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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. A further advantage of a leaf spring over a helical spring is that the end of the leaf spring may be guided along a definite path.
A beam axle's location in the fore and aft directions is constrained by one of several suspension components, including trailing arms, semi-trailing arms, radius rods, and leaf springs. The lateral location can be constrained by a Panhard rod, a Scott Russell linkage, a Watt's linkage, or some other arrangement, most commonly by the leaf springs.
Suspension is the system of tires, tire air, springs, shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two. [1] Suspension systems must support both road holding/ handling and ride quality , [ 2 ] which are at odds with each other.
The original PLS had a pair of rigid AxleTech front axles, these with leaf springs. Tires are Michelin 1600R 20. Current fit is Michelin XZL, earlier PLS were fitted Michelin XL. A central tire inflation system (CTIS) is fitted, this having four settings - HWY (highway) • CC (cross-country) • MSS (mud sand snow) • EMERG (emergency). A ...
Leaf springs offer exceptional articulation, a large payload and can take a substantial amount of abuse. [citation needed] With the correct methods they can be modified to help a vehicle carry more weight, have better articulation or to fit large oversized tires. Some vehicles may be equipped with front and rear leaf springs or just rear leaf ...
A ladder frame with three beam axles, the front on leaf springs, the rear tandem on leaf springs with locating arms, was used. The M939 series uses 11:00 R20 tires with two tires per side per axle in the rear (rear tandem duals). This allows a heavy load to be carried on improved roads and most US trucks in the past have used them.