Engine that actively varies compression expansion ratio

Abstract

An engine that actively varies a compress expansion ratio may include an intake camshaft to which an intake cam may be formed to lift an intake valve, an exhaust camshaft to which an exhaust cam may be formed to lift an exhaust valve, an intake valve variable timing unit disposed at one end portion of the intake camshaft to advance or retard a rotation of the intake camshaft, an exhaust valve variable timing unit disposed at one end portion of the exhaust camshaft to advance or retard a rotation of the exhaust camshaft, an intake valve variable duration unit disposed at the other end portion of the intake camshaft to vary a lift duration of the intake camshaft, and an exhaust valve variable duration unit disposed at the other end portion of the exhaust camshaft to vary a lift duration of the exhaust camshaft.

Dependencies are inferred from the claim text.