Power transmission apparatus
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United States of America Patent
Stats
-
Jan 1, 1991
Grant Date -
N/A
app pub date -
Mar 13, 1989
filing date -
Mar 14, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To realize three functions of twin viscous coupling in four-wheel drive, free coupling in two-wheel drive, and further direct (lock) coupling in four-wheel drive, the power transmission apparatus for transmitting power from a propeller shaft (9A) to two right and left rear wheel drive shafts (21A, 23A), comprises first and second hubs (4, 5) coupled to the drive shafts; cylindrical inner and outer casings (3a3b) for forming two working chambers (11, 12) in cooperation with the two hubs; first and second resistance plates (8, 9), and a driven member (17) for selectively engaging the inner casing with the outer casing (TWIN VISCO IN 4WD) and disengaging the inner casing from the outer casing (FREE IN 2WD). Further, it is also preferable to use hollow clutch pipes (99, 101) disposed between the two drive shafts (21A, 23A) and the two hubs (49, 51) for selectively engaging the two drive shafts with the two hubs (TWIN VISCO IN 4WD) or with the cylindrical casing (29) (LOCK IN 2WD), and disengaging the two drive shafts from both the two hubs and the cylindrical casing (FREE IN 2WD).
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