Lesson 3/Learning Event 1
FIGURE 26. ELLIPTIC SPRINGS.
More variations of this spring are the semielliptic laminated leaf and the quarter elliptic
laminated leaf.
The semielliptic laminated leaf springs are the most commonly used on modern trucks
and on many passenger cars.
The semielliptic laminated leaf spring consists of several spring leaves of different
lengths, a center bolt, and spring leaf clips. The spring leaves are assembled according to
length, ranging from the shortest at one side to the longest at the other side of the spring.
The center bolt passes through a hole in the spring leaves and is secured with a nut. The
center bolt holds the spring leaves in place, and its head is generally engaged in the
spring seat to assist in axle alignment. The spring leaf clips are fitted around the spring,
and each one is secured with a bolt, spacer, and nut. The clips hold the ends of the leaves
together when the vehicle bounces over rough roads. They are often called rebound clips.
The ends of the first, or main, leaf are often rolled into circles that are called the spring
eyes. A bushing-type bearing is pressed into each spring eye. Usually, this is a smooth
brass or a bronze bushing, but sometimes it may be a rubber or threaded-steel type.
On light trucks, two semielliptic laminated leaf springs are generally used to mount each
axle assembly. The ends of each spring are fastened to the vehicle frame, lengthwise to
the vehicle. The axle assemblies are fastened to the springs at or near their centers. The
springs hold the axle assemblies in alignment with the vehicle frame.
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