Title:
HIGH-SPEED AND HIGH-LOAD CYLINDER DEVICE
Document Type and Number:
WIPO Patent Application WO/1994/011639
Kind Code:
A1
Abstract:
A high-speed and high-load cylinder device wherein a hydraulic circuit for supplying a high-speed cylinder and a pressurizing cylinder with oil pressure by connecting a piston of the high-speed cylinder (1) having a small pressure receiving area to a piston (2) of the pressurizing cylinder having a large pressure receiving area via a piston rod, said high-speed and high-load cylinder device being characterized in that a sequence valve (5) for opening and/or closing a passageway (2e) provided in the piston of said pressurizing cylinder with a pilot pressure is provided in the passageway for setting communication between an upper chamber (21) and a lower chamber (22) of the pressurizing cylinder, that a pilot pressure circuit is provided for supplying said sequence valve with a pilot pressure to thereby close said sequence valve, and that a high-speed and pressurizing switching valve (12) is provided in a pipe line (11) of said hydraulic circuits which supplies an oil pressure to said upper chamber of said pressurizing cylinder, whereby when a high-speed operation is required, a pilot pressure is not supplied to said sequence valve (5) with said high-speed and pressurizing switching valve (12) being closed, while when a large pressurization is required, a pilot pressure is supplied to said sequence valve (5) with said high-speed and pressurizing valve (12) being opened. With this arrangement, it is possible to provide operations meeting high-speed and high-load requirements without any external piping.
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Inventors:
SAWAMURA HITOSHI (JP)
Application Number:
PCT/JP1993/001497
Publication Date:
May 26, 1994
Filing Date:
October 18, 1993
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
SAWAMURA HITOSHI (JP)
SAWAMURA HITOSHI (JP)
International Classes:
B30B1/32; B30B15/16; B30B15/20; B21D28/20; B30B15/22; F15B11/02; F15B13/04; (IPC1-7): F15B11/02; F15B15/14; B30B1/32
Foreign References:
| JPS6367404A | 1988-03-26 | |||
| JPS4731075A |
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