Patent ID: 8573602
Filing Date: 2013-11-05
Classification: F16J

Abstract:
1. A radial shaft seal configured for receipt in a housing and about a shaft to sealingly isolate an air-side of the shaft seal from an oil-side of the shaft seal, comprising: an annular mounting portion; an elastomeric seal body connected to said mounting portion; and a seal lip connected to said seal body, said seal lip having an annular inner sealing surface extending axially between an oil-side end and a free air-side end, said inner sealing surface having a first groove region extending along the shaft in sealed engagement therewith and a second groove region extending along the shaft in sealed engagement therewith, said first groove region and said second groove region being spaced axially from one another by an intermediate non-grooved region, said first groove region being configured to direct contamination toward said air-side and said second groove region being configured to direct lubrication toward said oil-side; said first groove region comprising a plurality of first grooves oriented at an angle to the circumferentially duration of shaft rotation; said second groove region comprising a plurality of second grooves extending substantially circumferentially along the direction of the shaft rotation; and wherein said first grooves are linearly straight and said second grooves have a first portion extending circumferentially along the direction of shaft rotation and a second portion inclined relative to said first portion.