| 摘要 |
Disclosed herein is a lower unit for a marine propulsion device, such as an outboard motor or a stern drive unit, which lower unit comprising a gear case including a torpedo having a fore and aft axis and including a forward portion, a central portion extending rearwardly from the forward portion and having a generally cylindrical configuration concentric with the axis and defined by a radius, and an aft portion extending rearwardly from the central portion and including a circumferentially extending cylindrical sub-portion which is concentric with the axis, and which is defined by the radius, and a circumferentially extending conical sub-portion which is concentric with the axis, which extends for a circumferential length of not more than 180 degrees, and which is defined by radii which are greater than the radius and which gradually increase in the direction toward the aft end.
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