Belt Drives

Question 1

What is another name for Belt Drives?

Answer 1

Friction Drives

Question 2

How do Belt Drives transmit power?

Answer 2

By means of belt pressed tightly onto a pulley.

Question 3

The amount of power that a belt drive can transmit is directly related to the _________.

Answer 3

The grip of the belt on the pulley.

Question 4

What does the grip of a belt depend on?

Answer 4

• Area of contact
• Material of the belt and pulley
• Tension in the belt

Question 5

Are crowned Pulleys convex or concave?

Answer 5

Convex

Question 6

When a pulley is grooved it is called a _____.

Answer 6

Sheave

Question 7

What are 4 common belt materials used in the industry?

Answer 7

Cotton
Leather
Rubber
Nylon/ other synthetic materials

Question 8

What does the material determine about the belts friction?

Answer 8

Determines the coefficient of friction

Question 9

What is Installed Tension?

Answer 9

Tension of the belt when the drive is not running.

Question 10

What is Effective Tension?

Answer 10

The tension needed on the belt to transmit power without slipping.

Question 11

When should you retension a new belt?

Answer 11

12 - 24 hours after running

Question 12

What is deflection with belts.

Answer 12

The allowable change in belt depth due to pressure applied.

Question 13

How do you calculate deflection in belts?

Where must this delfection be placed or tested?

Answer 13

• For every inch from the centre of one pulley to the centre of the other pulley 1/64” must be given for deflection.
• Halfway between the two centres of the pulleys

Question 14

How should pulleys look for efficient operation?

Answer 14

Smooth and Rather dull. Not shinny!

Question 15

What will slippage do to belts?

Answer 15

Polish them and lose grip.

Question 16

What is Creep?

Answer 16

When a belt slows down on the unloaded side and speeds up on the tight side. Due to elasticity.

Question 17

What is another name for a belt that is Open Ended?

Answer 17

Reel Stock

Question 18

What loads and speeds are Fabric Belts used with?

Answer 18

Moderate

Question 19

What kind of belting is this?

Answer 19

Compass Belting

Question 20

Compass belting is a single row of _______.

Answer 20

Cords

Question 21

Flat cord belts have what covering them?

For what reason?

Answer 21

• Fabric
• To protect against wear

Question 22

Where are Flat Cord Belts used, relating to loads, speeds and shock applications.

Answer 22

Heavy duty areas for high speed, shock load applications

Question 23

Which has higher capacity and lower stretch: Steel Cable or Cord Flat Belts?

Answer 23

Steel Cable

Question 24

What are the three layers of Synthetic Belts?

Answer 24

Top Cover, Drive Member Pulley Side.

Question 25

What are the three main methods of joining Flat Belts?

Answer 25

Chemical, Vulcanized, Mechanical

Question 26

What is the strongest method of joining Flat Belt ends?

Answer 26

Vulcanized

Question 27

Chemical Splices use what ingredient?

Answer 27

Adhesives

Question 28

Name three types of Mechanical Flat-Belt Fasteners.

Answer 28

Wire Lacing Steel Hinges Plate Fasteners

Question 29

What is Vulcanizing?

Answer 29

When you take sliced belt and heat and pressurize them to bond together.

Question 30

What is the most common method of driving loads between short range pulleys or sheaves?

Answer 30

V-belts drives

Question 31

What is the main advantage of v-belts?

Answer 31

The simple wedge action of the belt against both sides of the sheave groove.

Question 32

What is the power transmission efficiency of v-belts?

Answer 32

As high as 93%

Question 33

Can v-belts handle handle shock loads?

Answer 33

Yes, they can handle shock loads.

Question 34

What are these? Label these.

Answer 34

Common V-Belt constructions

Question 35

What are other names for top and bottom sections of V-Belts?

Answer 35

Top = Extension Section Bottom = Compression Section

Question 36

Where is the tensile strength found on a V-Belt?

Answer 36

Neutral Section. Pulling cords are found there.

Question 37

What are the four main Sections for a V-Belt?

Answer 37

- Cover Section - Neutral Section - Top Section - Bottom Section

Question 38

Where are Single Lay, compass contruction v-belts used?

Answer 38

Short-centre drives with small diameter pulleys.

Question 39

What is this? Where is it used? What can you not do with these belts?

Answer 39

- Multi Layer cord construction with two bands. - Long, heavy duty drives. - Reverse bend them. They can only bend in one direction.

Question 40

What is this?

Answer 40

Grommet-style V-Belts

Question 41

What are two types of design features for V-Belts determine sheave grip?

Answer 41

- Straight (flat) or Concave side walls - Notched (corrugated) or plain undersides.

Question 42

How do Straight and Concave V-Belts grip sheaves?

Answer 42

Question 43

How do Notched V-Belts help?

Answer 43

The notches give the belt increased flexability and heat-dissipation.

Question 44

Where are Notched belts used, relating to speeds, sheave size and pulley distance.

Answer 44

Used on Small-sheaves, short centre, high speed drives

Question 45

What is this?

Answer 45

Reel-stock V-Belts

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