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US 10,082,027 B2Granted
Piston unit and hydrostatic radial-piston machine
AssigneeRobert Bosch GmbH
InventorsAdam MacPhee, Geoffrey Kermode, Kevin Kilroy
Life of this patent
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Abstract
A piston unit includes a piston which has a rolling element seat configured to rotatably support a rolling element. The rolling element seat has a bearing surface with a surface coating composed of a polymer compound or with a ceramic surface coating.
Claims12
A piston unit of a hydrostatic machine, comprising:
- a piston including a rolling element seat configured to rotatably support a rolling element, the rolling element seat including a bearing surface,
- wherein the bearing surface has a surface coating composed of a polymer compound,
- wherein the polymer compound is applied in at least two layers, and
- wherein the polymer compound in a first layer differs from the polymer compound in a second layer.
1 more element
A piston unit, of a hydrostatic machine, comprising:
- a piston including a rolling element seat configured to rotatably support a rolling element, the rolling element seat including a bearing surface,
- wherein the bearing surface has one of a surface coating composed of a polymer compound and a ceramic coating, and
- wherein the bearing surface is integrally formed with the piston.
A hydrostatic radial-piston machine, comprising:
- at least one piston unit including a piston, the piston having a rolling element seat configured to rotatably support a rolling element,
- wherein the rolling element seat includes a bearing surface having a surface coating composed of a polymer compound,
- wherein the polymer compound is applied in at least two layers,
- wherein the polymer compound in a first layer differs from the polymer compound in a second layer, and
- wherein the at least one piston unit is guided in a cylinder bore of a cylinder block.
2 more elements
Dependencies are inferred from the claim text.