Three-piece oil ring for internal combustion engines, expanding element, and annular element
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United States of America Patent
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Aug 15, 2017
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app pub date -
Sep 24, 2013
filing date -
Sep 27, 2012
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Abstract
A three-piece oil ring for an internal combustion engine may include an expanding element defining at least a first side and a second side opposite the first side. A first upper annular segment may be associated with the first side of the expanding element. A second lower annular segment may be associated with the second side of the expanding element. The first annular segment and the second annular segment may each include a first internal side surface and a second external side surface. A metallic tungsten matrix coating may be disposed on at least one of the expanding element, the first annular segment and the second annular segment via chemical vapor deposition. The coating may contain a tungsten nanocarbide that may include at least one of WC, W2C, W3C and W12C. The coating may include a thickness between 5 μm and 150 μm and a hardness between 1000HV and 3500HV.
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