| 摘要 |
<p>The invention relates to a cylinder head (1) for an internal combustion engine provided with an asymmetrical overhead valve layout. The axes (2c, 3c) of the inlet and exhaust valves (2, 3) form the sides of an inverted triangle, the inverted base (5) of which spans the upper ends of the valve stems (2b, 3b) and intersects locations at which the valve-actuating forces are applied to the valve stems or their associated actuating elements. The inverted base (5) defines an included angle (α) of about 90° or more with the exhaust valve axis (3c). The ratio (L:1) between the axial lengths of the inlet and exhaust valves is about 1.40:1 or more. The ratio (D:d) between the diameters of the inlet and exhaust valve heads (2a, 3a) is about 1.30:1 or more.</p> |
