Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2008-05-06
2008-05-06
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
Reexamination Certificate
active
11475057
ABSTRACT:
An electrically actuated brake booster capable of obtaining a desired boost ratio for a given input pressure when an electric actuator is activated as a boost source, so as to ensure a desired operability of a brake pedal. The electrically actuated brake booster comprises: an input piston22to which an input thrust is applied through an input rod9that moves in coordination with operation of a brake pedal8; and a booster piston21to which a booster thrust is applied by an electric actuator40that uses an electric motor41as a drive source, such that the input piston22and the booster piston21are disposed to be movable relative to each other but are normally maintained in a neutral position of relative displacement by means of springs34. While an amount of relative displacement between the pistons21and22is determined by the potentiometer45, the electric motor41is controlled to adjust the amount of relative displacement to a predetermined value. At the same time, a reaction force acting on the input piston22resulting from a hydraulic brake pressure is offset by urging forces of the springs34to thereby obtain a desired level of boost ratio.
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Ikeda Jun-ichi
Ohtani Yukio
Hitachi , Ltd.
Lazo Thomas E.
Wenderoth , Lind & Ponack, L.L.P.
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