Hydraulic pressure supply system of automatic transmission

Patent metadata

Field	Value
Publication number	US-9863528-B2
Application number	US-201615178899-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Dec 10, 2015
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A hydraulic pressure supply system of an automatic transmission may include a mechanical oil pump driven by an engine to supply the oil stored in the oil pan to a first supply path fluidly-connected to the mechanical oil pump, a switch valve fluidly-connected to the first supply path and selectively supplying oil supplied from the first supply path to the transmission unit through a second supply path fluidly-connected to the switch valve and the transmission unit, a solenoid valve actuator engaged to the switch valve, and an electrical oil pump fluidly connected to the oil pan to pump the oil stored in the oil pan as a second high-pressure hydraulic pressure and supply the oil in the pan to a third supply path fluidly-connected with the second supply path, wherein the first and second hydraulic pressures may be applied to the transmission unit through three operation modes.

First claim

What is claimed is:

1. A hydraulic pressure supply system of an automatic transmission for a vehicle, generating high-pressure hydraulic pressure from oil stored in an oil pan and supplying the hydraulic pressure to a transmission unit, including:
a mechanical oil pump driven by an engine to pump the oil stored in the oil pan as a first high-pressure hydraulic pressure and to supply the oil stored in the oil pan to a first supply path fluidly-connected to the mechanical oil pump;
a switch valve fluidly-connected to the first supply path and selectively supplying oil supplied from the first supply path to the transmission unit through a second supply path fluidly-connected to the switch valve and the transmission unit,
a solenoid valve actuator engaged to the switch valve and configured to be turned on/off to control the switch valve; and
an electrical oil pump fluidly connected to the oil pan and engaged to and driven by an electrical motor to pump the oil stored in the oil pan as a second high-pressure hydraulic pressure and supply oil in the electrical oil pump to a third supply path fluidly-connected with the second supply path,
wherein the first and second hydraulic pressures are applied to the transmission unit through three operation modes.

2. The hydraulic pressure supply system of claim 1 , wherein a recirculation path is fluidly-connected to the switch valve, the oil pan, the mechanical oil pump, and the electrical oil pump.

3. The hydraulic pressure supply system of claim 2 , wherein the switch valve is provided as a spool valve, and is fluidly-connected to the first supply path of the mechanical oil pump and selectively supplies oil supplied to the first supply path to the second supply path and the recirculation path depending on a turn-on or turn-off state of the solenoid valve actuator.

4. The hydraulic pressure supply system of claim 1 , wherein a check valve preventing back flow is provided on the third supply path.

5. The hydraulic pressure supply system of claim 1 , wherein the three operation modes include:
a first operation mode in which only the first hydraulic pressure of the mechanical oil pump is applied to the transmission unit;
a second operation mode in which only the second hydraulic pressure of the electrical oil pump is applied to the transmission unit; and
a third operation mode in which the first and second hydraulic pressures of the mechanical oil pump and the electrical oil pump are supplied to the transmission unit.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Hwang Jin Young

Classifications

• F16H61/0267

  Layout of hydraulic control circuits, e.g. arrangement of valves · CPC title

• F16H61/0031 Primary

  using auxiliary pumps, e.g. pump driven by a different power source than the engine · CPC title

• F16H61/0206

  Layout of electro-hydraulic control circuits, e.g. arrangement of valves · CPC title

• F16H57/0434 Primary

  relating to lubrication supply, e.g. pumps; Pressure control · CPC title

• F16H61/2807

  using electric control signals for shift actuators, e.g. electro-hydraulic control therefor  (F16H61/30, F16H61/32 take precedence) · CPC title