Rear suspension system for motorcycles

Claim 1

In a rear suspension system for motorcycles comprising a chassis frame of said motorcycle, a rear wheel, a member supporting said rear wheel at its rear end and pivotally connected to said chassis frame at its front end in such a manner as to permit oscillation thereof in upward and downward directions, a damper having one end connected to said chassis frame, a first link connecting the other end of said damper to said rear wheel supporting member, and a second link connecting said first link to said chassis frame, the improvement wherein: said first link is arranged such that a longitudinal axis of said first link at its side extends substantially in a vertical direction; said first link and said second link are arranged such that a line led from a first connecting part (O) between said chassis frame and said rear wheel supporting member to a second connecting part (C) between said first link and said rear wheel supporting member is substantially parallel at its side with another line led from a third connecting part (A) between said chassis frame and said second link to a fourth connecting part (B) between said first and second links; said damper, said first link and said second link are disposed above a line extending between said first connecting part and the rear end of said rear wheel supporting member; said damper is pivotally connected at the front end thereof to said chassis frame, extends rearwardly downwardly, and is pivotally connected at the rear end thereof to the upper end of said first link at a fifth connecting part (D); said second link is pivotally connected at the front end thereof to said chassis frame at said third connecting part, and is pivotally connected at the rear end thereof to a substantially intermediate part of said first link at said fourth connecting part; and said first link is pivotally connected at the lower end thereof to said rear fork at said second connecting part.