Sealing devices for anti-friction bearing

Patent metadata

Field	Value
Publication number	US-9751576-B2
Application number	US-201415022259-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 20, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A rolling-bearing sealing device includes: an outer ring fixed to a rotating sprocket housing; an inner ring fixed to a non-rotating motor housing; a plurality of rolling elements between the outer and the inner rings; a retainer holding the rolling elements; and an oil seal including a slinger and a seal lip and fixed to the inner ring, in which a radial lip of the oil seal is pressed against the outer ring or the sprocket housing, and in which the sprocket housing has an end face provided with a side plate fixed thereto, for sliding contact by a side lip extended axially from the oil seal.

First claim

The invention claimed is:

1. A rolling-bearing sealing device comprising:
an outer ring fixed to a rotating sprocket housing;
an inner ring fixed to a non-rotating motor housing;
a plurality of rolling elements between the outer and the inner rings;
a retainer holding the rolling elements; and
an oil seal including a slinger and a seal lip and fixed to the inner ring;
wherein the seal lip of the oil seal is pressed against the outer ring or the sprocket housing for sealing a bearing space between the outer and the inner rings,
wherein the seal lip includes a side lip extended axially from the oil seal, and
wherein the sprocket housing has an end face provided with a side plate fixed thereto, for sliding contact by the side lip extended axially from the oil seal.

2. The rolling-bearing sealing device according to claim 1 ,
wherein the seal lip includes a radial lip extended radially from the oil seal, and
wherein the sprocket housing has an inner diameter surface provided with a sleeve for sliding contact by the radial lip extended radially from the oil seal.

3. The rolling-bearing sealing device according to claim 1 , wherein the inner ring has an axial end portion formed with a step, and the step forms a labyrinth seal between itself and an inner diameter end of the side plate.

4. The rolling-bearing sealing device according to claim 1 , wherein the side plate has a surface provided with a resin sliding member bonded thereto for contact between the inner ring and the side plate.

5. The rolling-bearing sealing device according to claim 1 , wherein the side plate is bolted to the end face of the sprocket housing.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Suzuki Takayuki
• Miyazaki Hiroyuki

Classifications

• F16C33/7879

  with a further sealing ring · CPC title

• F16C2350/26

  Excavators · CPC title

• F16C33/7896

  with two or more discrete sealings arranged in series · CPC title

• F16C33/805

  in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips · CPC title

• F16C33/7813

  for tapered roller bearings · CPC title