What are the two main purposes of rear leaf springs in a vehicle?

The two main purposes of rear leaf springs in a vehicle are to absorb road shock and locate the axle.

Leaf springs are designed to help maintain ride quality by compressing and extending in response to road irregularities, which helps to cushion the impact of bumps and dips. This shock absorption is crucial in providing a smooth ride for passengers and protecting the vehicle's components from damage due to harsh impacts.

In addition to absorbing shocks, leaf springs also play a key role in locating the axle. They help to keep the axle properly aligned under the vehicle, ensuring that the wheels maintain their intended position during operation. This alignment is essential for effective handling, responsive steering, and overall vehicle stability, particularly under load or during cornering.

Together, these functions are critical for the overall performance and comfort of the vehicle, making the absorbing of road shock and axle localization the primary purposes of rear leaf springs.