| 摘要 |
PURPOSE:To secure the fitting space of an injector and improve combustion stability by disposing an intake port on one side of a cylinder head, and forming a recessed place on the upper face of a piston in order to promote intake air vortex flow. CONSTITUTION:An intake port 8a is provided, through an intake valve, on one side of a cylinder head with a plane FC, including a cylinder axis L along the center of a cylinder S, placed in between. A recessed place 24 presenting the downward protruding curved face from the orthogonal face view to an orthogonal line LH to the cylinder axis L within the plane FC is formed to promote intake air vortex flow TF around a parallel line LH1 to the orthogonal line LH. A raised part 23 is provided being raised gradually from the recessed place 24, with the crest 232 thereof coming close to the lower face of the cylinder head at the top dead center of a piston. The fitting space of an injector can be thereby secured easily, and combustion stability is improved.
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