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A preselector gearbox is a type of gearbox used on a variety of vehicles, more commonly until around the 1950s. It was invented by Colonel Walter Gordon Wilson, 1874-1957, and was first used in World War I tanks. Combatants Allies: Serbia, Russia, France, Romania, Belgium, British Empire, United States, Italy, and others Central Powers: Germany, Austria-Hungary, Bulgaria, Ottoman Empire Casualties Military dead:5 million Civilian dead:3 million Total dead:8 million Military dead:4 million Civilian dead:3 million Total dead:7 million The First World...
As its name suggests, gear changes were made by selecting a gear ratio in advance of it being needed. The chosen gear was then brought into operation by pressing and releasing the 'gear change pedal', which was normally the left pedal, installed in place of the usual clutch pedal. It is not to be confused with automatic transmission, in that gear changing is initiated by the driver. Rear side of a Ford V6 engine, looking at the clutch housing on the flywheel Single, dry, clutch friction disc. ...
An automatic transmission is an automobile gearbox that can change gear ratios automatically as the car or truck moves, thus freeing the driver from having to shift gears manually. ...
They were common on Daimler and Armstrong-Siddeley cars as well as on many London buses. They have also been used in racing cars, such as the 1935 ERA R4D [1], and tanks, such as the German Tiger I and II in World War II. Logo of Daimler 1898 Daimler car in Bristol Industrial Museum, England This article is about the British automobile manufacturer. ...
The Armstrong-Siddeley automobiles (and later aircraft engines) were an English marque manufactured from 1919 (after the company was formed in 1917 by a merger between two Coventry_based companies, Armstrong-Whitworth and Siddeley-Deasy) to 1960. ...
A Routemaster bus This article is a general one on buses in London. ...
English Racing Automobiles (ERA) was a Formula One constructor from 1950 through 1952. ...
The Panzerkampfwagen VI Ausf. ...
Combatants Allies: Poland, British Commonwealth, France/Free France, Soviet Union, United States, China, and others Axis Powers: Germany, Italy, Japan, and others Casualties Military dead: 17 million Civilian dead: 33 million Total dead: 50 million Military dead: 8 million Civilian dead: 4 million Total dead: 12 million World War II...
Unlike the "crash" gearboxes of the first half of the 20th century, the gearwheels in a preselector box are permanently in mesh in an epicyclic layout. Epicyclic gearing is used here to increase output speed. ...
On some cars, starting off from rest involved using the gear change pedal like a clutch. On others, first gear could be selected but while the engine was still idling the car would not move even after the gear change pedal had been pressed and released. When the accelerator was pressed a centrifugal clutch would engage and the car would begin to move.
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