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Difference between revisions of "BMW Paralever"
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Let's be clear on some terms I'll use here. The "rear drive" is the bevel-gear containing casting that is at the end of the swingarm; it contains the flange that the wheel bolts up to. Whenever I refer to "rotation", I am specifically referring to the rotation, or angular change in position, of the rear drive unit as the suspension moves up and down. The wheel rotates while you ride but that's not important, and the Paralever links rotate around their end points also, but don't let that distract you. We are only concerned with the change in the angle of the rear drive unit (shown as a circle in the wireframe diagrams). | Let's be clear on some terms I'll use here. The "rear drive" is the bevel-gear containing casting that is at the end of the swingarm; it contains the flange that the wheel bolts up to. Whenever I refer to "rotation", I am specifically referring to the rotation, or angular change in position, of the rear drive unit as the suspension moves up and down. The wheel rotates while you ride but that's not important, and the Paralever links rotate around their end points also, but don't let that distract you. We are only concerned with the change in the angle of the rear drive unit (shown as a circle in the wireframe diagrams). | ||
Also, I will mention the forces acting on the rear drive: there is a road force (pushes forward on the tire's contact patch during acceleration) and this is balanced by the inertial force of the bike which pushes backwards at the swingarm pivot. These two forces, since they are not directly opposing each other, create a twisting force or torque in the swingarm/drive/wheel assembly that we're looking at. | Also, I will mention the forces acting on the rear drive: there is a road force (pushes forward on the tire's [[contact patch]] during acceleration) and this is balanced by the inertial force of the bike which pushes backwards at the swingarm pivot. These two forces, since they are not directly opposing each other, create a twisting force or torque in the swingarm/drive/wheel assembly that we're looking at. | ||
[[Image:Torque.gif]]{{clear}} | [[Image:Torque.gif]]{{clear}} | ||
Lastly, it's worth keeping in mind that most of my diagrams portray the two Paralever links as being parallel and of equal length. This isn't exactly correct, but making this assumption clarifies the difference. At the end I'll show how the actual geometry differs. | Lastly, it's worth keeping in mind that most of my diagrams portray the two Paralever links as being parallel and of equal length. This isn't exactly correct, but making this assumption clarifies the difference. At the end I'll show how the actual geometry differs. | ||