Importance

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Abstract

In an outboard engine system, an inertia force a generated longitudinally by a piston 14 is countervailed by an inertia force b generated by a crankshaft 15, and inertia forces c and d subsidiarily laterally generated vibrate a body of the outboard engine system laterally about a phantom center point C of vibration. At this time, an elastomeric member 74 resiliently supporting the system body on a hull has a rigidity in a tangent direction (in the direction of L.sub.3) about the phantom center point C of vibration, which is set to be lower than a rigidity in a radial direction (in the direction of L.sub.2) about the phantom center point C of vibration. Therefore, the lateral vibration is reduced effectively due to the lower rigidity of the elastomeric member 74. Thrusts e and f generated by a propeller and acting in a longitudinal direction (in the direction of L.sub.1) are transmitted to the hull through the elastomeric member 74. However, the rigidity of the elastomeric member 74 in the longitudinal direction is set to be higher and hence, the thrusts e and f can be transmitted effectively to the hull.

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First Claim