Cylinder bore having variable coating
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United States of America Patent
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Nov 19, 2019
Grant Date -
Sep 14, 2017
app pub date -
Mar 9, 2016
filing date -
Mar 9, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Engine blocks and methods of forming the same are disclosed. The engine block may comprise a body including at least one cylindrical engine bore wall having a longitudinal axis and including a coating extending along the longitudinal axis and having a coating thickness. The coating may have a middle region and first and second end regions, and a plurality of pores may be dispersed within the coating thickness. The middle region may have a different average porosity than one or both of the end regions. The method may include spraying a first porosity coating in a middle longitudinal region of the bore and spraying a second porosity coating in one or more end regions of the bore. The first porosity may be greater than the second porosity and the first and second porosities may be formed during the spraying steps. The pores may act wells for lubricant.
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