| 摘要 |
The lower portion of the outdrive of a stern drive motor or of an outboard motor for boats, is further protected from damage on striking submerged objects. Protection at low speed is gained by providing sharp or knife-like edge formed of rubber on the leading of the lower portion to gain the resiliency to cushion from damage at low speeds. Lower portions are typically pivotally mounted with respect to the rest of the motor to enable trim adjustment by a cylinder and piston arrangement. The cylinder and piston arrangement provides some cushion enabling damage-reducing backwards and upwards limited rocking on impact at low moderate speeds. Impact sensing mechanisms conventionally also release the pressure in the cylinder and piston arrangement at low and low-moderate speeds but are generally ineffective at moderate and high speeds to limit damage. The effectiveness is improved by the rubber sharp edge on the lower unit which provides for some travel of the lower portion before it comes into rigid contact with the submerged object, providing time for the impact sensing mechanism to act. Impact damage at high speeds is minimized by the use of piston release mechanisms which allow the lower unit to rock freely of the cylinder and piston arrangement.
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