| 摘要 |
To provide such a resin lip type seal (1) installed in an annular clearance between a housing (12) and a reciprocating shaft (13) that shapes of tip parts (31, 41, 61) of lips (3, 4, 6) fitted to a mating member (12 or 13) are not changed with elapse of time and the tip parts (31, 41, 61) exercise, in a well-balanced state, both a function for securing low leak, which is the feature of sharp shape, and a function for securing oil film thickness, which is the feature of round-shape, flat surfaces (21) with axial widths (W) having edge parts (22) are formed at the tip parts (31, 41, 61), and the axial widths (W) are determined to be 5 to 30% of the overall axial widths (A) of the lips (3, 4, 6).
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