192 clutches and power-stop control – Clutch and brake
Patent
1999-04-21
2000-08-01
Lorence, Richard M.
192 clutches and power-stop control
Clutch and brake
74 11, F16D 6704, B60K 1728
Patent
active
060952970
ABSTRACT:
A hydraulic system for a power-take-off in a utility vehicle is described, having a pump (8) supplying hydraulic fluid to the clutch (1), the brake (2) and a lubricating circuit, a control valve for engaging and releasing the clutch and a device containing a pressure-limiting valve (12) which makes a high system pressure available when the clutch is engaged and a lower system pressure when the clutch is released.
In order to keep loss of power in the pump as low as possible and reduce the number of components required in a hydraulic system of this type, the system pressures are controlled by the pressure applied to the engaged clutch. Consequently, the system pressures can be adjusted regardless of the design of control valve used. This means that less expensive 3/2-way valves or 3/2-control valves can be used. This also has an advantage in that different system pressures can be produced using a single pressure-limiting valve. The hydraulic system is suitable for all types of utility vehicle with a power-take-off.
REFERENCES:
patent: 3669229 (1972-06-01), Ronayne et al.
patent: 3893552 (1975-07-01), Dahl
patent: 4029189 (1977-06-01), Freiburger
patent: 4179887 (1979-12-01), Ridder et al.
patent: 4296649 (1981-10-01), Marquart
patent: 4411345 (1983-10-01), Haight et al.
Bosl Theodor
Mayer Jakob
Reisch Johann
AGCO GmbH & Co.
Lorence Richard M.
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