Patent ID: 6357560
Filing Date: 2002-03-19
Classification: F16D,F16H

Abstract:
A servo assembly for engaging a brake band in a vehicle having an automatic transmission, said servo assembly comprising:a piston which selectively engages said brake band, said piston including a first portion and a second portion; a housing having an interior area, said housing at least partially surrounding said piston; an interior member which extends from said housing into said interior area of said housing thereby separating said interior area into a first area and a second area; a first pressurized supply which supplies a first amount of hydraulic fluid through a first opening in said housing to said first area wherein said first amount of fluid applies pressure to said first portion of said piston; a second pressurized supply which is separate from said first supply, which supplies a second amount of hydraulic fluid through a second opening in said housing to said second area wherein said second amount of fluid applies pressure to said second portion of said piston; and a spool which prevents said first amount of hydraulic fluid from entering said second portion of said piston.