| 摘要 |
<p>PURPOSE: An engine with a variable compression-expansion ratio is provided to improve charging efficiency by applying a continuously variable valve timing unit and a variable valve duration unit to an intake cam shaft and an exhaust cam shaft at the same time. CONSTITUTION: An engine with a variable compression-expansion ratio comprises an intake cam shaft(120), an exhaust cam shaft(130), an intake vale variable timing unit(100), an exhaust valve variable timing unit(110), an intake vale variable duration unit(140), and an exhaust valve variable duration unit(150). The intake cam shaft comprises an intake cam which lifts an intake valve. The exhaust cam shaft comprises an exhaust cam which lifts an exhaust valve. The intake valve variable timing unit is mounted on one end of the intake cam shaft, and recognizes the rotation of the intake cam shaft. The exhaust valve variable timing unit is mounted on one end of the exhaust cam shaft, and recognizes the rotation of the exhaust cam shaft. The intake valve variable duration unit is mounted on the other end of the intake cam shaft, and changes the speed of the lift duration of the intake cam shaft. The exhaust valve variable duration unit is mounted on the other end of the exhaust cam shaft, and changes the speed of the lift duration of the exhaust cam shaft.</p> |
