| 摘要 |
<p>Pistons are described including a crown portion, gudgeon pin bosses (58) and a skirt portion, the skirt portion comprising thrust faces (70,72) which are joined at their outer extremities (66,68) by curved skirt wall members which include the gudgeon pin bosses characterised in that when viewed along the piston axis (64) towards the open, lower-end of the skirt portion, the skirt wall members present an oval form, at least from the lower external surface (56) of the gudgeon pin bosses (58) to the open lower extremity of the skirt. <IMAGE></p> |
