powertrain

Imagine a car moving down the highway. What is actually making it go? The powertrain is the group of main parts that create power and send it to the wheels. It is not only the engine. It also includes parts like the transmission and other connected parts that help turn power into motion. People usually use this word for cars, trucks, buses, and similar road vehicles. You might hear about "powertrain problems" at a repair shop or "hybrid powertrains" when people talk about cars that use both a gas engine and an electric motor.

The powertrain is the group of parts in a vehicle that make power and deliver it to the drive wheels so the vehicle can move. It is more than just the engine. In a typical car or truck, it usually includes the engine or motor, the transmission, and other related parts such as the driveshaft, differential, and axle system that help transfer power to the wheels.

The exact list of parts can change depending on the kind of vehicle. In a gasoline or diesel vehicle, the system centers on the engine and transmission. In a hybrid, it may also include one or more electric motors and the systems that work with them. In an electric vehicle, people still use the word for the main system that sends power from the battery and motor to the wheels.

The word is used most often for road vehicles. Sometimes people use it more broadly for other machines, but that is less common and depends on the context.

Engineers often talk about improving the powertrain to get better fuel economy, lower emissions, smoother performance, or more power. So when someone mentions a vehicle's powertrain, they usually mean the full system that turns stored energy into movement on the road.