| 摘要 |
An internal combustion engine having a cylinder 16, a cylinder head 10, and a piston 12 slidably mounted within the cylinder for reciprocating movement towards and away from the cylinder head, together defining a reaction chamber 22. The piston and cylinder head include cooperating structure for inducing rotative movement in a fuel/air mixture within the cylinder before and after the combustion reaction. The structure comprises at least two projections 50, 51 rising upwardly from a top the surface of the piston and disposed symmetrically about a central axis in a side-by-side interfitting, "yin and yang" relationship. The projections are defined by respective inclined, lateral surfaces 50a, 51a that merge with horizontal surface portions 58, 59 of the piston, the horizontal extent of which taper from the base of the associated projection; the upper portion of the projections terminate in respective circular edge surfaces 56, 57. The cylinder head includes an inner peripheral wall 20 that forms at least a portion of the combustion chamber and defines complementary shaped recesses 52, 53 for receiving the respective piston projections 50, 51 when the piston is substantially at top dead center. The recesses have portions that are contoured substantially similar to the contour of the sloping projection surfaces 50a, 51a. When embodied on an internal combustion engine having poppet-type intake and exhaust valves, the valve heads 24, 26 of the valves define portions of the recesses.
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