Development of a New High-Pressure Piston Pump Test for Hydraulic Fluid Qualification

Abstract

It is difficult, if not impossible, to select any single test that will model the expected performance of hydraulic fluids in a wide range of hydraulic pumps. Increased pressures often encountered in new hydraulic pump applications compounds this problem. However, some basic assessment of hydraulic fluid performance is necessary for numerous reasons such as: developing an appropriate fluid purchase policy, international standard development, fluid classification and others. Since the classic standard tests such as: ASTM D2882, DIN 51389 and others are simply inadequate for this task and also since the manufacturer , Eaton Inc., no longer manufactures these pumps, it has been necessary to develop an alternative test [1][2][3]. The Bosch-Rexroth Corporation has developed a high-pressure piston pump test that has been an excellent predictor of hydraulic fuid performance for many years. This test is currently being developed as a candidate for an ASTM Standard and is the subject of this report.

Experimental Analysis on Oil Film Properties of Plane Port Pair in Axial Piston Machine

“…Appearing as rupture, wear and so on, the failures of their port plate or cylinder block end surface are happening with increasing frequency here [2]. At home and abroad, some related experimental equipments were built up to find reasons and solutions, but most of them worked on hydrostatic simulations [3][4][5] or embedded test methods [6]. Actually it's difficult for main signals to be captured in real time, and the film thickness cannot be modulated during testing [7] so that more exact data or conclusions of lubrication experiments cannot be gotten easily.…”