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Chassis

From Wikipedia, in a visual modern way
For computer chassis, see Computer case.
See also: Locomotive frame, Locomotive bed, Underframe, and Bogie
The CTC-2 chassis of an RCA CT-100 television
The CTC-2 chassis of an RCA CT-100 television

A chassis (US: /ˈtʃæsi/,[1] UK: /ˈʃæsi/;[2] plural chassis /-iz/ from French châssis [ʃɑsi]) is the load-bearing framework of an artificial object, which structurally supports the object in its construction and function. An example of a chassis is a vehicle frame, the underpart of a motor vehicle, 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.

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American English

American English

American English, sometimes called United States English or U.S. English, is the set of varieties of the English language native to the United States. English is the most widely spoken language in the United States and in most circumstances is the de facto common language used in government, education and commerce. Since the 20th century, American English has become the most influential form of English worldwide.

British English

British English

British English is, according to Oxford Dictionaries, "English as used in Great Britain, as distinct from that used elsewhere". More narrowly, it can refer specifically to the English language in England, or, more broadly, to the collective dialects of English throughout the British Isles taken as a single umbrella variety, for instance additionally incorporating Scottish English, Welsh English, and Northern Irish English. Tom McArthur in the Oxford Guide to World English acknowledges that British English shares "all the ambiguities and tensions [with] the word 'British' and as a result can be used and interpreted in two ways, more broadly or more narrowly, within a range of blurring and ambiguity".

Structural load

Structural load

A structural load or structural action is a force, deformation, or acceleration applied to structural elements. A load causes stress, deformation, and displacement in a structure. Structural analysis, a discipline in engineering, analyzes the effects of loads on structures and structural elements. Excess load may cause structural failure, so this should be considered and controlled during the design of a structure. Particular mechanical structures—such as aircraft, satellites, rockets, space stations, ships, and submarines—are subject to their own particular structural loads and actions. Engineers often evaluate structural loads based upon published regulations, contracts, or specifications. Accepted technical standards are used for acceptance testing and inspection.

Vehicle frame

Vehicle frame

A vehicle frame, also historically known as its chassis, is the main supporting structure of a motor vehicle to which all other components are attached, comparable to the skeleton of an organism.

Motor vehicle

Motor vehicle

A motor vehicle, also known as motorized vehicle or automotive vehicle, is a self-propelled land vehicle, commonly wheeled, that does not operate on rails and is used for the transportation of people or cargo.

Rolling chassis

Rolling chassis

A rolling chassis is the fully-assembled chassis of a motor vehicle without its bodywork. It is equipped with running gear and ready for delivery to a coachbuilder to be completed. Historically, bespoke luxury automobiles were finished inside and out to an owner's specifications by a coachbuilder, and specialty vehicles were outfitted by firms devoted to that task.

Examples of use

Motor vehicle chassis with its suspension, exhaust system, and steering box
Motor vehicle chassis with its suspension, exhaust system, and steering box
An ATX computer case.
An ATX computer case.

Vehicles

See also: Rolling chassis and Vehicle frame

In the case of vehicles, the term rolling chassis means the frame plus the "running gear" like engine, transmission, drive shaft, differential and suspension. An underbody (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.[3] A car chassis will be different from one for commercial vehicles because of the heavier loads and constant work use.[4] Commercial vehicle manufacturers sell "chassis only", "cowl and chassis", 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 standards of chassis and body conversions.[5]

An armoured fighting vehicle's hull[6] serves as the chassis and comprises the bottom part of the AFV that includes the tracks, engine, driver's seat, and crew compartment. This describes the lower hull, although common usage might include the upper hull to mean the AFV without the turret. The hull serves as a basis for platforms on tanks, armoured personnel carriers, combat engineering vehicles, etc.

In the intermodal trucking industry, a chassis is a type of semi-trailer onto which a cargo container can be mounted for road transport.

Electronics

In an electronic device (such as a computer), the chassis consists of a frame or other internal supporting structure on which the circuit boards and other electronics are mounted.[7]

In some designs, such as older ENIAC sets, the chassis is mounted inside a heavy, rigid cabinet, while in other designs such as modern computer cases, lightweight covers or panels are attached to the chassis.

The combination of chassis and outer covering is sometimes called an enclosure.

Firearms

The M2010 Enhanced Sniper Rifle, based on the bolt-action Remington 700 design but bedded inside an accurizing chassis.
The M2010 Enhanced Sniper Rifle, based on the bolt-action Remington 700 design but bedded inside an accurizing chassis.
See also: Rifle bedding

In firearms, the chassis is a bedding frame on long guns such as rifles to replace the traditionally wooden stock, for the purpose of better accurizing the gun. The chassis is usually made from hard metallic material such as aluminium alloy (and less frequently stainless steel, titanium alloy or recently magnesium alloy) due to metals having superior stiffness and compressive strength compared with wood or synthetic polymer, which are commonly used in conventional rifle stocks.

