| 摘要 |
PCT No. PCT/GB86/00103 Sec. 371 Date Dec. 8, 1986 Sec. 102(e) Date Dec. 8, 1986 PCT Filed Feb. 27, 1986 PCT Pub. No. WO86/05249 PCT Pub. Date Sep. 12, 1986.A piston has skirt portions (13) which are provided with parallel rows (14) of cavities (15) whose maximum depth below the surface of the skirt portion is 0.010 mm. Parts (20,23) of the skirt portion are left between the cavities for providing a reduced area, in comparison with the full skirt portion, for the transmission to an associated cylinder or liner of lateral loads; this reduced area reducing the frictional losses. The cavities (15) hold lubricating oil and provide a cushion of oil which supplies oil to the reduced bearing areas and which tends to resist lateral movement of the piston at top and bottom dead center, so reducing or eliminating "piston slap". |
