Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1986-02-18
1988-02-16
Love, John J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
137117, 25112912, B62D 508
Patent
active
047249196
ABSTRACT:
A power assisted vehicle steering system has a rack and pinion steering gear 6 incorporating a servo motor 6a controlled by a valve 22. A fluid pressure supply line 3 to the valve 22 includes a throttle or regulating valve 5 which is adjustable by a stepping motor 30 that is speed responsive to increase incrementally the restriction by the valve 5 to fluid flow to the valve 22 as vehicle speed increases. A flow control valve 7 is responsive to fluid pressure in the line 3 upstream of the valve 5 and to fluid pressure in the line 3 downstream of the valve 5 so that a pressure differential across the valve 5 is sensed by spool 9 which is displaced to open the supply line 3 upstream of the valve 5 and a reservoir 1. This latter opening reduces the supply of pressure fluid available for actuating the servo motor 6a and the available power assistance as the vehicle speed increases.
REFERENCES:
patent: 3488030 (1970-01-01), Hulme et al.
patent: 3882954 (1975-05-01), Inoue
patent: 4153021 (1979-05-01), Hattori
patent: 4458713 (1984-07-01), Wernberg
patent: 4463930 (1984-08-01), Vamvakas
Love John J.
TRW Cam Gears Limited
Watts Charles R.
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