Product Details Supplier Info More products

Schaeffler’s new range of FAG wheel bearings is compact and light and offers mounting via a self-centring, axial spur gear teeth design.

This latest design of wheel bearing is not only 10 per cent lighter than previous versions but it is also more compact, more precise and provides simplified mounting.

The range of FAG wheel bearings, which was first developed as a concept in 2004, has now moved into series production, with BMW already utilising the wheel bearings on its new X1 model.

A reduction in weight of 10 per cent typically amounts to an overall weight reduction of around 1kg for a four-wheel vehicle.

The FAG wheel bearing has a spur gear teeth design, in which the wheel bearing and axle journal are connected axially rather than radially.

This has resulted in a bearing module that can be mounted clearance free.

As a result, driving characteristics are improved and automotive manufacturers benefit from a simple mounting process and the associated cost reductions.

Previously, the gear teeth of the axle journal of the input shaft were pushed axially into the wheel bearing.

Here, the drive torque was transferred via longitudinal gear teeth.

This mounting method is said to have a number of disadvantages.

The relatively solid, heavy component requires a certain amount of clearance to facilitate mounting.

Loads that occur during vehicle operation can result in the assembly becoming loose, leading to loss of comfort and higher noise levels, as well as the possible failure of the bearing.

Up to now, the solution has been to reduce the radial clearance to zero in the design phase.

However, this requires the use of complex, costly mounting technology.

The new FAG wheel bearing with spur gear teeth is better equipped to deal with the loads that occur during vehicle operation, according to the company.

The spur gear teeth ensure positive connection between the wheel bearing carrier and the input shaft, simplifying mounting.

The self-centring axial gear teeth are placed on the axle journal and are fixed in place using a central screw.

Unlike radial gear teeth, this mounting procedure does not require significant force.

The bearing remains clearance free but securely held in place during vehicle operation.

Having four lighter wheel bearings on the vehicle reduces the unsprung masses, thus improving the driving characteristics and contributing to a reduction in CO2 emissions.

Schaeffler claims that, although the idea of using spur gear teeth in wheel bearings is not totally new, manufacturing these in an economical way is.

The economical production of the FAG wheel bearing was made possible by the use of an orbitally formed shoulder as the carrier of the gear teeth.

The spur gear teeth are applied onto the orbitally formed shoulder by high-precision cold forming.

The company has developed a solution for the manufacture of this complex component that enables volume production.

Schaeffler expects this to replace conventional radial gear teeth.

View full profile