| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid feed rotary joint having no relative displacement between a stator part and a rotor part and providing a structure superior in the sealing performance in relatively and axially moving these both parts in the stator side and the rotor side relatively moving in the axial direction. SOLUTION: For example, in a main spindle cooling device for a machine tool, a stator part 50 is axially movably provided in a housing 8 via a slide ball bearing 27, and a first feed side passage 60 and a first return side passage 61 are provided in the housing 8 side and the rotor part 51, The rotor part 51 is integrally provided in a draw bar and provided with a second feed side passage 67 and a second return side passage. 68 connectable to the stator part 50 and the draw bar 22 side. Liquid feed passages 60, 61 of the stator part 50 and liquid feed passages 67, 68 of the rotor part are communicated with each other by relatively rotatably rotary seal parts 65, 66, while securing the rotary seal parts 65, 66 and the liquid feed passages 60, 61 of the stator part 50 are communicated with each other in a moving rage of the housing 8 and the slide ball bearing part 27 at all times.
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