| 摘要 |
PURPOSE:To moderate required accuracy of the bore of the insert hole of an oil pipe so as to ease processing, and to enable the oil pipe to be certainly fitted by fitting the oil pipe to the crank part by using an abundant radial margin of a spring pin. CONSTITUTION:An insert hole 26 for a spring pin 24 is formed on the upper end part of an oil pipe 21 made of plastic or the like. First, one end of the spring pin 24 is pressingly inserted into the insert hole 27 of the lower end part of the crank part 6 of a cranks shaft 5. And, then, the oil pipe 21 is fitted by pressingly inserting the other end part of the pin 24, into the spring pin insert hole 26.
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