Variable assist power steering system

Details Variable assist power steering system Variable assist power steering system

1987-12-28

1990-09-25

Pekar, John A.

Motor vehicles

Including one or more ski-like or runner members

With at least one surface-engaging propulsion element

60494, 13762529, 180143, B62D 583

Patent

active

049586955

ABSTRACT:
A control valve includes valve elements relatively displaceable in response to a predetermined variable (e.g., a steering torque) to define therebetween two parallel fluid flow paths connected between a fluid source and a fluid reservoir to produce pressure difference in a power cylinder. The control valve comprises a bypass path provided with a variable flow orifice that has an orifice area variable in response to said predetermined variable and an externally controlled variable flow orifice valve that has an orifice area variable in response to a second predetermined variable which is different from the first predetermined variable.

REFERENCES:
patent: 4465098 (1984-08-01), Bacardit
patent: 4512238 (1985-04-01), Bacardit
patent: 4561516 (1985-12-01), Bishop et al.
patent: 4561521 (1985-12-01), Duffy
patent: 4565115 (1986-01-01), Bacardit
patent: 4570735 (1986-02-01), Duffy
patent: 4619339 (1986-10-01), Futaba et al.
patent: 4632204 (1986-12-01), Honaga et al.
patent: 4665798 (1987-05-01), Bacardit
patent: 4669568 (1987-06-01), Kervagoret
patent: 4672885 (1987-06-01), Kervagoret

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