Archive for May, 2013

About Needle Roller Bearings

Friday, May 31st, 2013

Needle roller bearings refer to bearings that make use of small cylindrical rollers. They help in reducing friction of a rotating surface. It is a roller bearing that has rollers that have length at least four times their diameter.

Needle bearings contain a large surface area which touches the bearing’s outer surfaces. More to these, there is less added clearance, which is difference between the diameter of the bearing and the shaft, hence their being more compact. The usual structure has the needle rollers themselves, a needle cage that positions and contains the needle rollers, and an outer race.

Thrust needle bearings are flat and make use of a radial pattern of needles. Radial needle bearings are cylindrical in shape and make use of rollers parallel to the axis of the shaft.

Full complement bearings contain solid inner and outer rings and rib-guided cylindrical rollers. Considering such bearings contain the biggest possible number of rolling elements, they have particularly high radial load carrying capacity. Also, they are ideal for mainly compact designs.

Needle bearings are largely utilized in engine components like rocker arm pivots, pumps, compressors, as well as transmissions. The drive shaft of a rear-wheel drive vehicle often consists of at least 8 needle bearings.

Needle bearings have a tinier cross-section, more load-carrying capacity, better rigidity, and less inertia forces that pave way for size and weight cutbacks in machinery. They are built to endure oscillation, run well even under extreme conditions, and interchange with sliding bearings.

Different types of needle bearings with a wide array of sizes and tolerances, for myriads of applications, are now available in the market. These include:

  • Needle roller and cage assemblies are available in single or double row, solid or split cage, metric and inch sizes, as well as in attaching rod bearings for special applications.
  • There are also single and double row bearings with or with no ribs, and with or with no inner rings.
  • Trust bearings are available in single row roller and cage assemblies.
  • Yoke and stud type track rollers are also offered.

 

Automobile Ball Bearings

Friday, May 24th, 2013

Automobiles get to run on roads because of inertia. This lets automobiles move at different speeds just to arrive at a given destination. Such motion may be manipulated through steering, accelerating and braking. However, such techniques can sometimes be inadequate in managing the vehicle, particularly when the surface it is driven on is slippery or very rough. To assist in solving this problem, automobile designers make use of ball bearings.

Ball bearings are rolling elements that are utilized in an attempt to lessen the rotational friction between the vehicle and the surface it is driving on, like cemented roads, for instance. Also, they support axial and radial loads for them to maintain balance when there are speed changes or sudden braking while operating.

In vehicles, ball bearings are inserted inside the wheels of the automobile, in a slot known as the “cage.” Then, these bearings run around the cage as the automobile runs, and they’re functioning so as to evenly distribute the load of the automobile when operating. You could see a reduced but more exhausting driving experience if ever your car load exceeds its weight capacity. The reason for this is because the bearings are no longer able to carry the weight of the automobile.

Ball bearings play a significant role in majority of automobiles. They aid in the improvement of car performance and pave the way for smooth driving, considering the brakes are under less pressure in controlling the vehicle’s speed when running. Bearings also makes it possible for the automobile to adjust in the event it runs through varying terrains, like smooth asphalt streets versus rough roads. Above all, bearings absorb the shock that passengers may feel in the event of sudden braking, or in cases where the automobile collides with another automobile or structure.

Similar to many other parts of an automobile, ball bearings are vulnerable to wear and tear. If you want them fixed, the best way to go about it is replacing them altogether. The best time to do so is when you have also replaced your brakes. This will let you enjoy optimum driving performance, considering both your brakes and the bearings are brand new. It’s also a must to keep your brakes clean when you are looking to maintain better control of the automobile. When you replace only the bearings, it will just improve the automobile’s shock absorption activity, not manage its speed or steering.

Ball bearings are known to enhance automobile performance, but they may also bring about misalignment in the wheel. Such incident can cause vehicular accidents. Drivers may prevent this misfortune through taking their car into a repair shop on a regular basis.

How To Change Trailer Wheel Bearings

Friday, May 17th, 2013

When you service trailer bearings regularly, you can avoid a breakdown on the road. Go ahead, remove the bearings and wash all the old grease out at least every year. But of course, do so more often if your trailer is towed. After removing the grease, meticulously check the bearings and replace any with burred or chipped components. You need not have special tools to replace or service trailer bearings. Here’s a step by step of what you should do:

1. Jack one side of the trailer up, making sure the tire is no longer on the ground.

2. Insert a chisel point behind the ridge on the dust cap, and then tap using a hammer so the cap is loosened. Afterwards, rotate the wheel and insert the chisel in different places to make sure the cap releases evenly.

