Spindle device

A spindle device comprising:

• a spindle housing;
• a spindle shaft configured to be rotatably supported inside the spindle housing;
• a rotating member disposed at one end of the spindle shaft and configured to be rotatable in conjunction with rotation of the spindle shaft;
• a spindle mount having an insertion cavity into which the spindle housing is inserted along an axial direction of the spindle shaft;
• an annular flange portion projecting outward from an outer peripheral surface of the spindle housing and configured to be detachably fixed to an end of the spindle mount that is closer to one opening of the insertion cavity;
• a cover member configured to cover a surface of the flange portion on one end side of the spindle shaft and an outer peripheral surface of the spindle housing that extends from the surface of the flange portion toward the one end side of the spindle shaft;
• and
• a flow path formed in the cover member and configured to allow a coolant to flow therethrough,
• wherein the flow path includes:
• a first conduit configured to allow outside of the cover member to communicate with the surface of the flange portion covered by the cover member;
• and a second conduit configured to allow the outside of the cover member to communicate with the outer peripheral surface of the spindle housing covered by the cover member;
• and
• the coolant flowing from the outside of the cover member into one of the first and second conduits flows out into another one of the first and second conduits through a relay passage formed between the cover member and the spindle housing.