公开(公告)号：US08724256B2

公开(公告)日：2014-05-13

申请号：US13789796

申请日：2013-03-08

Applicant: Nidec Corporation

Inventor： Yoichi Sekii ,  Hiroshi Konno ,  Chiharu Fujii ,  Takuro Iguchi ,  Shuji Iwasaki

IPC: G11B17/03

CPC classification number: F16C17/107 ,  F16C33/1085 ,  F16C33/745 ,  F16C2370/12 ,  G11B19/2036 ,  H02K5/165 ,  H02K5/1677

Abstract: A bearing apparatus includes a stationary shaft, an upper annular portion, a lower annular portion, and a sleeve. An outer circumferential surface of the upper annular portion includes a cylindrical surface and an inclined surface arranged above the cylindrical surface. The cylindrical surface has an axial length smaller than that of the inclined surface of the upper annular portion. One of an upper surface of the sleeve and a lower surface of the upper annular portion includes a pumping groove array defined therein. An upper surface of a lubricating oil is defined in an upper capillary seal portion, while a lower surface of the lubricating oil is defined in a lower capillary seal portion. The upper capillary seal portion has an opening angle larger than that of the lower capillary seal portion.

Abstract translation: 轴承装置包括固定轴，上环形部分，下环形部分和套筒。 上环形部分的外圆周表面包括圆柱形表面和布置在圆柱形表面上方的倾斜表面。 圆柱形表面的轴向长度小于上部环形部分的倾斜表面的轴向长度。 套筒的上表面和上环形部分的下表面之一包括限定在其中的泵浦槽阵列。 润滑油的上表面限定在上毛细管密封部分中，而润滑油的下表面限定在下毛细密封部分中。 上部毛细管密封部分具有比下部毛细管密封部分大的开启角度。