| 摘要 |
In order to attenuate low and intermediate frequency vibration ranges a mounting device is provided with two electronically controlled variable orifices. During low frequency vibrational ranges one is left either de-energized or partially energized to permit either free or limited communication between a main working chamber and a first auxiliary or expansion chamber, while the other is fully energized to close communication between the main chamber and a second auxiliary chamber. When the higher vibrational range is entered the first orifice is conditioned to cut off communication with the first auxiliary chamber and while the second is de-energized. The passage structure in the second orifice unit is designed to induce the fluid therein to undergo resonance when the higher vibration frequency is applied thereto.
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