To provide a damper mass connected to a vibrator through a spring and light and easy to handle in transportation.
The damper mass includes: a hollow mass body 5 provided with a filling opening 51 opened in the top surface; and a seal cap 6 for sealing the filling opening 51 while filling liquid inside the mass body 5 through the filling opening 51. The seal cap 6 has a cap body 61 to be screwed into the filling opening 51 and a protrusion 63 provided in a lower end of the cap body 61 so as to be inserted into the mass body 5 through the filling opening 51. A specific gravity of the protrusion 63 is made different from the specific gravity of the liquid to be filled in the mass body 5, and several kinds of seal caps 6 having the protrusions 63 of different volumes can be exchangeably fit on the filling opening 51. Mass of the damper mass is finely adjusted by exchanging the seal cap 6.
Atsuko Oaku
Next Patent: HYDRAULIC PRESSURE SUPPLY MECHANISM FOR TRANSMISSION