Ball drain valve for the piston space of a rotary multi-disc clu

Details Ball drain valve for the piston space of a rotary multi-disc clu Ball drain valve for the piston space of a rotary multi-disc clu

1989-03-15

1990-03-13

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Operators

192 85AA, 192103FA, 137 56, 91442, F16D 2514

Patent

active

049076841

ABSTRACT:
A ball drain valve (2), for the piston space (33) of a rotary clutch disc (3) for releasing the clutch disc piston (32) from pressure generated by rotation of pressurized oil remaining in the piston space when it is bled, including an opening (220), at least two ball spaces (25, 26) and a ball valve (23) actuated by rotation and control pressure. The ball drain valve (2) has two stages coordinated with the engaged and the disengaged positions of the clutch and the two ball spaces (25, 26) have outer diameters (D1, D2) of different sizes so that the ball valve (23), when the multi-disc clutch (3) is engaged, is in ball space (25) of large diameter (D1) and, when the clutch is disengaged, the ball valve is in ball space (26) of small diameter (D2). This arrangement achieves a quick drainage of the piston space (33) past a large gap (250) when the clutch is disengaged and prevents very little pressurized oil from escaping past a small gap (260) when the clutch (3) is engaged.

REFERENCES:
patent: 2876743 (1959-03-01), Maki
patent: 2954040 (1960-09-01), Bolster
patent: 3576241 (1971-04-01), Maurice et al.
patent: 4318311 (1982-03-01), Ross
patent: 4421218 (1983-12-01), Haight
patent: 4425879 (1984-01-01), Shadday et al.
patent: 4574926 (1986-03-01), Bubak

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