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14995-A 8/99

The world’s most trusted name in belts, hose and hydraulics.

Heavy Duty V-Belt Drive Design Manual

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Preface
This manual includes tables, specifications and procedures necessary to design drives using the following Gates Heavy Duty Industrial Belts: • Super HC® V-Belts and Super HC PowerBand® Belts • Super HC Molded Notch V-Belts and Super HC Molded Notch PowerBand Belts • Hi-Power® II V-Belts and Hi-Power II PowerBand Belts • Tri-Power® Molded Notch V-Belts • Micro-V® Belts •Polyflex® JB® Included are sections on special drives such as: • Speedup • V-Flat • Idler • Quarter-Turn • Variable Pitch V-Belt There also is a large section on engineering information related to V-Belt drives. NOTE: This manual reflects a recent change in the industry standard for classical V-Belts and Sheaves — a move from the “Pitch” System to the recently adopted “Datum” System. For more detailson this change, see Page 219. If you have questions or suggestions concerning data in this manual, contact your local Gates representative or write to: Power Transmission Division V-Belt Product Application The Gates Rubber Company 900 South Broadway • P.O. Box 5887 Denver, Colorado 80217-5887

IMPORTANT Gates recommends only those applications of products specified in Gates product literature.Gates disclaims any liability for use of its products in applications other than those for which they were designed.

WARNING! Be safe! Do not use Gates Belts, pulleys or sprockets on aircraft propeller or rotor drive systems or in-flight accessory drives. Gates products are not designed or intended for aircraft use.

Copyright 1999 The Gates Rubber Company Denver, Colorado

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Printed in U.S. of America

Table of Contents
Description Page Description Page

Product Features Belt Features and Size Listings. . . . . . . . . . . . . . . 2-13 Stock Drive Selection How to Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-18 Service Factor Table . . . . . . . . . . . . . . . . . . . . . . 14 Cross Section Selection Charts. . . . . . . .. . . . . 15-17 NEMA Minimum Sheave Diameters . . . . . . . . . . . . 19 Drive Selection Examples . . . . . . . . . . . . . . . . . . . 20, 21 Selection Tables — Super HC® and Super HC Molded Notch PowerBand® Belt Drives Center Distance and Belt Length. . . . . . . . . . 22-69 Horsepower Rating Tables . . . . . . . . . . . . . . 70-74 Selection Tables — Hi-Power® II, PowerBand and Tri-Power®Molded Notch V-Belts Center Distance and Belt Length. . . . . . . . . 76-125 Horsepower Rating Tables . . . . . . . . . . . . . 126-132 Selection Tables — Polyflex® JB® Belts Polyflex® Product Information . . . . . . . . . . . 196-200 Center Distance and Belt Length. . . . . . . . . 134-151 Horsepower Rating Tables . . . . . . . . . . . . . 152-154 Polyflex JB Length Correction Factors . . . . . . 155Selection Tables — Micro V® Belts Center Distance and Belt Length. . . . . . . . . 156-189 Horsepower Rating Tables . . . . . . . . . . . . . 190-192 Installation and Takeup Allowances . . . . . . . . . . 193-194 Belt Matching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 Drive Design Nonstock Drive Selection Procedure . . . . . . . . . 201-209 Drive Selection Examples . . . . . .. . . . . . . . . . . . 210-211 Tensioning How to Tension V-Belt Drives . . . . . . . . . . . . . . . 212-215 Tensioning Example . . . . . . . . . . . . . . . . . . . . . . . . 216

Sheaves and Bushings Types Available . . . . . . . . . . . . . . . . . . . . . . . . . . 217-218 Datum System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 Groove Dimensions . . . . . . . . . . . . ....
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