February 20, 2018
Plain Bearings for Aerospace Applications Article
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AT A GLANCE
External gear pumps and motors mounted with hydraulic bushing blocks are widely used in many industries such as construction, agriculture, automotive and material handling equipment and chemicals.
Built with few components, these reliable, lightweight, robust pumps provide outstanding performance in volumetric efficiency. When assembled with low-friction bearings, they can provide fixed-flow efficiencies of greater than 95% to hydraulic systems.
The aluminum bushing block serves several purposes, which include supporting the gear shafts, acting as a thrust bearing and providing a sealing function to ensure good contact with the faces of the gears. SICAL®3D alloy is highly effective under a wide range of load, speed, temperature and fluid viscosity conditions.
Sealing efficiency can be compromised under shaft loading due to internal leakage resulting from deformation and changes in geometry of the side face of the bushing block. The superior mechanical strength of SICAL®3D resists this deformation which significantly improves the volumetric efficiency of external gear pumps and motors.
Compared to standard aluminum alloys SICAL®3D offers:
Internal Gear Pumps and Motors
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