Yamaha Hatsudoki Kabushiki Kaisha

Toyoji Tanaka

Ichiro Kurawaki

Kazumasa Nakaya

A rear suspension unit for cushioning the suspension travel of a trailing arm rear wheel suspension for a motorcycle. The cushioning unit is a telescopic unit that is disposed beneath the frame and extends in a generally horizontal direction. At least a portion of the system unit is mounted beneath the frame and the crankcase transmission assembly of the motorcycle, to provide a compact and yet serviceable assembly.

Motorcycle suspension system

The present invention is adapted to be embodied in a steering and suspension arrangement for the front wheel of a motorcycle. Specifically, the invention relates to a front wheel swing arm type steering and suspension arrangement. In the arrangement of the present invention, upper and lower swing arms connect a motorcycle frame to a steering knuckle which extends along one side of the front wheel. The upper swing arm is shorter in length than the lower swing arm and is pivotally connected to the frame of the motorcycle at a point forwardly of a pivotal connection for the lower swing arm. According to the invention, the swing arms are positioned so that forwards and backwards lateral movement of the suspension system is kept to a minimum and the rake angle of the steering arrangement is held nearly constant during suspension travel, as when the motorcycle encounters a bump during operation. The swing arm suspension arrangement of the invention is compact and allows for good maneuverability of the motorcycle and also for easy access to the engine, as for repairs. A telescoping tube assembly having a pair of elongated tubes reciprocal within associated bores, for absorbing the swing motion of the suspension arrangement, also comprises a portion of the steering arrangement of the invention.

Double swing arm motorcycle front suspension

Several embodiments of fully adjustable motorcycles so as to permit the use of a single motorcycle as either a touring or racing machine. The handlebar assembly is adjustable along an arc as are the foot pegs with the center of movement of the arc being midway disposed between the handlebar and the foot pegs. This permits the rider to assume either an upright touring position, or a reclined, crouched racing position. The seat is also adjustable and the adjustment further accommodates riders of varying stature.

Fully adjustable motorcycle

The present invention is adapted to be embodied in a steering and suspension arrangement for the front wheel of a motorcycle. Specifically, the invention relates to a front wheel swing arm type steering and suspension arrangement. In the arrangement of the present invention, upper and lower swing arms connect a motorcycle frame to a steering knuckle which extends along one side of the front wheel. The invention provides means for adjusting the relative lateral positioning between the steering knuckle and the upper swing arm for suspension tuning. The invention also provides a relative positioning arrangement between the upper swing arm and the steering knuckle which minimizes forwards and backwards lateral movement of the suspension arrangement when the swing arms are moved up and down, as when the motorcycle encounters a bump during operation.

Front wheel suspension for motorcycle

A motorcycle front wheel and disc brake assembly wherein the caliper of the disc brake assembly is supported directly by an axle carrier of the front wheel and is nested between the axle carrier and the front wheel. The caliper assembly is mounted centrally on the axle carrier so as to minimize the length of its supporting bracket and to reduce adverse effects on the suspension and steering of the front wheel.

Motorcycle front wheel disc brake arrangement

A motorcycle having leading and trailing front and rear arm suspensions for the front and rear wheels. The motorcycle has a frame that is made up of a pair of side pieces that are integrally connected with each other with portions of the side pieces removeable for accessing and removal of the engine.

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Iwata, Japan

Toyoji Tanaka