Deck 17: Belt and Chain Drives

Question 1

What would be three disadvantages of belt drives?

Answer 1

Not as durable as gears and chains; prone to slippage under load; prone to stretch, requiring an idler to maintain tension; affected by sun, heat, oil; deteriorate with age; require frequent adjustment

Question 2

What is the function of an idler in belt drive design?

Answer 2

The idler is used to help maintain constant tension on the belt.

Question 3

Are the terms pully and sheave used interchangeably?

Answer 3

Yes; both guide the belt in its operation. Sheaves are generally the drive, with the pulley being the driver.

Question 4

What is the belt velocity for the driver described in Question 14 if the pitch diameter is 4.5 in.?

Question 5

Most V-belts function most effectively at what speed and ChaPTer 17 BelT and Chain temperature? drives ProBlems

Question 6

What is the most commonly used power chain in industry?

Question 7

List at least four of the items that must be determined when designing roller chain drives.

Question 8

Define sprocket.

Question 9

List at least five advantages of belt drives.

Question 10

Define pitch line.

Question 11

List at least five advantages of chain drives.

Question 12

What is the ratio of the driver pulley to the driven pulley if the driver operates at 2400 rpm and the driver operates at 600 rpm?

Question 13

The preferred position of chain drive shafts is in a horizontal line or on a line inclined not more than how many degrees?

Question 14

List at least five factors that are involved in the selection of a correct belt drive.

Question 15

Name the three main categories of V-belts.

Question 16

If a small sprocket has 12 teeth and travels at 1600 rpm and the large sprocket travels at 400 rpm, how many teeth does the large sprocket have?

Question 17

Describe positive drive belts.

Question 18

Describe the typical use for flat belts. templates

Question 19

Why are adjustable motor bases used in belt drives? Drafting

Question 20

List at least five advantages of gear drives.

Question 21

When establishing chain length in chain pitches, why is it recommended that the chain length in chain pitches be rounded up to an even number of chain pitches?

Question 22

What is the center distance between shafts in chain pitches if the center distance measures 16 in. and a No. 25 chain is used?

Question 23

Why is correct lubrication of chain drives important?

Question 24

Identify at least three methods of lubricating chain drives.