# US 12,224,643 B2 · Composite oil seal having electric corrosion prevention function

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- Number: US 12,224,643 B2
- Document ID: US12224643B2
- Status: Granted
- Kind: B2
- Application number: 18/198,605
- Filed: 2023-05-17
- Published: 2024-07-25
- Granted: 2025-02-11
- Earliest claimed: 2023-01-20
- Assignees: Pyunghwa Oil Seal Industry Co., Ltd.
- Applicants: Pyunghwa Oil Seal Industry Co., Ltd.
- Inventors: Tae-Hyung Kim; Eun-Min Park; Jae-Hyuk Sung
- Web page: https://patentgrep.com/patent/US12224643B2

## CPC

- H02K 5/124: Sealing of shafts
- F16J 15/3284: characterised by their structure; Selection of materials
- F16J 15/3288: Filamentary structures, e.g. brush seals
- F16J 15/348: {Pre-assembled seals, e.g. cartridge seals}
- F16J 15/3208: provided with tension elements, e.g. elastic rings
- F16J 15/3232: having two or more lips
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

There is provided a composite oil seal having an electric corrosion prevention function, which is mounted on a shaft in a motor housing to prevent leakage of oil in the motor housing. The composite oil seal includes a seal main body, which is formed of an elastic material and has an outer circumferential surface formed to be in tight contact with an inner circumferential surface of the motor housing and at least one lip protruding inwards so as to be in contact with an outer circumferential surface of the shaft, and an electrical path fabric, which is formed by weaving metallic yarns and is mounted to the seal main body to electrically connect the shaft to the motor housing so that current induced in the shaft flows to the motor housing.

## Claims

### Claim 1

A composite oil seal having an electric corrosion prevention function, the composite oil seal being mounted on a shaft in a motor housing to prevent leakage of oil in the motor housing, the composite oil seal comprising:
a seal main body formed of an elastic material, the seal main body having an outer circumferential surface formed to be in tight contact with an inner circumferential surface of the motor housing and at least one lip protruding inwards so as to be in contact with an outer circumferential surface of the shaft; and
an electrical path fabric formed of woven metallic yarns, the electrical path fabric being mounted to the seal main body to electrically connect the shaft to the motor housing so that current induced in the shaft flows to the motor housing,
wherein the electrical path fabric is formed in a circular disc-shape having a central hole through which the shaft passes, an inner rim, an outer rim, a first flat side attached to the seal main body, and a second flat side opposite to the first flat side, and
wherein a diameter of the central hole is smaller than a diameter of the shaft and a diameter of the electrical path fabric is greater than a diameter of the inner circumferential surface of the motor housing such that the inner rim and the outer rim are bent in a direction that the second flat side faces, with the first flat side in direct contact with both the outer circumferential surface of the shaft and the inner circumferential surface of the motor housing.

### Claim 2 (depends on 1)

The composite oil seal according to claim 1, wherein the metallic yarns are unit stainless yarns, each being formed by combining a plurality of stainless yarns, and
wherein the electrical path fabric is a plain weave formed by weaving the unit stainless yarns in such a manner that a warp and a weft cross over and under one another.

### Claim 3 (depends on 1)

The composite oil seal according to claim 1, wherein the metallic yarns are unit stainless yarns, each being formed by combining a plurality of stainless yarns, and
wherein the electrical path fabric is a twill weave formed by weaving the unit stainless yarns in such a manner that warps and wefts cross each other.

### Claim 4 (depends on 1)

The composite oil seal according to claim 1, further comprising:
a rigid frame disposed in the seal main body in order to impart rigidity to the seal main body.

### Claim 5 (depends on 1)

The composite oil seal according to claim 1, wherein the electrical path fabric is coated with a protective film made of a conductive coating material.

### Claim 6 (depends on 5)

The composite oil seal according to claim 5, wherein the protective film is made of polyimide or silicone.