Patent ID: 9695943
Date: 2017-07-04
CPC Classifications: F16C,F16J

Claim:
1. A combined seal ring with an encoder being used to seal off an end opening of an annular space which is present between an outer circumferential surface of an inner race member rotating under use and an inner circumferential surface of an outer race member not rotating under use and to detect a rotation speed of the inner race member and comprising: a seal ring that is internally fitted and fixed to the outer race member; a slinger that is externally fitted and fixed to the inner race member; and an encoder that is supported and fixed to the slinger, wherein: the seal ring includes a metal insert and an elastic member having at least one seal lip bonded to the entire circumference of the metal insert; the slinger has a substantially L-shaped cross-section formed of a metal plate and an annular shape as a whole and includes a rotating cylindrical portion that is externally fitted and fixed to the inner race member by tight fit and a rotating circular ring portion that is bent outward in a radial direction from an axially one-end edge of the rotating cylindrical portion; the encoder is formed of a permanent magnet in which an S pole and an N pole are alternately arranged in a circumferential direction, is formed in a circular ring shape as a whole, and is supported and fixed to a side surface opposite to a side surface of the rotating circular ring portion facing the seal lip; an inner circumferential surface of the rotating cylindrical portion is a stepped cylindrical surface in which a large-diameter portion formed at an axially one-end side of the rotating cylindrical portion and a small-diameter portion formed in at an axially opposite end side from the one-end side are continuously connected by a stepped portion having a circular ring shape; the encoder does not have a lip on an inner circumferential surface thereof and is formed by solidifying and securing a molten permanent magnet material to the slinger in a state in which the slinger is disposed in a molding die such that a part of the molding die collides with the stepped portion; when an outer diameter of a portion to which the slinger is externally fitted and fixed on the outer circumferential surface of the inner race member is defined as φD, an inner diameter of the small-diameter portion in a free state is defined as φd the inner circumferential surface of the encoder contacts with the inner race member with an interference in a state that the slinger is externally fitted and fixed to the inner race member.