| 摘要 |
PURPOSE:To reduce swish sound without any influence upon a damping force characteristic by making the diameter of an oil hole for conducting operating oil in a volute casing to another oil chamber larger than that of a nozzle hole for conducting operating oil in the volute casing. CONSTITUTION:Volute casings 17, 28 disposed on a piston 5 and a bottom 8, respectively are provided with nozzle holes 41, 43 for conducting operating oil into the volute casings 17, 28 and with oil holes 40, 42 for discharging the operating oil in the volute casings. As corresponding to a change in the diameter of the oil holes 40, 42, the noise level changes largely, and the noise level becomes lower with an increase in the diameter, the diameters of the oil holes 40, 42 are set larger than those of the nozzle holes 41, 43. |
