CONTROL DEVICE FOR HYDRAULIC CYLINDER

WIPO Patent Application WO/2004/085854

A1

A control device for a hydraulic cylinder has cushioning chambers (8) that are provided near both ends of a hydraulic cylinder (1) and restrict the inflow or outflow of a hydraulic oil as a piston (5) approaches each end of its stroke, and a control valve (13) provided in passages for feeding the hydraulic oil to or discharging it from oil chambers (6, 7) of the hydraulic cylinder (1). In stroke end regions of the piston, the opening degree of the control valve (13) is varied by a controller (9) based on output from pressure sensors (16, 17), so that a cushioning pressure is regulated to control the moving speed of the piston (5). The structure enables a deceleration rate of the piston (5) to be freely regulated in varied manners in its stroke end regions in accordance with working conditions of the hydraulic cylinder.

JP2005061041	HYDRAULIC EXCAVATOR
JPH11100868	POSITIONING DEVICE AND METHOD FOR EXCAVATOR HOUSING

KOBATA HIROSHI (JP)
KOLBE CHRISTOPHER JOHN (US)

PCT/JP2004/004278

October 07, 2004

March 26, 2004

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KAYABA INDUSTRY CO LTD (JP)
HUSCO INTERNAT (US)
KOBATA HIROSHI (JP)
KOLBE CHRISTOPHER JOHN (US)

E02F9/22; F15B11/00; F15B11/048; F15B15/22; (IPC1-7): F15B11/00

JPH11325294A	1999-11-26
JPS61153003A	1986-07-11
JPS581803U	1983-01-07
JPH05196004A	1993-08-06
JPH0272201A	1990-03-12
JPH11108014A	1999-04-20
JP3138028B2	2001-02-26
JPS6388304A	1988-04-19
JPH06330907A	1994-11-29
JPH04303392A	1992-10-27
JP2000120603A	2000-04-25
JPS50125182A	1975-10-01

Goto, Masaki (3-1 Kasumigaseki 3-chom, Chiyoda-ku Tokyo 13, JP)

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