# US 2018/0023707 A1 · Sealing device

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- Number: US 2018/0023707 A1
- Document ID: US20180023707A1
- Status: Published application
- Kind: A1
- Application number: 15/540,470
- Filed: 2016-01-06
- Published: 2018-01-25
- Earliest claimed: 2015-01-08
- Assignees: Nok Corporation
- Applicants: Nok Corporation
- Inventors: Yoshihisa YAMAGUCHI; Hideharu HYAKUTAKE; Yuya SAKANO
- Web page: https://patentgrep.com/patent/US20180023707A1

## CPC

- F16J 15/164: {the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid}
- F16J 15/3204: with at least one lip
- F16J 15/3244: with hydrodynamic pumping action
- F16J 15/3264: the elements being separable from each other
- F16J 15/3456: {without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

The invention provides a sealing device which can suppress occurrence of static leakage and has a seal lip and a seal flange which are slidably in contact with each other, and a screw groove arranged in an end face, in an axial direction, of the seal flange. In the sealing device, the seal lip attached to a non-rotational housing side is slidably in contact with the end face, in the axial direction, of the seal flange on the rotational axis side, and which has the screw groove arranged in the end face, in the axial direction, of the seal flange so as to exert a fluid pumping action during rotation, is characterized in that the screw groove has an inner-circumferential-side inclined surface and an outer-circumferential-side inclined surface as the internal surfaces, and has a groove bottom part in a circular arc cross-sectional shape that interconnects both of the inclined surfaces.

## Claims

### Claim 1

A sealing device comprising:
a seal lip fitted on a non-rotating housing side;
a seal flange on a rotating shaft side;
the seal lip being configured to be slidably brought into contact with an axial-direction end surface of the seal flange; and
a screw groove providing a fluid pumping action at a time of rotation, and disposed in the axial-direction end surface of the seal flange,
wherein the screw groove includes an inner surface including an inner-peripheral side slope and an outer-peripheral side slope, and the inner surface further includes a groove bottom portion having an arcuate cross section connecting both the slopes to each other.

### Claim 2 (depends on 1)

The sealing device according to claim 1,
wherein a radius of curvature of an arc shape of the groove bottom portion having the arcuate cross section is set to be greater than a groove depth of the screw groove.