Wheel Bearings
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Copyright ©
Schaeffler Automotive Aftermarket GmbH & Co. KG
April 2012
Contents
Page
FAG Automotive: Quality of an original supplier for the aftermarket
4
Product Range
5
FAG WheelSet Tapered Roller Bearings
6
FAG WheelSet 1st Generation
7
FAG WheelSet 1T Generation
8
FAG WheelSet 2nd Generation
9
FAG WheelSet 3rd Generation
10
FAG WheelSet with Axial Splines
11
Wheel bearing with integrated ABS pulse generator ring
12
3
FAG Automotive
Quality of an original supplier for the aftermarket
FAG is an original equipment supplier for passenger cars
by:
Audi, Volvo, BMW, VW, Ford, DC, GM, Fiat, Daewoo,
Honda, Hyundai, Isuzu, Mazda, Mitsubishi, Porsche,
Proton, Renault, Nissan, PSA, SsangYong, Suzuki, Toyota.
FAG is an original equipment supplier for commercial
vehicles, trailers and axles by:
Volvo, SAF, DAF, RVI, Mercedes-Benz, Arvin Meritor,
Iveco, MAN, Scania, BPW.
What is considered standard in the automotive industry
today is the result of continuous further development toward
high-technology products. The vehicle of the future, however,
is supposed not only to be faster but also more economical.
Irrespective of the high loads that individual parts are
subjected to, they must also provide advanced resistance to
wear. This is why all renowned automobile manufacturers
strive for innovation and enhanced efficiency. FAG meets
all of the requirements placed by the market. It designs,
manufactures and supplies customer-oriented automotive
components.
FAG wheel bearings and FAG bearings for transmission shafts
for both passenger cars and commercial vehicles are soughtafter for their particular safety and reliability characteristics.
A global network of production sites and sales centers ensure
that FAG is always close to the markets and its customers.
When developing customer-specified bearings, FAG does not
only search for technical innovations, but aims at ensuring a
perfect interplay of all components in the vehicle.
A new product is only able to succeed on the market it it
integrates additional functions such as an ABS sensor.
4
FAG contributes to the success of its customers by designing
products that excel in quality, durability and reliability.
Our weightiest example:
The new high-end model from DaimlerChrysler, the
Maybach, runs with FAG wheel bearings on both the front
and the rear axles. FAG wheel bearing modules will ensure
that our world stays in motion.
• Optimal quality assurance standards during design and
later use
• Innovative calculation methods and safety tests on FAG
wheel bearing testing stands
• Easy-to-install and maintenance-free wheel bearings
with significantly increased service life
• Knowledge of the industry and close cooperation
between the developing engineers and the customer
• Pre-tested system solutions are available as ready-foruse applications
• Comprehensive service range is complemented by
aftermarket applications from INA and LuK
Product Range
Standard Bearing
Tapered Roller Bearing
1T Generation
Tapered Roller Bearing
(double-row)
3E/Ew* Generation
Angular Contact
Ball Bearing (double-row)
1st
Generation
Angular Contact
Ball Bearing (double-row)
2.1 Generation
Angular Contact
Ball Bearing (double-row)
3Ew* Generation
Angular Contact
Ball Bearing (double-row)
with Axial Splines
3.2/3.2w* Generation
Angular Contact
Ball Bearing (double-row)
with ABS Encoder
5
FAG WheelSet
Tapered Roller Bearings
Bearings in general
Bearings perform the task of guiding and supporting shafts
and axles with the least possible friction and wear. Bearings
can be put under load in radial and/or axial direction. Rolling
bearings can be designed to the requirements of any load.
FAG WheelSet Tapered Roller Bearings
Tapered Roller Bearings
Tapered roller bearings can be dismantled, inner and outer
rings can be separately installed. As tapered roller bearings
can only support axial loads from one direction, a second
tapered roller bearing must be inversely fitted to counter
the load. Compared to angular contact ball bearings, which
have similar characteristics, tapered roller bearings provide
a higher load-carrying capacity but therefore have a limited
speed range.
FAG – the roller bearings specialist with system know-how
FAG Automotive Technology develops and manufactures
customized application-oriented automotive components,
matching the technological and economic requirements for all
applications in the vehicle.
