4-11-2011

# 4-11-2011 - Belts and Chains Functions Amplify torque and...

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DESIGN OF ENGINEERING SYSTEMS I April 11, 2011 Functions Amplify torque and reduce speed max speed ratio: 3.5:1 Gear: ratio, Belt: high speed/low torque Chain: Low speed/high torque Transfer torque from driver to driven Belt: high speed/low torque Chain: Low speed/high torque Span large distances Belts and Chains

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DESIGN OF ENGINEERING SYSTEMS I April 11, 2011 Pros and Cons Flexibility: reduces speed of the motor to the desired speed of the application. Noise: quieter than chain Cost: cheaper than gear and chain drives Work well at high speeds Belt creep Flat Belts V Belts Toothed Belts Belts: Types of Belts
DESIGN OF ENGINEERING SYSTEMS I April 11, 2011 Characteristics: cross section: rectangular Belt creep ° ± , ° ² the tight and slack side belt tensions f is the coefficient of friction (P749) and ³ is the angle of contact with the pulley Centrifugal force acting on the belt , m’ is the mass per unit length Flat Belt Slack side Tight side ° ± ² = ´ µ¶ 22 ' c F m r ± − °?)/(° ² − °?) = ´ µ¶

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DESIGN OF ENGINEERING SYSTEMS I April 11, 2011 Characteristics: cross section: V-shape Pitch diameter V Belt The groove semi-angle β lies usually in the range 17 o ≤ β ≤ 19 o
DESIGN OF ENGINEERING SYSTEMS I April 11, 2011 Geometry of V Belt d D n n d D 2 1 2 1 2 1 2 2 2 1 dn Dn Belt length: 22 1 4 ( ) ( ) 2 ls L C D d D d  1 1 2sin ( ) 2 ( ) 2 s l Dd C and C   

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DESIGN OF ENGINEERING SYSTEMS I April 11, 2011 Kinetics of V Belt T= (F 1 -F 2 ).r 1 2 F e F  12 ( ) / 2 i F F F  Initial Tension 22 ' c F m r 1 2 c c FF e ' () sin
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4-11-2011 - Belts and Chains Functions Amplify torque and...

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