Liquid-sealed-type anti-vibration device and method for manufacturing the same

1. A liquid-sealed-type anti-vibration device comprising:

an inner-tube member to be connected to a member on either one of a vibration-generating side and a vibration-transmitted side;

an outer-tube member located outside of the inner-tube member to be connected to a member on the other one of the vibration-generating side and the vibration-transmitted side;

a first rubber body for connecting one end of the outer-tube member with an outer circumferential surface of the inner-tube member in a liquid-tight manner;

a second rubber body for connecting the other end of the outer-tube member with the outer circumferential surface of the inner-tube member in a liquid-tight manner;

a fluid chamber configured in such a way that a space defined by the first rubber body, the second rubber body, the inner-tube member and the outer-tube member is sealingly filled with non-compressible liquid, wherein

the inner-tube member is provided with an inner-tube rigid protrusion at an intermediate section of the inner-tube member in an axial direction, the protrusion protruding from the outer circumferential surface of the inner-tube member toward the outer-tube member and extending over an entire circumference of the inner-tube member, a rubber partition is provided to connect an outer circumferential surface of the inner-tube rigid protrusion and an inner circumferential surface of the outer-tube member with each other in a liquid-tight manner to divide the fluid chamber into two liquid chambers with the inner-tube rigid protrusion, and the inner-tube rigid protrusion is provided with a limiting passage which allows the liquid chambers to communicate with each other,

the outer-tube member has a first outer-tube rigid protrusion protruding from the inner circumferential surface of the outer-tube member toward the inner-tube member through the first rubber body and having a shape of an inward flange; and a second outer-tube rigid protrusion protruding from the inner circumferential surface of the outer-tube member toward the inner-tube member through the second rubber body and having a shape of an inward flange, and at least one of the first outer-tube rigid protrusion and the second outer-tube rigid protrusion is located on the side of the liquid chamber, and

each of the first rubber body and the second rubber body is provided with a ring-shaped cavity extending inside the respective rubber body along the outer circumferential surface of the inner-tube member and having a depth, in a section that includes a central axis of the inner-tube member and that is taken along the central axis, axially extending past the first outer-tube rigid protrusion or the second outer-tube rigid protrusion, at least one of the cavities facing one of the liquid chambers;

the limiting passage is provided within the inner-tube rigid protrusion;

the first outer-tube rigid protrusion protrudes from the inner circumferential surface of the outer-tube member toward the inner-tube member; and

the second outer-tube rigid protrusion protrudes from the inner circumferential surface of the outer-tube member toward the inner-tube member.

2. A liquid-sealed-type anti-vibration device according to claim 1 ,

wherein, in the section, an inner-circumferential end portion of at least one of the first outer-tube rigid protrusion and the second outer-tube rigid protrusion is curved toward the inner-tube rigid protrusion, and a vertex surface or a bottom surface of the cavity provided in the first rubber body or the second rubber body in which the respective outer-tube rigid protrusion is embedded, has a mild convex curved shape.

3. A liquid-sealed-type anti-vibration device according to claim 1 ,

wherein a protruding height of the inner-tube rigid protrusion from a largest-outer-diameter section of the inner-tube member is in a range of 50%-80% of a radial distance from the largest-outer-diameter section to an inner circumferential surface of a body of the outer-tube member, and protruding heights of the first outer-tube rigid protrusion and the second outer-tube rigid protrusion are in a range of 50%-80% of the radial distance from the largest-outer-diameter section to an inner circumferential surface of a body of the outer-tube member.

4. A liquid-sealed-type anti-vibration device according to claim 1 ,

wherein a thickness of the rubber partition in the axial direction is the shortest at a region located circumferentially outward of midpoint between an inner circumferential surface and an outer circumferential surface of the rubber partition.

5. A liquid-sealed-type anti-vibration device according to claim 1 ,

wherein an end portion of the outer-tube member on the side of one of the rubber bodies is provided with a small-diameter end section having an outer diameter smaller than an outer diameter of an end portion of the outer-tube member on the side of the other one of the rubber bodies and an outer diameter of a portion of the outer-tube member corresponding to the mounting position of the rubber partition, and the small-diameter end section is provided with a liquid injection inlet sealed by a plugging member.

6. A method for manufacturing a liquid-sealed-type anti-vibration device according to claim 5 , the method comprising:

injecting liquid from the liquid injection inlet provided in the outer-tube member after assembling of component members of the device, and

subsequently to the injecting, sealing the liquid injection inlet by the plugging member.