| 摘要 |
PURPOSE:To prevent condensation of oil and water inside a breather passage by providing a breather passage heating means in the breather passage in a system connecting a crank case to a combustion chamber through at least the breather passage, an air intake passage and an air and fuel mixing chamber in sequence. CONSTITUTION:A crank case 2 formed on the lower part inside an engine 1 is connected through to the inside space of a heat cover 10 fixed on the upper side part of the engine 1, and the inside space of the head cover 10 is connected through to an air inlet passage 4 through a breather pipe 3. The air inlet passage 4 is connected through to a combustion chamber 6 of the engine 1 through an air inlet heater 9 and an air and fuel mixing chamber 5. In this case, the breather pipe 3 is divided into a summer circuit 3a and a winter circuit 3b connected to each other in parallel in the middle, and a heater 7 is provided on the winter circuit 3b to heat it. And each of the circuits 3a, 3b is made to be alternatively changed over and used with a three way valve 11 provided on its upstream branching part. |
