/
V-Belt Drive Application V-Belt Drive Application

V-Belt Drive Application - PowerPoint Presentation

trish-goza
trish-goza . @trish-goza
Follow
487 views
Uploaded On 2016-07-11

V-Belt Drive Application - PPT Presentation

Rick Stewart Belt Drives on HVAC Equipment Advantages Terms Belt Construction Belt Length Variation Replacement amp Equipment Dynamics Proper Drive Maintenance Importance Safety Belt Tension Worn Sheave Increasing Drive Life ID: 400446

belts belt sheave drive belt belts drive sheave amp sheaves groove wear motor tension efficiency worn cost energy design life proper load

Share:

Link:

Embed:

Download Presentation from below link

Download Presentation The PPT/PDF document "V-Belt Drive Application" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.


Presentation Transcript

Slide1

V-Belt Drive ApplicationRick StewartSlide2

Belt Drives on HVAC Equipment:

Advantages, Terms, Belt Construction, Belt Length Variation, Replacement & Equipment Dynamics, Proper Drive Maintenance: Importance, Safety, Belt Tension, Worn Sheave, Increasing Drive LifeEnergy Savings Opportunities:Upgrade Belt, Sheave Wear & Proper TensionEnergy Savings Opportunities Part II: Retrofitting old worn out drivesSustaining Drive Efficiency: Self- Tensioning Motor Bases & Automatic Bearing LubricatorsSummary: Tools & Available Resources Questions? & Contact Information

WHAT WE WILL COVER:Slide3

Belt Drives on HVAC Equipment

Slide4

Equipment Dynamics

Traditional Center

Distance Requirement

(20-28 inches)

New Center Distance

Trend

(

12-18 inches)

Shorter Center

Distances –

Increased Belt Cycles

Lighter

Structural

Framework –

Harder to maintain proper alignment & drive tension. Drive is twisted causing issues. Higher Speeds – Need for better system balance to prevent vibration & noise issues.

OEM trends

for smaller center

distances.

This puts much greater but demands more

for the entire drive Slide5

Economical -Low initial cost and low cost to maintainQuiet - Smooth, quiet operationClean- N

o lubrication is required

Easy to install & maintain – Belts wear gradually Forgiving - Withstand installation/maintenance abuse & still give good drive lifeEfficient – Drive performance between 94 - 98% when maintained & installed correctlyAvailability – Replacements can be purchased everywhereVersatile – cover a wide range of horsepower's & speedsRugged – Last for long periods of time Shock AbsorbingAdvantages of using V-Belt drivesSlide6

Key Terms and Definitions

Center

Distance - Amount of distance between driver and driven shaftsService Factor - Required Horsepower x Service Factor = Design HorsepowerDatum Diameter – The Datum Diameter as the effective diameter for determine the pitch length of the belt for center distance calculation. Listed for A, B, C & D Sheaves. Adopted in 1987 by RMA/MPTA.Pitch Diameter – The diameter where the belt cords are placed in a belt. Torque - A twisting or turning force As speed decreases, torque increasesRatio – Driver divided by DrivenSlide7

Fabric Polyester cords Neoprene Rubber

Belt construction

What they do:Transmit torque & HorsepowerHeat and Oil ResistantStatic ConductingLow VibrationLow MaintenanceGood for Shock LoadsWrapped BeltCogged (Raw-Edge) Belt

Fabric

Polyester cords

EPDM

Cogged Belts:

Transmit

more horsepower

Run cooler; Ave 16º to 30º

Temperature Range -60º to +250º

Slightly louder

Need closer alignment

Slide8

Belt Length Variation

Standard Standard Datum Lengths Permissible Matching Matching Matching

Length Cross Section Deviation from Limits for Limits for Limits forDesignation A,AX B,BX C,CX D Std. Datum Lgth One Set Code 1

