Patent ID: 8256772

Claim:
A lip type seal inhibiting a sealed fluid in a machine from leaking to an atmospheric air side by being installed to an inner periphery of a shaft hole of a housing so as to slidably come into close contact with a peripheral surface of a shaft, the lip type seal comprising: a cartridge having a tubular portion fitted to an inner periphery of said shaft hole; a first lip seal member made of a rubber-like elastic material and fitted in a non-bonding manner to said cartridge; a case fitted in a non-bonding manner to said first lip seal member; a second lip seal member made of a resin and a backup ring supporting the second lip seal member which are retained by caulking axially inside said case; and an adapter fitted to said cartridge at a sealed fluid side of said first lip seal member, wherein said cartridge integrally has an inward flange portion on an atmospheric air side end portion of the tubular portion, wherein said first lip seal member integrally has a cylinder portion fitted to an inner peripheral side of the tubular portion of said cartridge, a radial portion provided on a sealed fluid side end portion of said cylinder portion, and a seal lip provided on an inner peripheral end portion of said radial portion, wherein said case integrally has a tubular portion fitted to a portion between said radial portion and the flange portion of the cartridge in an inner peripheral side of the cylinder portion of said first lip seal member, a first flange portion provided on the sealed fluid side end portion of said tubular portion in such a manner as to come into contact with said radial portion, and a second flange portion provided on the atmospheric air side end portion of said tubular portion in such a manner as to come into contact with the flange portion of said cartridge, said second lip seal member and the backup ring are retained by caulking between said first and second flange portions, and wherein said adapter prevents said first lip seal member from coming off from said cartridge by being fitted to said cartridge at the sealed fluid side of said first lip seal member.