Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1975-04-22
1976-11-02
Wood, Jr., M. H.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
B62D 506
Patent
active
039891208
ABSTRACT:
The invention provides a compact control valve for double acting steering system servomotors utilizing a housing and control valve therein with coacting lands and passage means effecting a transfer of fluid from one pressure chamber to the other of a single piston rod servomotor. Such transfer is in response to automatic straightening of the wheels of a vehicle by road contact after they have been turned to effect steering. In particular, since the servomotor pressure chambers are unequal in volume due to the bulk of the piston rod passing through only one chamber, some volume compensation for shunting of the fluid between chambers is required due to excess of fluid in going to the smaller volume chamber from the larger volume chamber, and deficit of fluid when transferring in the opposite direction. The problem is met in the first case by direct shunting through the control valve of the excess portion of fluid to a return passage in the housing; and in the second case by providing a suction operated check valve which opens to draw additional fluid from the return passage to provide for complete filling of the larger pressure chamber.
REFERENCES:
patent: 2808120 (1957-10-01), Hunter
patent: 3497032 (1970-02-01), Schott
patent: 3553966 (1969-05-01), Liebert
patent: 3587235 (1971-06-01), Goff et al.
patent: 3874473 (1975-04-01), Grove
Lang Armin
Liebert Karl-Heinz
Schrecengost R.
Wood, Jr. M. H.
Zahnradfabrik Friedrichshafen AG
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