|
The Brough Superior Golden Dream was designed and built by George Brough in Nottingham, England, in 1938. With its distinctive gold finish, this was to be the ultimate Brough Superior but production was stopped by the outbreak of War in 1939. ==Development== Designed as a team effort by Brough, 'Ike' Hatch, and Freddie Dixon, the engine has two horizontally opposed flat twins one above the other and geared together, thus rotating counter to each other forming an H engine. Connecting rods from opposed cylinders were of the fork and blade type and thus shared a common crank pin. All pistons moved in unison, that is to the left or to the right at the same time. The pistons could thus be counterweighted 100% yielding a perfect balance. Primary, secondary and higher-order sources of vibration canceled each other, as did the gyroscopic effects from each crankshaft.〔Motorcycle Engineering by P.E. Irving, Temple Press Limited, London, Pages 284 and 285.〕〔 George Brough described it a "flat vertical" engine. The four cylinders were equating to 988 cc, with the camshafts gear-driven. Further development work was done on the engine, reconfiguring it as (998cc),〔 with chain-driven camshafts.〔 The engine was a four stroke engine.〔http://www.moto-collection.org/moto-collection/modele_en.php?idfiche=614〕 The frame was designed to accommodate the unusual engine and was welded together with a fully sprung plunger type springing for the rear wheel, unlike the cantilever swingarm suspension on the Brough Superior SS100.〔 The forks were Brough Superior's "Castle" forks〔 derived from a Harley-Davidson design, and many components such as the petrol tank, saddle and wheels were the same as standard Brough Superior machines. The Dream had optional three or four speed transmission, manufactured to Brough's own design by David Brown Ltd. of Huddersfield. The final shaft drive had an underslung worm and pinion gear on the rear axle and the propeller shaft was enclosed in a tube. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brough Superior Golden Dream」の詳細全文を読む スポンサード リンク
|