Fluid-sealed type vibration isolating apparatus

A fluid-sealed type vibration isolating apparatus comprising:

• a first coupling member to be fixed to a vibrating body;
• a second coupling member to be attached to a chassis frame member and the like;
• an insulator disposed between said first and second coupling members and cutting off vibrations from said vibrating body;
• a fluid chamber comprising a main chamber and a sub-chamber in which an incompressible fluid is sealed;
• an orifice intercommunicating said main chamber and said sub-chamber;
• a partition plate partitioning said main chamber and sub-chamber;
• a diaphragm forming part of the walls of said sub-chamber and separating said sub-chamber from the open air;
• and
• an electromagnetic oscillator which causes vibrations so as to make the fluid in said main chamber resonate hydraulically at a specified frequency,
• wherein a vibration isolating mechanism section which is to be mounted to the vibrating body and which comprises the insulator, the fluid chamber, a second diaphragm which is vibrated so as to make the fluid in said fluid chamber resonate hydraulically at a specified frequency and a balancing chamber, and a vibrating mechanism section having a vibration diaphragm which is operated in such a manner as to propagate an air pressure composed of pulsating waves having a specific frequency to said balancing chamber and the electromagnetic oscillator for driving said vibration diaphragm, are separately provided, and said balancing chamber of the vibration isolating mechanism section and an air pressure generating chamber of the vibrating mechanism section in which said vibration diaphragm is provided, are connected with each other by means of a communication passage.