Mixed Lubrication Characteristics Between the Piston and Cylinder in Hydraulic Piston Pump-Motor-Reference-Cited by-同舟云学术

Mixed Lubrication Characteristics Between the Piston and Cylinder in Hydraulic Piston Pump-Motor

Published:1995-01-01 Issue:1 Volume:117 Page:80-85
ISSN:0742-4787
Container-title:Journal of Tribology
language:en
Short-container-title:

Author:

Fang Yi¹,Shirakashi Masataka²

Affiliation:

1. Niigata University, Niigata, 950-21, Japan

2. Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940-21, Japan

Abstract

This paper presents a method for evaluating the lubrication characteristics between the piston and cylinder in a swash-plate type axial piston pump-motor under mixed lubrication conditions. A numerical analysis is carried out in order to obtain the metal contact force between the piston and cylinder, and the contact ratio λ is shown to represent the mixed lubrication condition both for the pump and the motor strokes. The contact ratio, λ, is also obtained experimentally by detecting electric resistance between the piston and cylinder in a practical swash-plate type machine. The experimental result is expressed by a relationship between λ and SO (the ratio of dynamic pressure to supply pressure) as indicated by the numerical analysis. In conclusion, the mixed lubrication characteristics between the piston and cylinder in a swash-plate type pump-motor is expressed by λ−SO curve irrespective of the operating conditions such as the supply pressure or the rotation speed.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Link

http://asmedigitalcollection.asme.org/tribology/article-pdf/117/1/80/5606446/80_1.pdf

Reference18 articles.

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2. Dransfield P. , 1967-1968, “Hydraulic Lock with Single-Land Pistons,” Proc. Inst. Mech. Engs., Part 1, Vol. 182-27, 1967–1968, pp. 60–3612.

3. Renius, K., -Th., 1974, “Investigations of the Friction Between Piston and Cylinder of Tilted Plate Axial Piston Machines,” VDI-Forsch-Heft 561.

4. Dowd J. R. , and HarwellF. T., 1975, “Tribological Interaction Between Piston and Cylinder of a Model High Pressure Hydraulic Pump,” Transactions of ASLE, Vol. 18-1, pp. 21–30.

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