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The bearings can compensate static shaft misalignments and can therefore tolerate misalignment of the shaft relative to the housing. Aligning needle roller bearings are firmly seated in the housing bore. The bore can therefore be produced easily and economically.

Needle roller thrustbearing size chart SKF

Depending on the size, the base is either smooth or lock-beaded (stiffened). Due to the profiled base, small axial guidance forces are possible.

Needle roller thrustbearing size chart

What about play in the bearing and flange? Raise the vehicle so the wheel is off the ground and then grab at the 12 and six o’clock positions and rock the tire back and forth. As a rule, you should not feel any play or looseness if the vehicle has a sealed wheel bearing cartridge or hubs with a sealed wheel bearing assembly. A little play is normal on older vehicles with serviceable wheel bearings, but a lot of play is not. Refer to the vehicles service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the wheel flange and rocking it back-and-forth and in-and-out by hand. As a rule, you should see no more than five thousandths of an inch of run out if the bearings are good.

Inner rings are made from hardened rolling bearing steel and have precision machined or ground raceways. They are used where:

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Aligning needle roller bearings are units comprising drawn outer cups, plastic support rings with a concave inner profile, outer rings with a spherical outside surface, needle roller and cage assemblies and removable inner rings.

IR inner rings have a precision machined raceway. Chamfers on the end faces allow easy insertion into the bearing and prevent damage to the seal lips of the bearing. Inner rings are available with and without a lubrication hole.

Needlebearing

What about the brakes? A caliper that is sticking, or a brake pad that is loose and dragging, may make a metallic scraping noise as it rubs against the brake rotor or dust shield. The frequency of the noise will also change proportional to vehicle speed, but will often go away or change when the brakes are lightly applied. Noise that occurs only when the driver is braking likely is a brake problem such as worn pads and not a bad wheel bearing.

Axial bearing washers are punched, through-hardened, polished and suitable for use as shaft or housing locating washers. These washers are suitable for use where the adjacent machine part is unhardened but is sufficiently rigid and geometrically accurate.

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LR inner rings have a ground raceway. The end faces are turned and the edges are broken. These rings have larger tolerances than the IR rings. They are thus suitable for applications that allow larger width tolerances and less demanding requirements for axial runout.

Drawn-cup roller clutches give very precise indexing, since the individual spring loading of the needle rollers ensures continuous contact between the shaft, needle rollers and ramps. They allow high indexing frequencies due to their low mass and the resulting low moment of inertia of the clamping elements. They also have a low overrunning frictional torque.

Some designs of drawn cup needle roller bearings are closed at one end. They are thus suitable for closing off the shaft ends of bearing arrangements. This provides protection against injury by rotating shafts and protects the bearing against contamination and moisture.

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Thrustwasher bearing

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They are characterized by a longer rating and operating life – the result of higher dynamic load ratings than those of current standard products. If the load and design envelope are unchanged, X-life bearings have a longer rating life. Longer maintenance intervals are possible.

The tire and wheel assembly can have balance issues that can cause noise proportional to vehicle speed. If you see a wheel that is missing a wheel weight, it could a static or dynamic balance issue. Your best bet might be to use a balancer and see how bad the imbalance is. Also, on a balancer, you can measure rim run out. If the wheel assembly has a high spot as the area comes in contact with the road, it will produce a noise proportional to vehicle speed.

Could the noise be in the tires? Tire noise is always proportional to vehicle speed. The noise generated by a tire can be caused by uneven tread patterns, tire construction and even wheel imbalance. This is typically due to missing tire rotations, or, in some rare cases, a shifted belt or a damaged construction. Visually inspect the tire and run your hands over the tire’s tread to detect uneven blocks or feathering of the inner or outer shoulders of the tire. Spin the wheel and look for excessive radial run out with your eye if possible. The tire and wheel assembly can have balance issues that can cause noise proportional to vehicle speed. If you see a wheel that is missing a wheel weight, it could a static or dynamic balance issue. Your best bet might be to use a balancer and see how bad the imbalance is. Also, on a balancer, you can measure rim run out. If the wheel assembly has a high spot as the area comes in contact with the road, it will produce a noise proportional to vehicle speed. What about the brakes? A caliper that is sticking, or a brake pad that is loose and dragging, may make a metallic scraping noise as it rubs against the brake rotor or dust shield. The frequency of the noise will also change proportional to vehicle speed, but will often go away or change when the brakes are lightly applied. Noise that occurs only when the driver is braking likely is a brake problem such as worn pads and not a bad wheel bearing. What about a CV joint? A popping or clicking noise when turning is a classic symptom of a bad outer CV joint. The noise will also increase as the steering angle is increased. Also, note the condition of a CV joint boot. If it is torn or leaking, the boot should be replaced regardless of the state of the joint. If the CV joint is noisy, it will need to be replaced. What about play in the bearing and flange? Raise the vehicle so the wheel is off the ground and then grab at the 12 and six o’clock positions and rock the tire back and forth. As a rule, you should not feel any play or looseness if the vehicle has a sealed wheel bearing cartridge or hubs with a sealed wheel bearing assembly. A little play is normal on older vehicles with serviceable wheel bearings, but a lot of play is not. Refer to the vehicles service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the wheel flange and rocking it back-and-forth and in-and-out by hand. As a rule, you should see no more than five thousandths of an inch of run out if the bearings are good. What about the road surface? Bearing noise should never be intermittent, but the noise can change due to the harmonics and how the driver hears the road noise due to the road surface. This is why the customer interview is so important. Ask the customer: What does the noise sound like? When does the noise occur? What speed does the noise occur? And, does the noise change when breaking or turning? You should not interrupt the customer or try to diagnose the problem noise during the interview. Always take notes. If you just write on the repair order “Customer states they hear wheel bearing noise,” or “Check for wheel bearing noise,” you’re probably not going to get a proper diagnosis, and this will typically lead to an unhappy customer and an even unhappier technician. I’m Andrew Markel. Thank you very much. This video is sponsored by BCA Bearings by NTN.

