| 摘要 |
SEALING RINGS A sealing ring structure between a housing and a rotating shaft comprising a first ring member with axially opposite ends facing internally and externally of the housing and with the internal portion of the ring member having a series of internal labyrinth annular grooves disposed adjacent the shaft for retaining foreign materials within the housing. A second ring member is provided axially externally of the first ring member. The first ring member has an annular recess extending axially from its external face and the external ring has an axially extending flange that seats in the annular recess of the first member. A hole is provided in the first member that leads to the annular recess and on the underside thereof and which opens externally of the housing. The latter permits foreign matter that may move between a joint of the first and second members to be discarded through the hole. The second member is fixed to rotate with the shaft and to rotate relative to the first ring member.
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