Alb Mod Belts A

Question 1

V belts transmit power by:

Answer 1

Gripping the sides of the groove in a sheave, and by the tensile members

Question 2

V belts require a minimum of ____° of contact between itself and the pulley

Answer 2

120

Question 3

Standard V belts are made up of these 3 parts: (3)

Answer 3

• tensile members
• compression materials
• cover

Question 4

The amount of power a belt can carry depends on: (2)

Answer 4

• strength of the tensile members

- Grip of the belt

Question 5

The pitch line:

Answer 5

runs through the load carrying zone of the belt, where the tensile members are located

Question 6

____ means an increase in the length of a belt over a period of use

Answer 6

stretch

Question 7

___ is the loss of driving speed through the lengthening and shortening of a belt as it cycles from the tight to the slack side

Answer 7

creep

Question 8

If the arc of the creep on a pulley extends all the way around a pulleys contact area, what happens:

Answer 8

slip

Question 9

Friction is the grip between a belt and sheave. It depends on: (3)

Answer 9

• coefficient of friction between materials
• arc of contact
• tension on the belt

Question 10

This series of V belt is the most widely used. It’s sizes are designated by the letters A, B, C, D or E. A/B are commonly found by themselves, where C/D/E are almost always used in sets.

Answer 10

Classical series

Question 11

This series of belt is designated AX, BX, CX. It has cogs that allow greater flexibility, enhanced airflow, fit sheaves more accurately, has more friction. Cannot be reverse bent, and cannot be used where slippage is required

Answer 11

cogged raw edged belt

Question 12

This series of belt is multiple classical belts bonded to a common backing. B, C, D cross sections are readily available. Developed to solve issues of vibration, whip and turnover

Answer 12

Banded belts

Question 13

This belt series is designated 2L, 3L, 4L, 5L with the number indicating the belt top width in 1/8ths.

Answer 13

Light duty or fractional horsepower belt

Question 14

This belt series is designated 3V, 5V, 8V, with the number indicating belt width in 1/8ths. Provides more support for tensile members. Narrow design. Require more tension and can accelerate sheave wear

Answer 14

High capacity or narrow V belts.

Also available in cogged raw edge designs. (3VX, 5VX) as well as Banded design