Bearings and cams

Question 0

What’s the difference between a journal bearing and a ball bearing?

Answer 0

A ball bearing has an insert of a ball race that holds spherical steel balls.

Question 1

What is the difference between a journal bearing and a plain bearing?

Answer 1

The journal bearing has a layer of oil or grease instead of having a bush insert

Question 2

Pear shaped cams are symmetrically shaped so…?

Answer 2

The rise and fall times are identical

Question 3

What are pear shaped cams used to do in engines?

Answer 3

They are used to control inlet and outlet valves in engines

Question 4

Is this statement true or false? “Eccentric/circular cams are the simplest type of cam as based on an off-centred circular disc”

Answer 4

This statement is true

Question 5

Eccentric or circular cams rise and fall is rough. True or false?

Answer 5

False!

The rise and fall of the eccentric or circular cam is smooth

Question 6

Name one product where eccentric or circular cams are used?

Answer 6

Fuel pumps

Question 7

Acceleration and retardation is constant when using a eccentric or circular cam. True or false?

Answer 7

True

Question 8

What can is used in sewing machines and to wind relay coils? Pear shaped, eccentric, heart shaped or snail cams?

Answer 8

Heart shaped cams

Question 9

As the heart shaped cam is symmetrical, how does that affect the motion?

Answer 9

The motion generated is a continuous motion

Question 10

Snail cams generate output with…?

Answer 10

Uniform acceleration and retardation