| 摘要 |
To solve unstableness of sealing capability and friction characteristic caused by intrusion of external pressure into a portion between an oil seal ( 1 ) and a dust seal ( 2 ), a sealing device for a reciprocating shaft is provided with an oil seal ( 1 ) where a main lip ( 12 ) tightly contacted with an outer peripheral surface of the reciprocating shaft ( 113 ) in the state of facing inside in the axial direction is integrally provided in an inner peripheral portion of an inner installation ring ( 11 ), and a dust seal ( 2 ) where a dust lip ( 22 ) tightly contacted with an outer peripheral surface of the shaft ( 113 ) in the state of facing outside in the axial direction is integrally provided in an inner peripheral portion of an outer installation ring ( 21 ), and the oil seal ( 1 ) is provided with an external pressure seal ( 16 ) tightly contacted with the outer installation ring ( 21 ).
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