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Patent Searching and Data


Title:
HST CIRCUIT FOR TRAVELING
Document Type and Number:
Japanese Patent JP2010038203
Kind Code:
A
Abstract:

To provide an HST circuit for traveling which can simplify the pipe arrangement of a motor capacity control circuit for performing hydraulic pressure control on the capacity of a traveling motor based on a forward/backward change-over command.

The HST circuit includes: a main circuit 20 in which the traveling motor is connected in closed circuit connection with a main pump 22 through a pair of main hydraulic pressure pipe lines 30A, 30B; a charge circuit 40 supplying a hydraulic fluid to a low pressure side main hydraulic pressure pipe line 30A or 30B; a flushing circuit 60 returning the low pressure side main hydraulic pressure pipe line 30A or 30B to a hydraulic oil tank 64; and a motor capacity control circuit 70 which allows capacity control of a traveling motor 26 concerned with a commanded traveling direction when forward/backward change-over command, wherein the motor capacity control circuit 70 includes a branch pipe 72 branched from the flushing circuit 60; the circuit introduces a pressure of the low pressure side main hydraulic pressure pipe line 30A or 30B introduced into the flushing circuit 60 as a pilot pressure through the branch pipe 72; and the circuit controls the capacity of the traveling motor 26.


Inventors:
TSUBO TAKAHIRO
NIITOME TAKASHI
YABUUCHI AICHI
ITOGA KENTARO
NUMAGUCHI KAZUHIRO
Application Number:
JP2008000199724
Publication Date:
February 18, 2010
Filing Date:
August 01, 2008
Export Citation:
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Assignee:
HITACHI CONSTRUCTION MACHINERY
International Classes:
F15B11/08; F15B11/02; F16H39/02; F16H61/40
Attorney, Agent or Firm:
特許業務法人 武和国際特許事務所