Motorcycle rear suspension swingarm assembly

Motor vehicles – Special wheel base – Having only two wheels

Reexamination Certificate

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Reexamination Certificate



An off-road motorcycle incorporating a swingarm assembly for pivotally supporting a rear wheel relative to a main frame portion of the motorcycle. Preferably, the swingarm includes right and left arms extending rearwardly from a forward connecting portion. Right and left rear wheel mount members are secured to the right and left arms, respectively, to rotatably support the rear wheel of the motorcycle. Preferably, the arms from the swingarm assembly are formed at least partially by a hydroforming process wherein the center of the arms has a width that is greater than the width of either a forward or rearward end of the arm. In addition, the forward ends of each of the right end left arms are bent inward such that the forward portion of the swingarm assembly is narrower than the rear portion of the swingarm assembly. Desirably, the hydroforming process permits the inner wall of the arms to be vertical and substantially planar, even along the region where the arms are bent. In addition, a vibration absorbing coating is applied to the wheel support members in a manner to be interposed between an inner surface of the wheel support members and the outermost portion of a hub of the rear wheel.

patent: 4809802 (1989-03-01), Seino et al.
patent: 4887687 (1989-12-01), Asai et al.
patent: 4889205 (1989-12-01), Yoshimi
patent: 5361864 (1994-11-01), Tanaka
patent: 5782313 (1998-07-01), Kurawaki et al.
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patent: 6206398 (2001-03-01), Yanai et al.
patent: 6315071 (2001-11-01), Gogo
patent: 6427796 (2002-08-01), Tsutsumikoshi
patent: 6446748 (2002-09-01), Suzuki
patent: 6481523 (2002-11-01), Noro et al.
patent: 6508326 (2003-01-01), Kido et al.
patent: 6516910 (2003-02-01), Buell et al.


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