Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – With means to control the working fluid to one working...
Patent
1987-05-26
1989-01-17
Garrett, Robert E.
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
With means to control the working fluid to one working...
91460, 60589, B60T 1314, B60T 1502, F15B 1702
Patent
active
047981270
ABSTRACT:
Hydraulic assistance device for brake actuation comprising a body (10) having a bore (12) in which first and second piston mechanisms (34, 56) are slidably mounted, the first piston mechanism (34) being displaceable under the effect of the actuation of a third piston (16) mounted slideably in the bore (12), and the second piston mechanism (56) being displaceable by way of a hydrostatic connection formed in a presure chamber (60) defined between the first and the second piston mechanism (34, 56), there being associated with each piston mechanism (34, 56) a respective valve mechanism (52, 78) in a respective hydraulic circuit between a fluid source under pressure (54, 84) and a respective brake circuit (62,88), and a third chamber (30) defined in the bore (12) between the first piston mechanism (34) and the third piston (16), characterized in that the third chamber (30) is partially delimited by a fourth piston (92) which is displaceable under the effect of the pressure in the third chamber (30) as it meets a first spring mechanism (102; 104, 144).
REFERENCES:
patent: 3918765 (1975-11-01), Hayashida
patent: 4671168 (1987-06-01), Sauvee
Levrai Roland
Picot Pascal
Riquart Christian
Bendix France
Decker Ken C.
Garrett Robert E.
Kapsalas George
Palguta Larry J.
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