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A special version of the combi seal is the cassette seal. Here, the seal rotates on its sleeve but not on the shaft, which avoids expensive maintenance. The high rotation speed of the modern engines and the increase of the temperatures of the contact surface between seal and shaft made it necessary to develop new materials and solutions. The best solution compared to the lip seal designed in FKM (Fluoro elastomer) is the utilization of PTFE (Polytetrafluorethylene).
The PTFE material can withstand temperatures higher than those of the standard oil seal. Moreover, no elastomer oil seal can work through extended periods without lubrication, while the PTFE seal can work also in conditions of insufficient oil inflow. With PTFE, because of the wide contact area (not a corner seal), the depth of the wear groove in the shaft is reduced and generates less radial force compared to a standard oil seal, decreasing the wear on the shaft.
The news come from www.bossgoo.com
