Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1987-12-28
1988-10-11
Pekar, John A.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
180141, B62D 508
Patent
active
047764198
ABSTRACT:
A closed hydraulic system (22) is provided for transmitting steering movement to servo valve (24) of a rear wheel power steering assembly (26) in response to a steering movement of a front wheel steering assembly (14). The front wheel steering assembly is controlled by a steering wheel (18) and a power steering assembly (20). The closed hydraulic system (22) includes a pump assembly (50) and an actuator assembly (96) connected together by conduits (54,56) to define closed fluid flow branches or fluid links (112,114) for moving a piston (98) in the actuator assembly in response to movement of a piston (78) the pump assembly. Movement of the actuator piston is transmitted to a valving member (106) of the servo valve via a cam assembly (104) which moves the valving member (106) to effect same direction rear wheel steering for rather small front wheel steering angles and to effect opposite direction rear wheel steering for greater front wheel steering angles. System (22) may include a reservoir assembly (66) including a piston assembly (124) for maintaining a constant positive pressure in both branches, a dash pot (124) for preventing sudden steering angle charges of the rear wheels in the event of rapid fluid loss in either branch, and check valve assemblies (134) for limiting the maximum pressure differential between the branches.
REFERENCES:
patent: 3292725 (1966-12-01), Hlinsky
patent: 4313514 (1982-02-01), Furukawa et al.
patent: 4621702 (1986-11-01), Kanazawa et al.
patent: 4646867 (1987-03-01), Kanazawa et al.
patent: 4666013 (1987-05-01), Shibahata et al.
patent: 4671523 (1987-06-01), Naumann
patent: 4697816 (1987-10-01), Kawamoto et al.
SAE Technical Paper Series 860624--Improvement of Vehicle Dynamics by Vehicle-Speed-Sensing Four-Wheel Steering System--Yasuda, et al.
Hydronic Corporation Brochure--Remote Control Steering.
Eaton Corporation
Pekar John A.
Rulon P. S.
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