| 摘要 |
FIELD: engines and pumps. ^ SUBSTANCE: proposed engine comprises main piston 20 and external piston 30 to make dual piston arranged in cylinder block 10. External piston is fitted on main piston 20. Crankshaft 18 is arranged at cylinder block bottom. Two lateral con-rods 35 couple external piston 30 with crankshaft to make external piston 30 displace together with main piston 20 in up and down strokes. Crankshaft 18 has heart-shape slots on both sides to couple it with said lateral con-rods 35. Every said slot is made up of longer annular slot 41 and shorter annular slots 42A, 42B. ^ EFFECT: advanced air intake and release shut-off, ruled out air-fuel leaks. ^ 8 cl, 13 dwg |
