| 摘要 |
A rock drill bit includes at least one leg about which a roller cutter is rotatably mounted. A ring-shaped seal is disposed between an end surface of the leg and a sealing surface of the roller cutter. The seal is arranged coaxially with respect to an axis of rotation of the roller cutter and is formed of an elastic material and a relatively rigid material embedded within the elastic material. The elastic material defines first and second surfaces which engage the leg and the roller cutter, respectively. Either the leg or the seal includes circumferentially spaced recesses which receive respective projections formed in the other of the leg and the seal, for locking the seal to the leg against rotation relative thereto. |
