Lubrication structure in OHC engine

A lubrication structure in an OHC engine having a cylinder head, a head cover connected to the cylinder head, a valve operation chamber formed between the cylinder head and the head cover, an intake valve, an exhaust valve, a crankshaft, and a crankcase, the lubricating structure comprising:

• a valve operation system housed in the valve operation chamber, the valve operation system comprising a valve-operating cam rotatably supported by the cylinder head and is cooperatively connected to the intake valve and the exhaust valve;
• and
• timing transmitting means disposed between the valve operation system and the crankshaft, the timing transmitting means comprising a driven wheel rotating together with the valve-operating cam and a transmission belt wrapped around the driven wheel, wherein oil within the crankcase, is carried by the transmission belt and is supplied to the valve operation chamber;
• wherein the head cover includes an arc-form curved cover part for covering the upper part of the driven wheel;
• wherein the curved cover part integrally comprises above the driven wheel a plurality of oil splashing ribs positioned at intervals along the rotational direction of the driven wheel projecting toward the side that is closer to the transmission belt;
• and
• wherein each of the oil splashing ribs is integral with the curved cover part and extends in a direction orthogonal to the rotational direction of the driven wheel, thereby reinforcing said head cover.