Basics

This article provides answers to the following questions, among others:

  • How does a belt drive work?
  • What is special about timing belts compared to classic flat belts or V-belts?
  • How does the belt tension and the wrapping of the pulley influence the power transmission?
  • What are tigth side and slack side of a belt?
  • How is the wrap angle defined?
  • What design measures can increase the wrap angle?
  • How does the wrap angle change under load?
  • How can belts be kept on tension during operation?
  • What are the pro and cons of belt drives compared to other types of transmission?
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Basics of power transmission

This article provides answers to the following questions, among others:

  • What does the belt friction equation state?
  • Under what conditions does the belt friction equation only apply?
  • Why must there also be a force on the slack side of the belt for power transmission?
  • How can the overload protection of belt drives be explained with the belt friction equation?
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Power transmission of a belt drive

This article provides answers to the following questions, among others:

  • What is the relationship between the circumferential force (effective force) and the forces on the tight side and the slack side?
  • How is the circumferential force transmitted?
  • How is the maximum transmittable circumferential force determined?
  • What states the yield?
  • Which friction coefficient and wrap angle is decisive for the maximum transmittable circumferential force?
  • Why do belts have to be pretensioned?
  • How is the minimum necessary pretensioning force determined?
  • What effects do centrifugal forces have on the pretensioning force?
  • How is the pretensioning force measured in practice?
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Centrifugal forces

This article provides answers to the following questions, among others:

  • How do centrifugal forces influence the contact pressure between belt and pulley?
  • How can centrifugal forces be counteracted in later operation?
  • How do centrifugal forces influence the belt forces and the transmitted circumferential force?
  • How is the additional centrifugal preload to compensate for centrifugal forces calculated?
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Maximum belt stress

This article provides answers to the following questions, among others:

  • Which forces or tensions act in the belt?
  • How is the centrifugal tension and the bending stress determined?
  • At what point does the greatest belt stress occur?
  • What is the bending frequency and how is it calculated?
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Optimum belt speed

This article provides answers to the following questions, among others:

  • How is the transmitted power of belt drives determined?
  • What influence does centrifugal force have on the maximum transmittable power?
  • At what optimum belt speed can the maximum power be transmitted?
  • How is the performance determined at optimum belt speed?
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Bearing force

This article provides answers to the following questions, among others:

  • How is the bearing force of belt drives calculated?
  • What is the maximum bearing force for a given pretension?
  • What influence do centrifugal forces have on the bearing forces?
  • How can the preload force be adjusted by the bearing force?
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Slippage

This article provides answers to the following questions, among others:

  • What is meant by slippage in general and by elastic slip sliding slip in particular?
  • Which belt property is responsible for the elastic slip?
  • How does the belt speed change when rotating around the pulleys?
  • How are speed loss and elastic slip related?
  • What effects does the elastic slip have on the power and the circumferential force or torque?
  • How does it come to adhesion and sliding areas between belt and pulley?
  • How is elastic slip calculated for a certain circumferential force?
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Belt types

This article provides answers to the following questions, among others:

  • What are the operating characteristics of a flat belt?
  • What are the pros and cons of V-belts compared to flat belts?
  • What is the difference between wrapped and raw edge V-belts?
  • What is the difference between narrow V-belts and standard V-belts and what are the advantages?
  • Where are wide V-belts (variable speed belts) used?
  • In which cases are double V-belts (hex belts) used?
  • What are the advantages of kraftbands compared to standard V-belts?
  • The advantages of which belt types does the poly V-belt combine?
  • What are round belts mainly used for?
  • What are the advantages of timing belts (synchronous belts) and where are they often used?
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