| 摘要 |
An entire outer periphery of an axially central portion of an inner cylindrical member is expanded outwardly to define an expanding portion having a spherical configuration of which a center locates about an axial line of the inner cylindrical member. A cylindrical internal ring is disposed in about the middle between an outer cylindrical member and the inner cylindrical member coaxially and an axially central portion of the internal ring bends in conformity with the expanding portion of the inner cylindrical member. By virtue of the expanding portion and internal ring, the rigidity in the directions perpendicular to the axial direction increases. A first vibration-damping rubber member and a second vibration-damping rubber member are formed between the internal ring and the inner cylindrical member and between the internal ring and the outer cylindrical member, respectively, and annular recesses are formed in both axial end portions of the first and second vibration-damping rubber member, respectively, such that an inner end of each annular recess locates inwardly of an end edge of the expanding portion, thus decreasing the torsional rigidity.
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