UpdateBot at 08:48, 31 May 2022

2022-05-31T08:48:40Z

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{{short description|Load-bearing framework}}
{{For|computer chassis|Computer case}}
{{See also|Locomotive frame|Locomotive bed|Underframe|Bogie}}
[[File:CT-100 with CTC-2 chassis.JPG|thumb|The CTC-2 chassis of an [[RCA]] [[CT-100]] television]]
A '''chassis''' ({{IPAc-en|US|ˈ|tʃ|æ|s|i}},<ref>{{Cite web|url=https://www.ahdictionary.com/word/search.html?q=chassis|title=The American Heritage Dictionary entry: chassis|last=Company|first=Houghton Mifflin Harcourt Publishing|website=www.ahdictionary.com|access-date=2017-05-21}}</ref> {{IPAc-en|UK|ˈ|ʃ|æ|s|i}};<ref>{{Cite web|url=http://www.collinsdictionary.com/dictionary/english/chassis|title=Chassis definition and meaning {{!}} Collins English Dictionary|website=www.collinsdictionary.com|language=en|access-date=2017-05-21}}</ref> plural ''chassis'' {{IPAc-en|-|i|z}} from French '''châssis''' {{IPA-fr|ʃɑsi|}}) is the [[structural load|load]]-bearing [[structural frame|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]].

==Examples of use==
[[File:Chassis with suspension and exhaust system.jpg|thumb|Motor vehicle chassis with its suspension, exhaust system, and steering box]]
[[File:Gabinete99.jpg|thumb|An [[ATX]] [[computer case]].]]

===Vehicles===
{{See also|Rolling chassis}}
In the case of vehicles, the term ''rolling chassis'' means the [[frame (vehicle)|frame]] plus the "running gear" like [[engine]], [[transmission (mechanics)|transmission]], [[drive shaft]], [[differential (mechanical device)|differential]] and [[suspension (vehicle)|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 vehicle]]s, 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.<ref>{{cite book|title=Official Handbook of Automobiles|year=1922|publisher=National Automobile Association|url=https://books.google.com/books?id=pjRuEBUi9f0C&q=NACC+definition+of+standard+chassis+commercial&pg=PA180|author=Association of Licensed Automobile Manufacturers (U.S.)|access-date=10 September 2010|page=180|oclc=6360726}}</ref> A car chassis will be different from one for commercial vehicles because of the heavier loads and constant work use.<ref>{{cite journal|last=Sturmey|first=Henry|journal=Commercial Motor|title=The Use of Unsuitable Vehicles|volume=7|issue=160|date=2 April 1908|url=https://books.google.com/books?id=8oDnAAAAMAAJ&q=Chassis+only+commercial+vehicle&pg=PA146|access-date=10 September 2010|pages=146–147}}</ref> Commercial vehicle manufacturers sell "chassis only", "cowl and chassis", as well as "[[chassis cab]]" versions that can be outfitted with specialized bodies. These include [[Recreational vehicle|motor homes]], [[fire apparatus|fire engines]], [[ambulance]]s, [[box truck]]s, etc.

In particular applications, such as [[school bus]]es, a government agency like [[National Highway Traffic Safety Administration]] (NHTSA) in the U.S. defines the design standards of chassis and body conversions.<ref>{{cite book|last1=Grenzeback|first1=Lance R.|first2=Sandi|last2=Lin|first3=Jacob|last3=Meunier|title=Operational Differences and Similarities among the Motorcoach, School Bus, and Trucking Industries|year=2005|publisher=Transportation Research Board|isbn=978-0-309-08821-3|url=https://books.google.com/books?id=BdzIVGZASxAC&q=cowl+and+chassis+commercial+vehicle&pg=PA13|access-date=10 September 2010|page=13}}</ref>

An [[armoured fighting vehicle]]'s hull<ref>Starry p. 45, 79, 129, 143, 153, etc.</ref> serves as the chassis and comprises the bottom part of the AFV that includes the [[continuous track|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 [[gun turret|turret]]. The hull serves as a basis for [[Car platform|platform]]s on [[tank]]s, [[armoured personnel carrier]]s, [[military engineering vehicles|combat engineering vehicle]]s, etc.

In the [[intermodal freight transport|intermodal]] trucking industry, a [[Container chassis|chassis]] is a type of semi-trailer onto which a [[intermodal container|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 [[printed circuit board|circuit board]]s and other electronics are mounted.<ref>{{cite book|last=Khandpur|first=Raghbir Singh|title=Troubleshooting Electronic Equipment|year=2006|publisher=McGraw-Hill Professional|isbn=978-0-07-147731-4|url=https://books.google.com/books?id=vzynnyINF20C&q=electronic+chassis&pg=PA45|access-date=10 September 2010|page=45}}</ref>

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 case]]s, lightweight covers or panels are attached to the chassis.

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

===Firearms===
[[File:XM2010 November 2010.jpg|thumb|The [[M2010 Enhanced Sniper Rifle]], based on the [[bolt-action]] [[Remington 700]] design but [[rifle bedding|bedded]] inside an [[accurizing]] chassis.]]
{{see also|Rifle bedding}}
In firearms, the chassis is a [[rifle bedding|bedding]] frame on [[long gun]]s such as [[rifle]]s to replace the traditionally wooden [[Stock (firearms)|stock]], for the purpose of better [[accurizing]] the gun. The chassis is usually made from hard [[metal]]lic 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 [[gun barrel|barrel]]ed [[action (firearms)|action]] bedded into a metal chassis would theoretically operate more consistently during repeated firing, resulting in better [[accuracy and precision|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 system]]s that provide mounting points for various accessories.

==See also==
{{Wiktionary}}
{{Commons category|Chassis}}
{{Div col|colwidth=22em}}
*[[Airframe]]
*[[Backbone chassis]]
*[[Body-on-frame]]
*[[Coachbuilder]]
*[[Monocoque]], construction from a structural shell instead of a structural frame
*[[Undercarriage (disambiguation)]]
{{div col end}}

==References==
*Starry, Donn A. GEN. ''Mounted Combat in Vietnam.'' ''Vietnam Studies''; [[Department of the Army]], [[Washington, D.C.]] 1978.
{{reflist}}
{{Chassis control systems}}
{{CarDesign nav}}

[[Category:Automotive chassis types]]
[[Category:Vehicle technology]]
[[Category:Computer enclosure]]
[[Category:Carriages and mountings]]

Chassis - Revision history

UpdateBot at 08:48, 31 May 2022