Advantages:
• For rear wheels with drum brakes
• Advanced load-bearing capacity
• Space-saving design
Outer Ring
Inner Ring
Rolling Body
Cage
6
Including for example:
• Two tapered roller bearings, can be dismantled,
inversely fitted
• Snap ring for nut and splint
• Splint
• Shaft sealing ring
• Grease cap
• Rolling bearing grease
FAG WheelSet 1st Generation
Angular Contact Ball Bearing
Wheel bearings of the 1st Generation are compact bearing
units, manufactured by FAG with a defined and preset
bearing clearance, for-life lubrication (no maintenance)
and sealing.
FAG WheelSet 1st Generation
FAG has designed angular contact ball bearings for both
the front and rear axles of passenger cars which support
and bear high lateral forces during driving on round
bends.
Advantages:
• Defined and preset bearing clearance
• For-life lubrication
• Sealing
• For front and rear wheels
Including for example:
• Compact bearing unit with a double row
angular contact ball bearing
• Screw with hexagon socket
• 2 self-locking nuts
• 2 nuts with locking paint
7
FAG WheelSet 1T Generation
(T = Tapered Bearing)
FAG WheelSet 1T Generation
Similar to wheel bearings of the 1st Generation, wheel
bearings of the 1T Generation are compact bearing units.
However, instead of balls they use tapered rollers as
rolling bodies.
Using tapered rollers increases the bearing’s capacity to
support high axle loads and lateral acceleration.
With the help of the FE calculation method and taking into
consideration the surrounding design, a for-life lubricated
tapered roller bearing unit (maintenance-free) with a
defined bearing preload was designed.
Including for example:
• One 1T Generation wheel bearing
• Compact bearing unit with double-row
tapered roller bearings inversely fitted
• Snap ring
• Nut
8
FAG WheelSet 2nd Generation
Angular Contact Ball Bearing
FAG WheelSet 2nd Generation
Wheel bearings of the 2nd generation are compact bearing
units, manufactured by FAG with a defined and preset
bearing clearance, for-life lubrication (no maintenance)
and sealing.
They combine the value for money of the 1st Generation
with the advantages of an integrated wheel flange for
attaching the brake disc and wheel rim.
The wheel bearing unit is secured on the wheel mount
with an innovative snap ring that also provides for the
axial tension on the bearing outer ring.
Including for example:
• Compact bearing unit with double-row
angular contact bearing
• Nut
Advantages:
• Defined and preset bearing clearance
• Integration of the wheel flange
• Innovative snap ring ensuring axial tension on the
bearing outer ring and attachment of the bearing to the
wheel mount
• Flange with internal gearing for the driven wheels
• Orbitally formed unit, completely pre-adjusted
• Possible integration of a multipole encoder in the
rubber seal, supporting ABS, ASR and ESP
9
FAG WheelSet 3rd Generation
Angular Contact Ball Bearing
Wheel bearings of the 3rd Generation are highly
integrated units with a mounting flange for the brake disc,
wheel and wheel mount that guarantee highest running
accuracy. Integrated speed encoders provide the required
signal for ABS/ESP suspension control. The bearing
clamping force is applied and controlled by FAG via an
orbitally formed shoulder.
FAG WheelSet 3rd Generation
Reduced total cost of mounting because of the doubleflange design. Consequently, reductions in function,
comfort and overall bearing life caused by mounting
influences are finally a thing of the past.
Advantages:
• Integrated wheel speed sensor controls ABS, ASR
and ESPPlus
• For-life lubrication and sealing
• High-precision brake disc and wheel guidance
• Reduced installation complexity through
double-flange design
• Bearing clamping force is applied in a controlled
manner via the orbitally formed shoulder
10
Including for example:
• Compact bearing unit with a double-row
angular contact ball bearing
• 1 self-locking nut
• 3 screws for fitting to wheel mount
• 1 grease cap
FAG WheelSet
with Axial Splines
In conventional systems, the drive torque is transferred
between the wheel bearing and the axle journal by
means of radial splines, which have a certain amount
of clearance. Loads that occur in day-to-day driving
conditions mean that there is a risk that the assembly
constantly loosens way beyond the normal mounting
clearance, resulting in everything from reduction in
comfort and unpleasant noises right up to the failure
of the bearing.
FAG WheelSet with Axial Splines
However, the new FAG wheel bearing module with axial
splines is appealing due to simple mounting methods.
The self-centering axial gear teeth are placed on the axle
journal and fixed in placed by means of the central
screw in the assembly. The bearing remains completely
clearance-free in the gear teeth during operation.
