Hydraulic pressure supply system of automatic transmission

Patent metadata

Field	Value
Publication number	US-9494231-B2
Application number	US-201414562329-A
Country	US
Kind code	B2
Filing date	Dec 5, 2014
Priority date	Jul 1, 2014
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

A hydraulic pressure supply system of an automatic transmission may include a low-pressure oil pump generating low hydraulic pressure while being driven by an engine to exhaust the low hydraulic pressure to a first low-pressure channel, a high-pressure oil pump raising a portion of the hydraulic pressure in the first low-pressure channel to a high pressure while being driven by an electric motor to exhaust the hydraulic pressure to a first high-pressure channel, a low-pressure regulator valve controlling the hydraulic pressure while exhausting a portion of the hydraulic pressure to supply the controlled hydraulic pressure to a low-pressure part through a second low-pressure channel, and a high-pressure regulator valve controlling the hydraulic pressure while re-circulating a portion of the hydraulic pressure to the low-pressure part through single or two re-circulation channels according to the pressure to supply the controlled hydraulic pressure to a high-pressure part through the second high-pressure channel.

First claim

What is claimed is:

1. A hydraulic pressure supply system of an automatic transmission, the hydraulic pressure supply system comprising:
a low-pressure oil pump generating low hydraulic pressure from oil stored in an oil pan while being driven by an engine to exhaust a generated low hydraulic pressure to a first low-pressure channel;
a high-pressure oil pump raising a portion of the generated low hydraulic pressure in the first low-pressure channel to a high hydraulic pressure while being driven by an electric motor to exhaust a raised hydraulic pressure to a first high-pressure channel;
a low-pressure regulator valve controlling the generated low hydraulic pressure while exhausting a portion of the generated low hydraulic pressure supplied through the first low-pressure channel to supply a controlled hydraulic pressure to a low-pressure part through a second low-pressure channel; and a high-pressure regulator valve controlling the raised high hydraulic pressure while re-circulating a portion of the raised high hydraulic pressure supplied through the first high-pressure channel to the low-pressure part through a single re-circulation channel or two re-circulation channels according to at least a control pressure to supply a controlled hydraulic pressure to a high-pressure part through a second high-pressure channel;
wherein the high-pressure regulator valve includes:
a valve body including:
a first port supplied with the raised high hydraulic pressure from the first high-pressure channel;
a second port supplying the raised high hydraulic pressure supplied to the first port to the second high-pressure channel;
a third port supplying a portion of the raised high hydraulic pressure supplied to the first port to a first re-circulation channel of the two re-circulation channels;
a fourth port supplying a portion of the raised high hydraulic pressure supplied to the first port to a second re-circulation channel of the two re-circulation channels;
a fifth port supplied with a portion of the raised high hydraulic pressure supplied to the second port as a first control pressure of the at least a control pressure; and
a sixth port positioned at a portion of the valve body opposite to the fifth port to be supplied with a second control pressure of the at least a control pressure, wherein the second control pressure is generated by a solenoid value; and

a valve spool including:
a first land on which the first control pressure supplied to the fifth port acts;
a second land controlling an open area of the third port;
a third land controlling open areas of the first and second ports and the third port;
a fourth land controlling open areas of the first and second ports and the fourth port; and
a fifth land on which the second control pressure supplied to the sixth port acts.

2. The hydraulic pressure supply system of claim 1 , wherein the first re-circulation channel connects the third port of the high-pressure regulator valve and the first low-pressure channel and includes an orifice disposed on the first re-circulation channel, and the second re-circulation channel connects the fourth port of the high-pressure regulator valve and the second low-pressure channel.

3. The hydraulic pressure supply system of claim 2 , wherein a pressure sensor is provided on the first re-circulation channel between the orifice and the high-pressure regulator valve.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Son Hyunjun
• Jo Sehwan

Classifications

• F16K11/06

  comprising only sliding valves {, i.e. sliding closure elements} · CPC title

• G05D16/2013

  using throttling means as controlling means · CPC title

• F16H61/0276

  Elements specially adapted for hydraulic control units, e.g. valves · CPC title

• F16H2061/0037

  characterised by controlled fluid supply to lubrication circuits of the gearing · CPC title

• F16H61/0031 Primary

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