Active vibration isolation device

An active vibration isolation device comprising:

• an outer hollow cylinder;
• an inner hollow cylinder situated at an inner circumferential side of the outer hollow cylinder;
• a magnetic field generation portion configured to generate a magnetic field;
• a magnetic body where a magnetic path is formed by the magnetic field;
• a first liquid chamber and a second liquid chamber that are filled with magnetic viscoelastic fluid,
• a third liquid chamber adjacent to the first liquid chamber in an axial direction of the inner hollow cylinder and filled with non-magnetic liquid;
• and
• a fourth liquid chamber adjacent to the second liquid chamber in the axial direction of the inner hollow cylinder and filled with non-magnetic liquid, wherein
• the first liquid chamber and the third liquid chamber are partitioned by a first flexible member,
• the second liquid chamber and the fourth liquid chamber are partitioned by a second flexible member,
• a first one of the third liquid chamber and the fourth liquid chamber is provided between the outer hollow cylinder and the inner hollow cylinder so as to be able to be pushed in a transverse direction perpendicular to the axial direction,
• a second one of the third liquid chamber and the fourth liquid chamber is provided radially outward of the outer hollow cylinder so as to be able to be pushed in the axial direction, and
• part of the first liquid chamber and part of the second liquid chamber form a flow channel for the magnetic viscoelastic fluid located above the magnetic path.