True or False? 1. Roller bearings are preferred to ball bearings in applications

Question

True or False?

1. Roller bearings are preferred to ball bearings in applications where load is high.

2. Circular pitch is higher for course-toothed gears compared to fine-toothed gears.

3. In finite element modeling, a mesh convergence study means that the size of the elements is reduced in subsequent calculations.

4. A car with a torsen differential has all four tires on ice. The engine cannot more the tires.

5. Angular contact bearings are preferred to deep groove bearings when low speed is required.

Explanation / Answer

1.) True . Unlike ball bearings, roller bearings are designed with heavy loads in mind. These bearings are primarily based around a cylinder, meaning this bearing is able to distribute a load over a large area, carrying heavy weights. Also unlike ball bearings, roller bearings are not made to handle thrust loads.

2.) False. Coarse-pitch gearing has teeth larger than 20 diametral pitch -- usually 0.5 to 19.99. Fine-pitch gearing usually has teeth of diametral pitch 20 to 200.

3.) True convergence is the mesh convergence which means reducing systematically the size of elements near the areas of high gradient to get more accurate results.

4.) False

5.) False In high speed applications, such as turbines, jet engines, and dentistry equipment, the centrifugal forces generated by the balls changes the contact angle at the inner and outer race.

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