The importance of suction port timing in axial piston pumps
2005 (English)In: Proc. of the 9th Scandinavian International Conference on Fluid Power, (SICFP '05) / [ed] Palmberg, Jan-Ove, Linköping: Linköping Universitet, Institute of Technology , 2005, 32- p.Conference paper (Refereed)
Hydraulic pumps give rise to flow ripples in both discharge and suction lines. The flow pulsations transform into pressure ripples which in turn create vibration and audible noise. With a careful design of the valve plate timing, flow ripple can be minimised. Much research is dedicated to the design of discharge port commutation, i.e. the pre-compression dynamics. This work, however, focuses on the suction port timing.
Besides controlling flow ripple in the tank line, suction port timing influences fluid air-release which in turn has substantial impact on the effective system bulk modulus. lncreased air-release implies reduced cylinder filling performance, reduced volumetric efficiency and increased flow pulsations. In addition, the cylinder decompression at suction port commutation directly affects the resulting piston force profile and internal bending moments which largely contributes to pump housing vibration and noise emissions. Thus. the design of the suction port timing is crucial for flow ripples, air-release, pump housing vibrations and direct noise emissions from the pump. Also. the risk for cavitation is controlled.
This paper also investigates the efficiency of an Air Drain Groove, ADC, as an alternative to conventional pressure relief grooves at suction port commutation. Correctly designed, the ADG reduces the cylinder pressure at piston top dead centre by bleeding off a very small amount of cylinder fluid to the housing drain. The air-release hereby obtained is directed into the pump casing instead of into the suction port and should thereby give rise to a higher system bulk modulus. Experiments reveal, however, that the efficiency of the ADC is not preferable to a conventional pressure relief groove, neither regarding air-release, nor noise emissions.
Place, publisher, year, edition, pages
Linköping: Linköping Universitet, Institute of Technology , 2005. 32- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-31417Local ID: 17195ISBN: 9185457965ISBN: 9789185457960OAI: oai:DiVA.org:liu-31417DiVA: diva2:252240
The 9th International Conference on Fluid Powers, SICFP'05, July 1-3, Linköping, Sweden