B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
B62D 5/06 (2006.01) B62D 5/12 (2006.01) B62D 5/22 (2006.01)
Patent
CA 2157737
A power steering system (10) for use in a vehicle includes a power steering pump (12) which is driven by an engine (13) of the vehicle. The output from the power steering pump (12) is connected to a power steering valve (22). The power steering valve (22) is connected with a power steering motor (24). When the engine (13) is turned off, that is, in a non-operating condition, and the power steering pump (12) is not being driven, the fluid pressure in motor cylinder chambers (40, 42) is prevented from falling below a predetermined pressure to keep seals (64, 66) in sealing engagement with the power steering motor 24. To keep the fluid pressure in the motor cylinder chambers (40, 42) from falling below a predetermined pressure, a one-way valve (70) blocks the flow of fluid from the power steering valve (22) back to the reservoir (16). A pressure relief valve (72) blocks the flow of fluid from the power steering valve (22) to the reservoir (16) when the fluid pressure in the motor cylinder chambers (40, 42) is equal to or less than the predetermined pressure required to urge seals (64, 66) into sealing engagement with the power steering motor 24.
Système de servodirection (10) pour véhicule. Le système comprend une pompe (12) actionnée par un moteur (13) du véhicule. L'orifice de refoulement de la pompe du système (12) est relié à une vanne (22) de servodirection. Cette vanne (22) est associée au moteur de servodirection (24). Lorsque le moteur (13) n'est pas en marche et que la pompe de servodirection (12) n'est pas actionnée, la pression hydraulique dans les cylindres (40, 42) du moteur est maintenue à un niveau déterminé afin que les joints (64, 66) assurent l'étanchéité du système de servodirection. Pour maintenir la pression constante dans les cylindres (40, 42), une soupape anti-retour (70) empêche le retour du fluide, par la vanne de servodirection (22), jusqu'au réservoir (16). Une soupape de surpression (72) empêche le fluide de s'écouler de la vanne de servodirection (22) vers le réservoir (16) lorsque la pression hydraulique dans les cylindres (40, 42) est égale ou inférieure à la pression requise pour forcer les joints (64, 66) en position d'obturation par rapport au système de servodirection.
Fetherstonhaugh & Co.
Trw Inc.
LandOfFree
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