Tapered Roller Bearings
for axle drive pinions

CAT.NO.B1006E -1

Tapered roller bearings for axle drive pinions
Drive pinion bearings support the drive pinion gear shaft of the hypoid gear,
which facilitates a 90° directional change of the driving force transmitted from the propeller shaft.
This bearing is used in pairs to simultaneously ensure smooth rotation and the rigidity of gear meshing points.

Compact & Lightweight, Low-torque,

High-capacity & High-durability. JTEKT’s TRBs support
enhancement of vehicle’s environmental performance.

Drive pinion gear

In automobile axles, various stresses are caused by acceleration, deceleration, and cornering forces in
a complex manner from all directions.
They're truly a key mechanical part of every vehicle. In response to the demand for ever more advanced
bearings that support drive pinions, JTEKT goes one step beyond making proposals. Every elemental
technology imaginable is rethought from scratch to ensure products with unequalled levels of low friction loss and high capacity.

Head-side bearing
Tail-side bearing
Propeller shaft

Tapered roller bearing development timeline (for automobile drivelines)
1960

1970
Enhanced reliability

Bearing trends and needs

Lower torqueLow torqueWorld

1stLFT-I bearing :2010

2020

Responding to needs for more compact size and lower torque
10% lower torque
LFT-II bearing: 20% lower torque●Special raceway● Optimized internal design
crowning● Reduced lubricant churning resistance● Size reduction by adopting KE or KEⅡ
heat treatment

World

1stLFT-III bearing: 80% lower torque(compared to HC bearings)

1st KEⅡ bearings: 15-fold longer service life

(compared to HC bearings)

World

1stWorld

1st HC bearing became a standard for TRB●Near net shape cold-forging■Patent No. 2733608

High surface hardness● Optimization of amount of retained austenite●KE bearings

HC bearing

1980

1990

■Patent No. 4217818

50
10110

●

KEbearings KEⅡHCbearings
bearings
100

High-concentration carburizing technology

・High surface hardness
・Fine carbide
・Finer steel structure

1000

Service life (hr)Koyo EXTRA LIFE Bearing

High Capacity Bearing1970

KE bearings:
10-fold longer service life

Cumulative failure
probability (%)

Longer service life
with contaminated oilWorld

1960

012000Enhanced seizure resistanceSpecial processing of inner ring rib surface

Low Friction Torque Bearing

1990※ LFT is the abbreviation for low-friction torque, and is a registered trademark of JTEKT Corporation.

Compact / Lightweight

Development initiatives

●1980

2000

2010

2020

02

Tapered Roller Bearings

Tapered Roller Bearings Torque reduction technologies LFT
To reduce bearing rotational torque by focusing on friction loss caused by sliding, rolling
and lubricant churning.

Target2

Signiﬁcant extension of service life with contaminated oil by adopting JTEKT’s own
heat treatment technologies.

1．Increase bearing surface hardnessEffective to surface originated ﬂaking
which occurs when lubricatedby contaminated oil

2．Optimize the amount of retained austenite

3Flaking Initiated from Surface

Flaking Initated
From Sub - Surface

100② Optimized raceway crowning proﬁleRolling
Element

Abrasive wearby small,hard particles

Abrasive wear by small,
hard particles andplastic deformation
by large hard particles

Plastic deformation
caused by outside force
or large andhard particles⑤ Control of lubricating oil ﬂow

Material defectat maximum
shear stress depth

KE Bearing

Performance55%
reduction 80%
reduction40％0％

Standard TRB

LFT-Ⅱ

Recommended

LFT-Ⅲ

Cumulative failure probability (%)

100％

60％

66

◎ Reduced Plastic Deformation

Residual austenite optimized◎ Early elimination of Plastic Deformation

Optimized matrix C%

54

Longer service life withcontaminated oil

321

Optimized surface
hardnessof rolling element

00102030

4050

Retained austenite γR (%)“Recommended” models signiﬁcantly contribute to torque reduction compared tostandard TRBs.

