SEALING DEVICE, AND PUMP DEVICE USING SAME
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United States of America Patent
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N/A
Issued Date -
Dec 6, 2012
app pub date -
Jan 13, 2011
filing date -
Jan 26, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A sealing device is constructed by a seal ring and a back ring, the back ring is constructed by a lip packing provided with an inner lip and an outer lip in one end portion in an axial direction of an annular base portion, and is provided with an annular protrusion for setting a diametrical direction compression margin in the back ring in an outer peripheral surface of the annular base portion. The outer lip has a function of sealing the sealed fluid by coming into close contact with the cylinder and releasing the accumulated pressure by being pushed by a pressure at a time of a pressure accumulating phenomenon in the another space in the axial direction so as to be spaced from the cylinder. The annular protrusion is provided with a flow path for introducing the accumulated pressure to the outer lip.
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