VALVE SYSTEM FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To prevent abrasion about coupling pins connecting oscillating cams and link rods, by improving lubricating performance about the coupling pins and reducing their sliding resistance. SOLUTION: The valve system for internal combustion engines includes a driving shaft mounted with a driving cam 15 on the periphery, and oscillating cams 17 supported for oscillating motion on the driving shaft via a sleeve and provided with cam bodies 17a for opening/closing intake valves 12. The oscillating cams 17 have a bracket element integral with one end of the sleeve, and the sleeve has an arc cutout 46 formed in the periphery through a generally straight angle between the oscillating cams 17 and the bracket element. The cutout 46 is directed to a coupling pin 28 connecting one cam body 17a and a link rod 25, so that it faces up to hold lubricating oil therein and store it temporarily when cam noses 21 of the cam bodies 17a are in a fully driven-up oscillation position, and forces the lubricating oil to drop onto the opposed coupling pin 28 and thereabout when the cam noses 21 are in a lowered position.