| 摘要 |
<p>PURPOSE:To enhance the heat-exchanging efficiency so as to enhance the cooling efficiency by providing such an arrangement that air after heat-exchange in a heat-exchanger such as an oil cooler or the like is led into a muffler through an air pipe, and an exhaust gas stream is led through accelerating passages formed in the muffler so as to enhance the introduction efficiency of air. CONSTITUTION:During operation of an engine 1 air is introduced into an oil cooler 2 and an oil pan 3 through intake-air ports respectively formed therein, so as to perform heat-exchange between air and oil. Air after heat-exchange is led through air pipe lines 6, 7 and is introduced into a muffler 5 through introduction pipes 8, 9. In this arrangement an orifice part 26' is provided in the inlet port of an exhaust passage 26 in the muffler 5, and a cylindrical body 27 communicated with the introduction pipes 8, 9 is provided at the center of the muffler so as to form accelerating passages S1, S2. With this arrangement, an exhaust gas stream is led through the accelerating passages S1, S2 so as to allow a negative pressure to act upon the discharge port 28 of the cylindrical body 27, thereby it is possible to suck air into the cylindrical body 27 through the introduction pipes 8, 9.</p> |
