RECIPROCATING SEALING DEVICE

摘要

In a reciprocating sealing device sealing two members by mounting a packing to a mounting groove in one of two relatively reciprocating members, and bringing the packing into contact with the other member, the packing is provided with an annular base part, a stationary side lip, and a sliding side lip. A back ring having a lower hardness than the packing is interposed between the annular base part and a groove side surface of the mounting groove. The back ring forms a space region in relation to the other member. The annular base part is provided with a shape that the annular base part does not protrude out of an extension of a peripheral surface of the sliding side lip in a free state by forming a cross sectional shape of a heel part into a circular arc shape or a taper shape.

主权项

1. A reciprocating sealing device comprising:
two members which relatively perform a reciprocating motion; mounting groove which is provided in one member of the two members; a packing which is mounted to the mounting groove; and said packing sealing between said two members by slidably coming into close contact with the other member, wherein said packing is integrally provided with an annular base part, a stationary side lip which comes into close contact with a groove bottom surface of said mounting groove, and a sliding side lip which slidably comes into close contact with said other member, and wherein a back ring made of a material having a lower hardness than said packing is interposed between an end surface of the annular base part in said packing and a low pressure side groove side surface of said mounting groove, said back ring forms a space region in relation to said other member, the annular base part in said packing is provided with a shape that said annular base part does not protrude to said other member side from an extension of a peripheral surface of said sliding side lip in a free state by forming a cross sectional shape of a heel part from a peripheral surface facing to said other member to an end surface into a circular arc shape.