Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1988-07-27
1991-09-17
Kashnikow, Andres
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180143, 10468, B62D 506
Patent
active
050486284
ABSTRACT:
An hydraulic fluid actuated power assisted steering system has an open center valve 4 adjustable in response to a steering input to control fluid flow to a power assistance ram 6. A by-pass valve 8 communicates between a pressure line 3 and a return line 7 of the valve 4. The by-pass valve has a control port 11 which is adjustable by a valve member 9 spring biased at 10 to normally open the control port 11 so that fluid flow from line 3 to line 7 by way of port 11 alleviates the generation of noise in the valve 4 and back pressure in the line 3. The valve member 9 is responsive to a predetermined fluid pressure differential developing between the line 3 and 7 when the valve 4 is operated so that the member 9 is displaced to close port 11 and direct greater fluid flow from pump 2 to the ram 6.
The power assistance may be speed responsive by increasing the resistance to displacement of the valve member 9 in a sense to close the port 11 by providing pistons 30 which engage the valve member 9 with a force which increases with vehicle speed, such force being provided by the application of fluid pressure to the pistons 30 from a vehicle speed responsive pump 33.
REFERENCES:
patent: 4691797 (1987-09-01), Miller
patent: 4759419 (1988-07-01), Nagae et al.
patent: 4768605 (1988-09-01), Miller et al.
patent: 4830130 (1989-05-01), Rayner
Comb Richard
Kashnikow Andres
TRW Cam Gears Limited
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