Process and apparatus for coating motor pistons
OwnerPeter Altinventor
Life of this patent
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Abstract
The coating of the cylindrical periphery of engine pistons with coating compound, in particular low friction materials, is performed by means of screen printing. The pistons can be coated in the vertical position around their vertical central longitudinal axis as they rotate past a screen printing stencil.
Claims17
A process for coating the cylindrical peripheral surface of engine pistons with a coating compound, comprising the steps of:
- disposing a printing stencil to the cylindrical peripheral surface of a piston, and applying the coating compound through said printing stencil to print the coating compound on said peripheral cylindrical surfaces, such that one or more coated surfaces are printed on a portion of said peripheral cylindrical surface and one or more uncoated areas in the form of slits, holes, recesses or strips are encompassed within at least one of said coated surfaces.
A process for coating the cylindrical peripheral surface of engine pistons or the like with a coating compound, comprising the steps of:
- moving the pistons individually to a screen printing unit which includes printing stencils, moving said pistons past said screen printing stencil while said pistons rotate around their central longitudinal axis, with said screen printing stencils aligned during the printing operation in a straight line without slipping while tangentially abutting the cylindrical peripheral surface of the piston, using a blade in said screen printing unit to press the screen printing stencil against the cylindrical peripheral surface of the piston, and applying the coating compound through said printing stencil to print the coating compound on the pistons, wherein said coating compound has approximately 10 .mu.m thickness printed on a first portion of the piston surface to reduce engine knock and printed on a second portion of the piston surface having a thickness of approximately 20 .mu.m for emergency lubrication.
A process for coating the cylindrical peripheral surface of engine pistons or the like with a coating compound, comprising the steps of:
- moving the pistons individually to a screen printing unit which includes printing stencils, moving said pistons past said screen printing stencil while said pistons rotate around their central longitudinal axis, with said screen printing stencils aligned during the printing operation in a straight line without slipping while tangentially abutting the cylindrical peripheral surface of the piston, using a blade in said screen printing unit to press the screen printing stencil against the cylindrical peripheral surface of the piston, and applying the coating compound through said printing stencil to print the coating compound on the pistons, said coating being printed in a wedge shape with the coating thickness decreasing at its lateral and/or uppper and lower edges.
A process for coating the cylindrical peripheral surface of engine pistons or the like with a coating compound, comprising the steps of:
- moving the pistons individually to a screen printing unit which includes printing stencils, moving said pistons past said screen printing stencil while said pistons rotate around their central longitudinal axis, with said screen printing stencils aligned during the printing operation in a straight line without slipping while tangentially abutting the cylindrical peripheral surface of the piston, using a blade in said screen printing unit to press the screen printing stencil against the cylindrical peripheral surface of the piston, and the coating compound through said printing stencil to print the coating compound on the pistons, wherein two or more coatings of different thicknesses are applied to said piston, one after the other at different positions on the cylindrical periphery of the piston in the same process sequence.
Dependencies are inferred from the claim text.