Title:
HYDRAULIC DRIVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2013/027620
Kind Code:
A1
Abstract:
In this hydraulic drive system (1), a hydraulic-oil path (15) forms a closed circuit between a hydraulic pump (10) and a hydraulic cylinder (14). When the hydraulic pump (10) supplies a hydraulic oil to the hydraulic cylinder (14) via a flow control valve (16), a direction control valve (44) allows the hydraulic fluid to flow from the hydraulic pump (10) to the hydraulic cylinder (14) but prohibits the hydraulic fluid from flowing from the hydraulic cylinder (14) to the hydraulic pump (10). When a target flow rate is within a prescribed range, a control device (24) uses the flow control valve (16) to control the flow rate of the hydraulic fluid being supplied to the hydraulic cylinder (14), and when the target flow rate is above the aforementioned prescribed range, the control device (24) uses a pump-flow-rate control unit (25) to control the flow rate of the hydraulic fluid being supplied to the hydraulic cylinder (14).
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| JP5380240 | Work machine hydraulic drive |
| JP2008286264 | HYDRAULIC CONTROL DEVICE |
Inventors:
AKIYAMA TERUO (JP)
IIDA NOBORU (JP)
SAITO KOJI (JP)
WATANABE TAKAYUKI (JP)
YAMASHITA KOJI (JP)
IIDA NOBORU (JP)
SAITO KOJI (JP)
WATANABE TAKAYUKI (JP)
YAMASHITA KOJI (JP)
Application Number:
PCT/JP2012/070603
Publication Date:
February 28, 2013
Filing Date:
August 13, 2012
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
AKIYAMA TERUO (JP)
IIDA NOBORU (JP)
SAITO KOJI (JP)
WATANABE TAKAYUKI (JP)
YAMASHITA KOJI (JP)
AKIYAMA TERUO (JP)
IIDA NOBORU (JP)
SAITO KOJI (JP)
WATANABE TAKAYUKI (JP)
YAMASHITA KOJI (JP)
International Classes:
F15B11/02; E02F9/22; F15B11/08
Foreign References:
| JP2009121649A | 2009-06-04 | |||
| JPH09208187A | 1997-08-12 | |||
| JPS5843537B2 | 1983-09-27 |
Attorney, Agent or Firm:
Shinjyu Global IP (JP)
fresh green -- a global IP patent business corporation (JP)
fresh green -- a global IP patent business corporation (JP)
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Claims: