# US 9,751,576 B2 · Sealing devices for anti-friction bearing

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- Number: US 9,751,576 B2
- Document ID: US9751576B2
- Status: Granted
- Kind: B2
- Application number: 15/022,259
- Filed: 2014-09-19
- Published: 2016-08-11
- Granted: 2017-09-05
- Earliest claimed: 2013-09-20
- Assignees: Ntn Corporation
- Applicants: Ntn Corporation
- Inventors: Takayuki Suzuki; Hiroyuki Miyazaki
- Web page: https://patentgrep.com/patent/US9751576B2

## CPC

- B62D 55/088: with means to exclude or remove foreign matter, e.g. sealing means, self-cleaning track links or sprockets, deflector plates or scrapers
- F16C 33/7823: {of sealing lips}
- F16C 33/783: {of the mounting region}
- F16C 33/7873: {with a single sealing ring of generally L-shaped cross-section}
- F16C 33/7879: {with a further sealing ring}
- F16C 33/7889: {mounted to an inner race and extending toward the outer race}
- F16C 33/805: {in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips}
- F16C 43/045: {Mounting or replacing seals}
- F16J 15/164: {the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid}
- F16J 15/3256: comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
- F16C 19/364: {with tapered rollers, i.e. rollers having essentially the shape of a truncated cone}
- F16C 19/543: {in O-arrangement}
- F16C 33/7813: {for tapered roller bearings}
- F16C 33/7896: {with two or more discrete sealings arranged in series}
- F16C 2326/20: Land vehicles
- F16C 2350/26: Excavators
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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