| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a main spindle device, in which without fitting a sealing member onto a main spindle, a labyrinth-like complex labyrinth seal portion is formed in a gap between the main spindle and a housing, so that it is possible to further suppress the entry of cutting fluid such as coolant into the gap between the main spindle and the housing. <P>SOLUTION: In this main spindle device 1 provided with the housing and the main spindle, a labyrinth-forming annular groove MR is formed, in the circumferential direction of the main spindle 10, on the outer circumferential surface of a protruding portion of the main spindle 10 that protrudes from the housing on the front side. A housing lid member 40 having a protruding portion 40T that is inserted into the radial direction of the main spindle 10 so as not to contact the labyrinth-forming annular groove MR all around the labyrinth-forming annular groove MR is fixed to the housing on the front side thereof and forms a labyrinth seal portion between the protruding portion 40T and the labyrinth-forming annular groove MR. The housing lid member 40 is constructed so that the housing lid member can be divided into at least two pieces with respect to the circumferential direction of the labyrinth-forming annular groove MR. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
