# US 2017/0284547 A1 · Sealing Structure With Torsional Damper And Oil Seal

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- Number: US 2017/0284547 A1
- Document ID: US20170284547A1
- Status: Published application
- Kind: A1
- Application number: 15/630,039
- Filed: 2017-06-22
- Published: 2017-10-05
- Earliest claimed: 2015-01-07
- Assignees: Nok Corporation
- Applicants: Nok Corporation
- Inventors: Akihiro Komyo; Hiroki Matsui; Tomoki Nishide
- Web page: https://patentgrep.com/patent/US20170284547A1

## CPC

- F16J 15/3232: having two or more lips
- F16F 15/126: consisting of at least one annular element surrounding the axis of rotation
- F16H 55/36: Pulleys (with features essential for adjustment F16H55/52)
- F16J 15/3204: with at least one lip
- F16J 15/3252: with rigid casings or supports
- F16J 15/447: Labyrinth packings
- F16F 2230/24: Detecting or preventing malfunction, e.g. fail safe
- F16F 2230/30: Sealing arrangements
- F16H 2055/366: {with means providing resilience or vibration damping}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16H: GEARING

## Abstract

A sealing structure with a torsional damper and an oil seal includes a damper pulley and an oil seal. The damper pulley includes, in a disk part of a hub on a front cover side, an annular projection that protrudes between the window and the boss part. The oil seal includes a side lip and a flange. The side lip extends to the inside of an annular groove of the damper pulley. The flange is opposed to the projection of the damper pulley to cover the projection so that a gap is formed between the flange and the projection.

## Claims

### Claim 1

A sealing structure with a torsional damper and an oil seal,
wherein the torsional damper includes a hub, an annular mass body centered about an axis that covers an outer circumference of the hub, and a damper elastic body that is disposed between the hub and the mass body and elastically connects the hub and the mass body to each other, the torsional damper being attached to one end of a rotary shaft with the hub being inserted into a through-hole of an attachment target part,
the oil seal includes an annular seal lip centered about the axis, an annular side lip centered about the axis, and an annular flange centered about the axis, the oil seal being attached in the through-hole of the attachment target part to seal between the hub and the through-hole of the attachment target part,
the hub includes an annular boss part centered about the axis, an annular rim part centered about the axis that is located at an outer periphery of the boss part, and a disk-shaped disk part centered about the axis that connects the boss part and the rim part to each other,
the disk part is provided with an annular projection that protrudes on the attachment target part side, and
the seal lip of the oil seal abuts against the boss part in a slidable manner, the side lip of the oil seal extends to an inside of an annular groove formed between the projection and the boss part in the disk part, and the flange of the oil seal covers the projection so that a gap is formed between the flange and the projection.

### Claim 2 (depends on 1)

The sealing structure with a torsional damper and an oil seal according to claim 1, wherein water and oil repellent agent is applied on an outer periphery side part of the flange.

### Claim 3 (depends on 1)

The sealing structure with a torsional damper and an oil seal according to claim 1, wherein the projection includes a discharge part, the discharge part having a plurality of grooves that extend toward an outer periphery side and form a flow of a fluid toward the outer periphery side along with the rotation about the axis.

### Claim 4 (depends on 1)

The sealing structure with a torsional damper and an oil seal according to claim 1, wherein the flange, at the outer periphery side part, includes an annular protrusion that protrudes toward the outer periphery side, and the protrusion abuts against the attachment target part.

### Claim 5 (depends on 1)

The sealing structure with a torsional damper and an oil seal according to claim 1, wherein the disk part includes a window that passes through the disk part, and the projection protrudes from between the window and the boss part.