| 摘要 |
<p>A main spindle device (1) includes: a housing (20, 30) having an air supply passage (AL1, AL2); a spindle that is inserted into the housing (20, 30) and supported by a bearing (J) so as to be able to rotate relative to the housing (20, 30); and an air sealing member (50) that is positioned between an outer circumferential surface of the spindle and the housing (20, 30) on a front side with respect to the bearing (J) along a rotation axis (ZT) of the spindle, has a substantially annular shape, and is detachably fixed to the housing (20, 30) with an inner circumferential surface of the air sealing member (50) facing the outer circumferential surface of the spindle, wherein air supplied from the air supply source through the air supply passage (AL1, AL2) is discharged into a gap between the outer circumferential surface of the spindle and the housing (20, 30), thereby effecting non-contact air sealing at least between the inner circumferential surface of the air sealing member (50) and the outer circumferential surface of the spindle.</p> |
