v-belt basics. means of power transmission v-belts chains gears timing belts

V-Belt Basics

Means of Power Transmission

• V-Belts

• Chains

• Gears

• Timing Belts

V-Belts and V-Belt Drives

The function of a belt is to simply transfer rotation from the powered pulley to one or more driven pulleys. The belt must be designed and manufactured to transfer this torque efficiently and reliably.

V-Belts and V-Belt Drives

•V-Belts have been around since the early 20th century

V-Belts and V-Belt Drives

•V-Belts work using the principle of the ”wedge”

V-Belts and V-Belt Drives

•V-Belts are available in thousands of sizes and configurations

•Primary function is to transmit power from a primary source (motor) to a secondary “driven” unit

V-Belt Characteristics•Less expensive than other forms of power transmission•Start, stop and run smoothly•Operate noiselessly and without lubrication•Absorb objectionable and harmful vibrations•Clean and requires minimum maintenance•Rugged and long lasting•Provide a wide selection of speed ranges•Cover an extremely wide horsepower range•Easy to install and simple to replace•Relatively unaffected by moisture, abrasive dusts, or extreme

variations in temperature

V-Belt Drive Terms

V-Belt Construction

Compression Section

Tension SectionTensile Members

Types of Belts•Classical or Multiple V-Belts•Fractional Horse-Power or Light Duty V-Belts•Narrow or Wedge Multiple V-Belts•Double Angle or Serpentine V-Belts•Banded Belts•V-Ribbed Belts•Variable Speed Belts•Trapezoidal Synchronous or Timing Belts•High Torque Synchronous belts•Specialty Type Belting

•V-Belt - works on the principle of the wedge and relies on tension to create friction on the sidewall of the sheave to transmit power

•Synchronous or timing belt - relies on accurate and smooth meshing of the teeth on the belt with the grooves of the sprocket

Two Major Belt Categories

•Wrapped Molded which has a fabric cover and is molded into a V-shape

•Raw Edge which is cured and then cut into a V-shape

Two Major Types of V-Belts

Wrapped V-Belt Construction

•1. Protective fabric cover impregnated with rubber

•2. Tension Section - synthetic rubber compounded to stretch as belt bends

•3. Cords - synthetic fiber cords carry the power and minimise stretch

•4. Compression Section - synthetic rubber compound to support cords evenly and compress as belt bends

Raw Edge V-Belt Construction

•1. Tension Section - specially woven stress-relived fabric

•2. Cords - synthetic high modulus cord to carry high loads with minimal stretch

•3. Compression Section - Stiflex rubber compound and precision molded cogs increase flexibility and supports cords

•4. Raw Edge Side Walls - provide uniform anti-slip surface, greater flexibility and allow more cord

Advantages Raw Edge vs. Wrapped

•Performs up to 4%more efficiently

•Generates less heatbuild up

•Allows smaller pulley diameters

•Increased power ratings

•Provides longer life

Classical or Multiple V-Belts

Gold Ribbon Cog Belt

Raw Edge ClassicalPremium Product

Super Blue Ribbon

Wrapped Molded ClassicalHighest Volume Belt

Super II V-Belts

Raw Edge Classical Extreme Duty

Fractional HorsepowerLight-Duty V-Belts

Durapower FHPStandard FHP Line

XDV Xtra Duty V-BeltPremium Lawn/Garden Line

Durapower II FHPRaw Edge FHP Line

Narrow or Wedge Multiple Belts

Power Wedge Cog V-BeltsRaw Edge

Increased HP Capability

Super Power Wedge V-BeltsWrapped Molded

Increased HP Capability

Banded Belts

Gold Ribbon Cog-BandRaw Edge

Premium Product

Super Vee-BandWrapped Molded

Standard product

Wedge-Band Cog-Band

Raw EdgeHigher HP

Wedge-Band Wrapped Wrapped Molded

Higher HP

Synchronous Belts

RPP Panther RPP Plus Dual RPP

Synchro-Cog Timing Belt Synchro-Cog Dual Timing Belt

Specialty Belts

Dry Can BeltingDouble Angle V-Belts

Thoro-Twist V-Belts

www.CarlisleBelts.com

www.c-rproducts.comsales@c-rproducts.comTel: +44 1327 701030Fax: +44 1327 701031

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