| 摘要 |
PURPOSE:To reduce the weight of a crankshaft without hindrance to its strength by providing a main shaft with a through hole extended in the longitudinal direction and fitting a pipe between a journal portion of the main shaft and a crank pin by pressure. CONSTITUTION:A main shaft 11 and a through hole 10a extended in the longitudinal direction of the main shaft 11 are concentrically formed on a crankshaft 10 and a balance weight 12 respectively. A plurality of fixing holes 10b coaxially extended through the through hole 10a and the balance weight 12 are formed between each journal portion 11a and each crank pin 13. One end of each fixing hole 10b is opened to the outer periphery of each journal portion 11a, the other end thereof being opened to the outer periphery of each crank pin 13. Each pipe 14 forming an oil supply path is fitted in each fixing hole 10b by a pressure. |
