Patent ID: 9371911
Filing Date: 2016-06-21
CPC Classification: F16F,F16J

Claim Text:
1. A reciprocating sealing device comprising: first and second members which relatively perform a reciprocating motion; a mounting groove which is provided in said first member; a packing which is mounted to the mounting groove; and said packing sealing between said first and second members by slidably coming into close contact with said second member, wherein said packing is integrally provided with an annular base part, a stationary side lip diagonally projecting from said base part and which comes into close contact with a groove bottom surface of said mounting groove, and a sliding side lip diagonally projecting from said annular base part and which slidably comes into close contact with said second member such that said packing is V-shaped in cross-section, wherein a first lip end annularly projects from said stationary side lip, and a second lip end annularly projects from said sliding side lip, said first and second lip ends being configured to locally enhance seal surface pressure, and wherein a back ring made of a material having a lower hardness than said packing directly abuttingly engages an end surface of the annular base part of said packing and directly abuttingly engages a low pressure side groove side surface of said mounting groove, said back ring forms an open space region extending from said back ring to said second member, said annular base part does not protrude to said second member side from an extension of a conical surface of said sliding side lip in a free state, said conical surface extending from said second lip end toward said end surface, said annular base part including: an outer diameter of said back ring is smaller than an inner diameter of said second member and an outer diameter of said first member.