| 摘要 |
PURPOSE:To maintain the compression ratio to a high degree and reduce the fuel consumption rate by communicating the escape portions on the upper surface of a piston provided in correspondence to a pair of suction valves of a main combustion chamber with an injection hole of a turbulence chamber by means an induction groove provided on the upper surface of the piston. CONSTITUTION:A pair of suction valves 7 and 7 and an exhaust valve 8 are provided at a cylinder head 3. The escape portions 9 and 9 on the upper surface of the piston 1 provided in correspondence to the suction valves 7 and 7 are communicated with the injection hole 6 of the turbulence chamber 5 by means of an induction groove 11 provided on the upper surface of the piston. The escape portions 9 of the left and right suction valves 7 concurrently use combustion cavities, and hence a high output can be maintained and the fuel consumption rate can be reduced without substantially decreasing the compression ratio. |
