Clutch assembly for an automatic mechanical transmission

Details Clutch assembly for an automatic mechanical transmission Clutch assembly for an automatic mechanical transmission

1992-12-30

1994-04-26

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Axially engaging

192 85AA, 192113LC, F16D 1374, F16D 25063

Patent

active

053058631

ABSTRACT:
A lubrication system for an automatic transmission clutch assembly having a drive and driven rotary member rotatable by a common axis with a clutch element therebetween for connecting and disconnecting the members. The drive member has an internal passageway formed therein for feeding the lubricant to the clutch member. The passageway has a section which is radially spaced from the axis of rotation and as a seat formed therein for cooperating with the rotationally speed sensitive valve oriented in the first passageway. Below first rotational speed, the lubricant pressure maintains the valve against the seat restricting the flow of lubricant to the clutch element. When the driven member is rotated above the first rotational speed. Centrifugal force biases the valve off the seat, allowing lubricant to be supplied to the clutch element. Preferably, a second lubrication passageway is provided having a seat in an internal valve which selectively supplies a lubricant to the clutch element at a second higher rotational speed. In order to further reduce disengaged clutch drag at idle, a speed sensitive piston retract spring is provided to increase piston travel at low engine speeds while maintaining minimum travel at off idle operation.

REFERENCES:
patent: 1245718 (1917-11-01), Herr
patent: 2740512 (1956-04-01), Fischer
patent: 2907428 (1959-10-01), Erwin et al.
patent: 3306408 (1967-02-01), Kahle
patent: 4724942 (1988-02-01), Casse et al.
patent: 4784019 (1988-11-01), Morscheck
patent: 4860861 (1989-08-01), Gooch et al.
patent: 4905812 (1990-03-01), Shepperd
patent: 5109721 (1992-05-01), Boardman et al.
patent: 5136897 (1992-08-01), Boardman

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