| 摘要 |
PURPOSE:To restrain plate smoke from being produced during start so as to aim at making a piston miniature and lightweight, by fitting and securing a combustion chamber bowl made of heat-resistant and pressure-proof metal materials in a fitting hole formed in a piston body, in a non-contact condition. CONSTITUTION:A fitting and securing part 14 is formed in the inner peripheral wall 13 of a bowl fitting hole 7 formed in the piston head 6 of a piston body 1. A combustion chamber bowl 8 made of heat-resistant and pressure-proof metal material is fitted and secured in the hole 7 in a non-contact condition, and the attaching peripheral wall part 11 of the bowl 8 is secured in the fitting and securing part 14 of the hole 17. With this arrangement, it is possible to make the wall thickness of the combustion chamber bowl 8 with and to reduce the thermal capacity thereof, thereby it is possible to restrain pale smoke from being produced during start so that the piston may be made to be miniature and lightweight. |