3. Straighten the ends of the cotter pin and take it out.

4. With a pair of arc joint pliers, loosen and take out the bearing nut. You must then remove the outer bearing and pull the wheel off the spindle.

5. Put the wheel on the ground with the exterior part of the wheel up. Insert a hardwood dowel through the hub and put it against the inside of the bearing. Use a hammer to tap to remove the bearing and seal. You may need to raise the wheel off the ground a little bit to get clearance for the bearing to fall out.

6. Then, wipe off the old grease from inside the hub. You must do so because the older grease might not be compatible with the new grease.

7. Check the wheel bearings after you get rid of the grease using a suitable solvent, like diesel fuel or degreaser solution. Rid yourself of any noisy bearing, considering excess noise is brought about by wear and pitting. Get new bearings in replacement of bad ones.

8. Pack every bearing using high quality wheel bearing grease. You can do so by hand or with the use of a bearing packer.

9. Put a large glob of grease inside the hub, and then insert the inner wheel bearing and seal. A seal driver could come in handy.

10. Slide the hub/wheel assembly on to the axle stub. You should place tape over the axle threads to prevent incurring damage to the new seal. Install the outer bearing, thrust washer (if any) and axle nut.

11. Slowly spin the wheel and tighten the axle nut to the point of feeling resistance to turning freely. Then, loosen the nut and re-tighten so no play is felt in the bearing anymore. Replace the cotter pin with a new one then you must bend the ends over. Lastly, replace the dust cap.

Things To Know About Tapered Roller Bearings

Saturday, May 11th, 2013

Tapered roller bearings refer to bearings that are able to take large axial forces and can sustain large radial forces. To do this, they make use of conical rollers and raceways. They are arranged in order for the rollers and raceways to meet at a common apex. Such rollers are guided by contact between the large end of the roller and a rib on the inner ring. This gives rather high capacity for radial and single thrust loads.

If you go for premium brands, you can rest assured you get premium quality.

Look for tapered roller bearings that have case-carburized components. Cups, cones, and rollers are composed of case-hardened alloy steel of “Bearing Quality” so as to give first-rate fatigue life and consistency. Accurate control of heat treatment, dimensions, and surface finish of the components only add up to the reliability of bearings. You should also aim for having premium steels and heat treatments for extended life and reliable performance.

When you chemically augment the surface chemistry of the roller, you can produce a thin layer of retained Austenite, which brings about compressive stresses that boost the lifespan of bearings.

There are unique micro-pitting surface finishes that boosts bearing life in applications with insufficient lubrication. Based on the theory that oil film formation in bearing contact areas can actually be enhanced through altering the character and direction of the components’ surface finishes, the distinguishing micro-pots can efficiently capture and channel oil to where it’s called for.

Crowned rollers under load distribute stress equally along their full length of contact with the raceways. That being said, they eliminate stress concentration at the roller ends. This design concept also makes up for minor misalignment between shaft and housing bore and deflection under load, in turn lessening stress concentration.

Applications for tapered roller bearings are typically utilized for moderate speed, heavy duty applications in which durability is needed. Common real world applications include agriculture, construction and mining equipment, axle systems, gear box, engine motors, as well as reducers, among others.

Bearings Used In Motorcycles

Friday, May 3rd, 2013

There are many bearings used in motorcycles. The actual number depends on the model and some other structural features. However, there are generally 20 to 30 bearings built in every motorcycle. Such bearings are utilized in revolving parts, supporting the vehicle’s running, which also includes in the engine, the transmission as well as the wheels. With their help, friction is reduced. Additionally, they make certain that the motive power of the engine is consistently transmitted to the wheels.

Motorcycles have gained so much popularity for the ease of transportation they come with. When there is a motorcycle, there will always be bearings rotating. For the engine to have a smooth sound and for the bike to run powerfully, bearings are called for.

There is a relentless yearning of riders across the globe for a thrilling yet comfortable ride along with easy handling. That is why a lot of companies have been putting a premium on to motorcycle reliability and safety these days.

It is a must for bearings of motorcycle engines and transmissions to have excellent rigidity and superb anti-dust features, considering they are always exposed to dusty environments. Otherwise, they are bound for some shock loads at high temperatures and high-speed rotation.

Wheel bearings are used for many different road conditions, as well as riding needs. Thus, endurance even in waters or mud is a must. To meet such demands, go for ones that offer optimum durability, high rigidity, as well as tiptop sealing performance.

There are cases wherein motorcycles don’t have adequate space for the mounting of bearings, but, luckily, there are now companies that came up with a wide product lineup that meets the demands of a many load and rotation speed conditions in limited spaces.

If you are looking for information about specific bearings applications, please contact us at Bearings, Inc.