Rolling Element Bearings

Question 1

Rolling element bearings

Answer 1

One or two rows of balls or rollers

Question 2

Main factors are?

Answer 2

Radial speed, radial load, and thrust load (proportional, one goes up other 2 go down)

Question 3

Two things that cause premature failure in bearings

Answer 3

Lubrication and particulate contamination (misalignments cause this)

Question 4

2 types of radial ball bearings

Answer 4

Conrad and filling slot

Question 5

Conrad bearings

Answer 5

Highest speed, High radial load, thrust load is moderate in either direction.

Question 6

Filling slot bearing

Answer 6

+ heavy radial load, - lower radial speed, - lower thrust, - 0 thrust with no load, - thrust has to face filling slot

Question 7

Double row deep groove bearings

Answer 7

Breaks all the rules. Thrust is good in both directions, radial load can double, but speed stays the same. No disadvantages

Question 8

Self aligning radial ball bearing

Answer 8

Two rows of balls on independent inner races. - spherical outer race, - lower radial load and speed, + thrust load, + handles vibration, + handles misalignment less than 3 degrees

Question 9

Angular contact bearings

Answer 9

Solution to thrust loading. Radial and speed are lower but thrust is high in one direction. Can be oriented in pairs - tandem for thrust loads in one direction- or face to face - back to back for thrust loads in both directions.

Question 10

Thrust ball bearings

Answer 10

Carry primarily thrust loads Perpendicular to the axis of rotation. Low speed and low radial load. High thrust load

Question 11

Flat race flat seat bearings

Answer 11

Two flat washer type races. Ball retainer assembly. Best suited for light loads. Load capacity is 1/3. It’s a type of thrust bearing.

Question 12

Grooved race flat seat bearings

Answer 12

Most common thrust bearing. Two grooved washer type races. Higher thrust and radial loads, but same speed

Question 13

3 ways to mount angular bearings in pairs

Answer 13

Tandem, back to back and face to face

Question 14

Ball bearings

Answer 14

Cost less than roller types. Used for light to moderate loads. Have point contact

Question 15

Precision bearings

Answer 15

High accuracy and speed, smooth running. 50xs the cost, bad vibration and durability

Question 16

Thin section bearings

Answer 16

Ball and roller types. Small envelopes reducing drive weight and size. Less speed and radial load.