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Difference between revisions of "Motorcycle chassis"
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==Frame Types== | ==Frame Types== | ||
Modern frames on standard production motorcycles can be grouped into three basic types: tube, pressed steel and monocoque. Tube frames are historically the oldest and now the most common. Tube frames are inexpensive to manufacture yet are light weight and offer good strength and high stability at highway cruising speed. Like bicycle frames, tubed frames come in welded and "tube and lug" varieties. The welded frame is self-explanatory. The tube and lug variety fits the tubes into manufactured joints, much like a tinker toy. | Modern frames on standard production motorcycles can be grouped into three basic types: tube, [[pressed steel]] and monocoque. Tube frames are historically the oldest and now the most common. Tube frames are inexpensive to manufacture yet are light weight and offer good strength and high stability at highway cruising speed. Like bicycle frames, tubed frames come in welded and "tube and lug" varieties. The welded frame is self-explanatory. The tube and lug variety fits the tubes into manufactured joints, much like a tinker toy. | ||
Frames may be either "cradle" or "spine" designs. In the cradle design, single or double downtubes support the engine in the classic bicycle "diamond" design. In a spine design, the engine literally hangs down from the frame. | Frames may be either "cradle" or "spine" designs. In the cradle design, single or double downtubes support the engine in the classic bicycle "diamond" design. In a spine design, the engine literally hangs down from the frame. | ||
Pressed steel or fabricated sheet metal has been used to create "backbone" frames. These frames consist of stamped sheet metal that is welded together, as shown in the accompanying figure. It is econom-ical, but heavier and less rigid than tube designs. This makes the pressed steel frame ideal for small, inexpensive motorcycles. Although through extensive engineering and use of modern materials, pressed steel frames are also well suited for larger applications. | Pressed steel or fabricated sheet metal has been used to create "backbone" frames. These frames consist of stamped sheet metal that is welded together, as shown in the accompanying figure. It is econom-ical, but heavier and less rigid than tube designs. This makes the [[pressed steel]] frame ideal for small, inexpensive motorcycles. Although through extensive engineering and use of modern materials, [[pressed steel]] frames are also well suited for larger applications. | ||
===Pressed frame=== | ===Pressed frame=== | ||
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===[[Monocoque]]=== | ===[[Monocoque]]=== | ||
Monocoque frames are an extension of the pressed steel frame. Monocoque frames incorporate many bike components (e.g., fuel tank, rear fender, seat pedestal, engine mount) into cast sections that com-prise the frame structure. Scooters are the classic example. | Monocoque frames are an extension of the [[pressed steel]] frame. Monocoque frames incorporate many bike components (e.g., fuel tank, rear fender, seat pedestal, engine mount) into cast sections that com-prise the frame structure. Scooters are the classic example. | ||
Supports structural load using the external skin of the frame. | Supports structural load using the external skin of the frame. | ||