Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1991-10-25
1992-12-08
Look, Edward K.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
913691, 91376R, 91374, 605471, F15B 910
Patent
active
051687909
ABSTRACT:
A liquid pressure booster includes a power piston slidably disposed in a housing, a power chamber in the housing on one side of the power piston, the power piston having a stepped bore including smaller and larger diameter bores, the latter opening into the power chamber, a supply passage communicating the smaller diameter bore to a pressure fluid source, a first valve seat in the smaller diameter bore, a valve element slidable in the smaller diameter bore to seat upon the first valve seat from the side nearer the pressure fluid source, an annular pin abutting the valve element side nearer the larger diameter bore to move the valve element away from the first valve seat, a discharge passage axially through the annular pin and communicating between the power chamber and a reservoir, and a second valve seat formed on the free end of the annular pin to interrupt communication between the power chamber and the discharge passage upon abutment of the annular pin against the valve element, a stepped sleeve having smaller and larger diameter portions which are fitted into the smaller and larger diameter power piston bores, a stopper ring and a further sleeve fitted successively in the larger diameter power piston bore, the stopper ring and sleeve successively contacting the stepped sleeve larger diameter portion, the further sleeve being secured to the power piston to secure the stepped sleeve and the stopper ring to the power piston.
REFERENCES:
patent: 3106874 (1963-10-01), Schultz
patent: 3165980 (1965-01-01), Peras
patent: 3707880 (1973-01-01), Bach
patent: 3747473 (1973-07-01), Bach et al.
patent: 4075848 (1978-02-01), Veda
patent: 4656923 (1987-04-01), Tsuyuki et al.
patent: 4706546 (1987-11-01), Inoue et al.
patent: 4905571 (1990-03-01), DeHoff et al.
Jidosha Kiki Co. Ltd.
Look Edward K.
Mattingly Todd
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