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Difference between revisions of "BMW Paralever"
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The '''BMW Paralever''' is a [[suspension]] system introduced by [[BMW]] in 1988. | |||
==Introduction== | ==Introduction== | ||
The Paralever suspension was introduced on the [[BMW R80GS|1988 R80GS]] and [[BMW R100GS|R100GS]], then used on the 4-valve K and Oilhead bikes (except the [[BMW R1200C|R1200C]]). Whereas the original [[Monolever]] system had a single pivot at the front of the [[swingarm]], like most [[motorcycles]], the Paralever uses two links to connect the rear drive to the transmission. This is a "Four-bar" linkage, similar to double-wishbone suspension in cars which keeps the rear drive at a constant angle as the suspension moves. In fact, there are several similarities between the two that can be explored. | The Paralever suspension was introduced on the [[BMW R80GS|1988 R80GS]] and [[BMW R100GS|R100GS]], then used on the 4-valve K and Oilhead bikes (except the [[BMW R1200C|R1200C]]). Whereas the original [[Monolever]] system had a single pivot at the front of the [[swingarm]], like most [[motorcycles]], the Paralever uses two links to connect the rear drive to the transmission. This is a "Four-bar" linkage, similar to double-wishbone suspension in cars which keeps the rear drive at a constant angle as the suspension moves. In fact, there are several similarities between the two that can be explored. | ||
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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. | |||
==Operational Forces== | |||
Refer to the diagrams below while we look at the basic concept: with the Monolever design, you can see that as the rear drive moves vertically, it rotates. | |||
[[Image:Diagrams.gif]{{clear}} | |||
[[Category:Suspension system]] | [[Category:Suspension system]] | ||