Patent ID: 8764020

Claim:
A shaft seal device for sealing a space between a housing and a rotating shaft, the shaft seal device comprising: a cartridge fitted into the internal periphery of a shaft hole of said housing; a first lip seal member fitted in a non-bonded state to said cartridge; a case fitted in a non-bonded state to said first lip seal member; a second lip seal member crimped onto and held by said case, and a backup ring for supporting the second lip seal member; and an elastically deformable adapter fitted into said cartridge on a sealing fluid side of said first lip seal member, wherein said adapter is annular in overall shape with a cross-sectional shape that is substantially the shape of the letter “c,” and has an external peripheral flange in contact with an internal peripheral surface of said cartridge and an internal peripheral flange and web for pressing said first lip seal member; and said external peripheral flange has a tapered shape that decreases in diameter toward said web side, a distal end part of the outside diameter side describing an acute angle, and being formed to a diameter that is greater than the diameter of the internal peripheral surface of said cartridge, wherein said distal end part of the outside diameter side bites into the internal peripheral surface of said cartridge.