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Originally called a laminated or carriage spring, and sometimes referred to as a semi-elliptical spring, elliptical spring, or cart spring, it is one of the oldest forms of vehicle suspension. A leaf spring is one or more narrow, arc-shaped, thin plates that are attached to the axle and chassis in a way that allows the leaf spring to flex ...
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.
Retaining the earlier mentioned 18.330 as an example, this is a two-axle all-wheel drive truck (4×4) with leaf spring suspension front and rear (BB; B = Blattfederung/leaf suspension). In the case of tractor trucks, an additional S (BBS) denotes tractor truck configuration (S = Sattelzugmaschinen/tractor unit). [7] [9]
Leaf springs have been around since the early Egyptians. Ancient military engineers used leaf springs in the form of bows to power their siege engines, with little success at first. The use of leaf springs in catapults was later refined and made to work years later. Springs were not only made of metal; a sturdy tree branch could be used as a ...
A ladder frame with three live beam axles, the front on leaf springs, the rear tandem on leaf springs with locating arms. Brakes on the M39 and M809 were air over hydraulic with drum brakes on all wheels, M939s were full air. Many trucks were available with a front-mounted 20,000 lb (9,100 kg) capacity winch. [25] [26] [27]
The M39 series 5-ton 6×6 truck was a family of heavy tactical trucks built for the United States Armed Forces. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather.
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