Rotating shaft device and machine tool

A machine tool for machining a workpiece by relatively moving a tool and the workpiece to each other, comprising:

• a table for mounting the workpiece;
• a feed mechanism for driving X-, Y- and Z-feed shafts for relatively moving a spindle to which the tool is mounted and the table to each other;
• a spindle to which the tool is mounted and is rotationally supported by a spindle head;
• a bearing for rotationally supporting the spindle to the spindle head;
• a plurality of lubricant impregnated members, which are disposed in a peripheral portion of the spindle around the center axis thereof and impregnated with a lubricant to be supplied to the bearing and provided in the rotating spindle, for separating and discharging the lubricant by centrifugal force due to the rotation of the spindle;
• and
• a lubricant supplying passage for fluidly connecting a space in or adjacent the bearing to the lubricant impregnated members to supply the lubricant which has been separated and discharged from the lubricant impregnated members.

A machine tool for machining a workpiece by relatively moving a tool and the workpiece to each other, comprising:

• a feed mechanism for driving X-, Y- and Z-feed shafts for relatively moving a spindle and a table to each other;
• a bearing for rotationally supporting the feed shafts of the feed mechanism;
• a plurality of lubricant impregnated members, which are disposed in a peripheral portion of the feed shafts around the center axis thereof and impregnated with a lubricant to be supplied to the bearing, and provided in the rotating feed shafts, for separating and discharging the lubricant by centrifugal force due to the rotation of the feed shafts;
• and
• a lubricant supplying passage for fluidly connecting a space in or adjacent the bearing to the lubricant impregnated members to supply the lubricant which has been separated and discharged from the lubricant impregnated members.