Andrew A Kropp

US Patent:

6749186, Jun 15, 2004

Filed:

Dec 19, 2002

Appl. No.:

10/324157

Inventors:

Rod G. Hadi - South Lyon MI
Bjoern Oppermann - Ann Arbor MI
Andrew James Kropp - Coloma MI

Assignee:

Freudenberg-NOK General Partnership - Plymouth MI

International Classification:

F16F 500

US Classification:

26714012

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.