Bearings (Ball Bearing)

Question 1

Consists of one or two cylindrical rows of steel balls positioned between inner and outer race?

Answer 1

Rolling element bearings

Question 2

3 common issues with rolling element bearings:

Answer 2

1) Lubrication
2) Contamination
3) Misalignment

Question 3

This bearing type cost less than roller types and can tolerate light to moderate load?

Answer 3

Ball bearings

Question 4

Small area of contact between the balls and raceway

Answer 4

Point contact

Question 5

Point contact allows operation at _____ speed with minimal ______ and ____ heat generation than roller bearings

Answer 5

High
Fatigue
Less

Question 6

2 classes of precision ball bearings:

Answer 6

1) Precision ungrounded
2) Precision grounded

Question 7

Lower rotational speed, does not require smooth operation

Answer 7

Precision Ungrounded

Question 8

2 basic types of radial ball bearings:

Answer 8

1) Non-filling slot
2) Filling slot (Conrad)

Question 9

2 characteristics to describe filling slot bearings:

Answer 9

1) More balls = heavier load
2) Thrust load = radial load

Question 10

3 characteristics of Non-filling (Conrad) bearings:

Answer 10

1) Less balls = less load
2) Better lubrication
3) Carries thrust load in either direction

Question 11

True or false

Side with filling slot must face the side thrust originates from.

Answer 11

True

Question 12

True or false

There is more friction in line contact than point contact

Answer 12

True

Question 13

Same speed as single row bearings, except handles proportionally higher load and thrust in either direction

Answer 13

Double row ball bearings

Question 14

This bearing compensates for Misalignment between shaft and housing bore?

Answer 14

Self aligning radial ball bearing

Question 15

2 types of self-aligning radial ball bearings:

Answer 15

1) Internal
2) External

Question 16

4 characteristics of self-aligning radial ball bearings:

Answer 16

1) Can take shock
2) Handles small amounts of misalignment
3) Less speed
4) Less load

Question 17

Compared to deep grooves bearings, angular contact bearings handle ______ thrust and _____ radial load.

Answer 17

Higher
Moderate

Question 18

Angular contact bearings can be mounted 3 ways:

Answer 18

1) Tandem
2) Back to back
3) Face to face

Question 19

______ mounting can handle one direction of thrust?

Answer 19

Tandem

Question 20

______ and ______ are bidirectional?

Answer 20

Face to face
Back to back

Question 21

Mounting in tandem maximizes _____ stiffness and _____ capabilities

Answer 21

Axial
Speed

Question 22

This bearing is for vertical shafts and provides shaft alignment

Answer 22

Thrust ball bearings

Question 23

Thrust ball bearings differ from other types because space between rings is oriented _______ to actual rotation

Answer 23

Perpendicular

Question 24

What are the 2 types of thrust ball bearings?

Answer 24

1) Flat race flat seat
2) Grooved race flat seat

Question 25

Characteristics of a flat race flat seat bearing

Answer 25

1) Spins on one side of the bearing
2) Load capacity about 1/3 of grooved race

Question 26

2 Grooved race flat seat characteristics

Answer 26

1) Most common type of thrust bearing
2) Both sides spin

Question 27

3 Precision bearing characteristics

Answer 27

1) High accuracy
2) High speed
3) Demand exact rotation

Question 28

4 Ungrounded ball bearings characteristics

Answer 28

1) Fewer moving parts
2) Less cost
3) Less accuracy
4) Not as good as precision ground bearings

Question 29

3 types of ungrounded ball bearings

Answer 29

1) Radial
2) Thrust
3) Combination

Question 30

Where space, maintenance and weight of a lower gravitational center is important, what type of bearing is used?

Answer 30

Thin section bearing

Question 31

Thin section bearings have a ____ load capacity than comparable conventional bearings

Answer 31

Lower