Construction of a cycloid (epicycloid and hypocycloid)

Geometry of cycloidal gears

This article provides answers to the following questions, among others: How is the shape of the tooth of a cycloidal gear obtained?How is a cycloid constructed?What is a hypocycloid or an epicycloid?Under...
Roots type supercharger

Roots type blower (supercharger)

This article provides answers to the following questions, among others: What is a Roots-type blower?How does a Roots-type supercharger work?Why are three-lobed rotors usually used?How are the rotary vanes designed for Roots-type...
Manufacturing undercut during hobbing (yellow and red gear)

Undercut

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This article provides answers to the following questions, among others: What is an undercut?How does undercutting occur during gear hobbing?What effects does an undercut have on the load capacity of a gear...
Meshing of a gear with a rack

Rack

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This article provides answers to the following questions, among others: How is the line of action and the line of contact determined for racks?How does the position of the pitch point change...
Line of action

Meshing of involute gears

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This article provides answers to the following questions, among others: What is the line of action of two meshing gears?How is the position of the line of action determined?What is the line...
Definition of involute function

Calculation of involute gears

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This article provides answers to the following questions, among others: center distancetip shorteningsum of the profile shift coefficients to obtain a certain center distanceoperating pressure angletransmission ratiostandard reference pitch circleoperating pitch circletip,...
Gear cutting with a hob (hobbing)

Gear cutting

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This article provides answers to the following questions, among others: How are gears manufactured?What are the advantages and disadvantages of gear hobbing?What are the advantages of gear shaping with a pinion-shaped cutter...
Comparison of profile-shifted gears

Profile shift

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In the case of a profile shift, the reference profile of the gear is shifted outwards in order to positively influence the meshing and the load capacity or to adjust the...
Involute gears

Geometry of involute gears

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Involute toothing is often used in mechanical engineering for gears, as it offers favourable meshing and is easy to produce. Learn more about the geometry of involute gears in this article. This...
5th step - symmetrical arrangement of the bevel gears to avoid bending stresses

How does a differential gear work?

Differential gears in cars ensure that the wheels can rotate at different speeds when cornering. Learn more about how a differential works in this article. This article provides answers to the following...
Carrier of a three-speed gear hub

How does a three-speed gear hub work?

This article provides answers to the following questions, among others: How does a three-speed internal-gear hub work?How are the different gears implemented?How does an overrunning clutch (freewheel) work?Why do a total of...
Velocity distribution on the rotating planet gear with moving carrier

Fundamental equation of planetary gears (Willis equation)

This article provides answers to the following questions, among others: How is the relationship between the individual rotational speeds of the components of planetary gears? Willis equation The speed conversion of planetary gearboxes are...
Planetary gear

From stationary gear to planetary gear

This article provides answers to the following questions, among others: How is a planetary gear unit constructed?How does a planetary gear work?Why are several planetary gears symmetrically arranged?What are the transmission ratios...
Operating principle of a belt drive

Basics

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In belt drives, the power transmission between the pulleys is usually force-locked by flexible belts. More information on the basics of belt drives can be found in this article. This article provides...
Calculation of belt length

Calculation of the belt length

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This article provides answers to the following questions, among others: How can the length of the belt of a single-stage belt drive be calculated? For the construction of belt drives it is necessary...
Power transmission of belt drive

Power transmission of a belt drive

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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...
Addition of the centrifugal forces and the centrifugal belt force

Centrifugal forces

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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...
Stress distribution in the belt in the operating state under load

Maximum belt stress

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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...
Optimum belt speed

Optimum belt speed

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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...
Calculation of the bearing force

Bearing force

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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...
Stretching and shrinking of the belt around the pulleys

Slippage

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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...
Flat belt

Belt types

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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...
Forces acting on a fixed pulley

Basics of power transmission

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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...
Pinion and gear of a bevel gearbox

Bevel gears

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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...
Globoid worm und globoid worm gear (globoid worm drive)

Worms and worm gears

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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...
Straight-cut toothing

Cylindrical gears

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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...
Gearbox housing with oil pan

Lubrication

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This article provides answers to the following questions, among others: Why are steel gears often surface-hardened? What types of lubricants are frequently used? Why do lubricants have to be replaced regularly? How...
Stages of a gear transmission

Gear stages

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A gear stage is a wheel pairing within a gearbox at which the speed or torque changes! Learn more about gear stages in this article. This article provides answers to the following...
Energy flow diagram of a real transmission

Mechanical power

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This article provides answers to the following questions, among others: How is the power physically defined?How is power for translational motions related to force and velocity?How is power for rotary motions related to...
Operation of a gear transmission

Operating principle

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This article provides answers to the following questions, among others: For what purposes are transmissions used?What influence does a transmission have on the incoming and outgoing power?What is a positive-locked or a force-locked...