| 摘要 |
PURPOSE: A diaphragm bellows of a power brake for a vehicle is provided to improve performance, and to cut down expenses by minimizing loss from friction between the diaphragm and a tube with modifying the structure. CONSTITUTION: A diaphragm(31) is installed in a vacuum housing of a booster by interlocking with a power piston to separate a vacuum chamber(2) and an atmospheric chamber(5). A bellows(30) for sealing has a first lip seal inclined in the front of the bellows, and a second lip seal(35) extended elastically to the rear part from the first lip seal to contact to a tube(3) with forming plural protrusions(33). Friction resistance is reduced with forming protrusions on a friction surface. Friction between the bellows and the tube is minimized, and lowering of performance is prevented.
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