CONSTRUCTION MACHINE - KOMATSU MFG CO LTD

Title:

CONSTRUCTION MACHINE

Document Type and Number:

WIPO Patent Application WO/2011/145684

Kind Code:

A1

Abstract:

The disclosed construction machine is provided with: a negative parking brake (4) that releases a braked state by means of the supply of a hydraulic oil; and a parking brake hydraulic circuit (5) that branches from a hydraulic oil supply circuit (6), which supplies hydraulic oil to the transmission of the construction machine, and that supplies hydraulic oil to the parking brake (4). The parking brake hydraulic circuit (5) has: a check valve (72) that prevents backflow of hydraulic oil on the parking brake (4) side to the hydraulic oil supply circuit (6); an operation switching valve (71) that is provided more towards the parking brake (4) than the check valve (72) is and that switches the actuation and release of the parking brake (4); and a relief valve (73) that is provided between the check valve (72) and the operation switching valve (71) and that causes the discharge of hydraulic oil on the parking brake (4) side when the valve is open.

More Like This:

WO/2000/035728	TRAILER AIR BRAKE VALVE
JP2599898	[Name of device] Air actuator

Inventors:

NAITO KEITA (JP)
OKA SHUNJI (JP)
TAKATORI OSAMU (JP)

Application Number:

PCT/JP2011/061527

Publication Date:

November 24, 2011

Filing Date:

May 19, 2011

Export Citation:

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Assignee:

KOMATSU MFG CO LTD (JP)
NAITO KEITA (JP)
OKA SHUNJI (JP)
TAKATORI OSAMU (JP)

International Classes:

B60T13/22; E02F9/22; F16H61/00

Foreign References:

JPS529772A	1977-01-25
JPS5467432U	1979-05-14
JPS57107942A	1982-07-05
JP2005329814A	2005-12-02
JPS5279179A	1977-07-04
JPH02243833A	1990-09-27
JPS63180372U	1988-11-22
JP2005329814A	2005-12-02

Other References: