| 摘要 |
An oil supply structure for reducing friction of a cam shaft attached to a valve train of an automotive engine is disclosed. An oil supply hole formed in a cam shaft is, repeatedly connected and disconnected to a cylinder head oil supply hole during the rotation of the cam shaft. An oil pocket is established in the form of a concave groove in a section in the circumferential direction on an inner circumferential surface of a cam cap assembled on the top of the cam shaft so as to supply oil to the oil pocket only when the cylinder head oil supply hole is connected to the cam shaft oil supply hole. It is thus possible to supply oil to the oil pocket through the cam shaft oil supply hole at specific points of time and, simultaneously, to sufficiently ensure the sealing width in other regions than the oil pocket, thus reducing oil loss and obtaining a more efficient friction reduction.
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