Scribd
Upload
149 views2 pages

Selection of 'V' Belt

This document summarizes the selection of a V-belt to drive a 5 HP blower with a motor speed of 1500 RPM. It details measurements taken of the pulley diameters and center distance. Using these values and standard pulley sizes, it calculates the pitch length, inside length, speed, and power rating of potential belt options. It determines a 'B51' belt, which has a power rating of 7.76 HP for 2 belts, higher than the 5 HP required, is suitable with an adjusted center distance of 17.3 inches.

Uploaded by

Amit
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
149 views2 pages

Selection of 'V' Belt

This document summarizes the selection of a V-belt to drive a 5 HP blower with a motor speed of 1500 RPM. It details measurements taken of the pulley diameters and center distance. Using these values and standard pulley sizes, it calculates the pitch length, inside length, speed, and power rating of potential belt options. It determines a 'B51' belt, which has a power rating of 7.76 HP for 2 belts, higher than the 5 HP required, is suitable with an adjusted center distance of 17.3 inches.

Uploaded by

Amit
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
You are on page 1/ 2

SELECTION OF 'V' BELT TO DRIVE BLOWER

POWER RATING OF BLOWER (HP): 5


MOTOR SPEED (RPM): 1500
MEASURED VALUE AT SITE
CENTRE DISTANCE, 'C' (inch) : 16.34
O.D. OF SMALL PULLEY (MOTOR) (inch): 4.49
O.D. OF LARGE PULLEY (BLOWER) (inch): 4.69
SPEED RATIO (i): 1.04
V' BELT SECTION: B' SECTION

AS WE HAVE TO DESIGN PULLEY ALSO,


TAKING STANDARD SMALL PULLEY PITCH DIA, 'd' (inch): 5.5
KEEPING SPEED RATIO SAME AS 1.04
LARGE PULLEY PITCH DIA, 'D' (inch): 5.72

NOW, PITCH LENGTH OF 'V' BELT, L, (inch) = 2XC + {(D-d)²/4C} + 1.57X(D+d)


50.493
NOW, AS PER FENNER CATALOGUE, FOR 'B' SECTION PITCH LENGTH EXCEEDS INSIDE LENGTH BY 1.18
SO, THE INSIDE LENGTH OF BELT IN INCH = 49.313
POWER RATING CALCULATION OF BELT
BELT SPEED (FPM) = 0.262 X d X RPM of d
2161.5
NOW, FROM MITCHELL HP RATING TABLE FOR B SECTION V-BELT
AT BELT SPEED, FPM= 2100 AND d= 5.5
HP RATING OF SINGLE BELT = 3.88
TAKING NO. OF BELTS = 2
HP RATING OF SELECTED BELT DRIVE = 7.76

AS THE POWER RATING OF BELT DRIVE IS HIGHER THAN THAT REQUIRED BY BLOWER, OUR DESIGN IS
SELECTED BELT IS 'B51' WHICH MEANS A 'B' TYPE V-BELT WITH 51 INCHES (CLOSER TO CALCULATED VA
FOR THIS BELT WE HAVE TO ADJUST THE CENTRE DISTANCE TO 17.3 INCHES
R

²/4C} + 1.57X(D+d)

EDS INSIDE LENGTH BY 1.18 inch

BY BLOWER, OUR DESIGN IS O.K.


S (CLOSER TO CALCULATED VALUE OF 49.313) INSIDE LENGTH.

You might also like