192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
2000-04-03
2001-09-18
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C188S082300, C188S082400, C192S069100, C192S085060, C192S09300C
Reexamination Certificate
active
06290044
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a selectable one-way clutch assembly for an automatic transmission.
BACKGROUND OF THE INVENTION
One-way clutches are commonly employed in automatic transmissions for automobiles. A one-way clutch allows a first clutch plate to free-wheel in a first rotational direction relative to a second clutch plate, and to clutch in a second rotational direction. Examples include roller clutches and sprag clutches.
It may be desirable to have the one-way clutching mode operable only upon demand, such that it is in free-wheeling mode in both directions until the one-way clutching is selectively actuated. There are different means of selecting when the free-wheeling stops and one-way clutching begins.
There exists a need for a simple selectable one-way clutch which allows free-wheeling in both directions when the clutch is not actuated. When the clutch is actuated, the clutch plate may be held fixed from rotating in a first direction, but allowed to rotate in a second, overrun direction.
SUMMARY OF THE INVENTION
The present invention is directed to a selectable one-way clutch assembly for use in an automatic transmission having two axially adjacent, rotatable plates wherein a first, strut plate freewheels in both directions relative to a second, actuator plate in a clutch-inactivated state. When the clutch is selectively actuated, the strut plate is fixed to the actuator plate in the clutching direction, but is rotatable in the second, overrun direction.
The selectable one-way clutch assembly comprises the annular strut plate rotatable about a central hub and having circumferentially spaced pockets and struts mounted therein. The struts have a catching end biased outboard to contact the axially adjacent actuator plate. The actuator plate includes apertures arranged circumferentially thereabouts and extending therethrough. An annular selecting plate, axially adjacent the actuator plate, has circumferentially-spaced teeth extending axially inboard and configured to fit in the apertures in the activator plate. The selecting plate has selecting cams extending axially from an outboard surface to mesh with interior cams on an axially adjacent control plate.
A turning means is selectively operable to activate one-way clutching mode by rotating an outboard-extending pin of the control plate to disengage the selecting cams and displace the selecting plate and the teeth inboard beyond the inboard face of the activator plate. The struts catch the teeth when the strut plate is rotated in a clutching direction, thereby fixing the strut plate to the activator plate. When the strut plate is rotated in the opposing, overrun direction, the catching ends of the struts are cammed in the pockets by ramped camming ends of the teeth, thereby allowing freewheeling of the strut plate in the overrun direction. When the turning means is deselected to inactivate the one-way clutching mode, a return spring disposed between the activator plate and the selecting plate provides an outboard biasing load on the selecting plate and control plate such that the teeth are fully retracted within the apertures, allowing freewheeling of the strut plate in either direction relative to the actuator plate.
REFERENCES:
patent: 4466520 (1984-08-01), Herman
patent: 4629044 (1986-12-01), Post et al.
patent: 4771872 (1988-09-01), Kampf
patent: 5152726 (1992-10-01), Lederman
patent: 5927455 (1999-07-01), Baker et al.
patent: 5937980 (1999-08-01), Dick
patent: 5967277 (1999-10-01), Walter
patent: 6032774 (2000-03-01), Gadd
patent: 5-126170 (1993-05-01), None
Burgman Boris Iosifovich
Joppeck Dwayne Paul
Kimes John William
Bonck Rodney H.
General Motors Corporation
Hargitt Laura C.
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