| 摘要 |
PURPOSE:To prevent knocking engenderment between a piston and a cylinder by supplying lubricating oil all around the piston in such a way of providing guide grooves for supplying lubricating oil all around the piston. CONSTITUTION:A piston pin 3 inserted into a piston rod 14 is provided in a piston 2 which slides in a cylinder 1. This pin 3 is made into a hollow shape, at the same time, a cylindrical material 4 having a gap 5 is inserted into its hollow part. And this gap 5 is conducted through a passage 17 formed in the rod 14 to a crank chamber 20, at the same time, further it is conducted through passages 6, 7, 10 to guide grooves for lubricating oil formed on the surface around the outside of the piston 2. Therefore, lubricating oil in the crank chamber 20 is supplied through the passage 17, gap 5, passages 6, 7, 10, 11 and the guide grooves 12 onto all the periphery of the piston. |
