test cycle, and a reliable basis is provided 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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