Patent ID: 8353519
Filing Date: 2013-01-15
Classification: F16C,F16J

Abstract:
1. A sealing device comprising: a stationary side installation ring tightly fitted and fixed to a stationary side member; a rotation side installation ring tightly fitted and fixed to a rotation side member; a stationary side lip integrally provided on the stationary side installation ring and slidably brought into close contact with the rotation side installation ring by its tip end portion; rotation side lips integrally formed on the rotation side installation ring and slidably brought into close contact with the stationary side installation ring by their tip end portions; and a pulsar ring for a rotary encoder made of a synthetic resin or rubber-like elastic material, mixed with magnetic powder, integrally formed on the rotation side installation ring, and magnetized to be multipolar, wherein the rotation side installation ring is constituted by first and second rotation side installation rings which are fitted and attached to each other, the rotation side lips are provided on the first rotation side installation ring arranged at a relatively inner side, and the pulsar ring is provided on the second rotation side installation ring arranged at a relatively outer side, the pulsar ring is provided on an outer surface of the second rotation side installation ring, the first rotation side installation ring is constituted by a first inner peripheral tube portion in which an outer peripheral surface is slidably brought into close contact with an inner periphery of the stationary side lip, and a first flange extending outwardly from one end portion of the first inner peripheral tube portion, the second rotation side installation ring is constituted by a second inner peripheral tube portion in which an outer peripheral surface is fitted and attached integrally to the first inner peripheral tube portion of the first rotation side installation ring, and a second flange extending outwardly from one end portion of the second inner peripheral tube portion and superposed with the first flange, of the first rotation side installation ring in an axial direction, the pulsar ring is bonded by vulcanization to an outer surface of the second flange of the second rotation side installation ring, and the rotation side installation ring is pressure-inserted and fitted to an outer peripheral surface of the rotation side member by the second inner peripheral tube portion of the second rotation side installation ring.