20％

Size/
Weight reductions

Contribution to fueleconomy enhancement

10-fold longer

service lifewith
contaminated oil50Equivalent service life
Approx. 25% lighter

10Standard bearing
1003◎ Improved Wear Resistance

Increased Surface
Hardness forCounter measures④ Size reduction enabled by excellent
heat-treatment technologies

80％64■Relationship between the amount of retained
austenite and Weibull slope with contaminated oil③ Optimized internal design

For axle drive pinion application, we are pleased topropose a model specially designed for that purpose
as a recommended model. In addition, we can offer
LFT-Ⅲ as its option since LFT-Ⅲ has a premium
speciﬁcation including the control of lubricating oil
ﬂow.

62

Foreign matter hardness at time of testing
Surface hardness (HRC)

LFT-Ⅲ① Optimized surface roughness and shapeof sliding parts

Performance

50
060

Mechanism

Recommended

Flaking from Dent

Appearance

4LFT-Ⅱ

Mixed Flaking

150

Service life (hr)ModesFlaking in Contaminated Oil

Peeling

Applied technologies

200

Flaking in Clean Oil

15■Relationship between bearing surface
hardness and service life with contaminated oil

Bearing ﬂaking mode

Weibull slope

Target

KE Bearing−Embodiment of Size/Weight Reduction Technologies

KE bearing
100

Service life (hr)1000Standard bearingΦ 40 ×Φ 80 ×19.75

KE bearingΦ 40 ×Φ 68 ×1904

Example Technology Review

Example Evaluation
CAE analysis result is veriﬁed by using an actual ﬁnal reduction gear unit
with an actual drive pinion.

■CAE analysis
JTEKT’s design and development are conducted utilizing the latest
equipment in an advanced CAE environment.
As JTEKT developed its own high-precision tapered roller bearing’s torque calculation formula based on accumulated data, research and analysis, rotational torquecan be easily obtained and used for examination.
JTEKT considers the rigidity of whole axle system, which supports the axle,
bearing service life, contact stress, etc. and propose the best TRBs for yourapplications.

Pinion gear

3D model of axle systemzy

Torquemotor

Pinion gear
drive motor■Deﬂection of pinion gear’s meshing point
0.3

Tail

2.67E+003

Test bearings

0.2
Deﬂection (mm)Pinion bearing service life
Head

Differentialcarrierx

Calculation is possible as axle system.
■Service life calculation

Ring gear
drive motor

1.27EE+003

0.00E+000 5.00E+002 1.00E+003 1.50E+003 2.00E+003 2.50E+003 3.00E+003 3.50E+003 4.00E+003
Life (hours)

0.0-0.1

0-0.2■Surface pressure calculation

Ring gearNo engagement of pinion gearwith ring gear

0.1-0.3

20X DEF.

4060

Y DEF.

80

100

Z DEF.

Schematic diagram of test equipment

120■Pinion bearing torque measurement results■Oil temperature measurement results of differential gears

CONTACT STRESS (MPa)3000.03000.02000.01000.00.0

2000.0Recommended▶Max.55% torque reduction

Recommended▶Max. temp. rise controlled to 11°C

LFT-Ⅲ

▶Max.80%torque reduction

LFT-Ⅲ▶Max. temp. rise controlled to 20°C

1000.0-9.70※ Compared to Standard TRB※ Compared to LFT-II

9.70

Maximum Contact Stress:2713.6 MPa■Simulation test equipment
In response to customers’ requests, we conduct evaluations utilizing various vehicle driving conditions.
At JTEKT, prior to evaluations in actual vehicles, evaluations simulating
various driving conditions are possible (such as oil ﬂow check and torqueloss measurement), which enables the reduction of development and evaluation periods.

