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(1) In reference to a motor vehicle or a tractor, a chassis is the aggregate of assemblies comprising the power train, the undercarriage (or running gear), and the control mechanisms. In a motor vehicle with a load-carrying (frameless, or unitized) body, the bottom of the body is considered part of the chassis, and the above-mentioned assemblies are fastened to it. In a vehicle with a frame, the chassis is the structure that, when completed, can move on its own wheels or tracks. The frame-type chassis is used mainly in tractors and trucks; its configuration depends on whether wheels or tracks are used. For wheeled vehicles, the design of the chassis is determined by the vehicle’s total number of axles and the number of driving axles. The chassis of some vehicles are equipped for off-road travel.
(2) The chassis of a device such as a radio, computer assembly, or rectifier is the panel on which the individual parts are mounted. The chassis is usually made of sheet material, such as aluminum, brass, Micarta, or textolite.
S. IA. MAKAROV [29–873 -6]