The SLF standard portfolio comprises the 718, 719, 70, 72 and 73 series. Other series are manufactured upon request. In angular contact ball bearings with designation suffix B, the contact angle α is 40°, and in bearings without suffix, it is 20° or 30° depending on the series. Here, α is understood as the angle encompassed by the connecting line of the two points of contact between ball and raceways with the radial plane, and under which the load is transferred from one raceway to the other.

Single row angular contact ball bearings have raceways that are offset in the bearing axis direction in the inner and outer ring and carry axial forces in only one direction. In case of a radial load, an axial force emerges in the bearing, and this force must be compensated by a counterforce. Angular contact ball bearings are not used as single bearings, because they carry emerging forces together. Consequently, these bearings are always arranged in pairs or as a bearing set based on mutual matching.

Sealed wheel bearings are simply another design. This bearing is sealed inside the inner and outer bearing race and isn’t serviceable or re-packable as are serviceable wheel bearings. Sealed wheel bearings are usually found on newer cars, front-wheel-drive cars, and many other makes and models. Eventually, the grease inside sealed wheel bearings will wear down and the bearing unit will lose its lubrication. When these bearings show signs of wear (loose wheel or noise while driving) they can only be replaced. (Repair isn’t an option.)

Nsk pdf

The TOT arrangement is employed for high radial loads and at high axial loads in both directions as a fixed bearing. With this arrangement, very high stiffness is achieved. It is reasonable to install a maximum of three bearings side by side; otherwise, dissipation of heat and lubricant supply to all bearings would become worse or more difficult. To avoid this, spacers should be used here. It is possible to feed the lubricant easily through radial holes in the outer spacer. All arrangements can be delivered as a set upon request.

High-speed travel and hard turning at high speeds wears on wheel bearings excessively, sometimes causing them to fail prematurely. And overloading your vehicle or towing anything that exceeds the gross vehicle weight of your vehicle will also cause premature wear and eventual failure.

Angular contact ball bearings can also be delivered with ceramic balls or ceramic coating to insulate against electric current passage up to 1000 V. SLF’s angular contact ball bearings are also delivered as ”LONGLIFE“ bearings upon request. Bearings of this design type have a higher fatigue limit than the standard bearing. Both bearing and packaging are marked “LONGLIFE“.

Please take a few moments and watch this 2 minute instructional video about the importance of Wheel Bearings to help keep you and the family safe on the road.

NSK Spherical Roller bearing pdf

Back to back vs face to face bearing

To avoid slippage between the contact partners, the angular contact ball bearings must be sufficiently loaded. A radial minimum load in the order of magnitude of

SLF-angular contact ball bearings up to 240 mm outer diameter are standard stabilized in dimensions by S0, meaning that they are heat treated to make them usable up to a working temperature of 150 °C. At greater than 240 mm outer diameter, the angular contact ball bearings are standard stabilized in dimensions by S1, meaning that they are heat treated to make them usable up to a working temperature of 200 °C. However, as a rule, the maximum operating temperature is not limited by the dimensional stability of the bearing rings and balls. In many cases, it is limited by cage, seals or lubricant. Please find the relevant information in the corresponding chapters. If you feel uncertain or have specific questions regarding the temperature limits of our bearings, the SLF team is ready to support you.

Deep grooveballbearing

As the default, we manufacture single row angular contact ball bearings with standard tolerances (PN) according to DIN 620-2 (Roller bearing tolerances – tolerances for radial bearings) and ISO 492 (Radial bearings – dimensions and tolerances). Different tolerance classes or special tolerances can also be delivered upon request.

The manufacturer of your make and model recommends the maintenance schedule for wheel bearing service. But if your wheel is loose while still bolted to its rim, don’t wait because it’s likely your bearing needs to be addressed (servicing or replacing). Another indication wheel bearing service is noise coming from the wheels while you drive. The noise typically sounds like excessive road noise, a loud hum, or grinding. If you notice any of these symptoms, your wheel bearing is in very bad shape and needs to be repaired. Neglecting to repair bearings will cause your car to break down and, in severe cases you can lose a tire while driving…so get it checked out promptly!

