Speed responsive power steering

Details Speed responsive power steering Speed responsive power steering

1994-04-28

1997-06-03

Boehler, Anne Marie

Motor vehicles

Steering gear

With fluid power assist

180417, 180441, 180442, B62D 506

Patent

active

056345275

ABSTRACT:
A main servo valve 4 is switched in response to a relative angular displacement between an input and an output shaft for supplying an operating oil discharged from a pump to or displacing such operating oil from a power cylinder 6. An auxiliary servo valve 10 is disposed between the input and the output shaft and is connected in parallel relationship with the main servo valve 4 so as to be operated jointly therewith. A vehicle speed responsive valve 16 which opens or closes a flow path in accordance with the vehicle speed is disposed upstream of the auxiliary servo valve 10. The pump comprises a pair of pumps 2, 12 of smaller size. At low speeds, the speed responsive valve 16 is closed, and the oil discharged from the pair of pumps 2, 12 are merged to be introduced into the main servo valve 4. As the vehicle speed increases, the speed responsive valve 16 is gradually opened, and at a vehicle speed above a given value, one of the pumps, 12, ceases to operate.

REFERENCES:
patent: 3986472 (1976-10-01), Virtue
patent: 4116577 (1978-09-01), Lauck
patent: 4570736 (1986-02-01), Waldorf
patent: 4632204 (1986-12-01), Honaga et al.
patent: 4858713 (1989-08-01), Kawakami
patent: 5127311 (1992-07-01), Bacardit
patent: 5168949 (1992-12-01), Emori et al.
patent: 5320191 (1994-06-01), Sudo et al.
patent: 5416701 (1995-05-01), Kawabata
patent: 5515938 (1996-05-01), Haga et al.

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