Machine

26 27.3 +0.6 -0.6 0.15 0.15 0.10

31 32.3 +0.6 -0.6 0.15 0.15 0.10

35 36.3 38.8 +0.6 -0.6 0.15 0.15 0.10

38 39.3 39.8 +0.7 -0.7 0.15 0.15 0.10

42 43.3 43.8 +0.7 -0.7 0.15 0.15 0.10

46 47.3 47.8 +0.7 -0.7 0.15 0.15 0.10

51 52.3 52.8 53.9 +0.7 -0.7 0.15 0.15 0.10

55 56.3 56.8 +0.7 -0.7 0.15 0.15 0.10

60 61.3 61.8 62.9 +0.7 -0.7 0.15 0.15 0.10

69.3 69.8 70.9 +0.7 -0.7 0.30 0.24 0.10

75 76.3 76.8 77.9 +0.7 -0.7 0.30 0.24 0.10

80 81.3 +0.7 -0.7 0.30 0.24 0.1081 82.8 83.9 +0.7 -0.7 0.30 0.24 0.10

RMA*

* RMA = Rubber Manufacturers of America (also ANSI Standard)Slide9

Always replace with like or higher design. Different styles of belts may have the same dimensions, but mush different horsepower characteristics.Replacing a B for a BX or a 5L with a B Belt will lead to:

Shorter belt life and continuing to install incorrect belt on drive.

Never mix new and used of different manufacturers on the same drive. Cord location is different and may result in shorter belt life and maintenance issues with the unit.Replacement DynamicsSlide10

FHP are:

8000 HourDesign Life

Classical

& 358 are:

25,000 Hour

Design Life

Different Cross Section have

Different

Design

Life

&

D

ifferent

Horsepower Ratings

Belt Design Life:

Factors that can reduce belt life:

Excessive sheave groove wear & improper alignment

Lack of proper tension of the drive

Temperature: High Ambient or from a processSlide11

Proper Drive Maintenance

Slide12

Proper Maintenance Important

Poor Maintenance Cost Time!

Time is Money!Doing the same or more with fewer people!Resources leave & don’t get replaced

Budgets getting cut!

L

ess money to do all the things in need to get done.

Looking for Higher Return on What I do get to spend!

Return on Investment to the Organization (ROI). Slide13

Safety First!

Always turn off and lock

out power source. Observe all other safety procedures.Wear required protective gear or equipment, based on site requirements.Loss of production hours.Critical System – Unscheduled downtimeSlide14

What do you see once the belt guard is removed?

Look at the

drive elements – belts, sheaves, bearings Inspect belts for signs of failure:Glazing or cracked sidewalls

Uneven wear on sidewall of a belt

Excessive belt dust

Check sheave

alignment

Inspect

sheave

Even Groove wear

Belts bottoming out

Any bearing lubrication issues

Excessive heat

Inspect the blower for other problems

Inspect

the DriveSlide15

Inspect Sheaves on a regular basis

Clean dirt or rust out of sheave groove

Dirt and rust are abrasive to beltInspect for damaged or worn groovesCheck wear with groove inspection tool or straight edgeThe smaller sheave (Motor) will show wear firstSlide16

Worn sheaves

load

on the end cords higher, lead to rapid belt failure and more frequent replacementBelt should never ride in bottom of groove

Check for groove wear >

1/32”

Sheave Groove Wear

When do sheaves need replacing?

Check sheaves every time belts are changed.

The smaller diameter sheave (usually the motor sheave) will always wear out first, typically needs to be

replaced with every 3

rd

or 4

th

belt change.Slide17

What happens with continued use of worn sheaves

Loose adequate sheave sidewall contact. This can cause belts to slip causing excess friction & heat causing the belt to fail prematurely.

Sheave walls become “dished” which reduces the ability of the V-Belt to wedge in the groove. Less contact between the groove and belt surfaces.Reduced air flow for the blower unit. The smaller sheave will always wear out faster. In many cases this is the motor sheave, this will change the drive ratio & reduce air flow.Belt cords are un-evenly loaded.Not much different than using a new and used belt or 2 different manufacturers belts on the same drive. Just internal to the belt.Uneven wear on multiple groove sheaves can create uneven load sharing across all belts reducing efficiency and possibly creating vibration and noise.Slide18

Aligning Sheaves

4 point static contact with straight edge

ensures alignment4 point static contact per side when using cord or string

C

an use a laser, but they are expensive, need to be maintained and take a some time when variable pitch sheaves are involved.Slide19

Misalignment & V-Belt Angle

Sheave should aligned within tolerance of specific style of belts:

Wrapped Belts (FHP, A, B & 5V): ± 2˚ Notched Belts (AX, BX, 3VX & 5VX): ±1/2˚There are 3 Basic Types of Sheave & Shaft MisalignmentSlide20

How to correctly tension belts

+

Motor

Blower

+

The good old “Thumb Rule”

Deflect the belt about ½ inch

Too little tension the drive till the belt chirps on start up!

