| 摘要 |
PURPOSE:To eliminate the problems of insufficient and excessive supply of oil by providing an oil passage communicated to an intake port and an oil passage communicated to the surrounding of a bearing part for a crank shaft, and by controlling a shut-off valve disposed in either one of the oil passage in accordance with the operating condition of an engine. CONSTITUTION:An oil pump 17 connected to an oil tank T and driven by a crank shaft 8 has a plurality of discharge ports 181, 182, the discharge port 181 being connected to a connecting cylinder part 5 in each carburetor 3 provided with a connecting pipe 4 communicated to an intake port 6 in an intake barrel 2, through a pipe line 19 so as to form a first oil passage 201, and the other discharge port 182 being communicated to the surrounding of a crank journal 9 and the like through an oil hole 21 formed in a crank case 1 or the like and a pipe line 22 so as to form a second oil passage 202. A solenoid shut- off valve 32 is disposed in the second oil passage 202, and is controlled by a control mechanism 33 in accordance with the operating condition of the engine. |
