Piston ring
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United States of America Patent
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Issued Date -
Mar 10, 2005
app pub date -
Sep 10, 2004
filing date -
Sep 10, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A twin piston ring includes of two concentric rings (1, 2) whereby the first ring (1) is designed as an L-shaped ring and the second ring (2) is designed as an inserted cross sectioned ring with a gap (6) that is offset relative to the one of the first ring (1). The inserted ring (2) is arranged on the pressure side (12) of the piston ring to ensure uniform wear of both rings (1, 2) at unchanging good sealing effect and to ensure simple manufacturing whereby, in addition, the inserted second ring (2) is provided with a projection (18) overlapping the gap (5) of the L-shaped ring (1) at the pressure side (12, 15) as well as the inner side (16) near the axis, and whereby the projection (18) forms at the same time a locking device against twisting of the rings (1, 2) against one another.
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