LIQUID-SEALED VIBRATION ISOLATOR

摘要

A partition (40) for partitioning a first liquid chamber (36A) and a second liquid chamber (36B) is constituted of an annular orifice forming member (44), an elastic wall (46) for blocking a slit between its inner peripheral surface (44A) and a pair of partitioning plates (48,50) for sandwiching the elastic wall in its axial direction (X). The elastic wall (46) includes a border line (64) extending in a circumferential direction (C), a thin wall (66) having a wall surface (66A) arranged apart from and facing plate surfaces (48B,50B) of the partitioning plates on the inner peripheral side of the border line, and a thick wall (68) forming thickness thickened stepwisely from the thin wall (66) across the border line on an outer peripheral side of the border line and having a wall surface (68A) forming a gap (74) gradually becoming wider toward a radially outward (Ko) side between plate surfaces (48C, 50C) of the partitioning plates. Thus, both improvement of attenuation performance for low frequency large amplitude vibration and reduction in dynamic spring constant for high frequency small amplitude vibration can be attained at a high level.