Patent ID: 6631894
Filing Date: 2003-10-14
Classification: F16F

Abstract:
A controlled-type liquid-filled vibration isolator comprising:an anti-vibration basic member formed by a rubber elastic member; a first metal fitting coupled to one of an upper side and a lower side of said anti-vibration basic member; a second metal fitting having a cylindrical barrel coupled to the other side of said anti-vibration basic member; a first diaphragm attached in said cylindrical barrel oppositely to said anti-vibration basic member; a partition arranged between said anti-vibration basic member and said first diaphragm; a main liquid chamber formed between said partition and said anti-vibration basic member; a first sub liquid chamber formed between said partition and said first diaphragm; a switch chamber capable of admitting, by switching, atmospheric pressure and negative pressure formed inward at a main liquid chamber side of said partition by a second diaphragm; a second sub liquid chamber isolated from said switch chamber by said second diaphragm; first and second orifices respectively communicating said main liquid chamber with said first and second sub liquid chambers; said partition having a partition main member having a recess forming a first orifice at a side of said first sub liquid chamber in an outer periphery and a partition plate member arranged at a side of said main liquid chamber of said partition main member forming said second sub chamber and second orifice, these being fitted on said cylindrical barrel through a seal rubber layer, and further a passage communicating from said switch chamber to the outer periphery being provided in said partition main member and said passage being fitted with an admission pipe for switching between atmospheric pressure and negative pressure penetrating said cylindrical barrel; and said partition main member having a seal surface in contact with said seal rubber layer in an inner periphery of said cylindrical barrel, being located at an outer periphery of said partition main member at around an opening end of said passage in a manner surrounding said passage, and sealing said passage, and a pressure-receiving surface broader than the other portion of the outer periphery of said partition main member, being provided on an opposite side to said seal surface sandwiching a device axis to enable dispersion of an external force upon press-fitting said admission pipe, and said pressure receiving surface extending from top to bottom of the partition main member and being absent an orifice.