| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil injection device configured to reduce variation of a flow rate of oil injected from an injection hole of an oil injection pipe irrespective of a bolt fastening state.SOLUTION: An oil injection device 18 includes an oil injection pipe 7 with an injection hole formed at a tip, a body 8 supporting a basal end of the oil injection pipe 7 so as to extend upward, and a bolt 9 penetrating the body 8 to fix it to a lower portion of a cylinder. Oil 6 is supplied through the bolt 9 to an annular flow path 10 formed in a penetrated portion through which the bolt 9 penetrates the body 8, and the oil 6 is supplied from the annular flow path 10 to the oil injection pipe 7 so as to be injected from the injection hole to a backside of a piston. A buffer section 19 expanding radially outward is formed at a connection position with the oil injection pipe 7 in the annular flow path 10. |
