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1931 Bugatti Type 51 cockpit, with Wilson preselector gearbox. The most common type of pre-selector gearbox was the Wilson, which used an epicyclic design. [5] [6] A precursor to the Wilson gearbox was the manually-controlled epicyclic gearbox used in the 1901–1904 Wilson-Pilcher cars built in the United Kingdom.
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.
Self-Changing Gears was a British company, set up and owned equally by Walter Gordon Wilson and John Davenport Siddeley, to develop and exploit the Wilson or pre-selector gearbox. Self-Changing Gears designed, built and licensed transmissions for various applications including light and heavy road vehicles, military, marine, and rail vehicles ...
This advantageous geometric construction sets us free from Robert Willis' famous and tedious formula, [17] because all calculations are exclusively determined by lengths ratios, respectively teeth numbers on the abscissa for the 4 epicyclic ratios, and of rotational speeds on the 3rd ordinate for the 10 gear ratios.
In 1918, some work went on to test a Lanchester epicyclic gearbox as the main transmission. The use of an epicyclic gearbox wasn't new, as Lanchester had used a manually-controlled a 3-speed since 1900. 1928, Wilson uses his knowledge of epicyclic gearboxes controlled by brake bands to produce his pre-selector gearbox.
The last Regent III built, operated by Ipswich Corporation. The Regent III was mainly built for operation outside London and overseas. It could be fitted with AEC's 9.6-litre diesel engine (except a minority with 7.7-litre ones), 'Wilson' preselective epicyclic gearbox (except for a minority with crash gearboxes; a synchromesh option also became available in the early 1950s) and air-pressure ...
The engine is a Gardner 8-cylinder, 4-stroke 8L3 of 204 hp (152 kW) connected to a Wilson-Drewry CA5 R7, 5-speed epicyclic gearbox with RF11 spiral bevel reverse and final-drive unit. Drive is through a jackshaft mounted beneath the cab, driving the wheels through coupling rods .
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