There were a variety of leaf spring types, usually employing the word "elliptical". "Elliptical" or "full elliptical" leaf springs referred to two circular arcs linked at their tips. This was joined to the frame at the top center of the upper arc, the bottom center was joined to the "live" suspension components, such as a solid front axle. Additional suspension components, such as trailing arms, would be needed for this design, but not for "semi-elliptical" leaf springs as used in the Hotchkiss drive. That employed the lower arc, hence its name. "Quarter-elliptic" springs often had the thickest part of the stack of leaves stuck into the rear end of the side pieces of a short ladder frame, with the free end attached to the differential, as in the Austin Seven of the 1920s. As an example of non-elliptic leaf springs, the Ford Model T had multiple leaf springs over its differential that were curved in the shape of a yoke. As a substitute for dampers (shock absorbers), some manufacturers laid non-metallic sheets in between the metal leaves, such as wood.
Leaf spring was very common on automobiles, right up to the 1970s in Europe and Japan and late 70's in America when the move to front wheel drive, and more sophisticated suspension designs saw automobile manufacturers use coil springs instead. Today leaf springs are still used in heavy commercial vehicles such as vans and trucks, SUVs, and railway carriages. For heavy vehicles, they have the advantage of spreading the load more widely over the vehicle's chassis, whereas coil springs transfer it to a single point. Unlike coil springs, leaf springs also locate the rear axle, eliminating the need for trailing arms and a Panhard rod, thereby saving cost and weight in a simple live axle rear suspension.
It sometimes referred to as semi-elliptical, cart, or laminated springs. The center of this arc-shaped spring is usually attached to the axle of the vehicle it supports, while the ends of the spring are attached to the frame itself. In some cases, a leaf spring may be attached to the vehicle frame on one end and the other end will be attached to a short swinging arm known as a shackle. This type of spring configuration often helps to provide a softer, less rigid suspension system. Some automobile manufacturers have recently developed a leaf spring that is constructed of a composite material similar to plastic in order to provide a softer type of rear suspension.
Informative and the idea is direct to the point. Only one more thing to accomplish: finding the right coil springs for your car.
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