Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1991-02-04
1992-07-07
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
60384, 60393, 180143, F15B 910, B62D 506
Patent
active
051273110
ABSTRACT:
The hydraulic system for a servo steering of a motor vehicle, incorporates a main valve mechanism producing the assistance pressure (Pa) applied to a hydraulic assistance device (12) and including a pair of parallel fluid circuits between a source (14) of pressurized fluid and a reservoir (16), each fluid circuit comprising at least two restrictions (1,2,1',2') capable of being modulated by a rotor mechanism (10) cooperating with a stator mechanism (11), the junction point of the restrictions of each circuit being connected to a respective chamber of the hydraulic assistance device (12) and a secondary valve mechanism producing the reaction pressure (Pr) applied to the steering wheel shaft and including a second pair of parallel fluid circuits between a source (24) of pressurized fluid and a reservoir (16), each of the fluid circuits comprising at least two restrictions (3,4,3',4') capable of being modulated by the rotor mechanism (10) cooperating with stator means, the rotor mechanism (11) cooperating with the steering wheel shaft, the source (14) of pressurized fluid of the main valve mechanism supplies a fixed flow of fluid and the source (24) of pressurized fluid of the secondary valve mechanism supplies a variable flow of fluid thanks to a pump driven as a function of the vehicle speed.
REFERENCES:
patent: 4044786 (1977-08-01), Yip
patent: 4372413 (1983-02-01), Petgrsen et al.
patent: 4665797 (1987-05-01), Bacardit
patent: 4665798 (1987-05-01), Bacardit
patent: 4712632 (1987-12-01), Kervagoret
patent: 4768605 (1988-09-01), Miller et al.
patent: 4775022 (1988-10-01), Hirakushi et al.
Bendix Espana
Decker Ken C.
Look Edward K.
Nguyen Hoang
Palguta Larry J.
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