Patent ID: 7828300
Filing Date: 2010-11-09
Classification: F16J

Abstract:
1. A seal for engaging a shaft, comprising: a main seal directed toward a space to be sealed, the main seal including a main lip adapted to be slidably and tightly contacted with the shaft; a frictional lip axially spaced from the main lip in a direction toward the space to be sealed and adapted to have a circumferentially discontinuous contact surface with the shaft, including a plurality of axially extending recesses to permit circulation of fluid to be sealed through said frictional lip and allow a pressure of the fluid on an outer peripheral face of the frictional lip to be balanced by the oil that passes through the recesses toward the main lip, said main lip having a circumferentially continuous contact surface and a smaller inner diameter than said frictional lip; and a support lip axially spaced from the main lip in a direction away from the space to be sealed and adapted to be slidably and tightly contacted with the shaft; and a dust seal directed toward an external space.