Patent ID: 9217488
Filing Date: 2015-12-22
Classification: B60G,F16F

Abstract:
1. A hydro bush comprising: an outer pipe comprising an inner surface; an inner piece arranged inside the outer pipe; a rubber piece comprising a first rim portion, a second rim portion and a middle portion arranged along a central axis such that the middle portion is interposed between the first and second rim portions; the rubber piece fitted between the outer pipe and the inner piece such that each of the first and second rim portions contacts the outer pipe and that a liquid chamber is formed between the middle portion of the rubber piece and the inner surface of the outer pipe and further between the first and second rim portions; and the first rim portion comprising two opposing bands formed on its outer circumference such that the two opposing bands contact the inner surface of the outer pipe and define a first flow path between the inner surface of the outer pipe and the first rim portion and further between the two opposing bands of the first rim portion; the first rim portion further comprising a plurality of protrusions protruding from each of the two opposing bands toward the other of the two opposing bands such that the first flow path undulates as it extends in a circumferential direction perpendicular to the central axis; the second rim portion comprising two opposing bands formed on its outer circumference such that the two opposing bands contact the inner surface of the outer pipe and define a second flow path between the inner surface of the outer pipe and the second rim portion and further between the two opposing bands of the second rim portion; and the second rim portion further comprising a plurality of protrusions protruding from each of the two opposing bands toward the other of the two opposing bands such that the second flow path undulates as it extends in the circumferential direction.