# Powertrain > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Powertrain > Markdown URL: https://mediated.wiki/source/Powertrain.md > Source: https://en.wikipedia.org/wiki/Powertrain > Source revision: 1333310348 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) System that powers a motor vehicle Not to be confused with [drivetrain](/source/Drivetrain). For the UK engine manufacturer, see [Powertrain Ltd](/source/Powertrain_Ltd). For the character from the *Transformers* franchise, see [Powertrain (Transformers)](/source/Powertrain_(Transformers)). This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Powertrain" – news · newspapers · books · scholar · JSTOR (January 2010) (Learn how and when to remove this message) Powertrain of a modern automobile, comprising engine, torque converter or flywheel, transmission, drive shaft, suspension and the wheels. This specific powertrain features all-wheel drive. In a [motor vehicle](/source/Motor_vehicle), the **powertrain** comprises the main components that generate [power](/source/Engine_power) and deliver that power to the road surface, water, or air. This includes the [engine](/source/Internal_combustion_engine), [transmission](/source/Transmission_(mechanics)), [drive shafts](/source/Drive_shaft), [differentials](/source/Differential_(mechanics)), and the final drive ([drive wheels](/source/Drive_wheel), [continuous track](/source/Continuous_track) as in military tank or caterpillar tractors, [propeller](/source/Propeller), etc.). Hybrid powertrains also include one or more electric traction motors that operate to drive the vehicle wheels. All-electric vehicles ("electric cars") eliminate the engine altogether, relying solely on electric motors for propulsion. Occasionally the term **powerplant** is casually used to refer to the engine or, less often, the entire powertrain. A motor vehicle's **driveline** or [drivetrain](/source/Drivetrain) consists of the parts of the powertrain excluding the engine. It is the portion of a vehicle, after the [prime mover](/source/Prime_mover_(locomotive)), that changes depending on whether a vehicle is [front-wheel](/source/Front-wheel_drive), [rear-wheel](/source/Rear-wheel_drive), or [four-wheel drive](/source/Four-wheel_drive), or less-common [six-wheel](/source/Six-wheel_drive) or [eight-wheel drive](/source/Eight-wheel_drive). In a wider sense,[*[compared to?](https://en.wikipedia.org/wiki/Wikipedia:Avoid_weasel_words)*] the powertrain includes all of the components used to transform stored (chemical, solar, nuclear, kinetic, potential, etc.) energy into kinetic energy for propulsion purposes. This includes the utilization of multiple power-sources and non–wheel-based vehicles. ## Developments The most recent developments in powertrain are driven by the electrification of it in multiple components. Electrical energy needs to be provided, usually this leads to larger batteries. Electric motors can be found as isolated components or as part of other elements, e.g. the [axle](/source/Axle). In hybrid powertrains the [torque](/source/Torque) generated by the combustion engine and the electric motor have to be brought together and distributed to the wheels. The control of this process can be quite involved but the rewards are greatly improved acceleration and much lower emissions. Powertrain development for [diesel engines](/source/Diesel_engine) involves the following: [exhaust gas recirculation](/source/Exhaust_gas_recirculation) (EGR), and advanced combustion. [Spark ignition](/source/Spark_ignition) engine development include: [fuel injection](/source/Fuel_injection), including the [gasoline direct injection](/source/Gasoline_direct_injection) variant, as well as improving [volumetric efficiency](/source/Volumetric_efficiency) by using [multi-valves](/source/Multi-valve) per cylinder, [variable valve timing](/source/Variable_valve_timing), [variable length intake manifolds](/source/Variable_length_intake_manifold), and [turbocharging](/source/Turbocharger). Changes also include new fuel qualities (no [sulphur](/source/Sulphur) or [aromates](/source/Aromate)) to allow new combustion concepts. So-called "combined combustion systems" (CCV) or "diesotto" cycles are based on synthetic fuels (synthetic diesel, [biomass to liquid](/source/Biomass_to_liquid) (BTL) or [gas to liquid](/source/Gas_to_liquid) (GTL)).[1] [BEVs](/source/Battery_electric_vehicle), [FCEVs](/source/Fuel_cell_vehicle) and [PHEV](/source/Plug-in_hybrid) powertrains are expected to reach cost parity with [ICE](/source/Internal_combustion_engine) powertrains in 2025.