This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Hydraulic Fluid Efficiency Studies in Low-Speed High-Torque Motors
Technical Paper
2009-01-2848
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper presents an investigation of the fluid viscosity properties that affect the Low-Speed High-Torque (LSHT) efficiency of hydraulic motors. Low speed torque efficiency is important because it often determines the minimum displacement (size) and operating pressure of mobile hydraulic equipment. The viscosity, viscosity index, high-shear viscosity, piezoviscosity and shear stability of prototype fluids have been characterized. These hydraulic fluids have been evaluated in a full-scale hydraulic motor dynamometer. Geroler, axial piston and radial piston motors have been evaluated. Low-speed (1 RPM) testing has been performed under constant pressure conditions in accordance with the ISO 4392-1 standard test method. Startability testing has been performed under constant load conditions in accordance with ISO 4392-2. In startability and 1 RPM testing, the axial piston motor exhibited a 6 percent efficiency gain with a high viscosity index hydraulic fluid. The radial piston and geroler motors showed less of an improvement. The results of this investigation reveal that high VI fluids increase the torque output of axial piston motors under startup and LSHT conditions.
Recommended Content
Aerospace Standard | Filter Patch Testing Procedures for Aerospace Hydraulic Pumps and Motors |
Ground Vehicle Standard | Marine Vehicles - Hydraulic System Pumps and Motors - Design and Specification Guide |
Ground Vehicle Standard | Assessing Cleanliness of Hydraulic Fluid Power Components and Systems |
Authors
Citation
Michael, P., Burgess, K., Kimball, A., and Wanke, T., "Hydraulic Fluid Efficiency Studies in Low-Speed High-Torque Motors," SAE Technical Paper 2009-01-2848, 2009, https://doi.org/10.4271/2009-01-2848.Also In
References
- Ivantysynova M. Huang C. Investigation of the gap flow in displacement machines considering elastohydrodynamic effect, 5th JHPS International Symposium on Fluid Power, Tokyo, Japan 219 229 2002
- Huang C. Ivantysynova M. A new approach to predict the load carrying ability of the gap between valve plate and cylinder block Bath Workshop on Power transmission and Motion Control, Bath 225 239 2003
- Xie L. Bishop R.J. Totten G.E. Bench and Pump Testing of Hydraulic Fluids Totten [ed.] G.E. Handbook of Hydraulic Fluid Technology. NY : Marcel Dekker 2000
- Shen D. Salant R.F. An unsteady mixed soft EHL model, with application to a rotary lip seal. Tribology International 40 646 651 2007
- Lochte M.D. Cave W. Development of an Updated Brake Chatter Test for Anti-Brake Chatter Transmission/Hydraulic Fluids SAE Off-Highway and Powerplant Congress Paper, Indianapolis, 961817 1996
- Murrenhoff H. Gohler O-C Meindorf T. Hydraulic Fluids. Handbook of Lubrication and Tribology Boca Raton : Taylor and Francis 2006
- Melief H.M. Totten G.E. Hydraulic Fluid Qualification using the Rexroth High-Pressure Piston Pump Test International Exposition for Power Transmission and Technical Conference Chicago NCFP I00-9.2 2000
- Murrenhoff Zhang X. H. The influence of copper catalysts on the oxidation behavior of unsaturated ester lubricants Olehydraulik und Pnumatik 47 3 2003
- Clason D. Iorio F. Burk D. Offutt P. Development and Proof-of-Performance of a New, Long-Life, Multi-viscosity, All-Season Hydraulic Fluid for Off-Highway Equipment International Fluid Power Exposition, Las Vegas: NCFP I05-13.3 2005
- Ohkawa S. Mitsumoto S. Touji Y. et al. Development of New Hydraulic Fluids for Construction Machinery Commercial Vehicle Engineering Congress and Exhibition, Chicago: SAE 2005-01-3574 2005
- Herzog S.N. Neveu C.D. Placek D.G. Influence of Oil Viscosity and Pressure on the Internal Leakage of a Gear Pump. 57th Annual STLE meeting, Houston 2002
- Neveu C.D Cocks R. Hutchinson P. A Study of the Dependence of the Volumetric Efficiency of a Vane Pump on Pressure and Viscosity Proceedings of the Third International Symposium on Fluids and Lubricants, New Delhi, India 2002
- Görlitzer H. Alibert M.J. Herzog S.N. Neveu CD. Dependence of Pump Flow Rate on the Viscosity of High VI Hydraulic Oils Proceeding of the 15th International Colloquium Tribology. Technische Akademie Esslingen Stuttgart 2006
- Michael P.W. Herzog S.N. Hydraulic Fluid Viscosity Selection for Improved Fuel Economy Proceedings of STLE/ASME International Joint Tribology Conference. IJTC Paper 71305 Miami 2008
- Michael P.W. Herzog S.N. Marougy T.E. Fluid Viscosity Selection Criteria for Hydraulic Pumps and Motors International Exposition for Power Transmission and Technical Conference, NCFP I00-9.12 Chicago 2000
- Ivantysynova J. Ivanstysyn M. Hydrostatic Pumps and Motors New Delhi Tech Book International 2003
- Johnson J. Developing a model for motor leakage Hydraulics & Pneumatics 2006 59 11 18 21
- Turnbull D.E. Theoretical Efficiency of a Hydrostatic Transmission 5th International Fluid Power Symposium Cranfield, England 1978
- Merritt H. E. Hydraulic Control Systems NY: John Wiley & Sons 1967
- Surampudi B. Modeling of Low-Speed Characteristics of a Swash-Plate-Type Axial Piston Hydraulic Motor International Exposition for Power Transmission and Technical Conference, NCFP I00-17.1 Chicago 2000
- Oshima S. A Study of the Low Speed Characteristics of a Hydraulic Motor, Proceedings of the 46 National Conference on Fluid Power, Anaheim 1994
- Sauer-Danfoss Series 90 Axial Piston Motors, Technical Information. 520L0604•Rev DA• April 2007 2007
- Bair S. High Pressure Rheology for Quantitative Elastohydrodynamics. Amsterdam Elsevier Science 2007
- Bair S. Michael P. Modeling the Pressure and Temperature Dependence of Viscosity, Proceedings of the STLE/ASME International Joint Tribology Conference: IJTC2008-71028 2008
- International Standards Organization Test Method ISO 4293-1:2002(E) Hydraulic fluid power - Determination of characteristics of motors - Part 1: At constant low speed and constant pressure.
- International Standards Organization Test Method ISO 4293-2:2002(E) Hydraulic fluid power - Determination of characteristics of motors - Part 2: Startability.