Combined seal ring with encoder and rolling bearing unit with encoder

Patent metadata

Field	Value
Publication number	US-2016245409-A1
Application number	US-201415029766-A
Country	US
Kind code	A1
Filing date	Sep 19, 2014
Priority date	Oct 16, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

A slinger has a substantially L-shaped cross-section and includes a rotating cylindrical portion and a rotating circular ring portion. An inner circumferential surface of the rotating cylindrical portion is a stepped cylindrical surface in which a large-diameter portion formed at a portion close to the rotating circular ring portion and a small-diameter portion formed in the remainder are continuously connected by a stepped portion. The encoder supported by the rotating circular ring portion is formed by solidifying and securing a molten permanent magnet material in a state that a molding die collides with the stepped portion. An outer diameter of a hub is defined as φD, an inner diameter of the small-diameter portion in a free state is defined as φd 1 , and an inner diameter of the encoder in a free state is defined as φd 2 , a relationship of φd 1≦φ d 2 <φD is satisfied.

First 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 the remainder 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; and 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 1 , and an inner diameter of the encoder in a free state is defined as φd 2 , a relationship of φd 1 ≦φd 2 <φD is satisfied.

2 . The combined seal ring with an encoder according to claim 1 , wherein a radial thickness of the rotating cylindrical portion is smaller in a portion matching the large-diameter portion than in a portion matching the small-diameter portion in the axial direction.

3 . The combined seal ring with an encoder according to claim 1 , wherein at least a part in the axial direction of a portion having a smallest inner diameter in the inner circumferential surface of the encoder is located farther from the rotating cylindrical portion in the axial direction than a side surface to which the encoder is supported and fixed in the rotating circular ring portion.

4 . The combined seal ring with an encoder according to claim 1 , wherein a portion having a smallest inner diameter in the inner circumferential surface of the encoder is constituted by a cylindrical surface portion of which the inner diameter does not vary in the axial direction.

5 . A rolling bearing unit with an encoder comprising:
an inner race member that has an inner raceway on an outer circumferential surface thereof; an outer race member that has an outer on an inner circumferential surface; a plurality of rolling elements that are disposed to be rollable between the inner raceway and the outer raceway; and a combined seal ring that seals off an end opening of an annular space present between the outer circumferential surface of the inner race member and the inner circumferential surface of the outer race member, wherein the combined seal ring is the combined seal ring with an encoder according to claim 1

Assignees

• Nsk Ltd

Inventors

• Kato Meiji

Classifications

• F16C19/08

  with two or more rows of balls · CPC title

• F16C2326/02

  Wheel hubs or castors · CPC title

• F16J15/3492 Primary

  with monitoring or measuring means associated with the seal · CPC title

• F16C33/7823

  of sealing lips · CPC title

• F16J15/3456

  without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip · CPC title