| 摘要 |
PROBLEM TO BE SOLVED: To stabilize the vibration isolating performance while preventing a remarkable rise of a dynamic spring constant even in the case of a different initial load by providing an inner diameter dimension changing part at axial intermediate part of an outer cylinder member, and setting a large inner diameter dimension at a tip of the outer cylinder member in a direction of the movement of a shaft member due to the initial load. SOLUTION: An initial load P due to a dead weight of a body is applied in the axial direction between an inner and an outer cylindrical metals 12, 14. The inner cylindrical metal 12 is relatively displaced downward in the axial direction in relation to the outer cylindrical metal 14. A main body rubber elasticity 15 is relatively displaced downward in the axial direction in relation to the outer cylindrical metal 14 from a small diameter cylindrical part 30 of the outer cylindrical metal 14 to an intermediate tapered cylindrical part 28 formed with a distance between opposite surfaces of the inner and the outer cylindrical metals 12, 14 in the radial direction larger than that of the small diameter cylindrical part 30, and furthermore, toward a large diameter cylindrical part 32. As a result, a remarkable change such as a rise of a static spring coefficient and a dynamic spring coefficient of the main body rubber elasticity 15 with the input of an axial load is reduced or avoided, and the vibration isolating performance is stabilized even in the condition that the initial load is input and a different initial load is input. |
