ROTARY JOINT SUPPORT STRUCTURE PART, MAIN SHAFT OF MACHINE TOOL, AND ELECTRIC MOTOR

摘要

PROBLEM TO BE SOLVED: To easily clean a drain hole and a notch part.SOLUTION: A rotary joint support structure part (1) includes: rotary joint storage parts (12a and 12b) surrounding a contact part between a rotation side member (22) and a stationary side member (23); at least one drain holes (5 and 24) extending from the outside to the rotary joint storage part; a first cleaning passage (31) communicated with the rotary joint storage parts (12a and 12b); a hollow shaft storage part (12c) surrounding a hollow shaft (9) and a hollow shaft surrounding part (17); at least one notch part (29) formed so as to communicate the outside with the hollow shaft storage part; and a second cleaning passage (32) corresponding to at least one notch part and formed in a housing.SELECTED DRAWING: Figure 3