In single row angular contact ball bearings, the main dimensions are standardized according to ISO 15 (Radial bearings – boundary dimensions, DIN 616 (Roller bearings – boundary dimensions) or DIN 628-1 (Radial-angular contact ball bearings).

Tandem arrangements, composed of two or three bearings, are used to carry high axial loads in one direction. Thus, high rigidity of the shaft mounting is reached. In tandem arrangements, each bearing carries an equal share of the axial load.

In most cases, the radial load resulting from the weight of the components run on the bearing and the external forces alone is higher than the required minimal load. If the achieved value remains below the minimum, please contact an SLF application technician.

Cylindrical rollerbearings

Single row angular contact ball bearings with universal design are intended for installation in pairs in X, O or tandem arrangement. In universal design, the raceways and lateral faces of the bearing’s inner and outer rings are matched so that arbitrary bearings of the same size and preload /clearance can immediately be mounted in the corresponding arrangements. We distinguish the following universal design types:

Super precisionbearings

Angular contact ball bearings are standard manufactured without seals; consequently, the bearing location has to be sealed around/on the surrounding components. The sealing must ensure that no moisture and contaminants enter the bearing, and that no lubricant is lost. Angular contact ball bearings without seals are delivered ungreased, but must be lubricated with oil or grease. Choose lubricant according to the application.

If your vehicle has serviceable wheel bearings, be sure arrange for wheel bearing service periodically. This type of bearing usually occurs on older cars and 2wd or rear-wheel drive vehicles. It doesn’t take long to inspect them during a service or inspection at Chuck’s locations in North Seattle or Shoreline.

For angular contact ball bearings with universal design, it is possible to use spacers for all arrangements. When manufacturing the spacers, ensure that the inner and outer ring have exactly the equal width and are parallel-sided. When desired by the customer, angular contact ball bearings can also be delivered as bearing pairs with spacers, ready to install, in tandem, O or X arrangement.

For statically loaded angular contact ball bearings, one must check not only nominal lifetime L (L10h) , but also the static load safety factor S0.

Thrust roller bearing

Tapered rollerbearings

To configure the following bearing arrangements, only bearings with universal design in the identical preload and tolerance class are permitted.

The reference speed is calculated according to ISO 15312 and is the speed at which, under defined reference conditions, a bearing operating temperature of +70 °C is achieved. It is not a speed limit for the application of a bearing but provides the basis to compare the speed suitability of different bearing types.

Axial clearance or zero-backlash do not apply to mounted/ installed and unloaded bearing pairs. In tight fits, axial clearance is diminished or preload of the bearing pair is increased.

The TO and TX arrangements are, like the tandem arrangement, applied to carry high axial loads in one direction. The additional third bearing is used as a counterstay and makes the multiple arrangement a fixed bearing.

In single row angular contact ball bearings, the cage made of fiberglass-reinforced polyamide 66 is standard in the hole diameter range up to approx. 130 mm. For the use of the cage made of fiberglass-reinforced polyamide 66, the operating temperate is limited to 120 °C, and the same limitations as for the deep groove ball bearings are applicable. Cages made of brass (standard, if not using the cage made of fiberglass-reinforced polyamide 66), steel sheet or brass sheet can be delivered upon request.

O and X arrangements are applied to carry axial loads in both directions or to carry high radial loads. In the O arrangement, the large faces of the outer rings are adjacent, whereas, in the X arrangement, the small-sized faces of the outer rings are adjacent. The O arrangement is a very stiff mounting, has greater support distance H than the X arrangement, and, as a result, higher tilting resistance.

It probably should come as no surprise to learn that wheel bearings tend to be among the most overlooked parts of a vehicle, even though they are absolutely crucial to the functioning of your car. Your wheels rotate on these bearings; there is one wheel bearing at each wheel. The full weight of your vehicle and everything inside it is supported on these bearings, so eventually they’re going to begin to wear out and will need service or replacement.