Belts

Question 1

These belts are constructed by joining two or more standard belts with a common backing

Answer 1

Banded belts

Question 2

These belts are capable of transmitting power on either side in separate direction

Answer 2

Double v belts

Question 3

These belts are designated as 3v , 5v and they are high capacity they provide more support because of the narrow wedge design of high capacity belts

Answer 3

High capacity belts

Question 4

They are designated as J , K , L and M for the same range of applications as high capacity and classical v - belts

Answer 4

Poly v- belts

Question 5

What’s is advantage of varaible speed belts ?

Answer 5

are an economical and simple means of providing infinitely variable speed.

Question 6

This belt can be used in situations where it is difficult or impossible to install an endless belt

Answer 6

Link belts

Question 7

What are some advantages of link belts

Answer 7

. They can be used as an emergency replacements for endless belts
. They are available wit the same power rating as classical v belts

Question 8

This pulley provides a means for tensioning the belt , use a flat pulley at least 1.5 times the diameter of the smaller pulley

Answer 8

Outside idler pulleys

( note the idler goes on the slack side of the pulley.

Question 9

This pulley idler decreases the arc of contact

Answer 9

Inside idler pulley

( put this pulley as far away as the driver)

Question 10

This idler is always 1/3 of the of the span distance from larger pulley.

Answer 10

Contact idlers

Question 11

When you transmit power from horizontal shaft to a vertical shaft use an

Answer 11

Quarter turn drive

Question 12

Checks on a belt

Answer 12

.Squealing sounds on the tight strand indicates misalignment
.Bearings running hot
.Vibration
.Small of burning rubber

Question 13

(Figure 9). The B, C and D cross-
sections are readily available. These belts are constructed by joining two or more
standard belts with a common backing. Joined belts were developed to solve problems of
belt vibration, whip and turnover

Answer 13

Banded belts

Question 14

• Cogs allow greater flexibility and enhanced airflow, resulting in cooler operation.
• Cogs allow the belt to bend around sheaves with a small radius.
• The raw edges have no covers on the sides and bottom.
• Raw edged belts fit the sheaves more accurately than wrapped belts.
Raw edges have a higher coefficient of friction than wrapped belts and can thus transmit more power. This permits the use of smaller belts rather than the standard series of wrapped belts. Therefore, the raw edged belt is more efficient in terms of power transmission, weight and space.

Answer 14

Cogs raw edge belts

Question 16

They were originally used
on drives that could not tolerate any slippage, such as the valve timing belt on an engine,
or in robotics, conveyors and machine tools.

Answer 16

Synchronous belts

Question 17

What is the arc of contact for synchronous belts?

Answer 17

60° minimum six teeth in contact