| 摘要 |
A light-alloy control piston on its outer circumferential surface has hairline gaps locally passing through the piston wall which, for example, divide areas of the piston head from those of the skirt. Oil, which influences and in certain areas diverts the heat flow on the piston, is retained in the hairline gaps by capillary action.Furthermore the ignition pressure is positively transmitted from the head to the skirt by way of this oil cushion. When casting a steel lining (annular strip, plates etc), for example, into a light alloy piston, a hairline gap is produced between the two different materials. It is also possible, however, to create a metal bonding between these materials on one or both sides, for example by alfinising. With complete metal bonding a skirt/head separation can be produced in accordance with Fig. 8 (separate hairline gap). <IMAGE>
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