192 clutches and power-stop control – Clutch and brake
Patent
1996-09-23
1998-04-28
Lorence, Richard M.
192 clutches and power-stop control
Clutch and brake
192 524, 192 85R, 192109F, F16D 6704, F16D 2512
Patent
active
057433666
ABSTRACT:
Disclosed is a modulating hydraulic circuit for controlling a clutch such as the clutch on a power takeoff (PTO) shaft. The circuit includes a throttling valve having (a) an inlet port for receiving hydraulic fluid from a source, and (b) a discharge port connected to the clutch. The discharge port is also connected to an accumulator which is at an accumulator pressure. The discharge port and the clutch are at a pressure generally proportional to the accumulator pressure. As accumlator pressure rises at a controlled rate, the clutch is progressively engaged. Optionally, the circuit includes a brake control valve for "softly" disengaging a PTO shaft brake as the accumulator pressure rises. A method for controlling the clutch includes flowing hydraulic fluid through hydraulic lines to a throttling valve connected to an accumulator and to the clutch, increasing pressure in the lines and progressively engaging the clutch.
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patent: 4951795 (1990-08-01), Mori
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Clifford Jimmie D.
Stoever Guy T.
Case Corporation
Lorence Richard M.
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