Title:
HYDRAULIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/089130
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing, in a return oil passage that returns operating oil from hydraulic actuators to an operating oil tank, a bypass oil passage that bypasses an oil cooler, and of enabling the operating oil to flow to the oil cooler when the operating oil exceeds a preset temperature. In a hydraulic circuit (20) wherein an oil cooler (41) that cools operating oil is provided in a return oil passage (40) that returns the operating oil from hydraulic actuators (5R/5L/7/13/14/15/16/18) to an operating oil tank (19), a bypass oil passage (43) that bypasses the oil cooler (41), and a switch valve (42) that causes the operating oil to flow to the oil cooler (41) when the operating oil exceeds a preset temperature, are provided in the return oil passage (40).
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Inventors:
SAKAMOTO KUNIHIKO (JP)
Application Number:
PCT/JP2012/082176
Publication Date:
June 20, 2013
Filing Date:
December 12, 2012
Export Citation:
Assignee:
YANMAR CO LTD (JP)
International Classes:
E02F9/24; F15B21/0427; F15B21/0423; F16K31/68
Foreign References:
| JP2001132710A | 2001-05-18 | |||
| JPH09177723A | 1997-07-11 | |||
| JPH10274211A | 1998-10-13 | |||
| JPH04151377A | 1992-05-25 | |||
| JPH07334248A | 1995-12-22 | |||
| JPH1182427A | 1999-03-26 | |||
| JPS53163493U | 1978-12-21 | |||
| JP2007211843A | 2007-08-23 | |||
| JP2006161907A | 2006-06-22 |
Attorney, Agent or Firm:
YANO Juichiro (JP)
Juichiro Yano (JP)
Juichiro Yano (JP)
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Claims: