Type of Gears - Internal Gear
Video
An internal gear, also known as a ring gear, has teeth on the inside of a cylindrical ring and meshes with an external gear, typically a pinion. These gears are used in applications like planetary gear systems, automatic transmissions, and robotics to provide high speed reduction, torque increase, and compact designs. They are stronger and more efficient than external gears and allow for a change in velocity without a change in direction
 
Advantages:
  • Low maintenance: Gears are sealed inside a hub, protecting them from dirt, water, and grime, which means less cleaning and lubrication.
  • Durability: They are more resistant to damage from impacts or crashes since the delicate parts are enclosed.
  • Shift while stationary: You can shift gears even when not pedaling, which is convenient for stopping at traffic lights.
  • Longer chain life: The single-speed drivetrain results in longer-lasting chains compared to external systems with multiple sprockets.
    Clean look: The system is cleaner and more aesthetically streamlined.
Disadvantages
  • Weight: They are generally heavier than external derailleur systems.
  • Efficiency: While some gears can be more efficient, others may have slight efficiency losses compared to derailleur systems.
  • Cost: They often have a higher upfront cost.
  • Repair complexity: Repairs can be more complex, requiring specialized tools and knowledge, and are often more expensive.
  • Limited gear range: Some systems have a more limited gear range compared to the wide range available with derailleurs.
  • Wheel removal: Many systems make it difficult to quickly remove or replace the rear wheel.
Materials and applications
  • Materials: They are made from various materials, including plastic (like acetal or nylon) and metals (like aluminum, brass, and stainless steel)
  • Applications: They are widely used in industries such as automotive, manufacturing, and consumer electronics.
    Plastic gears: These are lightweight, non-rusting, and can operate without lubrication, making them suitable for food production and medical equipment.
  • Metal gears: These offer greater strength, load-carrying capacity, and heat resistance.