| 摘要 |
A lower cam carrier (20) is disposed over a cylinder head (10) and a head cover (40) is disposed thereover. The lower cam carrier (20) has, formed as one therewith, an outer frame (22) superposed with the edge peripheral edge (14) of the cylinder head (10), and a bridging part (26) provided between opposing sides of the outer frame (22). The bridging part (26) has a lower bearing (28) for supporting an intake camshaft (30) and an exhaust camshaft (32). The head cover (40) has, formed as one therewith, a flange (42) superposed with the outer frame (22) and a bearing (46) opposing the bridging part (26) inside the flange (42). The bearing (46) has an upper bearing that, together with the lower bearing, supports the intake camshaft (30) and the exhaust camshaft (32).
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