# US 11,440,226 B2 · Compression vulcanization molding mold for rolling bearing seal, and method for manufacturing rolling bearing seal

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- Number: US 11,440,226 B2
- Document ID: US11440226B2
- Status: Granted
- Kind: B2
- Application number: 16/479,140
- Filed: 2017-10-17
- Published: 2019-11-21
- Granted: 2022-09-13
- Earliest claimed: 2017-01-26
- Assignees: Ntn Corporation; Nakanishi Metal Works Co., Ltd.
- Applicants: Ntn Corporation; Nakanishi Metal Works Co., Ltd.
- Inventors: Katsuaki Sasaki; Takahiro Wakuda; Takashi Kaneike
- Web page: https://patentgrep.com/patent/US11440226B2

## CPC

- B29C 43/18: incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles {(B29C43/206 takes precedence)}
- B29C 33/02: with incorporated heating or cooling means
- B29C 33/12: with incorporated means for positioning inserts, e.g. labels {(positioning reinforcements B29C70/541)}
- B29C 33/42: characterised by the shape of the moulding surface, e.g. ribs or grooves
- B29C 35/02: Heating or curing, e.g. crosslinking or vulcanizing {during moulding, e.g. in a mould}(cold vulcanisation B29C35/18 {; vulcanising tyres, presses therefor B29D30/0601})
- B29C 43/36: Moulds for making articles of definite length, i.e. discrete articles
- B29C 43/38: with means to avoid flashes {(B29C43/40 takes precedence)}
- B29C 45/38: Cutting-off equipment for sprues or ingates
- F16C 33/78: with a diaphragm, disc, or ring, with or without resilient members {(F16C33/761 takes precedence)}
- F16C 33/7833: {Special methods of manufacture}
- F16J 15/3204: with at least one lip
- B29C 2043/3602: {with means for positioning, fastening or clamping the material to be formed or preforms inside the mould}
- B29K 2105/246: {Uncured, e.g. green}
- B29K 2705/00: Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
- B29L 2031/26: Sealing devices, e.g. packaging for pistons or pipe joints
- F16C 19/06: with a single row or balls
- 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)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- 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

The rolling bearing seal includes a core metal and rubber adhered to the core metal by vulcanization. The rubber includes: a seal lip portion having, over the entire circumference in the circumferential direction, a plurality of projections that extend inward in the radial direction from the inner diameter side of the core metal, and slides on a seal sliding surface of an inner ring of a rolling bearing; and an attachment portion that is attached to an outer ring of the rolling bearing. A compression vulcanization molding mold includes a female mold and a male mold. The female mold has a guide portion for positioning the core metal and a rugged shape forming the projections on the seal lip portion. The male mold has an inner-diameter-side burr groove and an outer-diameter-side burr groove and the shape of a radially outermost portion of the inner-diameter-side burr groove is formed in a circle.

## Claims

### Claim 1

A compression vulcanization molding mold for a rolling bearing seal, which is used for compression vulcanization molding of the rolling bearing seal that separates, from outside, a bearing internal space formed between an inner ring and an outer ring of a rolling bearing, wherein
the rolling bearing seal includes an annular core metal and rubber adhered to the core metal by vulcanization,
the rubber includes: a seal lip portion that extends inward in a radial direction from an inner diameter side of the core metal, and slides on a seal sliding surface of the inner ring in a circumferential direction; and an attachment portion that extends outward in the radial direction from an outer diameter side of the core metal, and is attached to the outer ling, and
the seal lip portion has, over an entire circumference in the circumferential direction, a plurality of projections to form, between the seal sliding surface and the seal lip portion, oil passages that allow communication between the bearing internal space and the outside, an end of the seal lip portion curves to project toward the seal sliding surface, an edge of the end of the seal lip portion, which includes at least a portion of one of the projections, contacts the seal sliding surface, and each of the projections being formed over the entire circumference in a circumferential direction of the seal lip portion of the rolling bearing seal,
the mold comprising:
a female mold and a male mold which form an annular cavity for molding the rubber, wherein
the female mold has a guide portion for positioning the core metal, and a rugged shape forming the projections on the seal lip portion, and
the male mold has an inner-diameter-side burr groove and an outer-diameter-side burr groove respectively at an inner-diameter-side peripheral portion and an outer-diameter-side peripheral portion of the cavity, and a shape of a radially outermost portion of the inner-diameter-side burr groove is formed in a circle.

### Claim 2 (depends on 1)

The compression vulcanization molding mold for rolling bearing seal, according to claim 1, wherein
a diameter d (mm) of the circle represented by the shape of the radially outermost portion of the inner-diameter-side burr groove is set within a range of (D−0.2)≤d≤D relative to a diameter D (mm) of a circle in contact with an end of each of the projections.

### Claim 3 (depends on 1)

A rolling bearing seal manufacturing method for performing compression vulcanization molding of a rolling bearing seal using the compression vulcanization molding mold for rolling bearing seal according to claim 1, the method comprising:
opening the mold and placing the core metal at the guide portion of the female mold;
placing an unvulcanized rubber material in the female mold;
closing the mold and pressing and heating the mold to vulcanize the rubber material; and
opening the mold and taking the rolling bearing seal that is a molded product, out of the mold.

### Claim 4 (depends on 2)

A rolling bearing seal manufacturing method for performing compression vulcanization molding of a rolling bearing seal using the compression vulcanization molding mold for rolling bearing seal according to claim 2, the method comprising:
opening the mold and placing the core metal at the guide portion of the female mold;
placing an unvulcanized rubber material in the female mold;
closing the mold and pressing and heating the mold to vulcanize the rubber material; and
opening the mold and taking the rolling bearing seal that is a molded product, out of the mold.