Variable displacement vane pump with variable target regulator
First Claim
1. A lubricant pumping system for providing lubrication of an apparatus having a variable speed rotating shaft and an oil pressure circuit comprising:
- a first pump having a variable displacement capability which is variably adjustable in response to a control input; and
a second fixed displacement pump operably connected to said variable speed rotating shaft, an output said second pump providing an actuation signal proportional to the speed of said variable speed rotating shaft, for varying the displacement of said first pump in response to the speed of said variable speed rotating shaft;
wherein a portion of the output of said second pump is operable to be directed to an intake of said first pump for supercharging an input flow;
wherein a portion of an output of said second pump is operable to be directed to a discharge of said first pump;
wherein a portion of said output of said second pump is operable to be directed to an oil sump.
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Accused Products
Abstract
A variable displacement vane-type fluid pump is provided which permits improved regulation of the pump discharge such that the pump can meet the various requirements of lubrication for internal combustion engines at all speeds with minimized use of power. Of course, the vane pump may also be utilized in a wide range of power transmission and other fluid distribution applications. The vane pump of the invention may also use both hydrostatic and mechanical actuators to control the position of its containment ring or eccentric ring and hence, regulate the output of the pump. According to yet another aspect of the present invention, to prevent inlet flow restriction or cavitation, a valve may be provided to permit some of the pump outlet or discharge flow to bleed into the pump inlet to provide needed velocity energy to the fluid flow into the pump inlet. A system for lubrication of an engine using a fixed displacement pump for providing an engine speed input for controlling a second main variable displacement type oil pump and maintaining a target oil pressure in the oil pressure circuit.
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Citations
31 Claims
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1. A lubricant pumping system for providing lubrication of an apparatus having a variable speed rotating shaft and an oil pressure circuit comprising:
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a first pump having a variable displacement capability which is variably adjustable in response to a control input; and
a second fixed displacement pump operably connected to said variable speed rotating shaft, an output said second pump providing an actuation signal proportional to the speed of said variable speed rotating shaft, for varying the displacement of said first pump in response to the speed of said variable speed rotating shaft;
wherein a portion of the output of said second pump is operable to be directed to an intake of said first pump for supercharging an input flow;
wherein a portion of an output of said second pump is operable to be directed to a discharge of said first pump;
wherein a portion of said output of said second pump is operable to be directed to an oil sump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A lubricant pumping system for providing lubrication of an apparatus having a variable speed rotating shaft and an oil pressure circuit comprising:
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a first pump having a variable displacement capability which is variably adjustable in response to a control input; and
a second fixed displacement pump operably connected to said variable speed rotating shaft, an output of said second pump providing an actuation signal characteristic of a speed of said variable speed rotating shaft for varying the displacement of said first pump in response to the speed of said variable speed rotating shaft;
wherein said first pump is a variable displacement vane pump with an eccentric ring for varying the displacement thereof in response to said control input;
wherein said output of said second pump has a calibrated fixed flow orifice for providing a calibrated pressure signal proportional to the second pump drive speed as said control input. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification