Mechanical Drives and Power Transmission Training
description
Transcript of Mechanical Drives and Power Transmission Training
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Basic Mechanical Drives and Power Transmission Training
December 2007
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Mechanical Drives/Power Transmission Training
The purpose of this presentation is to
provide a overview of industrial drives and their maintenance.
Gear Drives Belt Drives V-Belt Maintenance Chain Drives Sprocket and Roller Chain Maintenance
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Gear Drives
December 2007
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Mechanical Drives/Power Transmission Training
Gear Boxes
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Mechanical Drives/Power Transmission Training
Types
Types Automotive transmissions Auxiliary transmissions Transfer cases Power takeoffs Marine gears Hydraulic drives Industrial transmissions Differentials
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Mechanical Drives/Power Transmission Training
Gear Boxes
Series trains Planetary gearing Speed reducers
Base mountedShaft mounted
Speed increasers
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Mechanical Drives/Power Transmission Training
Gears and Gear Boxes
A gear is a form of disc, or wheel, that has teeth around its periphery for the purpose of providing a positive drive by meshing the teeth with similar teeth on another gear or rack.
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Mechanical Drives/Power Transmission Training
Right Angle Gear Drive
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Spur Gears
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Involute Curve
Cord
Base Circle
Circle involute
Circle
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Mechanical Drives/Power Transmission Training
Pressure Angle
Pressure Angle
Pressure angle
Pressure angle
RotationLine of action
14 ½ ° 20°
Direction of tooth to
tooth push
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Mechanical Drives/Power Transmission Training
Pitch Diameter and Center Distance
2
21 DDC
221 DCD
Center Distance C
Pitch Diameter D1
Pitch Diameter D2
122 DCD
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Mechanical Drives/Power Transmission Training
Circular/Diametrical Pitch
Circular Pitch
3.1416”
1 2 3 4 5 6 7 8 9 10
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Mechanical Drives/Power Transmission Training
Names of Gear Parts
Clearance
Pitch Circle
Addendum
Pitch Circle
DedendumWhole depth
Working depth
ThicknessCircular
pitchPitch Line
Addendum
Dedendum Whole depth
Thickness
Circular pitch
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Mechanical Drives/Power Transmission Training
Backlash
Backlash
Pitch Line
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Mechanical Drives/Power Transmission Training
Other Gear Types
Bevel and Miter Helical Worm Herringbone
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Bevel and Miter Gear
Shaft Angle
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Helical
Helix angle
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Worm Gear
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Herringbone Gear
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Gear Damage
Vibration Frequency Component – gear mesh Normal profile
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Mechanical Drives/Power Transmission Training
Troubleshooting
Inappropriate bidirectional operation Gear overload Misalignment Poor maintenance Induced misalignment Visual inspection
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Wear patterns
Normal
Abrasives in lubricating oil
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Pattern caused by corrosive attack on gear teeth
Pitting caused by gear overloading
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December 2007 Belt Drives
Belt Drives
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Mechanical Drives/Power Transmission Training
Introduction
DescriptionBasic Components
Load carrying sectionRubber compression sectionCover
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Mechanical Drives/Power Transmission Training
Belt Drives
Belt drives are used to transmit power between a drive unit and a driven unit
Drive Motor
Driven Unit
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Belts
The size of the belt must match the sheave size. if they do not match, then the belt will not make proper contact with the sheave and will decrease the amount of load it can transmit.
A
AB
B
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Belt Selection
Standard V-Belt Cogged Belt
Joined V-Belt Positive Drive Belt
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Sheaves
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Shaft Speed
erave_diametDriven_she
_rpmdriveshaftncheseDiameterIDriveSheavt_rpmDrivenShaf
12 inch dia.
6 in dia.
1800 rpm
DriveDriven
rpm
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Driven Sheave Diameter
ft_rpmDriven_sha
_rpmdriveshaftncheseDiameterIDriveSheavveDiameterDrivenShea
___ inch dia.
6 in dia.
1800 rpm
DriveDriven
900 rpm
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Belt Length
12 inch dia.
6 in dia.
DriveDriven
35 inches
2centercenter_to_2
3.14meterdriven_dia2
3.14eterdrive_diamhBelt_lengt
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Belt Speed
12
14.3 rpmdiameterFPM
12 inch dia.
6 in dia.
