A Leaf spring is a spring type, usually it has been used in vehicles but nowadays current type is not so popular. Using leaf spring is one of the oldest ways to make suspension.
Leaf Spring Media
A traditional semi-elliptical Hotchkiss leaf spring arrangement. On the left, the spring is connected to the frame through a shackle.
Generic diagram of a leaf spring pack, without eyes; leaves are fastened together by the centre bolt, midway along the length of the spring, and lateral alignment is enforced by multiple clips
Each side of this rear axle is suspended by a leaf spring. The front eye of each leaf spring is secured to the frame; the rear eye is attached by a shackle that pivots to allow the spring to lengthen as it flexes.
Three-quarter-elliptic leaf spring on a carriage.
Tapered or parabolic leaf spring diagram
17th-century coach spring in Lisbon Carriage Museum