# US 11,306,773 B2 · Wheel bearing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,773 B2 - Document ID: US11306773B2 - Status: Granted - Kind: B2 - Application number: 16/332,576 - Filed: 2017-09-08 - Published: 2021-10-21 - Granted: 2022-04-19 - Earliest claimed: 2016-09-14 - Assignees: Ntn Corporation - Applicants: Ntn Corporation - Inventors: Ryo Konishi; Tsukasa Watanabe - Web page: https://patentgrep.com/patent/US11306773B2 ## CPC - F16C 19/183: {with two rows at opposite angles} - F16C 33/805: {in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips} - F16C 33/7823: {of sealing lips} - F16C 33/7879: {with a further sealing ring} - F16J 15/3232: having two or more lips - F16C 19/186: {with three raceways provided integrally on parts other than race rings, e.g. third generation hubs} - F16C 2326/02: Wheel hubs or castors - 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 ## Abstract A wheel bearing device (1) provided with an outer sealing member (7) in which: a core metal (8) having formed therein multiple seal lips is fitted to the outer opening of an outer ring (2); a metal ring (9) is fitted to the outer peripheral section of a hub ring (3) so as to oppose the core metal. The multiple seal lips are brought into contact with the metal ring, so that a portion between the outer ring and the hub ring is sealed. An annular outer member side weir part (11f) that protrudes to the outer side, in a radial direction, as compared to the outer edge of the metal ring so as to surround the metal ring is provided to the core metal, and an outer member side expanded-diameter part (8g) that holds grease is formed in the inner peripheral surface of the outer member side weir part. ## Claims ### Claim 1 A wheel bearing device comprising: an outer member integrally provided with double-row outer rolling faces on an inner circumference of the outer member; an inner member including a hub wheel provided with an axially-extending narrowed stepped portion on an outer circumference of the hub wheel and at least one inner wheel press-fitted into the narrowed stepped portion, the inner member having double-row inner rolling faces opposed to the double-row outer rolling faces on an outer circumference of the inner member; double-row rolling elements rollably accommodated between the inner rolling faces and the outer rolling faces; and a seal member for sealing a space between the outer member and the inner member by fitting a core metal to an opening of the outer member, fitting a metallic ring to the outer circumference of the inner member so as to be opposed to the core metal, the core metal being provided with an elastic seal lip, and causing the metallic ring to contact the seal lip, wherein a ring shaped outer member-side weir portion protruding further than an outer edge of the metallic ring in a radial outward direction to surround the metallic ring is provided with the core metal, and an outer member-side expanded portion for holding a lubricant is formed on an inner circumferential face of the outer member-side weir portion. ### Claim 2 (depends on 1) The wheel bearing device according to claim 1, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip. ### Claim 3 (depends on 1) The wheel bearing device according to claim 1, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, and wherein an inner member-side expanded portion for holding the lubricant is formed on an inner circumferential face of the inner member-side weir portion. ### Claim 4 (depends on 1) The wheel bearing device according to claim 1, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, and wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction. ### Claim 5 (depends on 1) The wheel bearing device according to claim 1, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction, and wherein at least one of the outer member-side expanded portion and the inner member-side expanded portion is formed in a ring like ring shaped groove. ### Claim 6 (depends on 1) The wheel bearing device according to claim 1, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction, and wherein at least one of the outer member-side expanded portion and the inner member-side expanded portion is formed on a ring like ring shaped concave curved face. ### Claim 7 (depends on 1) The wheel bearing device according to claim 1, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction, and wherein an inner diameter of at least one of the outer member-side weir portion and the inner member-side weir portion is gradually reduced toward the tip. ### Claim 8 A wheel bearing device comprising: an outer member integrally provided with double-row outer rolling faces on an inner circumference of the outer member; an inner member including a hub wheel provided with an axially-extending narrowed stepped portion on an outer circumference of the hub wheel and at least one inner wheel press-fitted into the narrowed stepped portion, the inner member having double-row inner rolling faces opposed to the double-row outer rolling faces on an outer circumference of the inner member; double-row rolling elements rollably accommodated between the inner rolling faces and the outer rolling faces; and a seal member for sealing a space between the outer member and the inner member by fitting a core metal to an opening of the outer member, fitting a metallic ring to the outer circumference of the inner member so as to be opposed to the core metal, the core metal being provided with an elastic seal lip, and causing the metallic ring to contact the seal lip, wherein a ring shaped outer member-side weir portion protruding further than an outer edge of the metallic ring in a radial outward direction to surround the metallic ring is provided with the outer member, and an outer member-side expanded portion for holding a lubricant is formed on an inner circumferential face of the outer member-side weir portion. ### Claim 9 (depends on 8) The wheel bearing device according to claim 8, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip. ### Claim 10 (depends on 8) The wheel bearing device according to claim 8, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, and wherein an inner member-side expanded portion for holding the lubricant is formed on an inner circumferential face of the inner member-side weir portion. ### Claim 11 (depends on 8) The wheel bearing device according to claim 8, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, and wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction. ### Claim 12 (depends on 8) The wheel bearing device according to claim 8, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction, and wherein at least one of the outer member-side expanded portion and the inner member-side expanded portion is formed in a ring shaped groove. ### Claim 13 (depends on 8) The wheel bearing device according to claim 8, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction, and wherein at least one of the outer member-side expanded portion and the inner member-side expanded portion is formed on a ring shaped concave curved face. ### Claim 14 (depends on 8) The wheel bearing device according to claim 8, wherein the metallic ring is provided with a ring shaped inner member-side weir portion protruding toward the outer member on a radial outer side of a contact position between the metallic ring and the seal lip, wherein a tip of the inner member-side weir portion and the outer member-side expanded portion overlap each other in the radial direction, and wherein an inner diameter of at least one of the outer member-side weir portion and the inner member-side weir portion is gradually reduced toward the tip.