Machine element or mechanism – Gearing – Interchangeably locked
Patent
1991-04-19
1991-12-31
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
74475, F16H 506
Patent
active
050761129
ABSTRACT:
A shift apparatus for shifting a transfer case between a two-wheel drive mode and a four-wheel drive mode. The shift apparatus includes a sector plate supported within the transfer case for rotation about an axis. A first pin member is biased into engagement with a first surface of the sector plate. The first pin member is adapted to move a first shift fork in response to selective rotation of the sector plate between first and second positions corresponding to the two-wheel drive mode and the four-wheel drive mode of the transfer case. The sector plate first surface has a first cam edge provided for positioning the first shift fork in the first position, a second cam edge for moving the first shift fork between the first position and the second position in response to rotation of the sector plate, and a third cam edge for retaining the said first shift fork in the second position upon continued rotation of the sector plate. According to the present invention, the second cam edge includes a plurality of sequentially ramped surfaces which are each adapted to cause a variable range of axial forces to be exerted on the first pin member during movement thereof between the first and second positions.
REFERENCES:
patent: 2772652 (1956-12-01), DuShane et al.
patent: 3700083 (1972-10-01), Ashikawa et al.
patent: 4381828 (1983-05-01), Lunn et al.
patent: 4409858 (1983-10-01), Lasoen
patent: 4704917 (1987-11-01), Hiroyasu
patent: 4770280 (1988-09-01), Frost
New Venture Gear Inc.
Wright Dirk
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