Patent ID: 6829976
Filing Date: 2004-12-14
Classification: B60T

Abstract:
A brake booster (10) having a first shell (12) joined to a second shell (14) by deforming a first peripheral surface (13) on the first shell (12) with respect to a second peripheral surface (36) on the second shell (14) to compress a first bead (100, 200) on a diaphragm (102,202) secured to a movable wall (76) to define a housing while sealing an interior thereof from the surrounding environment to create a front chamber (50) and a rear chamber (52) within the housing, said movable wall (76) carrying a valve arrangement (56) that responds to a brake input to interrupt communication between said front chamber (50) and said rear chamber (52) and thereafter open communication between said rear chamber (52) and the surrounding environment to create a pressure differential across said movable wall (76) to develop an output force for effecting a brake application, said movable wall (76) being characterized by a disc (74) having an annular groove (70) located adjacent a peripheral surface (72) and said diaphragm (102,202) being characterized by a cylindrical body (116,216) having said first bead 100,200) on a first end (106,206) and a second bead (104,204) on a second end (108,208), said first bead (100,200) and said second bead (204,204) each having an initial oval shape, said first bead oval shape being stretched into a circular shape for retention between said first and second peripheral surfaces while said second bead oval shape being stretched into a circular shape for retention in said annular groove (70) to define a connection between said movable wall (76) and said first (13) and second (36) peripheral surfaces in sealing said front chamber (50) from said rear chamber (52).