PRESSURE INCREASING DEVICE FOR HIGH LIFT WORK VEHICLE

Japanese Patent JP2017227253

A

PROBLEM TO BE SOLVED: To provide a pressure increasing device capable of selecting one mode from a plurality of modes and keeping the maximum pressure of working oil fed to a hydraulic tool constant even if an amount of working oil fed out by a working oil pump varies.SOLUTION: A pressure increasing device 12 for a high lift work vehicle 1 in which a mode selection part 41 is provided, comprises: a pressure sensor 14 for detecting a pressure of working oil fed to a hydraulic tool (100); and a controller 31 for controlling a solenoid changing-over valve 24 while recognizing pressure transition of the working oil on the basis of a signal from the pressure sensor 14. The controller 31 sets a threshold Pa in response to a selection state of the mode selection part 41, controls the solenoid changing-over valve 24 so as to change-over from a state in which the working oil is guided to a pressure increasing oil passage 26 to a state in which the working oil is guided to a pressure decreasing oil passage 25 when determining the pressure of the working oil to exceed the threshold Pa .SELECTED DRAWING: Figure 2

MIKI TOSHIHIKO
KAWAI KIYOTAKA
MATSUMOTO TAKUYA
ASO YOSHINARI

JP2016123083A

December 28, 2017

June 21, 2016

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TADANO LTD

F15B11/028; B66F9/22; B66F11/04; F15B3/00; F15B11/00; F15B21/04; H02G1/02

JP2014020543A	2014-02-03
JP2014159851A	2014-09-04
JP2012219653A	2012-11-12
JP2009281413A	2009-12-03
JP2008180274A	2008-08-07
JPH0477598U	1992-07-07
JPH06173903A	1994-06-21
JPS5712471U	1982-01-22
JP2012013203A	2012-01-19
JP2009019689A	2009-01-29
JP2017223336A	2017-12-21
JP2016188664A	2016-11-04
JP2011179541A	2011-09-15
JP2011163291A	2011-08-25
JP2009008194A	2009-01-15
JPH03125800U	1991-12-19

Yanouchi Foreign Patent Office

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