Rotation shaft seal

Abstract

A rotation shaft seal provided with a rubber sealing portion having a sliding portion which contacts a surface of a rotation shaft and a supporting metal which supports the rubber sealing portion on a low-pressure side. The sliding portion deforms along a peripheral direction of the surface of the rotation shaft as to be concavo-convex wave form when receiving pressure.

1 . A rotation shaft seal provided with a rubber sealing portion having an axis-orthogonal wall portion, having a sliding portion which contacts a surface of a rotation shaft on an inner peripheral edge, and a back face supporting metal having an axis-orthogonal plate portion which supports the axis-orthogonal wall portion from a low-pressure side, comprising a construction in which supporting force of the axis-orthogonal plate portion supporting the axis-orthogonal wall portion from the low-pressure side is increased and decreased along a peripheral direction as position of the sliding portion draws a concavo-convex wave pattern along the peripheral direction on the surface of the rotation shaft under a pressure-receiving state.  
   
   
       2 . The rotation shaft seal as set forth in  claim 1 , wherein an inner peripheral edge of the axis-orthogonal plate portion of the back face supporting metal is formed concavo-convex.  
   
   
       3 . The rotation shaft seal as set forth in  claim 1 , wherein a concavo-convex portion is formed on a sealing portion supporting face of the axis-orthogonal plate portion of the back face supporting metal along the peripheral direction.