CC: Related Articles - The core of electric vehicle drive units   - Electric vehicle radiator and cooling systems  - Inside Chrysler EHPS Systems The BCA Hub video series brings together the latest video tech tips on wheel hubs, bearings and seals, featuring the experts you trust. Brought to you by BCA Bearings by NTN. Learn more at bcabearings.com. The classic symptom of a bad wheel bearing is typically a cyclical chirping, squealing or growling noise that changes proportional to vehicle speed. The sound may disappear at some speeds, or occur only at certain speeds. The noise may get worse when turning, or it may disappear momentarily. So, it’s challenging to make a diagnosis based on noise alone. Components like tires, CB joints and brakes can mimic wheel bearing noise. This is why interviewing the customer, going for a test drive and performing a rigorous visual inspection are critical to resolving the customer complaint. Could the noise be in the tires? Tire noise is always proportional to vehicle speed. The noise generated by a tire can be caused by uneven tread patterns, tire construction and even wheel imbalance. This is typically due to missing tire rotations, or, in some rare cases, a shifted belt or a damaged construction. Visually inspect the tire and run your hands over the tire’s tread to detect uneven blocks or feathering of the inner or outer shoulders of the tire. Spin the wheel and look for excessive radial run out with your eye if possible. The tire and wheel assembly can have balance issues that can cause noise proportional to vehicle speed. If you see a wheel that is missing a wheel weight, it could a static or dynamic balance issue. Your best bet might be to use a balancer and see how bad the imbalance is. Also, on a balancer, you can measure rim run out. If the wheel assembly has a high spot as the area comes in contact with the road, it will produce a noise proportional to vehicle speed. What about the brakes? A caliper that is sticking, or a brake pad that is loose and dragging, may make a metallic scraping noise as it rubs against the brake rotor or dust shield. The frequency of the noise will also change proportional to vehicle speed, but will often go away or change when the brakes are lightly applied. Noise that occurs only when the driver is braking likely is a brake problem such as worn pads and not a bad wheel bearing. What about a CV joint? A popping or clicking noise when turning is a classic symptom of a bad outer CV joint. The noise will also increase as the steering angle is increased. Also, note the condition of a CV joint boot. If it is torn or leaking, the boot should be replaced regardless of the state of the joint. If the CV joint is noisy, it will need to be replaced. What about play in the bearing and flange? Raise the vehicle so the wheel is off the ground and then grab at the 12 and six o’clock positions and rock the tire back and forth. As a rule, you should not feel any play or looseness if the vehicle has a sealed wheel bearing cartridge or hubs with a sealed wheel bearing assembly. A little play is normal on older vehicles with serviceable wheel bearings, but a lot of play is not. Refer to the vehicles service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the wheel flange and rocking it back-and-forth and in-and-out by hand. As a rule, you should see no more than five thousandths of an inch of run out if the bearings are good. What about the road surface? Bearing noise should never be intermittent, but the noise can change due to the harmonics and how the driver hears the road noise due to the road surface. This is why the customer interview is so important. Ask the customer: What does the noise sound like? When does the noise occur? What speed does the noise occur? And, does the noise change when breaking or turning? You should not interrupt the customer or try to diagnose the problem noise during the interview. Always take notes. If you just write on the repair order “Customer states they hear wheel bearing noise,” or “Check for wheel bearing noise,” you’re probably not going to get a proper diagnosis, and this will typically lead to an unhappy customer and an even unhappier technician. I’m Andrew Markel. Thank you very much. This video is sponsored by BCA Bearings by NTN.

Thanks to an improved surface quality, the load ratings of X-life needle roller bearings have been increased even further. The dynamic load rating could be increased by 13 % compared to the previous needle roller bearings. The substantially improved load ratings lead to higher-performance bearings with a longer service life, reduced lubricant load, reduced friction and lower bearing temperatures. The benefits stemming from all of these developments include greater efficiency for your applications and a much better price-to-performance ratio.

The classic symptom of a bad wheel bearing is typically a cyclical chirping, squealing or growling noise that changes proportional to vehicle speed. The sound may disappear at some speeds, or occur only at certain speeds. The noise may get worse when turning, or it may disappear momentarily. So, it’s challenging to make a diagnosis based on noise alone. Components like tires, CB joints and brakes can mimic wheel bearing noise. This is why interviewing the customer, going for a test drive and performing a rigorous visual inspection are critical to resolving the customer complaint.

