| 摘要 |
PURPOSE:To aim at preventing vibration and noise from occurring, by providing such an arrangement that a surrounding plate for shielding an oil pump coupled to a rotary shaft from discharged fluid is arranged around a discharge valve and a discharge port which are positioned in lubrication oil in the bottom section of a closed casing. CONSTITUTION:A surrounding plate 19 for shielding an oil pump 20 coupled to a rotary shaft 4 from discharged fluid, is arranged around a discharge valve 17 and a discharge port 10 which are positioned in lubrication oil 21 in the bottom section of a closed casing 1. Compressed high pressure fluid is discharged into an internal space 19' defined by the surrounding plate 19 from the discharge port 10 after pressing and then opening the discharge valve 17 and the retainer plate 18. Since the lubrication oil is filled in the internal space 19', the high pressure fluid is discharged into the lubrication oil 21 so that pressure pulsation, in the high-pressure oil, which is transmitted to the closed casing 1 through a cylinder frame 7 to generate vibration incurring noise, is absorbed into the lubrication oil 21, thereby noise and vibration may be prevented from occurring. |
