Oil supply system for vehicle
First Claim
1. An oil supply system for a vehicle, comprising:
- a mechanical oil pump that is driven by an engine;
an electric oil pump that is driven by an electric motor;
a hydraulic pressure control circuit that is supplied with oil from the mechanical oil pump and the electric oil pump through an oil discharge passage for the mechanical oil pump and an oil discharge passage for the electric oil pump, the oil discharge passage for the mechanical oil pump and the oil discharge passage for the electric oil pump being connected to each other at a junction point upstream of the hydraulic pressure control circuit;
a lubrication/cooling oil passage that is supplied with the oil from the hydraulic pressure control circuit; and
a communication passage that branches off from the lubrication/cooling oil passage and that is supplied with the oil from the electric oil pump via the hydraulic pressure control circuit, the communication passage providing communication between the lubrication/cooling oil passage and the mechanical oil pump,wherein a pump-side port of the communication passage is connected to an oil intake passage for the mechanical oil pump, at a position close to an inlet port of the mechanical oil pump.
1 Assignment
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Accused Products
Abstract
An oil supply system for a vehicle includes: a mechanical oil pump driven by an engine; an electric oil pump driven by an electric motor; a hydraulic pressure control circuit supplied with oil from the mechanical oil pump and the electric oil pump through an oil discharge passage for the mechanical oil pump and an oil discharge passage for the electric oil pump, which are connected to each other; a lubrication/cooling oil passage that is supplied with the oil from the hydraulic pressure control circuit; and a communication passage that provides communication between the lubrication/cooling oil passage and the mechanical oil pump. With this oil supply system, it is possible to prevent the electric oil pump from causing air-sucking noise, for example, in the motor-power cruise mode, and to improve the rising characteristics of the hydraulic pressure produced by the mechanical oil pump during startup of the engine.
39 Citations
12 Claims
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1. An oil supply system for a vehicle, comprising:
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a mechanical oil pump that is driven by an engine; an electric oil pump that is driven by an electric motor; a hydraulic pressure control circuit that is supplied with oil from the mechanical oil pump and the electric oil pump through an oil discharge passage for the mechanical oil pump and an oil discharge passage for the electric oil pump, the oil discharge passage for the mechanical oil pump and the oil discharge passage for the electric oil pump being connected to each other at a junction point upstream of the hydraulic pressure control circuit; a lubrication/cooling oil passage that is supplied with the oil from the hydraulic pressure control circuit; and a communication passage that branches off from the lubrication/cooling oil passage and that is supplied with the oil from the electric oil pump via the hydraulic pressure control circuit, the communication passage providing communication between the lubrication/cooling oil passage and the mechanical oil pump, wherein a pump-side port of the communication passage is connected to an oil intake passage for the mechanical oil pump, at a position close to an inlet port of the mechanical oil pump. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 12)
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6. An oil supply system for a vehicle, comprising:
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a mechanical oil pump that is driven by an engine; an electric oil pump that is driven by an electric motor; a hydraulic pressure control circuit that is supplied with oil from the mechanical oil pump and the electric oil pump through an oil discharge passage for the mechanical oil pump and an oil discharge passage for the electric oil pump, the oil discharge passage for the mechanical oil pump and the oil discharge passage for the electric oil pump being connected to each other at a junction point upstream of the hydraulic pressure control circuit; a lubrication/cooling oil passage that is supplied with the oil from the hydraulic pressure control circuit; and a communication passage that branches off from the lubrication/cooling oil passage and that is supplied with the oil from the electric oil pump via the hydraulic pressure control circuit, the communication passage providing communication between the lubrication/cooling oil passage and the mechanical oil pump, wherein a pump-side port of the communication passage is directly connected to an oil intake hole formed in the mechanical oil pump.
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Specification