Powertrain

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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. Subaru Liberty powertrain (2010-10-16).jpg
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, the powertrain comprises the main components that generate power and deliver that power to the road surface, water, or air. This includes the engine, transmission, drive shafts, differentials, and the final drive (drive wheels, continuous track as in military tanks or caterpillar tractors, 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.

Contents

A motor vehicle's driveline or drivetrain consists of the parts of the powertrain excluding the engine. It is the portion of a vehicle, after the prime mover, that changes depending on whether a vehicle is front-wheel, rear-wheel, or four-wheel drive, or less-common six-wheel or eight-wheel drive.

In a wider sense, 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 component or as part of other elements, e.g. the axle. In hybrid powertrains the 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 involves the following: exhaust gas recirculation (EGR), and advanced combustion. Spark ignition engine development include: fuel injection, including the gasoline direct injection variant, as well as improving volumetric efficiency by using multi-valves per cylinder, variable valve timing, variable length intake manifolds, and turbocharging. Changes also include new fuel qualities (no sulphur or aromates) to allow new combustion concepts. So-called "combined combustion systems" (CCV) or "diesotto" cycles are based on synthetic fuels (synthetic diesel, biomass to liquid (BTL) or gas to liquid (GTL)). [1]

BEVs, FCEVs and PHEV powertrains are expected to reach cost parity with ICE powertrains in 2025. [2]

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, waviness, roughness, and porosity. Quality control over these parameters is achieved through metrology technology applied to all of the steps in powertrain manufacturing processes.

Frames and powertrains

In automotive manufacturing, the frame plus the "running gear" makes the chassis.

Later, 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. Commercial vehicle manufacturers may have "chassis only" and "cowl and chassis" versions that can be outfitted with specialized bodies. These include buses, motor homes, fire engines, ambulances, etc.

The frame plus the body makes a glider (a vehicle without a powertrain).

Final drive

A cutaway view of an automotive final drive unit, which contains the differential Differentialgetriebe2.jpg
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. In a road vehicle, it incorporates the differential. In a railway vehicle, it sometimes incorporates the reversing gear. Examples include the Self-Changing Gears RF 28 (used in many first-generation diesel multiple units of British Railways) [3] and RF 11 used in the British Rail Class 03 and 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.

CodeDescriptionUseGraphic
RWDRear Wheel DriveSmall Van
RWD powertrain show drive to the rear wheels only Rear wheel drive RWD.jpg
RWD powertrain show drive to the rear wheels only
4WDFour Wheel Drive AKA 4x4Pick Up Truck
4WD powertrain shows drive to all wheels 4WD-power to all wheels.jpg
4WD powertrain shows drive to all wheels
FWDFront Wheel DriveVan, Where Weight is desired over front wheels
power going to the front wheels only FWD - Front Wheel Drive.jpg
power going to the front wheels only
DWDDual Wheel Drive (Dually)Extra load Capacity is required to a 4WD
power to Dual Rear Wheel Dually (DRW) Dual Rear Wheel.jpg
power to Dual Rear Wheel
6X4A 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 6x4 the double axel dual wheels.jpg
twin rear axles providing drive via 8 wheels
6x66X6, a standard class of medium-duty trucks Classic Mil spec
6x6 drive train power to rear and front 6x6 drive train power to rear and front.jpg
6x6 drive train power to rear and front
6X2 - Rear LiftIn 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-rear-lift.jpg
6x2 power to the middle wheels
6x2 Mid Liftthree-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 6x2-mid-lift.jpg
mid lift showing the middle can be lifted off the ground
8X48X4 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 8x4 drive train for truck.jpg
graphic showing power to all wheels
8X8Eight-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 8x8 drive train.jpg
graphic showing power going to all eight wheels
6x6Six-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 6x6 drive train.jpg
six wheel drive
Half-TrackA 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 Half-track drive train.jpg
a half track combination
TrackedContinuous 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 Fulltrack.jpg
tracked vehicle
ElectricAn 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 Hybrid-for-miningtruck.jpg
engine, alternator, twin motors and power to rear wheels

See also

Related Research Articles

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<span class="mw-page-title-main">Hybrid vehicle</span> Vehicle using two or more power sources

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<span class="mw-page-title-main">Diesel–electric powertrain</span> Propulsion system for vehicles

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<span class="mw-page-title-main">Dynamometer</span> Machine used to measure force or mechanical power

A dynamometer or "dyno" for short, is a device for simultaneously measuring the torque and rotational speed (RPM) of an engine, motor or other rotating prime mover so that its instantaneous power may be calculated, and usually displayed by the dynamometer itself as kW or bhp.

<span class="mw-page-title-main">Drive shaft</span> Mechanical component for transmitting torque and rotation

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The following outline is provided as an overview of and topical guide to automobiles:

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This glossary of automotive terms is a list of definitions of terms and concepts related to automobiles, including their parts, operation, and manufacture, as well as automotive engineering, auto repair, and the automotive industry in general. For more specific terminology regarding the design and classification of various automobile styles, see Glossary of automotive design; for terms related to transportation by road, see Glossary of road transport terms; for competitive auto racing, see Glossary of motorsport terms.

References

  1. Mercedes plans petrol/diesel hybrid
  2. McKinsey & Company - A portfolio of power-trains for Europe
  3. Mann, R. H., Diesel Rail-Cars, Draughtsmens and Allied Technicians Association, 1964, pp 45–50