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Title:
HYDRAULIC DRIVING DEVICE
Document Type and Number:
Japanese Patent JP2020020421
Kind Code:
A
Abstract:
To provide a hydraulic driving device capable of accurately measuring a leakage flow rate of a hydraulic pump regardless of a level of a leakage flow rate of a relief valve.SOLUTION: A controller 30 holds a discharge flow rate of a first hydraulic pump 12a at the time when a discharge pressure of the first hydraulic pump reaches a specific pressure, as a first pump theoretical flow rate, holds a discharge flow rate of a second hydraulic pump 12b at the time when a discharge pressure of the second hydraulic pump reaches the specific pressure, as a second pump theoretical flow rate, holds a total discharge floe rate of the first hydraulic pump and the second hydraulic pump at the time when each of the discharge pressures of the first hydraulic pump and the second hydraulic pump reaches the specific pressure, as a total pump theoretical flow rate and, based on the first pump theoretical flow rate, the second pump theoretical flow rate and the total pump theoretical flow rate, calculates leakage flow rates of the first hydraulic pump and the second hydraulic pump.SELECTED DRAWING: Figure 4

Inventors:
UDAGAWA TSUTOMU
SAKURAI SHIGEYUKI
YAMAMOTO JUNJI
SUZUKI YUKIHITO
Application Number:
JP2018145567A
Publication Date:
February 06, 2020
Filing Date:
August 02, 2018
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B20/00; E02F9/20; F15B11/02; F15B11/028; F15B11/17
Domestic Patent References:
JP2001241384A2001-09-07
JPH1054370A1998-02-24
JPS59131786A1984-07-28
Attorney, Agent or Firm:
Kaichi International Patent Office



 
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