HST drive circuit
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United States of America Patent
Stats
-
Sep 18, 2007
Grant Date -
Mar 9, 2006
app pub date -
Apr 27, 2004
filing date -
Aug 7, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention makes it possible, in an HST drive circuit wherein an HST pump and an HST motor have been separately stored in a pump case and a motor case, to efficiently cool the HST drive circuit. A cooling line for, while discharging a relief oil from a charge circuit 9 for replenishing an HST closed circuit 5 with a pressure oil into a pump case 3, making the discharged oil flow into a reservoir 7 through the pump case 3, a communicating pipe 14, a motor case 4, and an oil cooler 16 is formed, so that hydraulic oil circulating through an HST pump 1, an HST motor 2, and the HST closed circuit 5 is cooled by an oil flowing through the cooling line.
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