| 摘要 |
The present invention relates to a rotary joint for a spindle for a machine tool, and more specifically, to the rotary joint for the spindle of the machine tool which can prevent crack generation by preventing high impact when a non-rotary seal member mounted on a casing retainer adheres to a rotary seal member mounted on a spindle retainer. The rotary joint (1000) for the spindle of the machine tool according to the present invention includes: the casing retainer which can move in an axial direction only by being inserted in the axial direction of a casing; an O ring which is installed between the casing and the casing retainer; the non-rotary seal member mounted at a lower part of the casing retainer; a cover inserted to a lower part of the casing; an elastic repulsion member supported by the casing retainer and the cover; the spindle retainer fastened to an upper part of the spindle rotating at high speed; and the rotary seal member which adheres to and is separated from the non-rotary seal member. A hole (1110) of the casing (1100) comprises a fluid supply hole (1930) which is controlled in an axial direction along which a fluid is discharged, so as to supply the fluid to the axial direction center. On the other hand, a protector (1900) is provided since a protector guide part (1920) protrudes in an axial direction toward an inner diameter of the hole (1110) and then is inserted into a protector insertion hole (1210) formed at an axial direction center of the casing retainer (1200) for the casting retainer to be guided. A fluid friction part (1220) rubbed by the fluid discharged from the fluid supply hole (1930) of the protector is comprised at the protector insertion hole. |
