| 摘要 |
PURPOSE:To simultaneously control the oil feed of a cam and the actuation of a connecting device by one operation by connecting the respective oil paths of cams for low speed and high speed and an oil path of a connecting device through orifices and switching the direction of circulating lubricating oil by a spool valve. CONSTITUTION:During medium-low speed operation of an engine, the first and second parts 44, 45 of a spool valve 42 are communicated with each other to introduce lubricating oil into the first end second oil paths 16, 17 through a variable orifice 43 and further simultaneously introduce same into an oil path 38 in a rocker shaft 8 through an orifice 50. At this time, the respective diameters of the orifices 48a, 49a positioned on the upstream side are set larger than those on the first oil path 16 side and the second oil path 17 side, so that a large quantity of lubricating oil is circulated by the first oil path 16 side to lubricate a cam for low speed with priority. On the other hand, during high speed operation, a solenoid 46 is excited to communicate the first and third ports 44, 47 with each other to supply oil pressure as it is to an oil pat//h 38, thereby driving a connecting device.
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