Bearings & Lubrication

Question 1

State the three general purposes of bearings?

Answer 1

Support loads, reduce friction, maintain alignment

Question 2

List the two broad categories of bearings?

Answer 2

Plain bearings, anti-friction bearings

Question 3

Describe plain bearings?

Answer 3

No metal to metal wear while running. Plain bearings work by a sliding action. The shaft is supported by a thin film of lubricant. Heavier loads and lower speeds.

Question 4

What are anti-friction bearings?

Answer 4

Anti-friction bearings consist of balls or rollers interposed between two surfaces having relative motion. They support lighter loads at higher speeds.

Question 5

What are the functions of lubricants specific to bearings?

Answer 5

1. Minimizes friction at points of contact with in the bearing.
2. Reduces wire.
3. Protects the bearing surfaces against corrosion.
4. Carries away heat generated within the bearing.
5. Dampens or absorbs shock loads.
6. Forms a seal to prevent the entry of foreign material into the bearing.

Question 6

What is a reference that provides guidelines for the proper lubrication of all equipment in the plant?

Answer 6

Station lubrication manual

Question 7

What is the station lubrication manual?

Answer 7

It is a reference that provides guidelines for the proper lubrication of all equipment in the plant.

Question 8

List five indications of improper bearing lubrication?

Answer 8

1. High bearing temperatures.
2. Noise and excessive vibration.
3. Bearing wear.
4. Foreign material in the oil, metal chips and debris.
5. sight glass that shows a higher or lower oil level than expected.

Question 9

What are two specific guidelines listed under lubrication guidelines?

Answer 9

Proper lubrication and good housekeeping

Question 10

What are five personal safety guidelines you should always remember when working with lubricants?

Answer 10

1. Most Lubricants are petroleum based and usually flammable.
2. Always work with adequate ventilation.
3. Ensure the area is free from spark causing or high heat generating equipment.
4. Store flammable solvents and lubricants in approved areas.
5. Wear personal protective equipment.

Question 11

Where are they correct methods and locations for disposing of lubricants outline?

Answer 11

Nuclear site directive

Question 12

The force acting in a 90° angle (perpendicular) to the shaft?

Answer 12

Radial loads

Question 13

They force acting parallel to the shaft and along the axis of the shaft?

Answer 13

Axial loads or thrust.

Question 14

Any substance that is used to reduce friction between objects in relative motion.

Answer 14

Lubricant.

Question 15

Friction reducing mechanical devices that support another machine part, and allow controlled relative motion between mechanical members.

Answer 15

Bearings.

Question 16

List the two broad categories of bearings?

Answer 16

Plain and anti-friction.

Question 17

What bearing uses a sliding action between two surfaces?

Answer 17

Plain bearing.

Question 18

Removing heat is a function of what?

Answer 18

Bearing lubrication or lubrication

Question 19

Describe the importance of proper lubrication for bearings?

Answer 19

Proper lubrication prolongs the operating life and prevents failure due to metal to metal contact, excessive heat, and corrosion.

Question 20

List four primary indications of improper lubrication?

Answer 20

1. Abnormal heat.
2. Noise.
3. Wear.
4. Foreign material in the oil. (Metal, chips, debris,).

Question 21

Low speed and high load are characteristics of what bearing?

Answer 21

Plain bearings.

Question 22

High speed and low loads or characteristics of what bearing?

Answer 22

Anti-friction bearings.