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AssigneeMazda Motor Corporation
InventorsOsamu Sado, Kazuhiko Ueda, Noriyuki Iwata, Tatsuya Uesugi, Shunji Masuda
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A cylinder head for a double overhead camshaft engine, with a plurality of intake valves and a plurality of exhaust valves for each cylinder, is covered by a cylinder head cover to support, for rotation, intake and exhaust camshafts. A hermetically sealed chamber, formed between the cylinder head and head cover as an oil jacket, is divided into two chambers, enclosing major parts of the intake and exhaust camshafts, respectively, which are in communication with each other near first ends of the chambers. An outlet hole is formed in the cylinder head cover so as to permit blow-by gas to flow out of the chamber. A cover, covering a gear train for operationally coupling the intake and exhaust camshafts, is bolted to one end of the head cover at several points around the gear train and to the cylinder head.
A cylinder head structure for a double overhead camshaft engine, provided with a plurality of intake valves and a plurality of exhaust valves for each cylinder, the number of intake valves being different from the number of exhaust valves, the intake and exhaust valves being driven by intake and exhaust camshafts, respectively, said cylinder head structure comprising:
A cylinder head structure for a double overhead camshaft engine, comprising:
A cylinder head structure for a double overhead camshaft engine, comprising:
Dependencies are inferred from the claim text.