| 摘要 |
<p>A valve drive system of internal combustion engine which operates at a high compression ratio cycle, which is provided with an intake cam 52a and intake cam 52b for operating intake valves 7a, 7b and a variable valve timing device 70 which can offset the operating timings of the intake valves 7a, 7b by the intake cam 52a and the operating timings of the intake valves 7a, 7b by the intake cam 52b from each other. The intake cam 52a and intake cam 52b include circular parts and cam noses. At least one of the cam nose of the intake cam 52a and cam nose of the intake cam 52b has a concentric circular part which is formed in a circular shape concentric with the circular part.</p> |
