Variable displacement variable pressure vane pump system
AssigneeMAGNA Powertrain AG & Co KG
InventorsCezar Tanasuca, David R. Shulver
Life of this patent
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Abstract
A variable displacement variable pressure vane pump system provides lubrication oil to a mechanical system. The pump system includes a first control mechanism to apply a force to a control slider to counter a biasing force of a biasing spring and urge the control slider away from a position corresponding to a maximum displacement position of the pump. A second control mechanism applies a force to the control slider to alter the displacement of the pump. A control varies the supply of lubrication oil to the second control mechanism to alter the output of the pump to closely correspond to the lubrication requirements of the mechanical system.
Claims14
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.
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;
- and
- 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, further comprising 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 further operable to vary the supply of lubrication oil between 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 and wherein the second control mechanism and the third control mechanism create different magnitudes of force for a given pressure of lubrication oil.
Dependencies are inferred from the claim text.