To provide a lubricating device for a double link type piston crank mechanism in an internal combustion engine suitable for improving lubricity of a connecting part of an upper pin and an upper link.
This lubricating device for the double link type piston crank mechanism in the internal combustion engine is provided with an oil jet 30 jetting lubricating oil from a lower side toward a boss part 5 of another end of the upper link 5 in a down stroke from a top dead center of a piston 3. An oil hole 21 as an introduction passage introducing lubricating oil jet from the oil jet 30 to a bearing fitting part with the upper pin 6 is formed at the boss part 5A of another end of the upper link 5. Lubricating oil jet from the oil jet 30 is introduced to the bearing fitting part with the upper pin 6 via the introduction passage provided at the boss part 5A of the upper link 5 in the down stroke of the piston 3.
| JPH02298631 | INTERNAL COMBUSTION ENGINE |
| JP5923801 | Improved assembly |
| JP5115644 | Variable compression ratio internal combustion engine |
AOYAMA SHUNICHI
USHIJIMA KENJI
Masahiro Fujii
Yasunari Mita
Masaaki Iida