| 摘要 |
<p>PURPOSE:To supply the required minimum quantity of lubricating oil to each lubricating oil path and to reduce an oil pressure supply source in size by providing lubricating oil paths for low speed and high speed, and disposing a control valve for throttling the quantity of lubricating oil during low-speed operation of an engine between each lubricating oil path and the oil pressure supply source. CONSTITUTION:During low-speed operation of an engine, a plunger 64 of a control valve 56 is placed at a position shown in the drawing and input and output ports 65, 66 are communicated with each other through a restriction 70, so that oil pressure from an oil pressure supply source 54 is throttled to be supplied to an oil pressure supply path 41. Oil pressure in the oil pressure supply path 41 is further throttled by a throttle 5 to be supplied to a lubricating oil path 26 for high speed, so that low-pressure lubricating oil is jetted from a jet pipe 28. Accordingly oil pressure in an oil pressure chamber 39 becomes low, so that switching pins 33-35 are returned by a return spring 36 to put rocker arms 7-9 in the state of disconnection. Oil pressure from the oil pressure supply source 54 is throttled by a restriction 71 to be supplied to a lubricating oil path 25 for low speed, and a small quantity of lubricating oil is jetted from a jet nozzle 27. During high-speed operation of the engine, a control valve 56 is adapted to limit the quantity of oil circulating between the oil pressure supply source and the lubricating oil path for low speed to the small quantity to be communicated with each other.</p> |
