Puolipääakselit

Puolipääakselit, also known as half-shafts or drive shafts, are essential components in many vehicles, particularly those with rear-wheel drive or all-wheel drive systems. They are responsible for transmitting rotational power from the differential to the wheels. Essentially, they are rigid shafts that connect the differential's output gears to the wheel hubs. The term "puolipääakseli" literally translates to "half-axle" in Finnish, indicating their role as a partial connection in the drivetrain.

These shafts are typically made of strong steel to withstand the torque and stress they endure. They often incorporate universal joints, or CV joints (Constant Velocity joints), at one or both ends. These joints allow for changes in angle and length as the suspension moves and the wheels turn, ensuring smooth power delivery regardless of the wheel's position. Without these flexible joints, the drivetrain would be subjected to excessive strain and potential damage.

In front-wheel-drive vehicles, the term "vetoakseli" (drive axle) is more commonly used for the entire assembly that includes the puolipääakseli, CV joints, and sometimes the hub. However, the puolipääakseli itself is the core component transferring power. Understanding their function is key to comprehending how a vehicle's wheels are driven.