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Title:
HYDRAULIC DRIVE FAN CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/059130
Kind Code:
A1
Abstract:
A hydraulic drive fan control device (21) is provided with: a variable capacity type hydraulic pump (2); a hydraulic motor (6) driven by pressure oil from the hydraulic pump (2); a hydraulic drive fan (7) driven by the hydraulic motor (6); a flow rate control valve (8) that changes the flow rate of the pressure oil supplied to the hydraulic motor (6); a rotational speed detector (14) that detects the rotational speed of the engine (4); and a controller (16) that outputs control signals to the hydraulic pump (2) and the flow rate control valve (8) in accordance with the rotational speed of the engine (4). The controller (16) rotates the hydraulic drive fan (7) at a first rotational speed by outputting a first valve control signal to the flow rate control valve (8) and outputting a first pump control signal to the hydraulic pump (2), and stops the rotation of the hydraulic drive fan (7) by outputting a second valve control signal to the flow rate control valve (8) and outputting a second pump control signal to the hydraulic pump (2).

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Inventors:
TANAKA TAKAAKI (JP)
ARAI MASATSUGU (JP)
SATO TAKAYUKI (JP)
FUKUDA NAOKI (JP)
IKEDA JUN (JP)
KOUNO RYUJI (JP)
Application Number:
PCT/JP2018/035141
Publication Date:
March 26, 2020
Filing Date:
September 21, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F15B21/04; E02F9/00; E02F9/22; F04D27/00
Domestic Patent References:
WO2010110059A12010-09-30
WO2015133012A12015-09-11
WO2006028042A12006-03-16
WO2011155309A12011-12-15
WO2006008875A12006-01-26
Foreign References:
JP2005076525A2005-03-24
JP2016169795A2016-09-23
JP2000303838A2000-10-31
JP2009243389A2009-10-22
Other References:
See also references of EP 3674566A4
Attorney, Agent or Firm:
HIROWA PATENT FIRM (JP)
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