Patent ID: 6073535
Filing Date: 2000-06-13
Classification: B60T

Abstract:
A brake system having a brake booster secured to a dash panel which separates an engine compartment from a passenger compartment in a vehicle, said booster having a housing in which a valve body with a cylindrical projection extends through said housing and a valve located in said valve body is connected to an input rod, said valve being responsive to an input force from said input rod to selectively communicate air to a chamber for creating a pressure differential across a movable wall, said pressure differential acting on said movable wall to develop a corresponding output force to effect a brake application, said air on being communicated to said chamber producing audible sounds, said brake system being characterized by a guard for said valve body comprising a bracket for off-setting said booster from said dash panel into said engine compartment; a cylindrical body having a flange on a first end and a second end, said flange being located between said brake booster and said bracket, said cylindrical body having a partition wall with a central opening located between said first end and said second end and a radial opening located between said partition wall and said second end, said input rod extending through said central opening for supplying said valve with said input force; and an end boot secured to said second end of said cylindrical body and said input rod for forming a resonant chamber within said cylindrical body, said radial opening providing unrestricted communication air from the engine compartment to said resonant chamber while said central opening defines an orifice through which air flows from the resonant chamber into said valve body, said resonant chamber dissipating audible sounds produced by the flow of air through said orifice to said chamber.