Motors: expansible chamber type – Relatively movable working members with one having motive... – One working member forms movable chamber for another
Patent
1998-09-30
2000-09-05
Lopez, F. Daniel
Motors: expansible chamber type
Relatively movable working members with one having motive...
One working member forms movable chamber for another
91376R, 91519, F15B 917
Patent
active
061126373
ABSTRACT:
An automatically operable negative pressure type booster can be applied for a front stage pressurizing function in a braking fluid pressure control apparatus with braking and steering control. The booster includes a housing, a movable wall dividing the housing interior into a front chamber and a rear chamber, a valve housing outputting a braking force to an output rod, an input member, and a control valve. The output rod can be divided into a first member and a second member. The booster further includes an auxiliary movable wall which can be engaged with the first member, a partition wall forming an auxiliary variable pressure chamber behind the auxiliary movable wall, and an electromagnetic valve unit selectively communicating the auxiliary variable pressure chamber with the front chamber or atmosphere. Further, a negative pressure type booster which is able to achieve the smooth flow of air from a space portion into a variable pressure chamber includes a housing, a movable wall, and a plate forming a space portion between the housing and the plate. An air passage retractable in the axial direction is disposed in a constant pressure chamber and communicates the space portion with a variable pressure chamber. An electromagnetic valve unit selectively communicates the variable pressure chamber with a negative pressure source or atmosphere through the space portion and the air passage. One end portion of the air passage is engaged in an airtight manner with only the plate member.
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Miwa Akihiko
Tsubouchi Kaoru
Aisin Seiki Kabushiki Kaisha
Lopez F. Daniel
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