Dual ring configuration for a stationary seal
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United States of America Patent
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Feb 21, 2017
Grant Date -
Nov 6, 2014
app pub date -
May 2, 2014
filing date -
May 3, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
In a piston-ported engine, a sealing ring may be placed in a groove in the cylinder. As the groove is of greater diameter than the cylinder, the sealing ring overlaps into a helix allowing it to be enter the cylinder. However, such a helix does not fit into a groove without when in the helix. Alternatively, a shorter sealing ring is placed into the groove. However, the gap is too large. According to one embodiment, a groove of double the width of the ring is provided and the helical ring is installed and caused to unwind in the groove so that the ring sits in a plane. A spacer ring is placed in the groove to fill the extra space in the groove. An elastomeric material or a tension spring in an outer groove in the sealing ring can be used to cause the ring to press against the piston.
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