| 摘要 |
FIELD: mining.SUBSTANCE: sealing unit is equipped with a spring element, arranged in the form of a collet bushing with a conical section with a top at the side of the bit axis. The conical section is installed between sealing rings, radial channels for balls of a lock bearing and stop ledges at the inner surface arranged in the circular groove. The circular groove is made on the external surface of the journal, besides, the top of the conical section of the collet bushing is arranged at the side of the bit axis.EFFECT: increased serviceability due to reliable sealing and increased service life of a bit as a whole.2 cl, 1 dwg |
