Hydraulic booster

Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – One path includes restriction

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Details

91 49, 91372, 91431, F15B 910

Patent

active

042903408

ABSTRACT:
A hydraulic booster including a housing provided with an inlet hydraulically connected to a pump, a drain port hydraulically connected to a reservoir and a cylindrical bore, a power piston sealingly and slidably disposed within the bore and dividing the cylindrical bore into a working chamber and a drain chamber which is in normal communication with the drain port, an input member sealingly and slidably passed through a first end wall of the bore, the input member having an inner end sealingly and slidably interposed within the power piston and a valve seat formed on the inner end fact thereof, an output member sealingly and slidably passed through a second end wall of the bore and connected to the power piston at an inner end of the power piston the output member provided therein with a passage communicating with the inlet, a poppet valve member sealingly and slidably disposed within the power piston and cooperable with the valve seat for controlling hydraulic communication between the working chamber and the drain chamber, the poppet valve member provided with a passage therethrough and an axial projection on a back face portion thereof, the passage in the poppet valve being in hydraulic communication with the working chamber, and a check valve provided within the power piston for controlling hydraulic communication between the passages and opened by the axial projection of the poppet valve member when the poppet valve is slid by the input member due to engagement thereof with the valve seat upon advancement of the input member.

REFERENCES:
patent: 2883970 (1959-04-01), Stolzer
patent: 3834277 (1974-09-01), Yabuta et al.
patent: 3926093 (1975-12-01), Nakagawa
patent: 3957074 (1976-05-01), Taft
patent: 4022111 (1977-05-01), Taft
patent: 4075848 (1978-02-01), Ueda
patent: 4135435 (1979-01-01), Adachi
patent: 4154257 (1979-05-01), Adachi

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