| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve train structure for a high speed direct injection type diesel engine capable of realizing a DOHC type four valve train structure on a subminiature cylinder bore of a compact high speed direct injection type diesel engine. SOLUTION: This high speed direct injection type diesel engine directly injecting fuel at high speed into a small combustion chamber includes first and second camshafts with alternately arranged intake cams and exhaust cams mutually having relative displacements, and first and second intake valves and first and second exhaust valves opening and closing in association with the camshafts two intake ports and two exhaust ports formed on a combustion chamber upper part of a cylinder head. It features that the first intake valve operated by the intake cam of the first camshaft and the second exhaust valve operated by the exhaust cam of the second camshaft are adjacently arranged on center line of the combustion chamber in a camshaft longitudinal direction, and the first exhaust valve operated by the exhaust cam of the first camshaft and the second intake valve operated by the intake cam of the second camshaft are arranged separated from the center line of the combustion chamber in the camshaft longitudinal direction than the first intake valve and the second exhaust valve.
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