thumb|right|motor vehicle chassis with its suspension, exhaust system, and steering box a chassis ( or ; plural: "chassis"  or ) consists of an internal framework that supports a man-made object in its construction and use. it is analogous to an animal's skeleton. an example of a chassis is the underpart of a motor vehicle, consisting of the frame (on which the body is mounted). if the running gear such as wheels and transmission, and sometimes even the driver's seat, are included then the assembly is described as a rolling chassis. == examples of use == === vehicles ===   in the case of vehicles, the term rolling chassis means the frame plus the "running gear" like engine, transmission, driveshaft, differential, and suspension. a body (sometimes referred to as "coachwork"), which is usually not necessary for integrity of the structure, is built on the chassis to complete the vehicle. for commercial vehicles a rolling chassis consists of an assembly of all the essential parts of a truck (without the body) to be ready for operation on the road. the design of a pleasure car chassis will be different than one for commercial vehicles because of the heavier loads and constant work use. commercial vehicle manufacturers sell âchassis onlyâ, âcowl and chassisâ, as well as "chassis cab" versions that can be outfitted with specialized bodies. these include motor homes, fire engines, ambulances, box trucks, etc. in particular applications, such as school buses, a government agency like national highway traffic safety administration (nhtsa) in the u.s. defines the design stand
Automotive_chassis_types Carriages_and_mountings Computer_enclosure Vehicle_technology