公开(公告)号：US5559382A

公开(公告)日：1996-09-24

申请号：US129658

申请日：1993-09-30

申请人： Yoshito Oku ,  Shozo Ibara ,  Shigeharu Sumi ,  Hiromasa Fujii

发明人： Yoshito Oku ,  Shozo Ibara ,  Shigeharu Sumi ,  Hiromasa Fujii

IPC分类号： F16C17/02 ,  F16C17/10 ,  F16C33/10 ,  G11B19/20 ,  F16C32/06 ,  H02H7/00 ,  H02H7/08

CPC分类号： F16C33/107 ,  F16C17/026 ,  F16C17/107 ,  G11B19/2009 ,  F16C2370/12

摘要： A motor having a bracket with a stator coil for generating a magnetic field and a rotor hub with rotor magnets for receiving a rotation force from the magnetic field generated by the coil. Upper and lower dynamic pressure radial bearings are formed in between the sleeve and the rotary shaft. The lower end surface of the rotary shaft is formed with a spiral groove in which a lubricating fluid is filled to form a dynamic pressure thrust bearing. The spiral groove is formed by a circular hole at the center of the shaft, and a plurality of curved grooves each curving from the circular hole to the direction opposite to the rotation direction of the shaft and gradually increasing its width toward the outer circumference of the lower end surface of the shaft without reaching the circumference. The spiral groove functions to move the lubricating fluid outward in the radial direction from the center of the shaft, when the shaft rotates.

摘要翻译： 具有用于产生磁场的具有定子线圈的支架的电动机和具有用于从线圈产生的磁场接收旋转力的转子磁体的转子毂。 上下动压径向轴承形成在套筒和旋转轴之间。 旋转轴的下端面形成有填充有润滑液的螺旋槽，形成动压推力轴承。 螺旋槽由轴的中心的圆孔形成，并且形成有多个弯曲槽，其从圆孔朝向与轴的旋转方向相反的方向弯曲，并且逐渐增大其朝向外周的宽度 轴的下端面没有到达圆周。 当轴旋转时，螺旋槽用于使润滑流体从轴的中心沿径向向外移动。