This generates heat and will cause belts to fail prematurely

Too much tension can over

load

the bearings!

Excessive

load can

damage the motor and fan bearings

Move the sheaves as close to the bearings as possible

Reduce the cantilevered load on the shafts

This is what most technicians are using!

What

should be using!

Accuracy and Consistency are Key!Slide21

Percent Slip

98%

Optimal

82%

Under-Tensioned

Energy loss from Belt slip

(result of poor tensioning)

Under-tensioned V-belts slip which causes efficiency

loss, premature belt wear and sometimes noise.Slide22

So why are Belts under tensioned?

Belts that are

“rolled” onto the sheaves without adjusting the motor base do not apply sufficient tension to prevent belt slip.Old belts are cuts off the drive and the motor base is not repositioned toward the blower the belt is forces over the rim of the sheaves. This damages the cores of the belt and if a screwdriver or pry bar is used, could create nicks in the groove of the sheaves. Worn sheaves don’t provide adequate sheave sidewall contact. The belt are pulled deeper in the grooves providing less over all tension to the drive. Belts go slack after being run for a little while. When they seat themselves in the groove of the sheave. Replacing belts and moving the motor base back to a “preset mark” does not ensure proper tension.Using an idler can help to apply tension but must be adjusted or re-adjusted to provide the proper force.Slide23

Double Check Belt HP Rating Verify motor nameplate

HP

ratingExample: 20HP @ 1760 RPMInstalling NEW BeltsInstalling new belts:Use all the same brand on the drive.Never Pry Belts onto sheaves.Slide24

Energy Saving Opportunities

Slide25

The Browning “Save the Green Campaign!”Slide26

HVAC Fan and Blowers

Proper Belt Tension

– 10-15% loss if under-tensioned Belt type

– 3-5% gain by replacing wrapped V-Belts with raw edge V-Belts

Maintenance

- 5-8% loss can occur due to Sheave wear

Ask to see our Energy Calculator that can run specific

application for horsepower and by state.Slide27

Energy Efficiency for Different Belt TypesWrapped vs. Raw Edge

Raw edge cogged V-Belts provide a higher coefficient of friction with the sheave groove wall. This creates less slip when the belts are properly tensioned.

Raw edge belts directly replace wrapped belts (BX48 replaces B48).Raw edge belts transmit more Hp than the equivalent wrapped belts.Raw edge belts provide better sheave groove wall contact than wrapped belts, even when used with smaller diameter sheaves.Slide28

Energy Loss from Worn Sheaves

“As a sheave wears, the belt fits more loosely in the groove, so loads don’t transmit as well. This causes an uneven load distribution across the belt tension member, with more load being applied at the belt edges. The effect is similar to that of high temperature. Because of this uneven loading, worn sheaves reduce belt life by as much as 50%. But their adverse effect on efficiency is even more costly. The efficiency of a belt drive with visibly worn sheaves and loose, slipping belts can easily drop below 90%. To translate this into operating costs, consider a 50-hp belt-driven machine that costs $25,150 (at $0.07/kWh) to operate year-round. The efficiency loss due to loose, slipping belts and worn sheaves costs about $1,300 per year, more than enough to replace the belts and sheaves several times”. Power Transmission Design – June 1995 Neville W. Sachs, Salvaterra & Associates Check for groove wear 1/32 “

Worn sheaves cause more load on the end cords – and more rapid failure

Sheave Groove WearSlide29

Span = 32”

How to correctly tension

a belt

If belt span is 32” then a

properly tensioned new V-belt

should only deflect ½ inch when 8.0 lbs. of

force

is applied

.

