Motors: expansible chamber type – With alternative manual actuation of load – Alternate pedal positions
Patent
1979-02-22
1980-12-30
Maslousky, Paul E.
Motors: expansible chamber type
With alternative manual actuation of load
Alternate pedal positions
91 49, 91431, 91460, F15B 1310, F15B 1702
Patent
active
042416426
ABSTRACT:
A hydraulic power booster system in which a hydraulic power brake booster has a hydraulic ratio changing mechanism. The ratio is established by trapping hydraulic fluid in a chamber with an input piston having a larger effective area than an output piston forming movable chamber walls. A ratio piston or sleeve exposed to booster power pressure and the trapped pressure is moved upon power runout, causing the booster ratio to change as the ratio of these pressures change, providing a smooth transition from a high ratio toward a 1:1 ratio as the booster shifts to manual operation from hydraulic power operation. A valve which operates to trap pressure in the chamber upon booster actuation also provides a vent path from the chamber when the booster is fully released so that any air in the chamber may be bled out.
REFERENCES:
patent: 3733966 (1973-05-01), Brown, Jr.
patent: 3818705 (1974-06-01), Thomos
patent: 3831491 (1974-08-01), Thomos
patent: 3915066 (1975-10-01), Thomos et al.
patent: 3988967 (1976-11-01), Przel
patent: 4007665 (1977-02-01), Przel
General Motors Corporation
Maslousky Paul E.
McGraw D. D.
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