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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.
The axle receives its vertical and transverse support from a transverse leaf spring (leaf springs were often used for support in more than one direction), and its longitudinal support from fore-aft links sometimes called "radius rods" which are attached (via pivots) to the ends of the axle at their forward end and to the sides of the chassis ...
The AC Cobra is an example of a transverse, multi-leaf steel spring suspension that uses the leaf spring as the upper suspension arm. Alternatively, the 1963 Corvette's rear suspension is an example where the transverse leaf spring is used only as a ride spring. In both examples, the leaf spring is centrally mounted, preventing displacement of ...
At the center, the leaf spring is supported on the axle. Multi-leaf springs are provided with one or two extra full-length leaves in addition to the master leaf and the graduated length leaves. The extra full-length leaves are provided to support the transverse sheer force. A multi spring is not just a bunch of pieces of steel put together. It ...
A radius rod (also called a radius arm, torque arm, torque spring, and torsion bar) is a suspension link intended to control wheel motion in the longitudinal (fore-aft) direction. The link is connected (with a rubber or solid bushing ) on one end to the wheel carrier or axle , on the other to the chassis or unibody of the vehicle.
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.
This is an especially severe problem when a swing axle is used in a rear-engine design, because of the greater side-g forces on the rear wheels from the mass of the engine. Camber changes during deceleration can increase the severity of lift-off oversteer. 1964 Corvair swing-axle rear suspension with transverse leaf spring