Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hiroshi Horii0
Date of Patent
August 11, 2009
0Patent Application Number
122033230
Date Filed
September 3, 2008
0Patent Primary Examiner
Patent abstract
A pilot pressure control valve V17 is provided that is switchable between an operation position 56 where pilot pressure is supplied to a first channel switching valve V12 and a non-operation position 57 where pilot pressure is not supplied to the first channel switching valve V12; this pilot pressure control valve V17 is switched to the non-operation position 57 during a state of non-travel and is switched to the operation position 56 with a pilot pressure established in a travel detection circuit 54, and in the operation position 56, supplies a pilot source pressure to the first channel switching valve V12 from a fourth pump P4 on the upstream side of a pressurized oil introduction orifice 53.
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