heavy duty belt drives

Question 1

bushing

Answer 1

a component that attaches the driver and driven sheaves to their respective shafts

Question 2

what are the three types of bushings

Answer 2

quick detachable
split taper
taper lock

all three use some type of tapered bore design

Question 3

quick detachable

Answer 3

most widely used, tapered body pressed and held into the sheave by three bolts ran through three holes without threads

Question 4

advantages of QD bushings

Answer 4

allows a gear or bearing puller to be used for removal

Question 5

split taper bushing

Answer 5

barrel has a greater degree of taper than the QD
has a key for securing it to the shaft

Question 6

taper lock bushing

Answer 6

has a split barrel but no flange
tapered with semi-circular hole both threaded and unthreaded

Question 7

conventional V-belt drive

Answer 7

designed for higher power levels and harsher operation conditions than the FHP drive. designed for continous operation

Question 8

what makes a conventional V-belt drive more powerful than the FHP V-belt?

Answer 8

more cords inside the belt

Question 9

sheaves used for conventional V-belt drives

Answer 9

made of cast iron for greater strength and durability

Question 10

what else is a conventional V-belt drive called and why?

Answer 10

standard multiple belt because it is often used in multiple drive belt sets

Question 11

wedge V-belt

Answer 11

designed to transmit the same or more power in a 40% smaller cross section than a conventional V-belt

Question 12

cog belts

Answer 12

A type of V-belt that has notches in the bottom with exposed rough edges on the sides

Question 13

advantages of a cog belt

Answer 13

allows the belt to better transfer heat
allows the belt to bend around smaller sheaves, enabling the possibility of higher pulley rations
because of the rough edge creating more gripping force, handles ~ 30% more power

Question 14

variable pitch sheave

Answer 14

made of two halves. one half threads onto the other using threaded counterparts
adjust the distance between the two by turning one half(CCW= decrease CW= increase)

Question 15

ten steps for aligning a variable-speed V-belt drive

Answer 15

mount the motor and driven components
inspect the sheaves
mount the sheaves onto the shafts
align the sheaves
mount the belt
apply initial tension to the belt
run the motor for ~one minute to seat the belt
stop the motor and retighten the belt to the correct tension
retension the belt after 24-48 hours of op
adjust the speed of that drive as needed

Question 16

what are the 4 V-belt configurations

Answer 16

open
quarter turn
angle drive
serpentine

Question 17

open configuration

Answer 17

shafts are parallel to each other
E.G simple fan

Question 18

quarter turn configuration

Answer 18

turned 90 degrees to the driver shaft

Question 19

angle drive

Answer 19

uses two idler pulleys to pull the belt so that the driven shaft is turned 90 degrees and ina different plane than the driver shaft
E.G complex conveyor systems and in farm equipment

Question 20

serpentine configuration

Answer 20

belt turns more than one driven sheave. requires that it reverses itself to go aroun an idler pulley

Question 21

idler pulley

Answer 21

third pulley that is used in a V-belt drive to either add tension to the belt, keep long belts from whipping, or auto adjust tension under varying loads