| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve gear capable of increasing lubricity between the journal part and the bearing of a rocking cam structure while reducing the size of an engine. SOLUTION: This rocking cam structure comprises a drive shaft 13 rotatingly driven by a crankshaft and having a drive cam formed on its outer periphery and a rocking cam structure 17 to which a rocking force is transmitted from the drive cam through a rocker arm and opening and closing an intake valve by the rocking force. A journal part 18a is formed at the center of the cylindrical member 18 of the rocking cam structure, and circular arc-shaped recessed parts 29b in which a part of the outer peripheral surface of each valve lifter 16 slides are formed on both sides of the pedestal 29 of a cylinder head 1 bearing the journal part. Further, a circular arc-shaped oil groove 30b to which a lubricating oil is fed through an oil passage 13a, a communication passage 13b, and an oil hole 18c is formed at the bearing surface 30a of a bearing bracket 30 fixed to the upper end part of the pedestal with bolts 31. COPYRIGHT: (C)2006,JPO&NCIPI
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