| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a well-balance weight arrangement structure for a balance weight, for a crank shaft of a straight-three engine type internal combustion engine. <P>SOLUTION: First and third cylinders on both sides, among three cylinders, are provided with a balance weight 25. A distance E2 between outside surfaces in the crank shaft direction of a pair of crank webs 23 on both sides of a crank pin 21 of a second cylinder is set shorter than distances E1 and E3 between outside surfaces in the crank shaft direction of the pair of crank webs 23, positioned on both sides of crank pins 21 of the first and third cylinders. Axial dimensions D3 and D4 of the crank webs 23 positioned on body sides of the crank pin 21 of the second cylinder are smaller than axial direction dimensions D1, D2, D5, and D6 of the crank webs 23 positioned on both sides of the crank pins 21 of the first and third cylinders. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
