| 摘要 |
<p>The invention relates to a piston engine comprising at least one cylinder (1 2), and a cylinder head (1 6) arranged in connection with the cylinder provided with at least one inlet valve (1 8) and at least one exhaust valve (20), a piston (14) arranged in the cylinder movably between its top dead center (TDC) and bottom dead center (BDC), in which the piston (14) is provided bowl (142) provided with rotationally symmetrical top surface in respect of the longitudinal axis thereof. The bowl (142) comprises a middle region (143), and radially after the middle region a conical region (144) extending radially towards the periphery of the piston at an angle (D) such that the depth of the bowl increases towards the periphery of the piston (14) and that the valves provided with a bottom surface comprising an extension (1 81, 201 ) which extends from a plane formed be the rim of the valve edge (1 82) to a direction opposite to the stem of the valve.</p> |
