Patent ID: 7674095
Filing Date: 2010-03-09
Classification: F01C,F01M,F04C,F16N

Abstract:
1. A lubricant pumping system for providing lubrication of an apparatus having a variable speed rotating shaft and an oil pressure circuit, comprising: a variable displacement pump which is variably adjustable in response to a control input; a fixed displacement pump operably connected to said variable speed rotating shaft, the output of said fixed displacement pump providing an actuation signal characteristic of a speed of said shaft for varying the displacement of said variable displacement pump in response to the speed of said shaft; a controllable valve for varying the resistance to the output of said fixed displacement pump for selectively adjusting the actuating signal characteristic of said fixed displacement pump; and wherein at least a portion of the output of said variable displacement pump is in fluid communication with the input of said fixed displacement pump; a first control piston is positioned in a bore, said bore being in fluid communication with said fixed displacement pump, said first control piston being positioned in said bore on a first side by a pressure from said control input and on a second side by a grounded spring, the position of said first control piston in said bore acting as a reference for the regulation system to provide a predetermined regulation target pressure in said oil pressure circuit.