Title:
HYDRAULIC CLOSED CIRCUIT SYSTEM
Document Type and Number:
WIPO Patent Application WO/2013/115140
Kind Code:
A1
Abstract:
In a hydraulic closed circuit employing a single rod type hydraulic cylinder, delayed response of the flushing valve, and hunting of the flushing valve due to pressure pulsations of the circuit, are prevented, preventing diminished operability of the hydraulic cylinder. The hydraulic closed circuit system (10) is provided with: an electrical motor (12); a hydraulic pump (13) driven by the electrical motor (12) and able to discharge in both directions; a single rod type hydraulic cylinder (11) connected to the hydraulic pump (13) via pipe lines (17, 18); a flushing valve (16) connected between the pipe lines (17, 18) and a tank (30); and a control device (22) for adding a predetermined control parameter to the pressure of the pipe line on the low-pressure side of the pipe lines (17, 18), comparing the relative magnitude of the corrected pressure to which the control parameter has been added, to the pressure of the pipe line on the high-pressure side, and switching the flushing valve (16) when the relative magnitude of the pressures has reversed.
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Inventors:
SADAMORI HIROYUKI (JP)
SHIMIZU JURI (JP)
SAITOH TEPPEI (JP)
HIRAKU KENJI (JP)
MIZUOCHI MARIKO (JP)
SHIMIZU JURI (JP)
SAITOH TEPPEI (JP)
HIRAKU KENJI (JP)
MIZUOCHI MARIKO (JP)
Application Number:
PCT/JP2013/051788
Publication Date:
August 08, 2013
Filing Date:
January 28, 2013
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
F15B11/08; E02F9/22; F15B11/04
Foreign References:
| JPS60139902A | 1985-07-24 | |||
| JPS6081502A | 1985-05-09 | |||
| JPH04290604A | 1992-10-15 | |||
| JP2002021807A | 2002-01-23 |
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
Kasuga 讓 (JP)
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Claims: