| 摘要 |
<p>The present invention relates to a rock drill bit for rotary crushing machining of rock. The drill bit comprises legs (10) each carrying a bearing journal (11) provided with bearing surfaces (26, 27) in order to via bearing elements cooperate with races in a thereby rotatable roller cutter equipped with buttons or cutting insert. The leg comprises a tail (30) and seal means (40) intended to counteract entrance of drill cuttings into the bearings, said seal means (40) in addition being intended to retain bearing grease. The seal means (40) is concentrically provided around the bearing journal (11) as well as intended to slide against the roller cutter (12). The bearing journal (11) and the seal means (40) comprise cooperating locking means provided to counteract rotation of the seal means relative to the bearing journal. The invention also relates to a seal means for a rock drill bit.</p> |
