Which type of gears are used for reverse in most transaxles?

The correct answer is that most transaxles use spur gears for reverse. This is primarily due to the simplicity and effectiveness of spur gears in achieving a straightforward directional change. Spur gears have teeth that are parallel to the axis of rotation, allowing for efficient power transmission with minimal sliding friction. This makes them particularly suitable for reverse applications, where direct engagement is beneficial for enhancing reliability and strength.

In the context of transaxles, switching to reverse requires a gear arrangement that is both robust and uncomplicated. Spur gears fulfill these criteria well. They are easy to manufacture and align, which contributes to their prevalence in vehicle transmissions. Additionally, the straightforward design aids in maintaining a compact form factor within the transaxle.

This choice reflects a balance between performance, manufacturing practicality, and the mechanical requirements of the vehicle. Other types of gears, like helical-cut and bevel gears, are often used in different applications due to their unique characteristics but do not provide the same advantages for reverse operations as spur gears do.