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Under the Whyte notation for the classification of steam locomotives, 2-2-2 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and two trailing wheels on one axle. The wheel arrangement both provided more stability and enabled a larger firebox than the earlier 0-2-2 and 2-2-0 types.
The Patentee locomotive was a revolutionary 2-2-2 steam locomotive type introduced by Robert Stephenson and Company in 1833, as an enlargement of their 2-2-0 Planet type. The wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and two trailing wheels on one axle provided more stability and enabled a larger firebox than the earlier 0-2-2 and 2-2-0 types.
Model (2002) of the steam locomotive constructed in Russia by the Cherepanovs (1834) Bury 2-2-0 for the London and Birmingham Railway. Under the Whyte notation for the classification of steam locomotives, 2-2-0 represents the wheel arrangement of two leading wheels on one axle, two powered driving wheels on one axle, and no trailing wheels.
It was the first locomotive to employ inside cylinders, and subsequently the 2-2-0 type became known as Planets. On 23 November 1830 No.9 Planet ran the approximately 50 km (30 mi) from Liverpool to Manchester in one hour. It only lasted in service about ten years; having been rebuilt in 1833, it was withdrawn circa 1840–1841. [1]
The sun and planet gear converted the vertical motion of a beam, driven by a steam engine, into circular motion using a 'planet', a cogwheel fixed at the end of the connecting rod (connected to the beam) of the engine. With the motion of the beam, this revolved around, and turned, the 'sun', a second rotating cog fixed to the drive shaft, thus ...
In July 2012, one of Kepler's four reaction wheels (wheel 2) failed. [24] On May 11, 2013, a second wheel (wheel 4) failed, jeopardizing the continuation of the mission, as three wheels are necessary for its planet hunting. [22] [23] Kepler had not collected science data since May because it was not able to point with sufficient accuracy. [105]
Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer, or planet, gears or pinions, revolving about a central sun gear or sun wheel. [4] [5] Typically, the planet gears are mounted on a movable arm or carrier, which itself may rotate relative to the sun gear.
Though four-wheel "riding" tractors began to spread in the 1960s, and are taking over primary tillage operations, 2-wheel tractors are still popular in Japan for primary tillage and inter-cultivation in vegetable production, transportation around the farm, etc. Most farm households that own a 4-wheel tractor also own at least one 2-wheel tractor.