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Patent Searching and Data


Title:
HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2014/061507
Kind Code:
A1
Abstract:
In order to prevent the closing of a pressure compensation valve on a lower load-pressure side and thus to prevent a reduction in speed or stopping of the actuator on the lower load-pressure side when saturation occurs in a combined operation in which there is a large difference between the load pressures of two actuators, and in order to ensure the required amount of pressurized oil for the actuator on a higher load-pressure side and thus to prevent a reduction in speed or stopping of the actuator on the higher load-pressure side when saturation occurs in a combined operation in which there is a particularly large difference between the load pressures of the two actuators, switch valves (100f, 100g, 100h), which reduce the passage area of parallel oil passages (41f, 41g, 41h) when driving operation devices (34a, 34b) are operated, are arranged respectively in the parallel oil passages (41f, 41g, 41h).

Inventors:
TAKEBAYASHI YOSHIFUMI (JP)
TAKAHASHI KIWAMU (JP)
MORI KAZUSHIGE (JP)
NAKAMURA NATSUKI (JP)
Application Number:
PCT/JP2013/077364
Publication Date:
April 24, 2014
Filing Date:
October 08, 2013
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
E02F9/22; F15B11/05; F04B49/00; F04B49/08
Foreign References:
JP2010101095A2010-05-06
JPS646501A1989-01-11
JP2005226678A2005-08-25
JPH0762694A1995-03-07
JPH0419406A1992-01-23
JP2007024103A2007-02-01
JPH0776861A1995-03-20
Other References:
See also references of EP 2910797A4
Attorney, Agent or Firm:
KASUGA Yuzuru (JP)
Kasuga 讓 (JP)
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