| 摘要 |
PURPOSE:To secure a flat transfer force characteristic by installing a tubular rubber elastic body interposingly between an inner cylinder and an outer cylinder concentric with the former, sealing a high viscous fluid in an annular liquid chamber installed in an axial intermediate part of this rubber elastic body, and forming a shearing clearance part there. CONSTITUTION:An annular fluid chamber 26 is constituted as circular, fine clearance parts 28, 28 in a gap with an outer cylinder fitting 4 by a trapezoidal projection 18 being projected from the side of respective fittings 2 at a part to be situated at both sides of these inner cylinder fittings 2 in the vibration input direction P. At time of vibration input, pressing force works on a high viscous fluid existing therein works at these fine clearance parts 28, 28, whereby such an action as eliminating the high viscous fluid in the circumferential direction to be shown in an arrow is added from this space. Therefore a flow is produced in the high viscous fluid and thereby shearing force proportionate to a velocity gradient of the flow is generated there, through which effective damping force is also produced and an effective vibro-damping action is securable as the whole bush owing to viscosity resistance force and synergistic effect in shearing clearance parts 22, 22. |
