Bearing Lubrication

Question 1

2 main types

Answer 1

Grease and oil

Question 2

Grease

Answer 2

Easier to contain. Used for low and moderate speeds.

Question 3

Oil

Answer 3

Used in high speed and temp. More difficult to seal and retain. Excessive oil viscosity may cause skidding.

Question 4

Lubricating oils

Answer 4

Either petroleum or synthetic

Question 5

Petroleum

Answer 5

Least expensive and widely used. Low to moderate speed and temp. Made from fossil fuels

Question 6

Synthetic

Answer 6

Wider temperature range, high speed, and more costly

Question 7

Linear bearing

Answer 7

No rotation. Straight line motion only. Has fixed support from a rail, way, or guide. (definition) and list rail way and guide

Question 8

Seals

Answer 8

Keep elements out and lubrication in

Question 9

Contact seals

Answer 9

Maintain contact with both rotating and stationary components to prevent lubrication Loss. Higher heat generation

Question 10

Non contact seals

Answer 10

Provide a clearance between rotating and stationary parts. Good for high speed because friction and heat are eliminated. Labyrinth seal

Question 11

Shields

Answer 11

Effective in keeping larger contaminants out and help retain grease. Better in high heat

Question 12

Mounted bearing

Answer 12

Provides shaft support for radial, thrust, or a combination of loads. Used on vertical and horizontal surfaces. Forces should be perpendicular to the base. Pillow blocks are most popular. (3 types)

Question 13

Split housing

Answer 13

Best used when bearing components need replaced on a regular basis

Question 14

Flanged cartridge block

Answer 14

Mounted on vertical surfaces where a shaft passes through a machine frame at a right angle. Definition

Question 15

Piloted flange

Answer 15

Provides a better mounting accuracy and more support than a basic unit.

Question 16

Take up units

Answer 16

Used to adjust the center distance between shafts or where belt tightening is required (definition)

Question 17

2 mounted rolling element collars

Answer 17

Set Screw collar (one point of contact) and eccentric collar (clamped around whole shaft) (name)

Question 18

Rod end bearing

Answer 18

Commonly used in linkages and low speed applications. Accommodates angular misalignment. (Definition)

Question 19

Cam type and load following bearings

Answer 19

Accommodate both symmetrical and elliptical motion.

Question 20

Dry lubricants

Answer 20

Used in high temperature and low speed. (Severe applications)

Question 21

Viscosity

Answer 21

Oils resistance to flow

Question 22

2 main differences in lubricating oils

Answer 22

Cost and the temperature ranges