| 摘要 |
[PROBLEMS] To make a vibration damping mechanism configured to be easily taken in and out through an inlet for grease. [MEANS FOR SOLVING PROBLEMS] In an upper surface of a crank housing 5 is provided an inlet 21 for grease which is configured to be openable and closable by a cap 22. A vibration damping mechanism 25, which includes a counterweight 26 provided with a connecting pin 33 loosely fitted in a connecting hole 34 of an eccentric pin 12 when the cap 22 is attached, is mounted in the cap 22, whereby the vibration damping mechanism 25 is allowed to be taken in and out of the crank housing 5 through the inlet 21 by attachment and detachment of the cap 22 to and from the inlet 21. |
