Circumferential Groove in Cylinder of Piston Machines

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In current swash-plate type axial-piston machines, the pistons move axially in a dynamically changing tilted position, traveling periodically between the inner and outer dead center of the piston while the unit's machine shaft rotates. The fluid film between the piston and its surrounding cylinder bore or bushing is on the order of microns thick, and currently, inefficiencies exist in these machines due to metal-to-metal contact in pistons that result from insufficient fluid film.

Researchers at Purdue University have developed a novel approach to prevent metal-to-metal contact in pistons in the event of insufficient hydrodynamic load carrying ability of the fluid film between the piston and cylinder through the utilization of hydrostatically balanced areas. Subsequently, this technology equips the design of swash-plate type machines for high pressure, utilizing low-viscosity fluids, like water. The technology helps increase the load-carrying capacity of the fluid film between the piston and cylinder due to additional hydrostatic bearing capacity, which helps prevent metal-to-metal contact.

-Prevents metal-to-metal contact between the piston and cylinder
-Allows swash plate type machines to utilize low viscosity fluids like water

Potential Applications:
-Piston-cylinder bores
-Axial piston pumps
Jul 12, 2016
Utility Patent
United States
Apr 2, 2019

Jul 13, 2015
United States
Purdue Office of Technology Commercialization
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