March 25, 2020
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Hydraulic fuel pumps are responsible for delivering fuel at a proper pressure during engine operation in aircraft. In gear-type pumps, two meshed gears revolve in an external housing, pumping fuel through. These pumps are designed to be rigid enough to pump vicious fluid, in aircraft applications, at high pressures.
In external gear-type pumps, a bushing block provides structural support for two bearings. The two gears responsible for displacing fuel are then mounted on these bearings. Ultimately, the bushing block also serves as a wear surface for the gear faces as well.
For the aerospace industry, the bushing blocks used in hydraulic pumps must be lightweight and wear resistant to promote fuel efficiency and to assure performance remains consistent over time. Similarly, the bearings used in this system must also be light weight, wear resistant, and able to operate for extended periods of time without maintenance.
GGB DP31 is a hydrodynamic metal-polymer composite bearing solution for lubricated conditions in industrial pump applications. DP31 plain bearing features low friction and great wear resistance in lubricated applications. Additionally, it has excellent flow erosion and cavitation resistance to assure a long service life.
SICAL®3D is an aluminum bushing block that features proprietary materials that result in low friction, increased wear resistance, and increased hardness. This blend also provides SICAL®3D bushing block with both high load capacity and mechanical strength as well as allowing for operation in high temperatures.
GGB DTS10® metal-polymer hydrodynamic composite bearings offer similar performance to DP31 composite plain bearings with the additional benefit of being machinable after installation for tight tolerances.
Utilizing DP31 composite bearings and SICAL®3D bushing blocks in your fuel pump applications provides the following benefits:
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