| 摘要 |
Sealing rings of the type comprising a first ring member and a second ring member. The first ring member has an external radially extending face, an internally radially extending face, an inner axially extending face, and an outer axially extending face. The inner axially extending face has a series of internal labyrinth annular grooves and an axially extending groove joining the internal labyrinth annular grooves and opening to the external radially extending face. The internal radially extending face has an axially extending first annular recess having parallel inwardly radially facing and outwardly radially facing walls. The second ring member has an axially extending first annular flange having an outwardly facing portion and an inwardly facing portion adapted and constructed to be complementary with the recess. The sealing rings are improved in that they further comprise at least one of the following characteristics: a. Each of the internal labyrinth annular grooves is deeper than its adjacent groove located on the internal radially extending face side thereto; b. A portion of the external radially extending face is axially extended; or c. The external radially extending face of the first ring member has an axially extending second annular flange having parallel outwardly facing and inwardly facing portions and the second ring member has an axially extending second annular recess adapted and constructed to be complementary with the second flange.
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