Motorbike frames

Motorbike frames

Daimler motorcycle frame z 1885 year was built of hickory wood. The height of the long-stroke single-cylinder engine used in the vehicle had a decisive influence on its size. The saddle was placed at a height 86 cm, so that the rider was rather standing, than he was sitting on the motorcycle.

The metal frame was built only by the Frenchman Mayer in 1869 year (some sources report a tubular frame already in 1860 r.). The shapes of the frame changed gradually: from cross and circular, up to the trapezoidal frame, which she first used in 1885 of the year, the English Humber bicycle factory. This frame is made of light but durable pipes, she was strong, it held the front fork well and allowed the use of a "trailer"” any type of engine. A change in this area was introduced by, among others. in. company Laurin & Klement, in which in 1899 a different solution was used in the year. Instead of adapting the motor to the bicycle frame, it was decided to build a frame for the power unit. This is how the frame of the new shape was created, encircling the engine, more typical of a motorcycle than a bicycle. Further "motorcycling."” the evolution of the frame was due to the abandonment of the pedals and the systematic enlargement of the fuel tank. Over time, some elements of the trapezoidal frame were eliminated, and their role was played by a rigid engine block or gearbox body.

The original solution was the frame of the German company Bekamo z 1922 year, made of two long and wide ash strips. Between the slats, reinforced sheet metal fittings, there was a fuel tank and an engine hanging. The frame of the English company Francis Barnett is made of straight pipe sections, connected to each other by screws, it was an extremely strong truss structure.

Tubular frames were built as single ones, double, closed, open etc.. The frame of the Czech Bóhmerland with an extensive "spatial" was exceptionally bizarre” tubular structure, almost 3 meters long.

Not every motorcycle had a tubular frame. The Krieger-Gnadig company constructed the frame from pressed steel elements. These were moldings with a C-profile and not too large cross-section, successfully replacing expensive seamless pipes. This concept was soon taken over by BMW companies, Zundapp, Victoria, ĆZ and others.

Designers' efforts, that the motorcycle can also achieve some of the positive properties of cars, carried out by the American company Ner-a-Car in the form of an unusual shape motorcycle chassis. It was a flat skeleton frame, known for its car design, forked at the front (to allow the wheel to turn), combined with a cladding that protects the driver from the vagaries of the weather.

The further development of motorcycles was also aimed at ensuring greater ride comfort, improving the performance of the vehicle and obtaining a more favorable aerodynamic silhouette (by adding covers, fairings, etc.). Basic shape and "exposed” (i.e.. it does not insulate it from the environment by the bodywork) the position of the motorcyclist remained, substantially, not changed until today.