| 摘要 |
PROBLEM TO BE SOLVED: To improve sealing performance of a swivel joint without increasing the number of part items and manufacturing labor and time by making it possible to effectively prevent oil leakage, even if the lower end of an outer sleeve is not closed with a bottom cover. SOLUTION: In the swivel joint of a revolving working machine in which a shaft 34 of the longitudinal direction having a plurality of shaft oil paths 33 A to 33H at the inside and an outer sleeve 36 which is freely rotatably externally fitted into a drum part 35 of this shaft 34 are provided, a plurality of annular grooves 42A to 42H with which each shaft oil path 33A to 33H is communicated are formed at intervals in the longitudinal direction on the sliding surface of the drum part 35 of the shaft 34 and the outer sleeve 36, a sealing member 43 oiltightly sealing each of these annular grooves 42A to 42H is interposed and a sleeve oil path which is communicated with each annular groove 42A to 42H is formed at the outer sleeve 36, the annular grooves 42G, 42H located at uppermost and lowermost locations of the plurality of annular grooves 42A to 42H are set as hydraulic routes for low pressure.
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