| 摘要 |
PURPOSE:To enhance the sealing effect by embedding a number of glass fibers in the lip part of a seal lip consisting of ethylene tetrafluoride resin oriented in the axial direction and also radially with respect to the sliding surfaces, and by recessing its wire dia. end face. CONSTITUTION:Wires 8 consisting of a number of glass fibers are embedded in that lip part 7a of a seal lip 7 consisting of ethylene tetrafluoride resin, which is in slide contact with the periphery of a rotary shaft 3, in such an orientation as stretching along the axis and radially with respect to the sliding surfaces. That end face 8a of each wire 8 which is facing the surface of the lip part is recessed to form a recess 9. When the seal lip 7 is fixed to a housing 1 and fitted on the rotary shaft 3, a spiral groove consisting of projections and recesses is formed on the slide surface 71 of the lip part 7a. Thus hydrodynamic effect is obtained. |
