Yamaha Hatsudoki Kabushiki Kaisha

Yamaha Motor Company Ltd

Atsushi Matsuda

Toshiyuki Sato

Tashiyuki Sata

Steering arrangements for motorcycles herein the rear wheel is supported for steering movement and is mechanically coupled to the mechanism for steering the front wheel so that both wheels will be steered in unison. An arrangement is provided to adjust the steering ratio between the front and rear wheels in response either to vehicle load or an engine running condition.

Motorcycle having steered front and rear wheels with control for ratio

An embodiment of steering arrangement for motorcycles wherein the rear wheel is supported for steering movement and is mechanically coupled to the mechanism for steering the front wheel so that both wheels will be steered in unison. The rear wheel is driven by means of a shaft drive.

Rear wheel steering device for motorcycles

Two embodiments of steering arrangements for motorcycles wherein the rear wheel is supported for steering movement and is mechanically coupled by a positive linkage system to the mechanism for steering the front wheels so that both wheels will be steered in unison. In one embodiment of the invention, the positive linkage system includes irreversible gearing so that forces applied to the rear wheel will not effect its steering or steering of the front wheel.

Steering arrangements for motorcycles wherein the rear wheel is supported for steering movement and is mechanically coupled to the mechanism for steering the front wheel so that both wheels will be steered in unison. An arrangement is provided to adjust the steering ratio between the front and rear wheels to suit riding conditions and rider preference and a caster angle is chosen to minimize effective wheelbase changes under suspension travel.

Motorcycle having steered front and rear wheels

Two embodiments of steering arrangements for motorcycles wherein the rear wheel is supported for steering movement and is mechanically coupled to the mechanism for steering the front wheel so that both wheels will be steered in unison. In one embodiment, the front and rear wheels are steered in the same direction while in the other embodiment, they are steered in opposite directions.

Several embodiments of steering arrangement for the rear wheel of a motorcycle wherein the wheel is steered from the side opposite to that which is driven. In some embodiments, a cantilevered trailing arm is employed for suspending the rear wheel that extends only on the driven side and in other embodiments the trailing arm has a pair of arms that are spaced on opposite sides of the wheel. In some embodiments, a brake assembly is provided on the driven side of the rear wheel and in another embodiment, the brake is provided on the steered side of the rear wheel.

A steering mechanism for a motorcycle or the like wherein the front and rear wheels are steered in response to operator input steering of the front wheel. The steering ratio between the front and rear wheels changes in response to a vehicle condition such as the amount of steering of the front wheel.

A steering arrangement for motorcycles wherein the rear wheel is supported for steering movement and is mechanically coupled to the mechanism for steering the front wheel so that both wheels will be steered in unison. The mechanism includes means for limiting the steering movement of the rear wheel and disabling the rear wheel steering upon failure.

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Iwata, Japan

Atsushi Matsuda