Chassis

A chassis (US: /ˈtʃæsi/,[1] UK: /ˈʃæsi/;[2] plural chassis /-iz/ from French châssis fr), is the load-bearing framework of a manufactured 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.

## Contents

* 1 Examples
* 1.1 Vehicles
* 1.2 Electronics
* 1.3 Firearms
* 2 See also
* 3 References
* 4 External links

## Examples

### Vehicles

See also: Rolling chassis and Vehicle frame

Motor vehicle chassis with its suspension, exhaust system, and steering box

In the case of vehicles, the term rolling chassis means the frame plus the "running gear" like engine, transmission, drive shaft, differential, and suspension. The "rolling chassis" description originated from assembly production when an integrated chassis "rolled on its own tires" just before truck bodies were bolted to the frames near the end of the line.[3] An underbody (sometimes referred to as "coachwork"), which is usually not necessary for the 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.[4] A car chassis will be different from one for commercial vehicles because of the heavier loads and constant work use.[5] 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.[6]

An armoured fighting vehicle's hull[7] 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

Main article: Engineering:Computer case

An ATX computer case

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.[8]

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

See also: Engineering:Rifle bedding

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

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 as well as gained increasing popularity as these types of chassis can be expanded to accommodate customizable "furniture" (buttstock, pistol grip, etc.) and rail interface systems that provide mounting points for various accessories.

## See also

* Airframe
* Backbone chassis
* Body-on-frame
* Bogie
* Coachbuilder
* Locomotive frame
* Monocoque, construction from a structural shell instead of a structural frame
* Undercarriage (disambiguation)
* Underframe

## References

1. ↑ "The American Heritage Dictionary entry: chassis". Houghton Mifflin Harcourt Publishing. https://www.ahdictionary.com/word/search.html?q=chassis.
2. ↑ "Chassis definition and meaning". Collins English Dictionary. http://www.collinsdictionary.com/dictionary/english/chassis.
3. ↑ Klier, Thomas H.; Rubenstein, James M. (2008). Who Really Made Your Car?: Restructuring and Geographic Change in the Auto Industry. W.E. Upjohn Institute. p. 273. ISBN 9780880993333. https://books.google.com/books?id=ERZMbFjLM2UC&dq=Rolling+chassis+jeep&pg=PA273. Retrieved April 7, 2023.
4. ↑ Association of Licensed Automobile Manufacturers (U.S.) (1922). Official Handbook of Automobiles. National Automobile Association. p. 180. OCLC 6360726. https://books.google.com/books?id=pjRuEBUi9f0C&q=NACC+definition+of+standard+chassis+commercial&pg=PA180. Retrieved 10 September 2010.
5. ↑ Sturmey, Henry (2 April 1908). "The Use of Unsuitable Vehicles". Commercial Motor 7 (160): 146–147. https://books.google.com/books?id=8oDnAAAAMAAJ&q=Chassis+only+commercial+vehicle&pg=PA146. Retrieved 10 September 2010.
6. ↑ 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 9780309088213. https://books.google.com/books?id=BdzIVGZASxAC&q=cowl+and+chassis+commercial+vehicle&pg=PA13. Retrieved 10 September 2010.
7. ↑ Starry p. 45, 79, 129, 143, 153, etc.
8. ↑ Khandpur, Raghbir Singh (2006). Troubleshooting Electronic Equipment. McGraw-Hill Professional. p. 45. ISBN 9780071477314. https://books.google.com/books?id=vzynnyINF20C&q=electronic+chassis&pg=PA45. Retrieved 10 September 2010.

* Starry, Donn A. (2002). "Mounted Combat in Vietnam (Vietnam Studies)". Department of the Army. Washington, D.C.. https://history.army.mil/html/books/090/90-17-1/CMH_Pub_90-17-1.pdf.

## External links

* v
* t
* e

Chassis control system

Part of the Automobile series

Suspension|

* Anti-roll bar (sway bar)
* Axle
* Axle track
* Beam axle
* Camber angle
* Car handling
* Coil spring
* De Dion tube
* Double wishbone
* Hydrolastic (Hydragas)
* Hydropneumatic
* Independent suspension
* Leaf spring
* Live axle
* MacPherson strut
* Multi-link suspension
* Panhard rod
* Shock absorber
* Swing axle
* Toe angle
* Torsion bar
* Trailing arm
* Unsprung mass
* Watt's linkage
* Wheel alignment
* Wheelbase

Steering|

* Ackermann steering geometry
* Caster angle
* Kingpin
* Oversteer
* Power steering
* Rack and pinion
* Torque steering
* Understeer

Brakes|

* Automatic braking
* Anti-lock braking system
* Active rollover protection
* Brake bleeding
* Brake fade
* Brake fluid
* Brake lining
* Disc brake
* Drum brake
* Electric park brake
* Electronic brakeforce distribution
* Electronic stability control
* Engine braking
* Hydraulic brake
* Hydraulic fluid
* Inboard brake
* Parking brake
* Regenerative brake
* Vacuum servo

Roadwheels
Tires (Tyres)

* Alloy wheel
* Custom wheel
* Drive wheel
* Hubcap
* Outline of tires
* Rostyle wheel
* Spinner
* Whitewall tire
* Wire wheels

* Portal
* Category

* v
* t
* e

Automotive design

Part of a series of articles on cars

Body|

| Framework|

* Backbone chassis
* Beltline
* Body-on-frame
* Bumper
* Cabrio coach
* Chassis
* Continental tire
* Crumple zone
* Dagmar bumpers
* Fender
* Fender skirts
* Grille
* Hood
* Hood scoop
* Monocoque
* Overhang
* Pillar
* Platform
* Pontoon fenders
* Quarter panel
* Roof rack
* Shaker scoop
* Spoiler
* Stressed member engine
* Subframe
* Tonneau
* Trunk lid

|

Compartments|

* Trunk/boot/dickie
* Hood/bonnet

Doors|

* Butterfly
* Canopy
* Gull-wing
* Scissor
* Sliding
* Suicide

Glass|

* Greenhouse
* Power window
* Quarter glass
* Opera window
* Sunroof
* Windshield/windscreen
* Windshield/windscreen wiper

Other elements|

* Bumper sticker
* Curb feeler
* Front-end bra
* Hood ornament
* Japan black
* Nerf bar
* Omniview technology
* Run-flat tire
* Spare tire
* Tire/tyre
* Tow hitch
* Truck accessory
* Window deflector

Geometry|

* Approach and departure angles
* Breakover angle
* Overhang
* Ride height
* Roll center
* Turning radius
* Weight distribution

Exterior
equipment

| Lighting|

* Daytime running lamp
* Headlamp
* sealed beam
* high-intensity discharge lamp
* Hidden headlamps
* Turn signals
* trafficators
* Rear position lamps
* Stop lamps
* Reversing lamps
* Safety reflector
* retroreflector

|

Other elements|

* Horn
* Registration plate
* vanity plate
* Windshield/windscreen washer fluid
* Wing mirror
* power side-view mirror

Legal|

* Identification number
* Theft

* Category
* Commons
* Portal

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