Patent ID: 6425575
Filing Date: 2002-07-30
Classification: F16F

Abstract:
A switchably controlled liquid sealed type vibration isolator comprising:a vibration isolating base member formed of an elastic rubber member, a first metal fixing member combined with one of upper and lower portions of the vibration isolating base member, a main cylindrical metal member combined with the other portion of the vibration isolating base member, a first diaphragm fixed to the main cylindrical metal member so as to be opposed to the vibration isolating base member, a partition provided between the vibration isolating base member and the first diaphragm, a main liquid chamber formed between the partition and the vibration isolating base member, a first auxiliary liquid chamber formed between the partition and the first diaphragm, a second auxiliary liquid chamber formed in a side portion of the partition, first and second orifices communicating the main liquid chamber with the first and second auxiliary chambers respectively, the partition having a main partition member having an outer circumferential portion defining the first orifice, a second diaphragm being provided on a main liquid chamber-side portion of the main partition member so as to form a change-over chamber in a diametrically inner portion thereof, the change-over chamber being separated from the second auxiliary chamber via the second diaphragm and configured to accept an atmospheric pressure and a negative pressure in a switchable manner, a partition plate member which presses a circumferential portion of the second diaphragm toward the main partition member to form the second auxiliary liquid chamber between the partition plate member and the second diaphragm, the partition plate member being engaged around an outer circumferential portion of the main partition member by swaging, a portion defined by the main partition member and partition plate member on an outer side of the second auxiliary liquid chamber being formed as the second orifice, a partition receiving plate having an outer circumferential edge portion which extends outward beyond an outer end of the main partition member being press fit fixed to the main partition member on a side facing the first auxiliary liquid chamber, the partition plate member being fitted liquid-tightly in an inner circumferential portion of the main metal member, the outer circumferential edge portion of the partition receiving plate being fixed along with the first diaphragm to the main metal member by swaging.