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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.
An epicyclic gear train (also known as a planetary gearset) is a gear reduction assembly consisting of two gears mounted so that the center of one gear (the "planet") revolves around the center of the other (the "sun"). A carrier connects the centers of the two gears and rotates, to carry the planet gear(s) around 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 gearbox of the car was also novel, having dual epicyclic gears and being bolted directly to the engine. This allowed four speeds, with direct drive in top gear. All the gears were helical, and enclosed in an oil bath, making for very silent transmission. Reverse gear was built into the rear axle, as was the foot-operated brake drum, all of ...
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.
The engine is a Gardner 8-cylinder 4 stroke "8L3" connected to a Wilson-Drewry CA5 5-speed epicyclic gearbox with a Vulcan-Sinclair type 23 fluid coupling and a Wiseman type 15 RLGB gearbox. While all technically similar, the locomotives had two different designs for the back of the cab, the first 15 locomotives having three windows, the ...