Patent ID: 6848352

Claim:
A pneumatic brake booster comprising an envelope formed of two shells ( 3 , 5 ) to define an interior volume that is divided into two chambers by a skirt mounted to sealingly slide therein, said skirt ( 7 ) being moved by a pressure difference brought about through the operation of a three-way valve ( 17 ) that is located in a pneumatic piston that is located along a central axis of said skirt, said booster including means ( 53 ) for reducing noise created during the operation of said three-way valve ( 17 ) characterized by a layer of elastomer material that is located between one of said two shells ( 3 , 5 ) and a rigid element, said means ( 53 ) having the form of a cover with a central orifice ( 56 ) and a radially outward extending rim ( 59 ) with a frustoconical shape on a radial end and a rubber element defined by an annular cap that is attached to said radial end, said annular cap being a rubber element that is inserted between said radial end of the rim ( 59 ) and the envelope ( 1 ) of the booster to engage one of said shells ( 3 , 5 ) and thereby dampen noise carried through said engaged shell ( 3 , 5 ).