Abstract:

The life span of cone bits is almost directly decided by the life of bit journals, which depends in great degree on the life of their seals. To enhance the reliability of journal seal of cone bit, this paper presented the face-radial combination sealing structure, that is to say, end-face and radial seal was arranged in one bit simultaneously. The design of sealing structures were analyzed and optimized with the nonlinear finite element methods, and the new seal mate was designed. Theoretically and practically, it provided that the new seal combination structure can adapt to the developing trend of high speed cone bit in lubricating system of journal seal.

Key words: cone bit, sealing, dishing ring, O-ring, reliability