Driving wheel

Driving wheel
The driving wheels (boxed) on a 4-6-2 locomotive.
The four driving wheels on one side of a 4-8-4 locomotive.

On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons (or turbine, in the case of a steam turbine locomotive). On a conventional, non-articulated locomotive, the driving wheels are all coupled together with side rods (also known as coupling rods); normally one pair is directly driven by the main rod (or connecting rod) which is connected to the end of the piston rod; power is transmitted to the others through the side rods.

On Diesel and Electric locomotives the driving wheels may be directly driven by the traction motors. Coupling rods are not usually used, and it is quite common for each axle to have its own motor. Jackshaft drive and coupling rods were used in the past (e.g. in the Swiss Crocodile locomotive) but their use is now confined to shunting locomotives.

On an articulated locomotive or a duplex locomotive driving wheels are grouped into sets which are linked together within the set.

Contents

Diameter

One of six 6 ft 8 in (2.03 m) driving wheels belonging to 60163 Tornado

Driving wheels are generally larger than leading or trailing wheels. Since a conventional steam locomotive is directly driven, one of the few ways to 'gear' a locomotive for a particular performance goal is to size the driving wheels appropriately. Freight locomotives generally had driving wheels between 40 and 60 inches (1,016 and 1,524 mm) in diameter; dual-purpose locomotives generally between 60 and 70 inches (1,524 and 1,778 mm), and passenger locomotives between 70 and 100 inches (1,778 and 2,540 mm) or so. Some long wheelbase locomotives (four or more coupled axles) were equipped with blind drivers. These were driving wheels without the usual flanges, which allowed them to negotiate tighter curves without binding.

The driving wheels on express passenger locomotives have come down in diameter over the years, e.g. from 8 ft 1 in (2,464 mm) on the GNR Stirling 4-2-2 of 1870 to 6 ft 2 in (1,880 mm) on the SR Merchant Navy Class of 1941. This is because improvements in valve design allowed for higher piston speeds.

Balancing

A driving wheel on a steam locomotive.

On steam locomotives the driving wheels have balance weights to balance the weight of the coupling and connecting rods. The crescent-shaped balance weight is clearly visible in the picture on the right.

Whyte notation

In the Whyte notation, driving wheels are designated by the middle number or numbers in the set. The UIC classification system counts the number of axles rather than the number of wheels and driving wheels are designated by letters rather than numbers. The suffix 'o' is used to indicate independently powered axles.

The number of driving wheels on locomotives varied quite a bit. Some early locomotives had as few as two driving wheels (one axle). The largest number of total driving wheels was 24 (twelve axles) on the 2-8-8-8-2 and 2-8-8-8-4 locomotives. The largest number of coupled driving wheels was 14 (seven axles) on the ill-fated AA20 4-14-4 locomotive.

Other uses of the term driving wheel

The term driving wheel is sometimes used to denote the drive sprocket which moves the track on tracked vehicles such as tanks and bulldozers.

In popular culture

The Canadian band Cowboy Junkies perform a song called "Lost My Driving Wheel", with the lyrics "I feel like an old engine/ That's lost my driving wheel" and can't go any further.

Many versions the American folk song In the Pines reference a decapitated man's head being found in a driving wheel.

See also


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Look at other dictionaries:

  • Driving wheel — Driving Driv ing, a. 1. Having great force of impulse; as, a driving wind or storm. [1913 Webster] 2. Communicating force; impelling; as, a driving shaft. [1913 Webster] {Driving axle}, the axle of a driving wheel, as in a locomotive. {Driving… …   The Collaborative International Dictionary of English

  • driving wheel — n. a wheel that transmits motion, as one of the large wheels of a locomotive which receive power from the engine by means of the connecting rod …   English World dictionary

  • Driving Wheel (song) — Not to be confused with the Foghat or T Bone Burnett songs. Driving Wheel Blues Single by Roosevelt Sykes aka The Honey Dripper B side Barrel House Man Released 1936 ( …   Wikipedia

  • driving wheel — noun On a steam locomotive, a powered wheel driven by the locomotives pistons or turbine. Syn: driving axle …   Wiktionary

  • driving wheel — main wheel which transmits motion, main wheel which creates motion …   English contemporary dictionary

  • driving wheel — /ˈdraɪvɪŋ wil/ (say druyving weel) noun 1. Machinery a main wheel which communicates motion to others. 2. one of the propelling wheels of a locomotive; any wheel used to transform the force of the locomotive cylinder into tractive effort. 3. one… …  

  • driving wheel — The wheel(s) which is driven by the engine through the drivetrain. Also called the driven wheel …   Dictionary of automotive terms

  • driving wheel — noun a wheel that drives a motor vehicle (transforms torque into a tractive force) • Hypernyms: ↑wheel • Part Holonyms: ↑drive line, ↑drive line system …   Useful english dictionary

  • driving wheel — 1. Mach. a main wheel that communicates motion to others. 2. Also called driver. Railroads. one of the wheels of a locomotive that transmits the power of an engine or motor into tractive effort. [1830 40] * * * …   Universalium

  • driving-wheel — …   Useful english dictionary

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