Cylindrical gears

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

  • What are the pro and cons of internal gears compared to external gears?
  • What are spur gears?
  • Why can a toothed rack also be considered as a spur gear?
  • Why are most gears straight-cut gears?
  • What are pro and cons of helical gears compared to spur-toothed gears?
  • In which cases are herringbone gears used and what is its advantage over helical gears?
  • Why are double helical gears often used instead of herringbone gearing?
  • What are screw gears and what are they used for?
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Bevel gears

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

  • How are bevel gears constructed?
  • What are the advantages of bevel gears compared to cylindrical gears?
  • What is a pinion and a ring gear?
  • What are the advantages of a spiral tooth line compared to straight-cut toothing?
  • What are hypoid gears?
  • What are the advantages of hypoid gears compared to “normal” bevel gears and where are they used?
  • Why do hypoid gears need special lubrication?
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Worms and worm gears

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

  • How are worm drives designed?
  • What types of worms and worm gears exist?
  • How is the transmission ratio of worm gears determined?
  • What is static and dynamic self-locking und where is it used?
  • What is the connection between self-locking and efficiency?
  • What are the advantages of using multi-start worms?
  • Why should self-locking worm drives not come to a halt immediately after switching off, if large masses are moved with them?
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