| 摘要 |
PURPOSE:To enable the working of an oil passage to be processed easily and accurately by letting a plurality of crank pins arranged in phase be formed with the oil passage which is in parallel with a crank shaft in such a way as to become gradually smaller in diameter toward one direction. CONSTITUTION:An engine 17 is provided with each cylinder 23... on the front and upper sections of a crank case in a V shape configuration wherein each ellipse piston 21 and 22 is housed in a plurality of cylinder chambers 19 and 20. In this case, a plurality of crank pins 60 through 63 is formed with oil passages 66 in a step form which are in parallel with a crank shaft 26 respectively. Inner stepped holes 66B and 66E in the oil passages 66 are formed with a plurality of oil feeding holes 67 in the radial direction so as to be communicated with feeding passages 68 formed on the crank shaft 26. And each stepped hole 66A and 66C opening on the end of each crank pin 60 through 63 and the inner stepped hole 66B are provided with their own grommets 69, and each basin chamber 70 is formed in the inside of respective crank pins 60 through 63.
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