US 2007/0182104 A1Published application

Sealing device

AssigneeNok Corporation

InventorHiroki Matsui

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Abstract

On a seal lip (7), first screw projections (12) are arranged from an atmosphere side slope surface (11) to the middle of a sliding surface (10), and second screw projections (13) are arranged on the sliding surface (10) The end section on the sliding surface (10) side of a first screw projection (12) has a shape (cutout section (12a)) as if the section is cut out along the sliding surface (10), and a portion on the atmosphere side slope surface (11) side of the first screw projection (12) has an equi-width section (12c) with a shape where the height of the section increases toward the atmosphere side (A) with the width kept substantially the same. Therefore, a sealing device is easily processed, and, at an early stage and for permanence, the sealing device provides a screw pump effect that exhibits excellent sealing ability for a long period.

Claims2

Dependent claims

A sealing device that tightly seals an annular space between two members combined with each other in such a way as to rotate relatively to each other and has a seal lip sliding on a peripheral surface of one member of the two members, characterized in that the seal lip comprises:

a sliding surface along the peripheral surface;
a slope surface that slopes in such a way as to gradually enlarge a space with respect to the peripheral surface from an atmosphere side end edge of the sliding surface;
first screw projections formed from the slope surface to a middle of the sliding surface;
and
second screw projections formed on the sliding surface, wherein
an end on a sliding surface side of the first screw projection is formed in a shape cut out along the sliding surface, and a portion on a slope surface side of the first screw projection has an equal width portion formed in a shape in which height increases toward an atmosphere side with a width kept a nearly equal width.

3 more elements

Dependencies are inferred from the claim text.