0Standard TRB

LFT-ⅡRecommendedLFT-Ⅲ

2000

4000

Recommended

LFT-Ⅱ

LFT-Ⅲ

Differential gears oil temp. (°C)

0.30

Torque loss of pinion (N·m)

-0.30

6000

Rotational speed of pinion (r/min)

8000

02000

4000

6000

8000

Rotational speed of pinion (r/min)

Simulation of mountain road driving, high-speed cornering, driving in urban areas, etc.
Nose angle

Turning angle

Rotational speed

05

Temp

Longitudinal G force

Lateral G force

LoadTesting methods:“Pinion bearing torque measurement results” for torque reduction and“Oil temperature measurement results of differential gears”for temperature rise.

06

Global Technical Support (Bearing Development Bases)
Technical centers located around the world ensure quick response and technical support
for customers' needs.

Recommended Series Bearing Numbers
Please select from the recommended bearing numbers when considering axle drive pinion bearings.
Basic load Fatigue
ratingload limit
(kN)
(kN)

Boundary dimensions
(mm)

No.
1

Europe (5 bases)

America (2 bases)

TB

CCr

30

72

20.750

1914

C0r

Cuae

Axial
load factor

Y1Y0(Reference)
Mass(kg)

71.2 55.6

8.10

KEST3072CLFT---18.6

0.55

1.10 0.60

0.381

33.338 68.263 22.225 22.225 15.25 66.1 62.2

8.70

KESTD3368LFT

M88048/10

21.8

0.70

0.86 0.47

0.361

334.925 72.233 23.579 23.106 15.463 78.8 75.0

10.6

KESTR3572LFTYR1

HM88649/10

22.0

0.70

0.86 0.47

0.428

56

29.00027.2

20

100 96.4

13.8

KESTN3580LFT

---

24.8

0.50

1.20 0.66

0.694

36.513 79.375 29.370

3527.2

20.4

100 96.4

13.8

KESTA3779LFT

HM89249/10

25.6

0.67

0.90 0.49

0.664

2618.5110 106

15.7

KESTJ4090LFT---

25.40.620.97 0.53

0.80640809026.500

741.275 82.550 26.543 25.654

1885.8 75.3

11.0

KEST4183YR1LFT

M802048/11

27.3

0.72

0.84 0.46

0.601

841.275 90.000 30.006 30.006

21112 112

16.2

KEST4190LFTUR4HM803146/10

29.0

0.70

0.86 0.47

0.866

KETRD091004UR4---34.5

0.76

0.79 0.43

1.469

China / Southeast Asia (2 bases)

Dbearing number

Load center
position
Constant(mm)24Japan (4 bases)

dABMA
bearing
number45100

38.00036.5

27.5

164 183

25.6

10 47.625 95.250 30.162

29.3720.5127 133

19.4

KESTA4895-1LFTUR4 HM804846/10

29.2

0.70

0.86 0.47

0.945

11 50.800 104.775 36.512

3425.5171 177

26.1

KETRD101004UR4

33.1

0.67

0.90 0.49

1.41

HM807046/10

Boundary dimensions can be changed upon request.
For details, please contact the nearest JTEKT sales ofﬁce.

Iga Proving Ground Enables Testing / Evaluations Simulating Roads Worldwide
Fully utilizing our knowledge as a world-leading systems supplier, JTEKT conducts driving evaluations and analyses of products installedin vehicles. We exhaustively pursue the highest standards in product safety and operation on a test course capable of simulating various
road and weather conditions around the world. As a total systems supplier, our highest value is to provide our customers with productsthat deliver outstanding performance and the best quality that help to make automobiles that are more than just fun to drive.

A Straight-line Course

These dimensions
can be changed.

B Winding Course■ JTEKT Iga Proving Ground・Site area: 500,000m2
・Course area: 170,000m2
・Combined circuit length: 2,200m
・Dynamics pad area: 54,000m2
BE

D

D Fording Course07

E Dynamics Pad

ACF

F Noise Evaluation Course

C Administration / Maintenance Building08www.jtekt.co.jp
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CAT.NO.B1006E -1

Printed in Japan'15.08-12BCH(14.04)