Patent ID: 6557837
Filing Date: 2003-05-06
Classification: F16F

Abstract:
A liquid-filled cylinder-shaped hydraulic vibration isolator, comprising:a main axial fitting; an intermediate cylinder fitting disposed outside said main axial fitting coaxially and including a pair of ring members positioned on the opposite ends thereof in the axial direction thereof and a bridging member bridging between both of the ring members to form a plurality of window portions, disposed in the peripheral direction thereof, together with both of the ring members; a rubber elastic body interposed between said main axial fitting and said intermediate cylinder fitting to connect them integrally and having a plurality of dented portions, opened to the window portions of said intermediate cylinder fitting; an outer cylinder fitting disposed outside said intermediate cylinder fitting coaxially, covering the openings of the dented portions by being subjected to drawing and forming a plurality of liquid chambers, filled with a liquid and communicated with each other by way of an orifice passage, between itself and the dented portions of said rubber elastic body; a sealing rubber disposed between said intermediate cylinder fitting and said outer cylinder fitting to seal the liquid filled in the liquid chambers; the respective ring members of said intermediate cylinder fitting including a drawn major-diameter portion positioned on an outside in the axial direction thereof and being subjected to drawing and a minor-diameter portion disposed inside the drawn major-diameter portion by way of a stepped portion, formed as a smaller diameter than that of the drawn major-diameter portion and having a plurality of slits formed along the peripheral direction thereof; said sealing rubber being fastened to outer peripheral surfaces of the minor-diameter portion and the bridging member so as to enclose the window portions of said intermediate cylinder fitting; and wherein the slits are disposed at about equal intervals in the peripheral direction of the minor-diameter portion of the respective ring members of said intermediate cylinder fitting.