| 摘要 |
PURPOSE:To smoothly return a predetermined amount of a blow-bye gas leaking within the engin to the suction pipe side and to miniaturize and stabilize the device by narrowing a flowpath of the blow-bye gas when the engine rotates at a high speed, on one hand, and widening the flowpath when the engine rotates at a low speed, on another. CONSTITUTION:When the engine starts to rotate at high speed, the negative pessure on the suction pipe side increases, and acts on a diaphragm 6 through the outlet passage 4 of a circulating device A. Thus, the diaphragm 6 is heavily sucked up to close the inlet end of the outlet passage 4 so that the blow-bye gas which has entered the circulation device A from a through hole Ca of a head cover C, mainly passes through a small- diameter orifice 5 formed in a central diaphragm 1b and flows into a suction pipe via an outlet passage 4. On the other hand, when the engine rotates at low speed at which the negative pressure of the suction pipe is small, the blow-bye gas which has entered into the inlet passage 3 pushes up the diaphragm 6, and the upper opening end of the outlet passage 4 is opened. The most part of the blow-bye gas enters into the outlet passage 4 via the above described opening end and flows on the suction pipe side. |
