| 摘要 |
<p>Pistons are described comprising a crown portion (11) which also includes a piston ring belt and gudgeon-pin bosses (18) and which crown portion comprises a ferrous alloy and a separate articulated skirt portion (12) which also includes gudgeon-pin bores (28,31,44,55) the crown portion and the skirt portion having a common gudgeon-pin wherein at least part of the skirt portion surfaces which co-operate with an associated cylinder or cylinder liner comprise a material selected from the group comprising aluminium alloys, plastics material and coated steel or cast iron.</p><p>Examples are given of pistons having die-cast aluminium alloy skirts and skirts fabricated from sheet or strip metal. </p> |
