Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
HYDRAULIC SYSTEM
Document Type and Number:
Japanese Patent JP2008051292
Kind Code:
A
Abstract:

To provide a hydraulic system which can inexpensively and quickly detect the temperature of oil without using a temperature sensor, and can quickly perform the temperature rise control.

A temperature rise control means 25 compares the electric current detected by an electric current detecting means 26 with the reference electric current stored beforehand in the idling state at a start or in the pressure holding state of a hydraulic cylinder 5. When the detected electric current is larger than the reference electric current, the temperature-rise control means 25 closes the portion between a pump port P and a first load port A by positioning an electromagnetic selector valve 2 to a neutral position S0, and also controls a hydraulic pump 1 via a motor 15 so as to open a relief valve 11. Thus, the temperature-rise control can be inexpensively and quickly performed by estimating the temperature of oil by the electric current without using a temperature sensor.


Inventors:
NAKADA TETSUO
YANAGIDA YASUTO
Application Number:
JP2006000230292
Publication Date:
March 06, 2008
Filing Date:
August 28, 2006
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DAIKIN IND LTD
International Classes:
F15B21/04
Domestic Patent References:
JPS63171707A1988-07-15
JPS6217407A1987-01-26
Attorney, Agent or Firm:
山崎 宏
前田 厚司