Drive unit and method for operating a drive unit
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United States of America Patent
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-
Aug 19, 1997
Issued Date -
N/A
app pub date -
May 20, 1996
filing date -
Mar 11, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A drive unit for vehicles with an engine and a gearbox, and with a hydrodynamic retarder. The retarder is in constant drive connection with the engine. The unit includes a coolant circuit whose coolant is at the same time the working medium of the retarder, and the retarder can be utilized as a coolant pump. The retarder is arranged before the gearbox, and the retarder can be united with an engine brake to an overall brake unit (OBU). The overall brake unit is configured such that the retarder can in a braking operation engage sooner than the engine brake.
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