Products for Steel Production Equipment

Oil Seal

For Steel Production Equipment

CAT. NO. B1020E

Oil Seal Lineup for Steel Production Equipment

Only One Partner

Steel production equipment operates in high-temperature environments where a large amount of water is used.
In order to secure the stable operation of steel production equipment, JTEKT produces optimal oil seals that contribute to ensuring a favorable working
environment where the equipment demonstrate its true potential.
We offer a complete range of sealing technology services, including oil seals and surrounding structures such as bearings, drive shafts and other key components.

Continuous Casting Machines

Sintering Machine Pallet Cars
Wheel

Rolling Mill

Pallet car

Sprocketwheel
RailOil seals forsplit bearing unitsWheel

Intermediate seal

Converter Furnaces

End side

Large seal (MS)ME typeRoll side

MD typeGK type

Scale seal(WR)Scale seal(WR-J)

Oil seal(YSN)

Oil seal(YS)

Mogoil seal(MS-NJ)

Steel strip in coilC

Cold strip mills

Pallet car

Electric furnace

Oil seal(HMSH-J)

Hot finishing rolling millStainless steel in coil
Magnetic steel in coil

Iron oreSlabSintering machine
Continuous casting machines

Limestone

Shaped-steel rolling millPlatePlate mills

Converter

Coke ovenBloomCoal

Rod / Wire Rod mills

Shaped steel

RodBlast furnace

Billet1

Wire rod2

Oil Seals for Rolling Mill Roll Necks
Examples of Oil Seal Applications
Features of Each Oil Seal

Rolling Mill Work Rolls

Cold Rolling Mill Backup Rolls■Sealed type four -row tapered roller bearings●●●

Scale seal(WR)

The WR seal is often used as ascale seal owing to it featuring aside lip that gives it superior
ability to shake off rolling water.

Water seal(XMHE)Oil seals are attached back-to-backand play an important role inpreventing bearing oil leaks.

Oil seal(YS)

Holds grease in the bearing and prevents the infiltration ofrolling water and scale from outside.

Oil Seal (YS) Features
Features

Scale Seal

Category

WRTypeWR-RJ + H-J

WR-J

WR-BJ

Wider driving surface when assembling seal on the choke prevents seal distortion,and steel band made of enhanced high-strength material is used
Spring cover ratio increased to prevent spring from coming off when inserting into rollShape●●●Comprised of scale seal and oil seal.
Both oil seals installed facing towards the roll toprevent the infiltration of rolling water.

Oil seal(YS)●Scale seal(WR)Features

Standard scale seal product●Side lip has superior ability toprevent rolling water/scale
infiltration●

Used when there is frequent movementin the axial direction●●

Scale cover (H-J) is used if rolling water
come in direct contact with the seal

Low torque specifications●

Appropriate for high-speed coldrolling, dry milling and otherspecifications where heatgeneration and lubrication are
difficult●Driving surface
width

Wide driving surface

Used if there is no space toinstall in the radial direction
Tightened and secured with asteel band

Spring cover ratio increased

YS typeYS

Type

High-speed Cold Rolling Mill Backup Rolls

Shaped-steel Rolling Mill●

●Features

If the roll rotation speed exceeds
1,800min-1 , the durability of thescale seal is improved thanks to its
low heat generation specification.

Outer scale seal
(WR-J)●

Intermediate scale seal(WR-J)

Infiltration of rolling water is preventedby using two scale seals.
Oil seals for low-heat generating
specifications.

A HMSH-J oil seal with scaleseal function added is used on
the roll side to prevent theinfiltration of scale.

YS-JYS-P

YSN

Scale Seal (WR & WR-J) Features●Oil seal(HMSH-J)
Oil seal(HMSH)

Standard oil seal product
Superior installation ability
owing to use of robust steel band●

YS oil seal with an additional
auxiliary lip to prevent the
infiltration of dust

Spring less likely to come out asrubber covers more than 75% ofthe bearing●YS oil seal with scale seal
modification added for whenthere is insufficient space toinstall a scale seal●

●YS with pressure-resistantspecification
Additional backup ring on the lip
prevents lip from turning due topressure, reduces lip temperatureby providing support

Oil Seal

Category

MSTypeOil seal(YSN)

YSAShape●●HMS typeOil Seal

Category

MSA

HMSH

HMSH-J●

Often used for low-torque YS
specifications but can be usedwith general specifications

Water Seal

V ring

XMHE

MV-A(Low-torque products)(Standard products)

Used in locations exposed to large volumes of water,such as hot rolling mills, owing to superior ability toprevent water and scale infiltration

Used for high-speed cold rolling owing to the ability
to suppress rising lip temperature

Shape●Features●

Easy-to-install oil seal
comprised of rubber andhook-type spring●

MS oil seal with an auxiliary
lip added to prevent theinfiltration of dust●

Small-diameter oil seal(outer diameter 300mm orless)●If shaft cannot be removed,
a one cut-type oil seal
(MS-C) is used

HMSH oil seal with scaleseal modification added forwhen there is insufficientspace to install a scale seal

●Seal lip is installed facing
outward, with the two spaces
functioning as a conduit to directrolling water from the top to thebottom and prevent infiltrationof rolling water and scale

●

●(WR)

A seal made of only rubber
stretched and attached tothe shaft
Used as an alternative to ascale seal

Lip temperature on actual machine measured and reflected in designStandard product(large interference margin)

200

Hot Rolling Mill Backup Rolls

Mogoil Bearing (Slide Bearing)

MS-J

Type●

●

The WR-RJ scale seal with aradial lip for superior followingof axial displacement and theH-J scale cover can also be used.
Two oil seals installed facing
towards the roll play an importantpart in preventing water infiltration.