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Since the needle rollers are not retained by mechanical means, they are secured for transport and fitting by means of a special grease (DIN 51825–K1/2K–30). However, this does not have adequate long-term lubrication capacity. Relubrication is therefore recommended after fitting.

Needle roller bearings have a long track record as proven machine elements for the design of radially compact bearing arrangements with very high load-carrying capacity. In X-life configuration, they now have an up to 50 % longer service life.

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Drawn-cup roller clutches can be used in various applications such as indexing clutches, back-stopping clutches and overrunning clutches. In these cases, the drawn cup roller clutch performs an overrunning or locking function.

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The radial internal clearance can be influenced by the needle roller sort as well as by the shaft and housing tolerances. Needle roller and cage assemblies require a hardened and ground raceway on the shaft and in the housing.

Thrustball bearing

What about the road surface? Bearing noise should never be intermittent, but the noise can change due to the harmonics and how the driver hears the road noise due to the road surface. This is why the customer interview is so important. Ask the customer: What does the noise sound like? When does the noise occur? What speed does the noise occur? And, does the noise change when breaking or turning? You should not interrupt the customer or try to diagnose the problem noise during the interview. Always take notes. If you just write on the repair order “Customer states they hear wheel bearing noise,” or “Check for wheel bearing noise,” you’re probably not going to get a proper diagnosis, and this will typically lead to an unhappy customer and an even unhappier technician. I’m Andrew Markel. Thank you very much. This video is sponsored by BCA Bearings by NTN.

Full complement drawn cup needle roller bearings with open ends have the maximum number of needle rollers and therefore offer extremely high load-carrying capacity within a very small design envelope. However, their use at high speeds is restricted.

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Axial needle roller and cage assemblies consist of plastic or metal axial cages with integrated needle rollers and have a very low axial installation height. They support high axial forces in one direction. Radial loads must be supported by separate means. Axial needle roller and cage assemblies require hardened and ground running surfaces as a raceway.

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Drawn cup needle roller bearings with open ends are supplied with a needle roller and cage assembly or a full complement needle roller set. Bearings with needle roller and cage assemblies allow higher speeds than the full complement designs.

Needle rollerbearing

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Needle roller and cage assemblies are single or double-row units comprising cages and needle rollers. As their radial design height only corresponds with the diameter of the needle rollers, needle roller and cage assemblies can be used to realize bearings with a minimal radial design envelope. They have high load carrying capacity, are suitable for high speeds and are particularly easy to fit. If the raceways are produced to high geometrical accuracy, bearing arrangements with high runout accuracy can be achieved.

In these bearings, the raceways have optimized roughness and geometrical accuracy. This gives a higher load-carrying capacity and longer service life. X-life is the premium brand that identifies particularly high-performance products under the INA and FAG brands.

What about a CV joint? A popping or clicking noise when turning is a classic symptom of a bad outer CV joint. The noise will also increase as the steering angle is increased. Also, note the condition of a CV joint boot. If it is torn or leaking, the boot should be replaced regardless of the state of the joint. If the CV joint is noisy, it will need to be replaced. What about play in the bearing and flange? Raise the vehicle so the wheel is off the ground and then grab at the 12 and six o’clock positions and rock the tire back and forth. As a rule, you should not feel any play or looseness if the vehicle has a sealed wheel bearing cartridge or hubs with a sealed wheel bearing assembly. A little play is normal on older vehicles with serviceable wheel bearings, but a lot of play is not. Refer to the vehicles service specifications for the maximum amount of acceptable play. Wheel bearing play can be measured with a dial indicator by placing the dial indicator against the wheel flange and rocking it back-and-forth and in-and-out by hand. As a rule, you should see no more than five thousandths of an inch of run out if the bearings are good. What about the road surface? Bearing noise should never be intermittent, but the noise can change due to the harmonics and how the driver hears the road noise due to the road surface. This is why the customer interview is so important. Ask the customer: What does the noise sound like? When does the noise occur? What speed does the noise occur? And, does the noise change when breaking or turning? You should not interrupt the customer or try to diagnose the problem noise during the interview. Always take notes. If you just write on the repair order “Customer states they hear wheel bearing noise,” or “Check for wheel bearing noise,” you’re probably not going to get a proper diagnosis, and this will typically lead to an unhappy customer and an even unhappier technician. I’m Andrew Markel. Thank you very much. This video is sponsored by BCA Bearings by NTN.

Drawn-cup roller clutches are one-way clutches comprising thin-walled, non-cut outer rings with ramps on the inside diameter, plastic cages, pressure springs and needle rollers. They can transmit torques in one direction and are radially compact. The roller clutches are available with and without bearing supports.

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Axial needle roller bearings are construction units consisting of axial needle roller and cage assembles and thrust bearing washers with centering spigots. They can be combined with drawn cup needle roller bearings with open ends, drawn cup needle roller bearings with closed ends and needle roller bearings. The running surface for the needle roller and cage assembly must be hardened and ground.