Patent ID: 6168315
Filing Date: 2001-01-02
Classification: F16C,G01P

Abstract:
A rolling bearing unit with tone wheel comprising: an outer ring member which is stationary during use and has an inner peripheral surface formed with an outer ring raceway, an inner ring member which is rotatable during use and has an outer peripheral surface formed with an inner ring raceway, a plurality of rolling elements provided between the outer ring raceway and inner ring raceway, a seal ring fitted and secured into the inner peripheral surface at an end portion of the outer ring member to cover a gap extending circumferentially between the inner peripheral surface of the outer ring member and the outer peripheral surface of the inner ring member at the end portion thereof, a tone wheel made from a magnetic plate in a generally annular shape to have a magnetic property changing circumferentially alternatively with a uniform interval and fitted and secured to the outer peripheral surface at the one end of the inner ring member, a slinger made in a generally annular shape and in a L-shape in cross section, and having a radially inner cylindrical portion formed in its inner peripheral edge portion and fitted onto the outer peripheral surface at the end of the inner ring member and a radially outer circular ring portion bent from an outside end edge of the radially inner cylindrical portion to extend radially outwards, the seal ring having a generally annular reinforcing metal in a L-shape in cross section provided on the inner peripheral surface of the end portion of the stationary outer ring member, the reinforcing metal having an outer peripheral edge portion formed with a radially outer cylindrical portion fitted into the inner peripheral surface of the end portion of the outer ring member, and a radially inner circular ring portion bent from the radially outer cylindrical portion extending radially inwards with reference to the inner peripheral surface of the end portion of the outer ring member at a position axially outer of the rotatable circular ring portion of the slinger, the circular ring portion of the reinforcing metal having a seal member fixed generally along the periphery thereof, and having seal lips with tip ends placed in sliding contact with the slinger, at least one seal lip having its tip end in sliding contact with an inside face of the circular ring portion of the slinger, and the tone wheel having an outer peripheral edge portion formed with an engagement portion thereon and provided adjacent to an outside face of the rotatable circular ring portion with the engagement portion engaged with the outer peripheral edge of the circular ring portion of the slinger.