3

Scale seal(WR-RJ)●Scale cover(H-J)
Water seal(XMHE)Oil seal(YS)●Scale seal(WR)Scale seal is combined with aseal inner ring to make theinfiltration path complex andshake off rolling water.

Block Mill Seal
MS-NJ

M-BNJ

WR-J

Shape

Lip temperature (℃)

Mogoil Seal

Category(WR-J)

Standard product(small interference margin)100

Low-torque product(large interference margin)
Low-torque product(small interference margin)

Seal inner ringIn addition to the ability toshake off water, the Mogoil seal
increases sealability using aseal lip.

●●

Mogoil seal(MS-NJ)

4Features●Standard Mogoil seal productEast-to-install seal that prevents theinfiltration of oil and water
Rotates due to being secured to the rollneck, and therefore has superior shake offperformance●

Lip contact is stable owing to the different
shapes of the lip and end-plate, thereby
achieving superior sealability performancecompared to the MS-J5●●

Standard block mill seal product●Prevents infiltration of oil and water at
ultrahigh-speed rotation of 100 m/s●Improved product durability with superior
detachability
Uses two seals, one each for oil and water,
for tough specification conditions, with seal
on water side only easy to replace00

10203040Velocity (m/s)

Velocity and lip temperature (bench test)

650

Oil Seals for Continuous Casting Machines
Types of Rolls
Roll configuration example 1 (single and split rolls)

Roll configuration example 2 (pestle-shaped roll)

Optimal configuration for roll elongation absorption using single and split rolls

Optimal configuration for roll elongation absorption using pestle-shaped roll【 bearing for free side 】【 bearing for free side 】【 bearing for fixed side 】【 bearing for free side 】【 bearing for fixed side 】

Oil Seals for Split Bearing Units
Follow roll deflection
Suppress water and scale infiltration
Hold grease between lips

Features(See next page for oil seal for split bearing units)

Grease discharge method

Oil Seals for Free Side/Fixed Side Bearing Housing Units
Features

Bumper lip shape for main lip alleviates shaft wear

OutsideBearingsideProtective lip suppresses water/scale infiltration

Hydrogenated nitrile rubber (HNBR) used as standard rubber material,featuring superior heat resistance that ensures more stable use when exposed to water vapor

Compact sealing structure

Labyrinth ring

RollerGrease Recovery Method■ Discharge and recovery methods for bearing house grease and oil/airPacking

End side

Inner ring

Roll side

OutsideME typeMD typeGK typeStandard end-side productImproved sealability withprotective lip

Vent for improved lubrication andsuppressing wear on shaft and lipDischarge method◯◯ー

Recovery method◯ー◯Discharge method◯◯ーRecovery method◯◯ーBearingside

SealShape

Characteristic
GreaseOil/Air

Please consult with JTEKT regarding oil seals
for oil/air lubrication.

Oil Seal Rubber Material Used for Continuous Casting Machines
Features

Bearing Housing Grease discharge method
Oil/Air discharge method
Oil/Air recovery method

Bearing Housing Grease recovery method■ Rubber material resistance comparison
End side

End side

Roll side

Roll side

ME typeME typeGK typeMD type

SpringProtective lip

Vent
Protective lip

Auxiliary lipBumper lip

Main lip

Main lip

Bumper lip

Auxiliary lip

7

Bumper lip

Hydrogenated nitrile rubber(HNBR)

Fluoro rubber(FKM)

Nitrile butadiene rubber(NBR)

Heat resistance◯◯△Urea grease resistance◯△◯

Water vapor resistance◯×△

Water resistance◯◯◯

Wear resistance◯◯◯SpringSpringSpringMain lip

Compared to fluoro rubber (FKM), hydrogenated nitrile rubber (HNBR) has superior water vapor resistance andgrease resistance (urea-based), thereby providing better performance than FKM in cases of continuous use.

◯：Has resistance (excluding specific cases) △：No resistance (excluding specific cases) ×：No resistance

Note: Judgment of heat resistance and water vapor resistance assumed a working condition of 100℃

Main lip
Auxiliary lip

Bumper lip

8Oil Seals for Sintering Machine Pallet Cars

Intermediate Seal

Intermediate sealFeatures

Technology Management
1

Basic design concept2

No damage to peripheral parts owing to
two-component ( 1 and 2 ) combined structure①②③

Prevents dust infiltration owing to high sealing
performance provided by multilayer lip structure
Pressure roller

WheelOptimal rubber composition as sealing material
Well-balanced design adaptable to location of use① Scale seal
…Prevents infiltration of/shakes offAnalysis
examplecooling water② Water seal
…Prevents infiltration of cooling water③ Oil seal
…Prevents leakage of bearing lubricant

Sealed Bearing Seals
Bearing seal for pressure rollers●●

Scale seal FEM analysis

Oil seal FEM analysis

Material
DesignAnalysis

Bearing seals for wheels

Special seal shape with integrated
sleeve prevents dust infiltration●●

Compact seal shape with improved
sealing performance prevents dustinfiltration

Example rolling bearing sealers
for backup rolls

TechnologyManagementProduction
Inspection

Oil Seals for Converter Furnaces

Evaluation

Stable quality by vacuum vulcanization molding
Integrated production of seals including rubber and metal ring

Large Seals
Features

Evaluation can be performed in asimulated environment closely
resembling actual machine operation

MS-type oil seals can be cut in one location to enable easy installation
on long or complex-shaped shafts

Large turning machine

Converter trunnion split bearing

MS-type oil seal cut in one location
Bearing tester
for steel production equipment

910Inspection data CPU

Oil Seal For Steel Production Equipment
www.jtekt.co.jp

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CAT. NO. B1020E

Printed in Japan 17.05 -1CCH