Patent ID: 6181513
Filing Date: 2001-01-30
Classification: F16C,G11B,H02K

Abstract:
A motor including a double row bearing apparatus for supporting a rotor hub rotatably on a base characterized in that: the double row bearing apparatus includes;a two-stepped shaft having an enlarged diameter shaft portion and a reduced shaft portion,a sleeve outer race disposed around the shaft through a pair of first and second rows of rotating bodies interposed between the shaft and the sleeve, outer race,rotating bodies for the first row are adapted to be interposed between an outer peripheral rolling contact groove formed directly on the outer peripheral surface of the enlarged diameter shaft portion of the stepped shaft and a first inner peripheral rolling contact groove formed on the inner peripheral surface of the sleeve outer race,rotating bodies for the second row are adapted to be interposed between an outer peripheral rolling contact groove formed on an outer peripheral surface of an inner race fitted around the reduced shaft portion of the stepped shaft and a second inner peripheral rolling contact groove formed on the inner peripheral surface of the sleeve outer race,at the side of the first row of the rotating bodies, inner and outer annular sealing plates are provided to leave a slight clearance between the inner or outer peripheral surface of each sealing plate and the outer peripheral surface of the enlarged diameter shaft portion or the end portion of the sleeve outer race to provide a labyrinth seal on one side of the sleeve outer race, and at the side of the second row of rotating bodies, inner and outer annular sealing plates are provided to leave a slight clearance between the inner or outer peripheral surface of each sealing plate and the inner race or the end portion of the sleeve outer race to provide a labyrinth seal on the other side of the sleeve outer race.