# US 11,298,858 B2 · Method for manufacturing sealing device, and sealing device

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- Number: US 11,298,858 B2
- Document ID: US11298858B2
- Status: Granted
- Kind: B2
- Application number: 16/353,618
- Filed: 2019-03-14
- Published: 2019-07-11
- Granted: 2022-04-12
- Earliest claimed: 2012-10-30
- Assignees: Nok Corporation
- Applicants: Nok Corporation
- Inventors: Hiroaki Sato; Akira Morio; Daihachi Shojima
- Web page: https://patentgrep.com/patent/US11298858B2

## CPC

- B29C 45/0053: {combined with a final operation, e.g. shaping (injection-compression moulding B29C45/561)}
- F16J 15/108: {Special methods for making a non-metallic packing}
- 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 15/328: Manufacturing methods specially adapted for elastic sealings (moulding B29C)
- F16J 15/56: Other sealings for reciprocating rods
- B29C 2793/0027: Cutting off
- B29C 2793/009: after shaping
- B29K 2101/00: Use of unspecified macromolecular compounds as moulding material {(use of unspecified rubbers B29K2021/00)}
- B29L 2031/265: {Packings, Gaskets}
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.

## Claims

### Claim 1

A sealing device, that is an entirely elastomeric sealing device and is fitted in an annular fitting groove formed on one of two members configured to be reciprocally movable relative to each other, so as to seal an annular gap between these two members, wherein:
on an outer peripheral side thereof, an annular outer peripheral convex portion; and cylindrical surface portions provided on both sides of the outer peripheral convex portion are formed; and
on an inner peripheral side thereof, an annular inner peripheral convex portion; and cylindrical surface portions provided on both sides of the inner peripheral convex portion are formed,
wherein shapes and dimensions of cross sections of the outer peripheral convex portion and the inner peripheral convex portion are the same, and the projection height of the outer peripheral convex portion and the projection height of the inner peripheral convex portion are set within a range from 0.2 mm to 0.4 mm, inclusive.

### Claim 2 (depends on 1)

The sealing device as set forth in claim 1, wherein the sealing device includes two flat sidewall surfaces extending between the inner and outer peripheral side thereof,
the flat sidewall surfaces extends along a majority of a radial thickness of the sealing device, and
the outer peripheral convex portion and the inner peripheral convex portion extend along a majority of an axial thickness of the sealing device.