Piston-type positive displacement machine with a pressure-adaptive piston-cylinder interface
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United States of America Patent
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Sep 14, 2021
Grant Date -
Oct 29, 2020
app pub date -
Apr 23, 2020
filing date -
Apr 24, 2019
priority date (Note) -
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Abstract
A piston and cylinder assembly of an axial piston machine is disclosed which includes a cylinder having a uniform internal diameter, a cylindrical bushing press-fit against the inner surface of the cylinder and extending at least partially therein, the bushing comprising at least one circumferential groove formed on an outer surface of the bushing against the inner surface of the cylinder, a piston reciprocably disposed within the cylindrical bushing, generating a piston-bushing-interface, the piston and the bushing defining a diametrical clearance therebetween, the diametrical clearance defining a lubrication gap and a fluid-dynamic seal between the piston and the cylindrical bushing.
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