[2] ## Key Components This section may incorporate text from a large language model, which is prohibited in Wikipedia articles. It may include hallucinated information, copyright violations, claims not verified in cited sources, original research, or fictitious references. Any such material should be removed. (September 2025) (Learn how and when to remove this message) The powertrain of a vehicle refers to the collection of components that generate power and deliver it to the wheels, enabling the vehicle to move. Powertrains can vary significantly between conventional internal combustion engine (ICE) vehicles, hybrid vehicles (HEVs), and electric vehicles (EVs). Regardless of the type, the powertrain remains one of the most critical systems in any vehicle. *** Engine:** The engine is the heart of the powertrain in conventional ICE vehicles. It converts fuel, such as gasoline or diesel, into mechanical energy through the process of combustion. Engines come in various forms, including internal combustion engines, which are the most common, and electric motors, which are predominant in EVs. Hybrid vehicles often combine both systems to maximize fuel efficiency and reduce emissions. Each engine type has its unique design and operational characteristics, but all aim to produce the torque required to propel the vehicle. *** Electric Motor and Inverter:** In electric vehicles, the electric motor replaces the traditional engine, converting electrical energy into mechanical energy to drive the wheels. This motor is highly efficient and eliminates the need for some of the more complex components found in ICE vehicles, such as exhaust systems or fuel tanks. Inverters are critical in EVs, as they control the motor's performance by regulating power output and enabling variable speeds. Together, the motor and inverter form the backbone of the electric powertrain. *** Transmission:**The transmission is responsible for transferring mechanical energy from the engine or motor to the drivetrain. It ensures that the power generated by the engine is delivered to the wheels in the most efficient manner, adjusting for speed and load. There are several types of transmissions, including manual transmissions, where the driver shifts gears; automatic transmissions, which shift gears automatically; continuously variable transmissions (CVTs), which offer seamless acceleration; and dual-clutch transmissions (DCTs), known for their rapid gear changes and improved performance. *** Control Units:**Modern powertrains are heavily dependent on electronic control units (ECUs) or powertrain control modules (PCMs). These systems monitor and optimize the performance of the engine, transmission, and other components. By analyzing data from sensors throughout the vehicle, ECUs ensure the powertrain operates at peak efficiency while also complying with emissions and performance standards. Control units are essential for advanced features like adaptive driving modes and predictive maintenance. *** Drivetrain:**The drivetrain is the system that connects the transmission to the wheels, distributing power as needed. It includes key components such as the driveshaft, which transfers rotational power, the differential, which allows the wheels to rotate at different speeds for smoother cornering, and the axles, which deliver power directly to the wheels. The drivetrain configuration varies by vehicle type, with common setups being front-wheel drive (FWD), rear-wheel drive (RWD), and all-wheel drive (AWD) or four-wheel drive (4WD), each offering distinct advantages depending on the application. ## Manufacturing The manufacturing of powertrain components and systems is important to industry, including the automotive and other vehicle sectors. Competitiveness drives companies to engineer and produce powertrain systems that over time are more economical to manufacture, higher in product quality and reliability, higher in performance, more fuel efficient, less polluting, and longer in life expectancy. In turn these requirements have led to designs involving higher internal pressures, greater instantaneous forces, and increased complexity of design and mechanical operation. The resulting designs in turn impose significantly more severe requirements on parts shape and dimension; and material surface [flatness](/source/Flatness_(manufacturing)), [waviness](/source/Waviness), [roughness](/source/Surface_roughness), and [porosity](/source/Porosity). [Quality control](/source/Quality_control) over these parameters is achieved through [metrology](/source/Metrology) technology