Patent ID: 6755117
Filing Date: 2004-06-29
Classification: B60T

Abstract:
A tandem vacuum booster assembly for a vehicle comprising:a rear housing adapted to be mounted to the vehicle; a front housing mounted to said rear housing to define an interior chamber; a divider disposed between said rear housing and said front housing for partitioning said interior chamber into a primary chamber and a secondary chamber; a primary diaphragm disposed between said rear housing and said divider for partitioning said primary chamber into a primary high pressure chamber and a primary vacuum chamber; a secondary diaphragm disposed between said divider and said front housing for partitioning said secondary chamber into a secondary high pressure chamber and a secondary vacuum chamber; a tie rod extending between said front and rear housings and through said primary and secondary chambers; and a sleeve at least partially disposed about said tie rod and extending between said primary high pressure chamber and said secondary high pressure chamber and being at least partially spaced from said tie rod to define an air passage between said tie rod and itself such that air can be transferred between said high pressure chambers, wherein said sleeve comprises a first end and a second end and has a constant diameter between said first and second ends.