| 摘要 |
PURPOSE:To have sure feed of lubricating oil to all necessary parts by locating the discharge hole for the lubricating oil at a position just over the suction path in the downstream of suction line in the neighborhood of the throttle valve's arrangement location of the carburettor. CONSTITUTION:When a throttle valve 23 opens a little in the low speed range of engine operation, minor openings are formed in the suction line 25 at its areas above and below the throttle valve 23, and a high-speed air stream is generated approx. over the suction line at its suctional downstream in the neighborhood of the throttle valve 23 facing the discharge hole 35 for lubricating oil. The lubricating oil emitted out of this discharge hole 35 drops now in said high- speed air stream in spattered condition, and atomization and mixing into the mixture gas is promoted. In the middle and high-speed operation ranges, on the other hand, the flow speed of the mixture gas in the suction line 25 of the carburettor 18 is fast to ensure promotion of mixing-in in the same manner, so that the lubricating oil is supplied surely to each part of the engine. |