applied to all of the steps in powertrain manufacturing processes. ## Frames and powertrains In automotive manufacturing, the [frame](/source/Frame_(vehicle)) plus the "running gear" makes the [chassis](/source/Chassis). Later, a body (sometimes referred to as "[coachwork](/source/Coachwork)"), which is usually not necessary for integrity of the structure, is built on the chassis to complete the [vehicle](/source/Vehicle). Commercial vehicle manufacturers may have "chassis only" and "cowl and chassis" versions that can be outfitted with specialized bodies. These include [buses](/source/Bus), [motor homes](/source/Motor_home), [fire engines](/source/Fire_engine), [ambulances](/source/Ambulance), etc. The frame plus the body makes a [glider](/source/Vehicle_glider) (a vehicle without a powertrain). ## Final drive A cutaway view of an automotive final drive unit, which contains the differential The final drive is the last in the set of components which delivers torque to the [drive wheels](/source/Drive_wheel). In a road vehicle, it incorporates the [differential](/source/Differential_(mechanical_device)). In a railway vehicle, it sometimes incorporates the reversing gear. Examples include the [Self-Changing Gears](/source/Self-Changing_Gears) RF 28 (used in many [first-generation diesel multiple units](/source/List_of_British_Rail_diesel_multiple_unit_classes) of [British Railways](/source/British_Railways))[3] and RF 11 used in the [British Rail Class 03](/source/British_Rail_Class_03) and [British Rail Class 04](/source/British_Rail_Class_04) diesel shunting locomotives. ## Variations This section uses infographics to show a unified model with variations, the green wheels denote no traction, and the angled wheels denote steering. 6X4 means 6 wheel ends and 4 positions distribute power (power divider installed) 6X2 means 6 wheel ends and 2 positions distribute power (single axle drive) 4X0 means 4 wheel ends no power (Trailer axle) 4x2 means 4 Wheel ends, 2 Positions to distribute power The 6 wheel ends can either be wide base singles or duals. Its about the outside of the wheels. Code Description Use Graphic RWD Rear Wheel Drive Small Van RWD powertrain show drive to the rear wheels only 4WD Four Wheel Drive AKA 4x4 Pick Up Truck 4WD powertrain shows drive to all wheels FWD Front Wheel Drive Van, Where Weight is desired over front wheels power going to the front wheels only DWD Dual Wheel Drive (Dually) Extra load Capacity is required to a 4WD power to Dual Rear Wheel 6X4 A 6×4 or six-by-four is a vehicle with three axles, with a drivetrain delivering power to two wheel ends on two of them. It is a form of four-wheel drive but not one of all-wheel drive. Classic Truck twin rear axles providing drive via 8 wheels 6x6 6X6, a standard class of medium-duty trucks Classic Mil spec 6x6 drive train power to rear and front 6X2 - Rear Lift In its purest form, a 6x2 chassis configuration is a three-axle tractor with power going to just one of the tandem rear axles. Put another way, only two of the six wheel positions are powered. Where Trucks need a shorter turn radius and at times don't need the extra axle to improve fuel consumption (the rear wheels can be lifted off the ground when not needed) 6x2 power to the middle wheels 6x2 Mid Lift three-axle tractor with power going to just one of the tandem rear axles. The middle axle is able to be lifted, typical use is where max weight is given to cargo (such as fuel tankers), sometimes the middle axle as smaller wheels and tyres mid lift showing the middle can be lifted off the ground 8X4 8X4 means that the Truck has four axles, two of which are driving axles. Typical use is a Tipper Truck, which has on and off-road requirements. graphic showing power to all wheels 8X8 Eight-wheel drive, often notated as 8WD or 8×8, is a drivetrain configuration that allows all eight wheels of an eight-wheeled vehicle to be drive wheels (that is, to receive power from the engine) simultaneously. Military or extremely high-load and off-road capability is required. graphic showing power going to all eight wheels 6x6 Six-wheel drive (6WD or 6×6) is an all-wheel drive drivetrain configuration of three axles with at least two wheels on each axle capable of being driven simultaneously by the vehicle's engine. Typical Small to medium Mining Truck or Military use. six wheel drive Half-Track A half-track is a civilian or military vehicle with regular wheels at the front for steering and continuous tracks at the back to propel the vehicle and carry most of the load. The purpose of this combination