1800 rpm
DriveDriven
900 rpm
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December 2007
V-Belt Maintenance
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Belt Maintenance
Routine maintenance is essential if a belt drive is to operate properly
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Belt Maintenance
Never force belt onto sheave Belt should not ride on bottom of sheave. Check belt condition Belt alignment Tension Inspect sheaves and shafts Belt stretch
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How to Read V-belt Numbers
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Classic Cog V-belts AX-BX-CX-DX
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D-V Wedge Belts 3VX-5VX-8V
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Classic V-belts A-B-C-D-E
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V-belt Inspection
Slapping Squealing Check belt
condition Tightness Tension
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V-belt Sidewall Wear
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V-belt Worn Cover/soft or Swollen
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V-belt Slips, Squeals (Spin Burn)
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V-belt Underside Cracked
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V-Belt Cover Split / Missing Cogs Belts pried upon
Foreign objects Excessive heat Sheave too small Sheave misaligned Improper storage
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Sheave Inspection
Sheave groves must be
like this
not this
Dished out
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Sheave Inspection
5V
10.01-16.0O.D.
40 deg
Under 10.0O.D.
38 deg
Over 16.0O.D.42
deg
Example sheave gauge
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Alignment
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Types of Misalignment
Angular Misalignment
Parallel Misalignment
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Shaft Alignment
Cord tied to shaft
Cord touching sheaves at points indicated by arrows
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Tensioning V-belts Drives
Too tight
Too loose
Slight bow
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Check Tension
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Preventative Maintenance
Check belt condition Check belt tension Identify sources of contamination Check sheave alignment Check sheave wear
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December 2007
Chain Drives
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Mechanical Drives/Power Transmission Training
Introduction
DescriptionTypes of links
Self forming teethExtended Pin
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Mechanical Drives/Power Transmission Training
Introduction
DRIVEN ROLL
DRIVE GEAR BOX
Chain Pitch
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Chain Drive
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Advantages No slippage More compact than belt Good for slow speeds Easier to install Not subject to deterioration Operates under wet conditions Less adjustment required Can drive several shafts Less costly than gear drives
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Disadvantages Cannot be used where drive must slip Cannot except misalignment Noisy Causes vibration Needs frequent lubrication Small load capacity Shorter Service Live
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Chain Drive Principles
Drive chain
Drive Sprocket
Sprocket
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Shaft Speed
teethcket_#DrivenSpro
_rpmdriveshaftteethket_#DriveSproct_rpmDrivenShaf
12 T 6 T
1800 rpm
DriveDriven
rpm
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Chain Length Calculation
2nterCenterToCe2
PitchcketTeethDrivenSpro2
PitchketTeethDriveSprochChainLengt
12 T 6 T
DriveDriven
35 inches
40 Chain
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Chain Speed
12
rpmpitchteethFPM
12 T 6 T
1800 rpm
DriveDriven
900 rpm
40 Chain
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Some Chain Drive Examples
Fork Lift Roller Conveyor
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December 2007
Sprocket and Roller Chain Maintenance
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Roller Chain
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Pitch
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Large Pitch Conveyor Chain
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Chain Part Friction Areas
Major friction areas in red
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Lubrication Methods
Hand Oiling Drop Lubrication Oil Bath Rotating Plate Forced Circulation
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Example Application Large Roller Chain Multi-strand conveyor Large Roller Chain
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Sprockets
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Sprocket Classifications
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Chain Drive Factors
Location of slack Chain wrap Vertical arrangement
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Installation – Parallel Shafts
Level
Level
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Installation
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Installation - Sprockets
Straight edge or Straight string
Gap
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Installation
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Chain LengthThe following information is needed for an equation to find the chain length:
1. Number of teeth on the drive sprocket. 2. Number of teeth on the driven sprocket. 3. Center-to-center distance between the shafts. 4. The chain pitch in inches.
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Chain Inspection Cleanliness Lubrication Signs of wear Flexibility Check chain stretch Physical damage
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Chain Wear
WORN CHAIN
NEW CHAIN
SPROCKET
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Sprocket Tooth Wear SPROCKETS INDICATE
WEAR HERE
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Mechanical Drives/Power Transmission Training
Preventive Maintenance
Inspect for wear Lubricate Check chain sag Set tension Inspect sprockets
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Mechanical Drives/Power Transmission Training
Summary and Quiz
Review Objectives Question and Answer Session