Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE, PROVIDED WITH PROTECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/129676
Kind Code:
A1
Abstract:
Disclosed is a hydraulic system for a construction machine, provided with a protection device, wherein a flow rate discharged from a hydraulic pump is controlled according to oil temperature and a driver can be informed of the information on the oil temperature. According to the present invention, provided is a hydraulic system for a construction machine, provided with a protection device, comprising: a hydraulic actuator operated by using hydraulic oil supplied from a hydraulic pump; a control valve provided to a path between the hydraulic pump and the hydraulic actuator and controlling the flow rate supplied from the hydraulic pump to the hydraulic actuator; an oil cooler provided to a return path from the control valve to a hydraulic oil tank and cooling the hydraulic oil; an oil temperature sensor for detecting the oil temperature of the hydraulic oil tank in real time; a hydraulic pump regulator for controlling the discharge flow rate of the hydraulic pump by adjusting the swivel angle of the swash plate of the hydraulic pump; and a controller for comparing the oil temperature detected by the oil temperature sensor and preset oil temperatures and outputting a control signal to the hydraulic pump regulator so as to restrain the discharge flow rate of the hydraulic pump to a preset flow rate or less, if the detected oil temperature is equal to or lower than a preset low limit value or equal to or higher than a preset high limit value.
Inventors:
JOUNG HEA-GYOON (KR)
KIM SUNG-GON (KR)
KIM SUNG-GON (KR)
Application Number:
PCT/KR2013/001286
Publication Date:
August 28, 2014
Filing Date:
February 19, 2013
Export Citation:
Assignee:
VOLVO CONSTR EQUIP AB (SE)
JOUNG HEA-GYOON (KR)
KIM SUNG-GON (KR)
JOUNG HEA-GYOON (KR)
KIM SUNG-GON (KR)
International Classes:
F15B20/00; E02F9/22; F15B13/02
Foreign References:
| JP2001041204A | 2001-02-13 | |||
| JP2002364603A | 2002-12-18 | |||
| JPH05280070A | 1993-10-26 | |||
| JPH09177724A | 1997-07-11 | |||
| JP2010270647A | 2010-12-02 |
Other References:
See also references of EP 2960529A4
None
None
Attorney, Agent or Firm:
YOON, Eui-Seoup (KR)
윤의섭 (KR)
윤의섭 (KR)
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