Hydraulic bushing with springs in parallel
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United States of America Patent
Stats
-
Jun 15, 2004
Grant Date -
Jul 24, 2003
app pub date -
Dec 19, 2002
filing date -
Dec 19, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic bushing forms a mount between a first component and a second component by including a spring portion connected between a core and an inner structure. The spring portion includes a first spring portion for defining hydraulic fluid cavities and a fluid channel extending between the cavities, with the cavities located about a first portion of the core, and a second spring portion formed of microcellular polyurethane about a second portion of the perimeter. The first spring portion and the second spring portion are located in parallel to one another. In this way, vibrations of a load transferred through the hydraulic bushing between the core and the inner support structure can be damped at a predetermined low frequency by the rubber with hydraulic fluid cavities, while still allowing for isolating of higher frequencies by the microcellular polyurethane portion of the spring.
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