A planet carrier is a component in a mechanical system, often found in vehicles like cars and trucks. It is responsible for holding and supporting the gears that transfer power from the engine to the wheels. This part plays a crucial role in the vehicle's transmission system, ensuring smooth operation and efficient power delivery. In many cases, the planet carrier is part of a planetary gear system, which includes other components like the sun gear and ring gear. This arrangement allows for various gear ratios, enabling the vehicle to adapt to different speeds and loads while maintaining optimal performance.