Product category:
OEM Pumps
News Release from: Concentric | Subject: VFP oil pump
Edited by the Engineeringtalk Editorial
Team on 04 March 2005
Variable flow oil pump saves energy
An novel variable flow oil pump uses significantly less power than fixed flow units, providing immediate fuel savings as well as offering the potential for a more energy-efficient oil system.
Concentric has developed an innovative variable flow oil pump (VFP) for automotive engines which uses significantly less power than conventional fixed flow pumps, providing immediate fuel savings as well as offering the potential for a more energy-efficient oil system Originally developed for heavy-duty diesel engines Concentric's VFP oil pump is attracting interest for medium and light duty diesels, gasoline engines and passenger car applications because of its efficiency, durability and infinite variability
This article was originally published on Engineeringtalk on 17 Mar 2003 at 8.00am (UK)
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Unlike other variable flow pumps that offer only a choice between two fixed rates of flow, Concentric's infinitely variable design reduces parasitic losses by taking advantage of the differing oil requirements for each point in the operating cycle.
The VFP pump was designed to combine low cost and robustness with fuel savings of around 1%.
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Variable flow oil pump promises fuel savings
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Concentric has already demonstrated savings for heavy-duty diesel engines of between 3 and 4hp at rated speed and more than 1hp at cruise speed.
In a typical light duty cycle, many engines do not reach a stable 80C for long periods and the regulating valve can operate prematurely, providing the opportunity for further energy saving.
Additional benefits can be achieved if the oil system is optimised enabling the pump to provide only the pressure necessary at any point in the operating range.
The new VFP pump derives from the variable flow design pioneered by Concentric over a decade ago.
Its principle is to align flow to demand, so limiting the power needed to drive the pump and hence fuel consumption.
Two inner rotors within a single outer control flow output.
The driving rotor operates in the traditional, fixed arrangement while the offset position and resultant flow of the second, eccentrically mounted rotor can be controlled mechanically by a rack and pinion or via electronic management.
Concentric engineers made extensive use of CFD (computational fluid dynamics) techniques to refine the internal geometry of the VFP pump and, as a result, were able to eliminate a number of problems associated with other designs.
Low pulsing and high efficiency have been achieved by optimising the design of the ports.
At the same time, internal loadings have been so reduced that no special materials or heat treatments are required.
The result is an exceptionally cost-effective as well as robust and efficient pump.
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