| 摘要 |
An embodiment of the invention provides a cylinder head 130 for an internal combustion engine, the cylinder head comprising a valve spring boss 530, the valve spring boss having a central opening 531 for accommodating a valve (215, fig.2) and having a contact area 532 for retaining said valve, wherein the contact area has a first portion(533, fig.4) and a second portion (534, fig.4), the first portion being ring-shaped and delimited by the opening and the second portion radially protruding from the first portion. There are preferably three or four protrusions equally spaced along the circumference of the first portion. A valve spring boss of this type allows a reduction in the whole volume and mass of the boss and could be half the weight of known cylinder head bosses. |
