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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 is a hypocycloid or an epicycloid?Under...

### 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 the rotary vanes designed for Roots-type...

### 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...

### 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...

### 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...

### 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,...

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### 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...

### 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...

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### 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 (freewheel) work?Why do a total of...

### 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? Willis equation The speed conversion of planetary gearboxes are...

### 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 symmetrically arranged?What are the transmission ratios...

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### 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 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...

### 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...

### 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

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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...

### 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...

### 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...

### 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...

### 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...

### 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...

### 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...

### 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...

### 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...

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