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US 5,992,590 AGranted
Hydraulic actuation system
AssigneeKongsberg Techmatic Limited
InventorDavid Anthony Harries
Life of this patent
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AssigneeKongsberg Techmatic Limited
InventorDavid Anthony Harries
Estimating the term…
An actuation system particularly for the operation of a vehicle clutch and/or gearbox ratio selector members in which a pump charges an accumulator via a non-return valve. A slave cylinder receives pressurised fluid from the accumulator via a solenoid-operated control valve. The control valve also controls the exhaust of fluid from the slave cylinder. The control valve has a rest position in which pressurised fluid from the pump is returned to sump and the slave cylinder is vented to sump, a first energised position in which the return of pressured fluid to sump is cut-off and the slave cylinder remains vented to sump, and a further energised position in which venting of the slave cylinder is cut-off and the slave cylinder is supplied with pressurised fluid from the accumulator. The pump may be electrically driven and stopped when the accumulator pressure is above a pre-determined level.
An actuation system comprising a pump which charges an accumulator via a non-return valve, a solenoid-operated control valve which receives pressurised fluid from the accumulator, and a slave cylinder receives pressurised fluid from the accumulator via the control valve and which from which fluid can also be exhausted via the control valve, the control valve has a rest position in which pressurised fluid from the pump is returned to a sump and the slave cylinder is vented to the sump, a first energised position in which the return of pressurised fluid to the sump is cut-off and the slave cylinder remains vented to the sump, and a further energised position in which venting of the slave cylinder is cut-off and the slave cylinder is supplied with pressurised fluid from the accumulator.
Dependencies are inferred from the claim text.