Transmission for four-wheel drive vehicle
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United States of America Patent
Stats
-
Jul 3, 2001
Grant Date -
N/A
app pub date -
Nov 24, 1999
filing date -
Jun 7, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor vehicle transmission has a differential assembly (17) in which one input, sun gear (39), of an epicyclic gear train can be selectively coupled by a sleeve (59) through a viscous coupling (55) to either an input, i.e. annulus gear (31), or to another output, i.e. carrier (36). Coupling the sun gear to the annulus gear gives a low resistance mode of operation and coupling the sun gear to the carrier gives a high resistance mode of operation. A locked mode where the annulus is locked to the sun gear is also described, together with a free mode where the viscous coupling is disconnected from both the annulus gear and the carrier. The sleeve is lined to the control of a range change gearbox to select the low resistance mode when a high range is selected for on-road use and a high resistance mode is selected when a low range is selected for off-road use.
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