公开(公告)号：US20210111600A1

公开(公告)日：2021-04-15

申请号：US16981040

申请日：2019-03-27

申请人： PANASONIC INTELECTUAL PROPERTY MANAGEMENT CO., LTD.

发明人： Motohiro MORISHITA ,  Satoru MURAO ,  Munetada SATOU ,  Ryutaro ISHIDA

IPC分类号： H02K1/27 ,  H02K7/06 ,  H02K1/28

摘要： A cylindrically-shaped motor shaft forming a rotational axis of a motor includes a processing target region, a spiral groove, and a reverse spiral groove intersecting with the spiral groove at at least one point. The processing target region has a first end closer to a bottom face of the cylindrical shape and second end closer to a top face side of the cylindrical shape. At least one turn of the spiral groove surrounds an outer circumferential surface in the processing target region. The reverse spiral groove surrounds the outer circumferential surface in the processing target region in a direction reverse to that of the spiral groove.