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Mechanical power transmission

Geometry of cycloidal gears

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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...

Roots type blower (supercharger)

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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...

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...

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...

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...

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...

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...

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...

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...

How does a differential gear work?

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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.

How does a three-speed gear hub work?

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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...

Fundamental equation of planetary gears (Willis equation)

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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?

From stationary gear to planetary gear

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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...

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.

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?

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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.

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...

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...