Classification of Gear Trains
A gear train is two or more gear working together by meshing their teeth and turning each other in a system to generate power and speed
- It reduces speed and increases torque
- Electric motors are used with the gear systems to reduce the speed and increase the torque
Types of Gear trains
- Simple gear train
- Compound gear train
- Planetary gear train
1. Simple Gear Train
- The most common of the gear train is the gear pair connecting parallel shafts. The teeth of this type can be spur, helical or herringbone.
- Only one gear may rotate about a single axis
2. Compound Gear trains
- For large velocities, compound arrangement is preferred
- When there are more than one gear on a shaft,it is called a compound gear trains.
- Two or more gears may rotate about a single axis
3.Planetary Gear trains
Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear.
- They have higher gear ratios.
- They are popular for automatic transmissions in automobiles.
- They are also used in bicycles for controlling power of pedaling automatically or manually.
- They are also used for power train between internal combustion engine and an electric motor.