| 摘要 |
PURPOSE:To effectively improve vibration insulating performance to high frequency vibration by providing an air room, which is affected by inner pressure in a pressure room, at least in part on the opposite side across a flexible-film partition member to a portion where a narrow portion is not formed. CONSTITUTION:Although change in a distance between the first and second supportings 10, 12 in vibration input involves compression inside of an air room 44 and a fluid room 40 to excite inner pressure change, the inner pressure change is very favourably absorbed and moderated in accordance with the compression quality of air 48 existing in the air room 44 to favorably prevent a mount dynamic spring constant from greatly increasing with the increase of inner pressure in the fluid room 40. Besides, since the air room 44 which can provides dynamic spring reducing effect due to inner pressure absorption is formed on the opposite side across a partition member 39 to a portion of the fluid room 40, where a narrow portion 46 is not formed, there is almost no possibility to disturb the flow property of fluid in the narrow portion 46 which is excited in the air room 44 in vibration input as well as damping effect which is developed in fluid shearing operation. |
