| 主权项 |
1. An internal combustion engine comprising;
a cylinder block comprising a cylinder bore within which a piston reciprocates along a central axis: a cylinder head assembled to the cylinder block in covering relation to an axial end of the cylinder bore and comprising an inlet port to the cylinder bore; a first intake valve and a second intake valve arranged side-by-side in the cylinder head for motion along a first intake valve axis and along a second intake valve axis respectively to open and close the inlet port to the cylinder bore, the first intake valve comprising a first intake valve head, and the second intake valve comprising a second intake valve head; the cylinder head comprising a first intake valve seat against which the first intake valve head seats when closing the inlet port to the cylinder bore and a second intake valve seat against which the second intake valve head seats when closing the inlet port to the cylinder bore; an actuator for opening and closing the first intake valve and the second intake valve in unison to unseat and re-seat the first intake valve head from and on the first intake valve seat and to unseat and re-seat the second intake valve head from and on the second intake valve seat; wherein the first intake valve axis is non-parallel to the cylinder bore axis, and the first intake valve seat is disposed in a plane which is non-parallel to a plane which is perpendicular to the cylinder bore axis; and wherein the first intake valve seat has a first semi-circumference, the second intake valve seat has a second semi-circumference, the first semi-circumference and the second semi-circumference are toward each other as viewed along the cylinder bore axis, and at least a portion of the first semi-circumference is closer, as measured along a direction parallel to the cylinder bore axis, to a plane passing through the piston perpendicular to the cylinder bore axis than is the second semi-circumference as measured along a direction parallel to the cylinder bore axis. |