The chassis essentially functions as a more extensive pillar bedding, providing a metal-on-metal bearing surface that has reduced shifting potential under the stress of recoil. A barreled action bedded into a metal chassis would theoretically operate more consistently during repeated firing, resulting in better precision. With the increasing availability of CNC machining, chassis have become more affordable and sophisticated, and gained increasing popularity as it can also be expanded to accommodate customizable "furnitures" (buttstock, pistol grip, etc.) and rail interface systems that provide mounting points for various accessories.

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ATX

ATX

ATX is a motherboard and power supply configuration specification, patented by David Dent in 1995 at Intel, to improve on previous de facto standards like the AT design. It was the first major change in desktop computer enclosure, motherboard and power supply design in many years, improving standardization and interchangeability of parts. The specification defines the dimensions; the mounting points; the I/O panel; and the power and connector interfaces among a computer case, a motherboard, and a power supply.

Computer case

Computer case

A computer case, also known as a computer chassis, is the enclosure that contains most of the hardware of a personal computer. The components housed inside the case are referred as the internal hardware, while hardware outside the case are known as peripherals.

Gear

Gear

A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth, which mesh with another (compatible) toothed part to transmit (convert) torque and speed. The basic principle behind the operation of gears is analogous to the basic principle of levers. A gear may also be known informally as a cog. Geared devices can change the speed, torque, and direction of a power source. Gears of different sizes produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. The rotational speeds, and the torques, of two meshing gears differ in proportion to their diameters. The teeth on the two meshing gears all have the same shape.

Engine

Engine

An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.

Drive shaft

Drive shaft

A drive shaft, driveshaft, driving shaft, tailshaft, propeller shaft, or Cardan shaft is a component for transmitting mechanical power and torque and rotation, usually used to connect other components of a drivetrain that cannot be connected directly because of distance or the need to allow for relative movement between them.

Differential (mechanical device)

Differential (mechanical device)

A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Other uses include clocks and analog computers.

Commercial vehicle

Commercial vehicle

A commercial vehicle is any type of motor vehicle used for transporting goods or paying passengers.

Chassis cab

Chassis cab

A chassis cab, also called a cab chassis or half truck, is a type of vehicle construction, often found in medium duty truck commercial vehicles.

Recreational vehicle

Recreational vehicle

A recreational vehicle, often abbreviated as RV, is a motor vehicle or trailer that includes living quarters designed for accommodation. Types of RVs include motorhomes, campervans, coaches, caravans, fifth-wheel trailers, popup campers, and truck campers.

Ambulance

Ambulance

An ambulance is a medically equipped vehicle which transports patients to treatment facilities, such as hospitals. Typically, out-of-hospital medical care is provided to the patient during the transport.

Box truck

Box truck

A box truck—also known as a box van, cube van, bob truck or cube truck—is a chassis cab truck with an enclosed cuboid-shaped cargo area. On most box trucks, the cabin is separate to the cargo area; however some box trucks have a door between the cabin and the cargo area.

National Highway Traffic Safety Administration

National Highway Traffic Safety Administration

The National Highway Traffic Safety Administration is an agency of the U.S. federal government, part of the Department of Transportation. It describes its mission as "Save lives, prevent injuries, reduce vehicle-related crashes" related to transportation safety in the United States.

Source: "Chassis", Wikipedia, Wikimedia Foundation, (2023, February 23rd), https://en.wikipedia.org/wiki/Chassis.

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Further Reading

Armoured fighting vehicle

Monocoque

Strut

Superleggera

Body-on-frame

Coachbuilder

Austin 7

Guy Motors

Leyland Atlantean

Subframe

Guy armoured car

Rhino Heavy Armoured Car

Austin Armoured Car

Vehicle frame

Type 85 AFV

List of recreational vehicles

Rolling chassis

White AM armoured car
See also
Look up chassis in Wiktionary, the free dictionary.
Wikimedia Commons has media related to Chassis.
References
  1. ^ Company, Houghton Mifflin Harcourt Publishing. "The American Heritage Dictionary entry: chassis". www.ahdictionary.com. Retrieved 2017-05-21.
  2. ^ "Chassis definition and meaning | Collins English Dictionary". www.collinsdictionary.com. Retrieved 2017-05-21.
  3. ^ Association of Licensed Automobile Manufacturers (U.S.) (1922). Official Handbook of Automobiles. National Automobile Association. p. 180. OCLC 6360726. Retrieved 10 September 2010.
  4. ^ Sturmey, Henry (2 April 1908). "The Use of Unsuitable Vehicles". Commercial Motor. 7 (160): 146–147. Retrieved 10 September 2010.
  5. ^ Grenzeback, Lance R.; Lin, Sandi; Meunier, Jacob (2005). Operational Differences and Similarities among the Motorcoach, School Bus, and Trucking Industries. Transportation Research Board. p. 13. ISBN 978-0-309-08821-3. Retrieved 10 September 2010.
  6. ^ Starry p. 45, 79, 129, 143, 153, etc.
  7. ^ Khandpur, Raghbir Singh (2006). Troubleshooting Electronic Equipment. McGraw-Hill Professional. p. 45. ISBN 978-0-07-147731-4. Retrieved 10 September 2010.
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