192 clutches and power-stop control – Clutch and brake
Patent
1981-01-29
1983-10-04
Herrmann, Allan D.
192 clutches and power-stop control
Clutch and brake
137596, 13762568, 137864, 137871, F16D 6704, F15B 1307
Patent
active
044074000
ABSTRACT:
A winch control valve is provided for controlling the flow of fluid to and from a clutch and a brake of a winch transmission which are operable for establishing a hold condition in the winch when no fluid pressure is connected to the clutch and brake, a free spool condition wherein pressure fluid is connected to only the brake, and a wind-in condition wherein fluid pressure is connected to both the clutch and the brake. In addition, the valve spool is provided with lands which are dimensioned slightly smaller than service ports leading to the clutch and brake of the winch so that pressure fluid may selectively be routed to the service ports and at the same time, be metered to sump whereby a partial clutch engagement pressure may be effected in the clutch to thereby establish an inching condition and whereby partial pressure may be established in the brake passage for effecting a partial release thereof so as to establish a controlled release condition in the winch. Also provided is a pin-operated inlet check ball for connecting pressurized fluid to the control valve when needed. The pin is, in turn, operated through means of a cam on the winch control valve spool such that the check ball is unseated by rolling it off a fluid pressure outlet leading from a valve housing to which a source of fluid pressure is connected.
REFERENCES:
patent: 3729171 (1973-04-01), Yates et al.
patent: 3991787 (1976-11-01), Schmitt et al.
Deere & Company
Herrmann Allan D.
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