| 摘要 |
A motorcycle chassis embodies novel techniques, geometries and configurations in order to enhance performance. A mechanical arrangement is implemented to impose steering of front and rear wheels simultaneously for quicker steering response and maneuverability. The rear wheel steers at a smaller but proportional angle to that of the front, in the same direction. This allows a quicker roll rate when a turn is initiated. New techniques stabilize vehicle motion characteristics. A first is improved elevation attitude stability is achieved by the employment of anti-drive and anti-squat suspension control geometry to give essentially flat (elevation) attitude during acceleration and/or deceleration. A second is continuity of tire/pavement contact during acceleration and/or deceleration is further improved through use of a longer than normal wheel base and lower center of gravity. The longer wheel base does not compromise steering response of the proposed vehicle configuration when the two wheel steering feature described above is in place. A third is a low center of gravity is achieved by an arrangement that carries the fuel load within the chassis structure, below the engine. Better roll and yaw steering stability is achieved through an extremely rigid chassis, a product of the monocoque frame structure configured. Reduced dynamic flex minimizes the disconcerting tendency toward chassis self-steering over wavy pavement. A passive closed-loop suspension damping control mechanism is employed for better road holding characteristics. This unique sub-system exhibits progressive damping of shock absorbers, where rebound damping force is made proportional to (instantaneous) spring force provided by pneumatic springs. Damping rate is tunable in real time through the use of adjuster knobs accessible to the rider.
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