Deflection

calculated: Span/64 in this example 32/64 = .5 or ½”

If deflection is greater than ½ inch, more

tension must

be

applied by adjusting the motor base. Each drive is unique.Move sheaves as close as possible to the bearings.Reducing the overhung load &stresses on the bearings

+

Motor

Blower

8.0

lbs.Slide30

Energy Saving Program Part II

Drive RetrofittingSlide31

Gather DataSlide32

Retrofit Project:50 HP Supply Fan

Existing Drive:

4 Groove C128 belt drive Redesign: 2 Groove 5VX1400 v-belt driveEnergy Savings: = Over $1300 per year Solution: Expensive MVP Sheave on the motor & Companion Sheave on the Blower ALMOST 90% less than Existing Drive

Motor Sheave Cost: $2,276

Fan Sheave Cost: 1,113

Large Commercial Property

Management Company

Total Sheave Cost: $3,390

Total Sheave Cost for Retro Fit: $ 350

3 ½ Month - ROISlide33

Retrofit Project –50 HP Supply Fan Cost Savings Example

$959

per year in Energy Savings, using DOE 3% calculations$2000 Sheave Replacement Cost Savings, comparing existing drive to new driveExtend Belt PM Cycle from 12 months to 30+ months, annual belt cost alone is $340 – not including labor cost and time.Existing (4) C120 Belt Drive New (2) 5VX1250 Belt Drive Slide34

What can be done to optimize drive life?

Properly tension belts.

Use a tool for consistency and accuracy.Don’t use the “Rule of Thumb”.Check sheave for wear on a regular basis & replace worn sheaves.Always replace the existing belt with like or higher design. Upgrading belt design may even improve drive life.Make sure the drive in properly tensioned.Slide35

Sustaining Drive EfficiencySlide36

Promotes greater efficiency.

Compensates for variations in load

Compensation is obtained by combination of a one-piece movable carriage acted upon by a spring contained within the carriageCarriage design promotes superior alignment

Auto Tensioning Motor Bases

Spring Controlled ActionSlide37

OfferingSlide38

EFFICIENT LUBRICATION

One GoldPlex

™-SPL (EM) Can Service up to 8 Bearings

UNIT CONSTRUCTION

High Strength Polymer Design

GREASE CAPACITY

125 cc or 250cc

UNIT INSPECTION

Clear Top for Quick and Easy Inspection

CORROSION RESISTANCE

GoldPlex-SPL (V) Unit Is Supplied With Clear Plastic Cover to Protect Variable Control Pad

GREASE TYPE

Factory Filled with SealMaster GoldPlex

™-HP Grease

VARIABLE CONTROL PAD

Control Pad Allows for Variable Lubricant Dispensing

No Need for Activator Keys or Control Rings

SealMaster

GoldPlex

-SPL-EM

FEATURES & BENEFITS

OPERATING RANGESlide39

(1) Replacement Grease Pouch 125cc or 250cc

(1) Battery Pack

(1) Disposable Dust Cover

Using Divider Blocks, One SPL-EM Lubricator Can Be Installed to Service up to 8 Ball or Roller Bearings. Consult PPP-04 Catalog Installation Kit Selection.

REPLACEABLE SERVICE PACK

MULTI-BEARING CAPABILITY

Unlike the V Unit, The GoldPlex-SPL-EM Model Allows for Fresh Lubricant to Be Added when Unit Grease Bladder Has Been Depleted.

SPL-EM

Divider Block

Accessories – (V Unit Installation Kit)Slide40

Tools & Available ResourcesSlide41

Browning V-Belt Energy Efficiency Calculation I-Phone App

Viral Campaign with Facebook page and LinkedIn promotions

Magazine Ad Campaign centered around App Release committed

Compatible with I-Touch and I-PadSlide42

Belt Efficiency Calculator APPSlide43

Browning Toolbox Technician APPWhere to Find FunctionSlide44

Connect With Us

Visit our Facebook page @BrowningBeltDrives 

Search Browning Belt Drives Save the Green. Join in on our belt drive conversations for energy savings and benefits.Visit our website for: Application Engineering contact information, installation instructions, product interchange software www.emerson-ept.com.

Download the Browning Energy Efficiency Calculator for your iPhone

® or

Droid

®.

Search “Browning vbelts”

ThePowerTransmission

for the latest product videos and trade show clips about Emerson Browning brand belt drive products and online tools. Slide45

Any Questions?Slide46

Contact Information