Friction and wear test device for variable load cylinder liner and piston ring

Abstract

A variable-load cylinder-sleeve piston-ring frictional wear testing device is mainly composed of a main shaft motor, a guide rail, a sliding table, left and right uprights, a work table, a lever, a loading rod, a swing limiter, a load changer, an inner concave cambered-surface lower clamp and an outer convex cambered-surface upper clamp. An alternating force is generated by the load changer, and then is amplified by the lever to act on a test piece, thereby realizing radial loading of a piston ring to a cylinder sleeve; a variable load is measured in real time by a pressure sensor between theload changer and the lever; friction is measured by a foil gauge on the loading rod; the swing amplitude of the lever is reduced by the swing limiter; the loading rod comes into contact with the outer convex cambered-surface upper clamp through a ball pair to guarantee that the loading direction is vertically downward; the rotating speed of the motor is controlled by means of a program so as to carry out frictional wear tests at different speeds. The testing device is simple in structure, various in testing functions and high in accuracy.

Description

technical field [0001] The invention relates to a variable load cylinder liner-piston ring friction and wear test device, which is especially suitable for testing the cylinder liner-piston ring friction and wear performance parameters of the engine under different working conditions. Background technique [0002] Cylinder liner-piston ring is one of the most important friction pairs of the engine, and its friction and wear performance directly affects the performance of the engine. The radial pressure between cylinder liner and piston ring directly affects its friction and wear performance. For the engine cylinder liner-piston ring friction pair, its radial pressure changes periodically and continuously during the reciprocating stroke of the piston ring. The pressure curve is horizontal in the suction and exhaust strokes, and parabolic in the compression and power strokes, rising first and then falling. Therefore, one of the difficulties in the development of engine cylind...

AI Technical Summary

Problems solved by technology

Each of these loading devices has its own advantages and disadvantages. The first three use the whole ring test, which is easy to install, but the adjustment of the load is more complicated and the load measurement is more difficult; the latter load can be directly read by the mass of the weight, but the lever Lateral oscillation affects the accuracy of the measurement results

The existing cylinder liner-piston ring friction and wear testing machine can measure the friction force between the cylinder liner-piston ring in real time, and can realize radial loading within a certain range, but it cannot achieve continuous load for a single test. Changes, the test can only be carried out under the set load, and the occurrence and measurement of the alternating load cannot be realized

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