Advantages:
• 10% weight reduction in comparison with conventional
wheel bearings, in total more than a kilogram overall
for all four wheels on the vehicle
• Reduction in fuel consumption
• Reduction in damaging CO2 emissions
• Easier installation in the driving shaft
• Considerably simplified mounting procedures
• Free-of-play bearing operation for the entire life of
the part
• 50% more torque transmission compared with radial
splines due to the larger diameter of the pitch circle
of the gear teeth.
Including for example:
• Consolidated wheel bearing module
• Central screw
• 4 screws for fitting to wheel mount
11
Wheel bearing with
integrated ABS pulse generator ring
There is a recent trend in the automotive industry for
the increased use of wheel bearings designed with
a magnetic ABS pulse generator ring. This applies to
double-row cylindrical wheel bearings with preset
clearances as well as wheel hubs with integrated
bearings. The magnetic pulse generator ring takes over
the function of the ABS sensor ring, normally mounted on
the wheel hub or drive shaft joint.
Fig. 1: Wheel hub with ABS sensor bearing (left) and
conventional ABS sensor ring (right)
In double-row cylindrical wheel bearings, the magnetic
ring is an integral part of the radial seal. The magnetic
ring may however be fitted on the outside of wheel
hubs with integrated bearings. The pulse generator
ring is made of a ferromagnetic sintered material with
alternating polarity.
S
Fig. 2: ABS sensor pulse
generator ring
Fig. 3: Signal curve for
inductive pickup signal
The signals are processed using an inductive pickup
(two-pole) or a ‚Hall generator‘ (three-pole). In either
12
Note
When replacing a double-row cylindrical wheel
bearing with pulse generator ring integrated in
the radial seal it is critical to mount the bearing in
the right direction. Failure to do so can impair the
functioning of dynamic drive control systems such as
ABS, ESP etc.
Always observe the fitting instructions included in
the packaging of the respective wheel bearing units.
If unsure, use the FAG detector card to determine
the correct mounting direction of the bearing.
The detector card will help you to identify the
pulse generator ring integrated in the bearing and
consequently to determine the correct mounting
direction.
S N S
N
N S
N
case, a signal is generated showing a frequency which is
proportional to the wheel speed. This serves as an input
signal for the ABS/ESP/ASR control units.
Fig. 4: Use of a detector card, here with an FAG
sensor bearing with pulse generator ring recognition
(right)
Furthermore, no test voltage must be applied to
the connector of the pulse generator, as this could
damage its electronics.
2x1 or 1x2 – Always on the safe side!
Our safety formula for changing wheel bearings
The advantages of changing both wheel bearings at once
are obvious – greater passenger and driver safety and
less wear on the vehicle.
FAG delivers tried-and-tested quality and expertise. The
FAG WheelPro is a service innovation for the repair market
and reinforces FAG’s role as a pioneer among OE suppliers.
Choose between two safe options:
• 1x WheelPro twin pack
• 2x WheelSets – 2 individual replacement wheel bearing
units
With its innovative concept for a per-axle wheel bearing
replacement set, FAG – as one of the leading wheel
bearing manufacturers – offers a new high-grade, madeto-measure solution for a large number of vehicle models:
• Money-saving twin pack
• FAG range (OE and aftermarket) covers a wide range
of vehicles
• Time-saving per-axle wheel bearing change
• Enhanced customer satisfaction through innovative
FAG WheelPro concept
With the twin-pack wheel bearing replacement set you
will be on the road to success – in the salesroom, in the
workshop and with customers.
2x FAG WheelSet = twice as safe!
+
=
Whatever you choose – twin pack or two single packs –
with FAG wheel bearing sets and per-axle replacement
you have the advantage of:
• More safety through simultaneous wheel bearing
change on both sides of the axle
• More customer satisfaction with FAG’s OEM quality
• More customer loyalty due to better customer
satisfaction
• More return customers
Double the benefits!
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Notes
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Phone: +49 (0) 1801 753-333
Fax: +49 (0) 6103 753-297
Email: FAG-AS@Schaeffler.com
www.Schaeffler-Aftermarket.com
999
9996001
600100
002285/50.0/6.2010/PZ-M
2285/50.0/6.2010/PZ-M
© 2012 Schaeffler Automotive Aftermarket GmbH & Co. KG