Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1993-01-08
1994-08-23
Focarino, Margaret A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180142, 180146, 180149, 91375A, 13762523, B62D 5083, F15B 13043
Patent
active
053399170
ABSTRACT:
A power steering device supplies hydraulic oil to the left and right chambers (6,7) of a servo cylinder (3) by means of a pump (10) via a rotary slide valve (9), whereby a reaction piston (18) that is stressed by a pressure spring (19) is arranged between an input shaft (14) and a control sleeve (15) of the rotary slide valve (9). In order to create a simply constructed hydraulic reaction system for this power steering device, it is suggested that a ratio pressure control valve (VDRV) (30) to reduce the system pressure (P) to a lower reaction pressure (P2) and a variable stop (29) to control the hydraulic retroactive moment as a function of the speed are arranged in a line (31) between the pump (10) and the rear side of the reaction piston (18) that is stressed by the pressure spring (19). The invention furthermore suggests that a variable stop (34) to control the return pressure (PR) as a function of the speed is arranged in a line (PR) between the front side of the reaction piston (18) and a tank (27).
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Focarino Margaret A.
TRW Fahrwerksysteme GmbH & Co. KG
Zeender Florian
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