The invention relates to a bottom bracket (1) for bicycles comprising a central pin (2), a first adapter (8) radially outer with respect to said central pin (2) and intended to be associated with a box (102) for housing the bottom bracket, a first rolling bearing (6) radially arranged between said central pin (2) and said first adapter (8), a sealing gasket (30) arranged in axially outer position with respect to said first rolling bearing (6), radially outer with respect to said central pin (2) and directly exposed to the outside. The sealing gasket (30) comprises a first axially outer end (34) provided with a first lip (31) and a second lip (32) axially more inner with respect to the first lip (31), said first lip (31) being in constant fluid-tight relationship with said central pin (2). When the sealing gasket (30) is deformed, said second lip (32) moves from a more outer radial position, in which the second lip (32) is radially outer with respect to the first lip (31) and in which the second lip (32) does not exert a fluid-tight seal on said central pin (2), to a more inner radial position, in which the second lip (32) is in fluid-tight relationship with said central pin (2).
BICYCLE BOTTOM BRACKET
FAHRRADTRETLAGER
PÉDALIER DE BICYCLETTE
2019-06-26
Patent
Electronic Resource
English