| 摘要 |
PURPOSE: To prevent a sealing liquid from short-circuiting between both liquid chambers without passing through an orifice passage. CONSTITUTION: A partition wall 5 to partition a space between a first liquid chamber A and a second liquid chamber B is composed of a first partition plate 51 and a second partition plate 52 whose whole circumferences on the outer peripheral side are brought into close contact with and butted on each other, and a orifice passage C expanding in the radial direction is formed toward a second opening part 52d arranged at a prescribed interval in the circumferential direction so as to face a second liquid chamber B in a position on its outer peripheral side from a central first opening part 51b facing a first liquid chamber A between both partition plates 51 and 52, and this orifice passage C presents a labyrinth-shaped cross-sectional shape of being repeatedly folded back in the axial direction. |
