Cooling apparatus for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaisuke Tokozakura, Kazuya Arakawa, Takahiro Shiina
Life of this patent
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Abstract
A cooling apparatus for a hybrid vehicle is provided with an oil circulating circuit supplying oil discharged from an electric oil pump to a first motor, a second motor, an inverter, and a lubrication-required part, and the oil circulating circuit includes: a first circuit supplying the oil that is discharged from the electric oil pump, and is cooled by an HV radiator to the inverter, the first motor, and the second motor; and a second circuit supplying the oil that is discharged from the electric oil pump without being cooled by the HV radiator to the lubrication-required part.
Claims13
A cooling apparatus for a vehicle, the vehicle including electric motors, an inverter, and a power transmission mechanism, the inverter connected to the electric motors, the power transmission mechanism to transmit power outputted from each of the electric motors to wheels, and the power transmission mechanism including a lubrication-required part, the cooling apparatus comprising:
- an oil pump to discharge oil;
- an oil cooler to cool a first portion of the oil discharged from the oil pump;
- a first circuit to supply the first portion of the oil discharged from the oil pump to the electric motors and the inverter via the oil cooler,
- wherein the first portion of the oil, after being cooled, flows from the oil cooler into an inside of the inverter to directly contact a heat-generating part of the inverter to remove heat, and the oil is an electric insulator;
- and
- a second circuit to supply a second portion of the oil discharged from the oil pump to the lubrication-required part that includes a gear of the power transmission mechanism, wherein the second circuit completely bypasses the oil cooler, the electric motors, and the inverter,
- wherein the first and second circuits return to a same oil reservoir.
A cooling apparatus for a vehicle, the vehicle including electric motors, an inverter, and a power transmission mechanism, the inverter connected to the electric motors, the power transmission mechanism to transmit power outputted from each of the electric motors to wheels, and the power transmission mechanism including a lubrication-required part, the cooling apparatus comprising:
- an oil pump to discharge oil;
- an oil cooler to cool a first portion of the oil discharged from the oil pump;
- a first circuit to supply the first portion of the oil discharged from the oil pump to the electric motors and the inverter via the oil cooler;
- a second circuit to supply a second portion of the oil discharged from the oil pump to the lubrication-required part that includes a gear of the power transmission mechanism, without passing through any oil cooler, wherein the first circuit and the second circuit branch from each other at a branch point between the oil pump and the oil cooler and the second circuit completely bypasses the oil cooler, the electric motor, and the inverter;
- and
- a flow rate control valve disposed at the branch point, the flow rate control valve and the oil pump regulate a distribution flow rate into the first circuit and the second circuit, wherein the flow rate control valve includes a first discharge port distributing oil into the first circuit and a second discharge port distributing oil into the second circuit.
Dependencies are inferred from the claim text.