Electronic control type brake booster for vehicle

Power plants – Pressure fluid source and motor – Pulsator

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605471, 91367, 91376R, F15B 700

Patent

active

057460574

ABSTRACT:
An electronic control type brake booster having a brake booster; an air path separately formed from a path to which an engine vacuum pressure of said brake booster is applied; a pressure control valve arranged in the air path and driven by a solenoid valve, said pressure control valve providing a pilot pressure to the air path of said brake booster to control the pressure in the air path to a pressure between atmospheric pressure and the engine vacuum pressure; a wrinkled bellows tube connected to a predetermined portion of said air path connected to the pressure control valve; an operational chamber inwardly formed of a movable wall communicated with the bellows tube; a plunger located at an inside portion of the movable wall and formed with an operational chamber and a further chamber according to an operation of the plunger; an annular element arranged between the plunger and the movable wall; and a hole formed at the upper portion of the annular element and communicating with the further chamber.

REFERENCES:
patent: 3481654 (1969-12-01), Grancon
patent: 3800666 (1974-04-01), Kasselmann
patent: 4494377 (1985-01-01), Sato
patent: 4610483 (1986-09-01), Matsumoto et al.
patent: 5312173 (1994-05-01), Rossigno
patent: 5437217 (1995-08-01), Castel et al.

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