Patent ID: 8444395
Filing Date: 2013-05-21
Classification: F01M,F04C,F16N

Abstract:
1. A variable displacement variable pressure vane pump system for providing lubrication oil to a mechanical system comprises: a variable displacement variable pressure vane pump having a control slider which is moveable to alter the displacement of the pump; a biasing means to bias the control slider towards a position corresponding to the maximum displacement position of the pump; a first control mechanism responsive to the pressure of the lubrication oil output from the pump to apply a force to the control slider to counter a biasing force of the biasing means and to urge the control slider away from the position corresponding to the maximum displacement position of the pump; a second control mechanism responsive to the pressure of the lubrication oil output from the pump to apply a force to the control slider to alter the displacement of the pump; a control means operable to vary the lubrication oil supplied to the second control mechanism to alter the output of the pump to closely correspond to the lubrication requirements of the mechanical system; and a third control mechanism responsive to the pressure of the lubrication oil output from the pump to apply a force to the control slider to counter the biasing force of the biasing means and to urge the control slider away from the position corresponding to the maximum displacement position of the pump and wherein the control means is operable to vary lubrication oil output from either or both of the second control mechanism and the third control mechanism to alter the output of the pump to closely correspond to the lubrication requirements of the mechanical system.