is to produce a vehicle with the cross-country capabilities of a tank and the handling of a wheeled vehicle. Typical WW2 era not main streamed produced today. a half track combination Tracked Continuous track or tracked treads are a system of vehicle propulsion used in tracked vehicles, running on a continuous band of treads or track plates driven by two or more wheels. The large surface area of the tracks distributes the weight of the vehicle better than steel or rubber tyres on an equivalent vehicle, enabling continuous tracked vehicles to traverse soft ground with less likelihood of becoming stuck due to sinking. Tractors, Tanks, Excavators, and Dozers. tracked vehicle Electric An electric vehicle (EV) is a vehicle that uses one or more electric motors for propulsion. It can be powered by a collector system, with electricity from extravehicular sources, or it can be powered autonomously by a battery (sometimes charged by solar panels, or by converting fuel to electricity using fuel cells or a generator). EVs include but are not limited to road and rail vehicles, and broadly can also include electric boat and underwater vessels (submersibles, and technically also diesel- and turbo-electric submarines), electric aircraft and electric spacecraft. In this power train the EV is powered by a large onboard engine, and has the typical application of very heavy-duty mining truck. engine, alternator, twin motors and power to rear wheels ## See also - [Car safety](/source/Car_safety) - [Electric vehicle](/source/Electric_vehicle) - [Electric vehicle conversion](/source/Electric_vehicle_conversion) - [Giubo](/source/Giubo) - [Gear train](/source/Gear_train) - [Hybrid vehicle drivetrain](/source/Hybrid_vehicle_drivetrain) - [Three-wheeled vehicles](/source/Three-wheeled_vehicle_(disambiguation)) ## References 1. **[^](#cite_ref-1)** [Mercedes plans petrol/diesel hybrid](https://web.archive.org/web/20060524222949/http://www.autocar.co.uk/news_article.asp?na_id=215129) 1. **[^](#cite_ref-2)** [McKinsey & Company - A portfolio of power-trains for Europe](https://www.fch.europa.eu/sites/default/files/documents/Power_trains_for_Europe.pdf) 1. **[^](#cite_ref-3)** Mann, R. H., *Diesel Rail-Cars*, Draughtsmens and Allied Technicians Association, 1964, pp 45–50 ## External links Look up ***[drivetrain](https://en.wiktionary.org/wiki/drivetrain)*** or ***[powertrain](https://en.wiktionary.org/wiki/powertrain)*** in Wiktionary, the free dictionary. Wikimedia Commons has media related to [Powertrain](https://commons.wikimedia.org/wiki/Category:Powertrain). - [New powertrain technologies conference, 27 and 28- March-2007](http://www.autonews.com/files/07_ane_ptc/). - [http://www.caradvice.com.au/105/car-frame-chassis/](http://www.caradvice.com.au/105/car-frame-chassis/) - [Honda F1 Race Car Frame](https://web.archive.org/web/20061216084740/http://www.sportcompactcarweb.com/motorsports/0507_scc_british_american_racing_formula_one_honda_shop/photo_10.html). - [Drivetrain Quiz](https://web.archive.org/web/20100616015747/http://carcare.org/car-care-articles/drivetrain) - HIL Test Bench (Delphi Motor) [Technical Paper: A Closed-Loop Drive-train Model](https://web.archive.org/web/20101123023209/http://delphi.com/pdf/techpapers/2009-01-1139.pdf) - [Learn what a final drive ratio is and how it affects your car](https://www.motorauthority.com/news/1108398_learn-what-a-final-drive-ratio-is-and-how-it-affects-your-car) v t e Powertrain Part of the Automobile series Automotive engine Diesel engine Electric Fuel cell Hybrid (Plug-in hybrid) Internal combustion engine Petrol engine Steam engine Transmission Automatic transmission Chain drive Direct-drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Drive wheel Automated manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gearshift Giubo Hotchkiss drive Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park-by-wire Preselector gearbox Semi-automatic transmission Shift-by-wire Torque converter Transaxle Transfer box Transmission control unit Universal joint Wheels and tires Wheel hub assembly Wheel Rim Alloy wheel Hubcap Tire Off-road Racing slick Radial Rain Run-flat Snow Spare Tubeless Hybrid Electric motor Hybrid vehicle drivetrain Electric generator Alternator Portal Category Authority control databases International GND National United States Israel Other Yale LUX --- Adapted from the Wikipedia article [Powertrain](https://en.wikipedia.org/wiki/Powertrain) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Powertrain?action=history)). 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