Metcar Offers Bushings for Aircraft Fuel Pumps
A second major advantage of carbon-graphite bushings is that they are self-lubricating -- they can run dry for short periods of time without catastrophic pump failure or significant wear. In addition, Metcar carbon-graphite bushings are dimensionally stable, which permits the close bushing to shaft running clearances that are required in gear pump applications. Finally, these carbon-graphite bushings have a relatively low elastic modulus. While elastic enough that they can be press-fit into the metallic gear pump housing with no difficulty, after being properly press-fit, the Metcar bushings are pre-stressed in compression. Therefore, they exhibit nearly the same coefficient of thermal expansion as the metallic gear pump housing material. This assures that the running clearance between the shafts and the bushings will remain the same throughout the entire operating temperature range of the pump.
Metallized Carbon Corporation | |
URL: | www.metcar.com |