| 摘要 |
PURPOSE: An electronic brake booster is provided to freely regulate the rear pressure of a booster from engine negative pressure to atmospheric pressure by reforming the structure of a movable piston of a tandem booster. CONSTITUTION: An electronic brake booster is composed of space(9') formed by valve members(2,3) in a booster valve housing(1), wherein a movable piston(4) is placed, air flowed into the rear of the booster according to the movements of the movable piston which is moved according to a pilot pressure functioning chamber formed at the left of the piston, the rear pressure of the booster regulated in proportion to pilot pressure, and a sliding part of the movable piston making a sealing member as an O-ring keep airtight, being bellows or a diaphragm type, and having sectional area difference as a feedback sectional area is smaller than pilot pressure functioning area.
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