Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1980-07-23
1982-12-28
Song, Robert R.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
91510, 91517, 180141, B62D 508
Patent
active
043656846
ABSTRACT:
A power assisted steering gear assembly having a first fluid system 5 comprising a first pressure operated device such as a double acting piston and cylinder, a first valve for controlling fluid flow to the first pressure operated means in response to a steering input in shaft 2 and a first fluid pump 7. The first pressure operated means can be a conventional power assisted steering gear 1 imparting rotation to a drop arm 8. A second fluid system 20 comprises second valve means controlling fluid flow from a second pump 26 to a second piston and cylinder device incorporated in a ram unit 12. The second valve in the ram unit 12 is responsive to displacement of the drop arm 8 and reacts to determine power assistance provided by the system 20 to a steering maneuver, such power assistance being additional to that provided by the system 5. Displacement of the ram unit 12 controls movement of a steering linkage through drag link 38. In a modification the system 20 can include an auxilliary valve which is responsive to fluid pressure in the system 5 so that when that pressure attains a predetermined value the auxilliary valve reacts to render ineffective power assistance from the ram unit 12. In the event of fluid pressure failure in the system 5 the auxilliary valve reacts to restore pressure fluid to the ram unit 12 and provide power assistance in the system 20.
REFERENCES:
patent: 3602326 (1971-08-01), Garrison
patent: 3990534 (1976-11-01), Weisgerber
patent: 4013138 (1977-03-01), McBurnett
patent: 4206827 (1980-06-01), Adams
Cam Gears Limited
McGiehen Donn
Song Robert R.
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