| 摘要 |
PURPOSE:To obtain wide silencing effect through additional action of resonant type silencing effect of a discharging chamber by providing a bearing having a hole communicating both faces of cylinder side and counter cylinder side with each other and a cylinder having a hole communicating to the hole of the bearing. CONSTITUTION:Coolant compressed in a cylinder 13 is discharged into a discharging chamber 10a from a valve hole 19, and discharged furthermore from the discharging hole 10b of a discharging cover 10 into the space in a sealed case. The pressure pulsation of the coolant generated in the cylinder 13 is damped by silencing effect of the discharging chamber 10a. This time, the discharging chamber 10a is communicated to a bearing 12 and a chamber 18 provided in the cylinder 13, and the chamber 18 acts as a side branch type silencer against the pressure pulsation in the discharging chamber 10a. Therefore, wide silencing effect can be obtained by setting the frequency silenced of the chamber 18 to the center of frequency region not damped by the discharging chamber 10a.
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