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US 4,377,966 AGranted
Servo boosters for vehicle braking systems
AssigneeLucas Industries Limited
InventorsDavid J. Parker, Eric M. Lilley
Life of this patent
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AssigneeLucas Industries Limited
InventorsDavid J. Parker, Eric M. Lilley
Estimating the term…
In a servo booster for a vehicle braking system, of the kind having a tie rod for relieving the booster housing of braking reaction forces which extends through the movable wall(s) of the booster, the movable wall is sealingly connected to a wall of the housing by a bellows located substantially coaxially about the tie rod. The bellows has at least one integral reinforcing rib which completely encircles the tie rod. The rib resists ballooning of the bellows and also guides the bellows along the tie rod. In the case of a tandem booster having a stationary partition wall between a pair of movable walls, the interior of a bellows connecting the rear movable wall to the partition wall provides fluid communication between the chambers bounded by the rears of the movable walls. Fluid communication between the other two chambers is provided via a tubular member integral with the front movable wall and extending sealingly through the partition wall.
A servo booster for a vehicle braking system, comprising a booster housing, first and second co-acting movable walls located within said housing, a partition wall of said housing located between said movable walls, a stationary force transmitting member extending through said movable walls and said partition wall, a surface of said second movable wall and a surface of said partition wall defining between them a first chamber, a surface of said first movable wall remote from said partition wall bounding a second chamber, seal means sealing the outer peripheries of said movable walls to the housing, and a bellows located substantially co-axially about said force transmitting member and sealingly connecting said first movable wall to said partition wall, an inner surface of said bellows and an outer surface of said force transmitting member defining between them a space by which said first chamber is in fluid communication with said second chamber.
Dependencies are inferred from the claim text.