| 摘要 |
<p>PURPOSE:To stably feed working oil to a variable valve timing mechanism which is fitted to one end of a camshaft and operated by hydraulic pressure, and improve responsiveness of the variable valve timing mechanism during cold start. CONSTITUTION:An oil passage 22 is laid in extension close to the exhaust ports of a cylinder head 1 in parallel with a camshaft 3. Working oil is fed to the oil passage 31 in the camshaft 3, from the oil passage 22 through a first journal part 5 located on the end part of the camshaft 3 on the variable valve timing mechanism 10 side and a second journal part 6 positioned toward the center part in the axial direction of the camshaft 3, and fed to the variable valve timing mechanism 10.</p> |
