V BELT DRIVES Flashcards
Define pitch
The distance between a point and a similar corresponding point
Define Pitch circle in Belt Drive systems
The circle that goes through the place on each disc, where the speed and force are transmitted
Define Pitch Diameter
Diameter of the Pitch Circle
Define Pitch Length
is the length of the belt that passes through the pitch circles of (2) sheaves
How do you calculate Pulley ratio
Driven over Driver = Pulley ratio
DVN÷DVR=PR
Another name for a Sheave is?
Pulley
(FHP) V-Belt drive are used in what type of setting?
Low power Intermediate Settings
A Belt Drive has 3 features derived from the concept of pitch: Pitch diameter, Pitch Circle and ______?
Pitch Length
The _______ is determined by dividing Pitch diameter of the Driven pulley by the Pitch diameter of the Driver pulley.
Pulley Ratio
V-Belt should ride ____ and does not touch the ____of sheave.
High : Bottom
A common belt used for conveyors is
A Flat Belt
The _____is designed to grip the walls of a grooved pulley
V-Belt
A____ has notches that engage notches in the pulley to prevent slipping
Timing belt
Belt tension is measured by how much ___ is needed to to deflect the belt a certain distance.
Force
Tension is applied to a belt by moving the motor away from the ____ Shaft
Driven Shaft
Describe three (3) methods of measuring belt tension
Hand Pressure
Tension Tester
Spring scale/Straight edge
The ____ is the distance between the points on the sheaves where the belt touches each sheave.
Belt Span
Belt Drive Consist of 3 Basic Components
Belt
Driver Sheave
Driven Sheave
The method used to measure belt tension is called the _________ method.
Belt Deflection
A ________ is a component that attaches the driver and driven sheaves to their shafts.
Bushing
The 3 main types of bushings are: quick detachable (QD), ______ taper, and taper lock.
Split
A split taper bushing differs from a QD bushing in that it has a higher degree of ________ than the QD bushing.
taper
The disadvantage of a split taper bushing is that it can only be installed in one _________.
Direction
A belt size code of 4VX500 indicates a nominal length of _____.
50inch
FHP V- belts are specified by the letter ___ in the belt size code
L
The letter ( V ) in the belt size code specifies ____ V-Belts
Wedge
V-belts are specified by their type, cross sectional size or belt section, and their _____
Length
A QD bushing specification of SK x 1-1/8 signifies a QD bushing with a 1-1/8 inch ____
Bore
A sheave specification of 4BK340SH indicates a sheave with an outer diameter of ____
3.4inch
In the sheave specification of 4BK340SH; the first one or 2 digits indicate ______
the numbers of grooves
What type of belt does sheave 4BK340SH require?
B Belt
What type of belts are measured in Metric system
HTD Belts
______belts and sprockets use the metric system
HTD ( High torque drive )
