# US 2025/0146531 A1 · Sealing device for bearing unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146531 A1 - Document ID: US20250146531A1 - Status: Published application - Kind: A1 - Application number: 18/386,294 - Filed: 2023-11-02 - Published: 2025-05-08 - Earliest claimed: 2023-11-02 - Assignees: Aktiebolaget Skf - Applicants: Aktiebolaget Skf - Inventors: Daniele Duch - Web page: https://patentgrep.com/patent/US20250146531A1 ## CPC - F16C 33/805: {in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips} - B60B 27/0073: {characterised by sealing means} - F16C 33/7823: {of sealing lips} - F16C 33/7883: {mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section} - 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 - B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION ## Abstract A sealing device for a bearing unit, having a stationary part, which is in turn provided with a first metal screen, an elastomer coating co-moulded on to the first screen, and a radially inner contact lip belonging to the elastomer coating, and a rotatable part provided with a second metal screen with which the contact lip makes a sliding contact, the sealing device being provided with at least one appendage which faces a radially inner flanged ring of the bearing unit and interacts with this flanged ring to form a barrier against the entry of contaminants. ## Claims ### Claim 1 A sealing device for a bearing unit comprising: a stationary part comprising: a first metallic screen, an elastomer coating, co-moulded on the first metallic screen, a contacting lip, wherein the contacting lip is radially internal of the first metallic screen, wherein the elastomer coating comprises the contacting lip; and a rotatable part provided with a second metallic screen on which the contacting lip makes a sliding contact; wherein the stationary part further comprises at least one appendage extending towards a flanged portion of the rotatable part and cooperates with the flanged portion to create a barrier against the entry of contaminants within the sealing device; wherein the at least one appendage is made of an elastomer, wherein the at least one appendage is part of the elastomer coating, and wherein the at least one appendage comprises a radially outer and axially outer portion of the elastomer coating; wherein the at least one appendage comprises two radially spaced appendages. ### Claim 2 (depends on 1) The sealing device of claim 1, wherein the width of a meatus (G1) which forms between the radially outer and axially outer end of the appendage and the flanged ring is between 0 mm and 1.5 mm. ### Claim 3 (depends on 1) The sealing device of claim 1, wherein the width of a meatus (G1) which forms between the radially outer and axially outer end of the appendage and the flanged ring is about 0.1 mm. ### Claim 4 (depends on 1) The sealing device of claim 1, wherein the at least one appendage is made of metal, wherein the at least one appendage is part of the first metallic screen and comprises the radially outer and axially outer portion of the first metallic screen. ### Claim 5 (depends on 4) The sealing device of claim 4, wherein the width of a meatus (G2) which forms between the radially outer and axially outer end of the appendage and the flanged ring between 0.6 mm and 1.5 mm. ### Claim 6 (depends on 1) The sealing device of claim 1, further comprising an additional elastomer coating co-moulded on the second screen. ### Claim 7 (depends on 1) A bearing unit equipped with the sealing device of claim 1, housed in a cavity, the bearing unit further comprising: a flanged radially inner ring, wherein the flanged radially inner ring is rotatable, a radially outer ring, wherein the radially outer ring is stationary an additional radially inner ring, rotatable, mounted on, and integral with the flanged radially inner ring, a plurality of rolling bodies interposed between the radially outer ring and the radially inner rings. ### Claim 8 A sealing device for a bearing unit comprising: a stationary part comprising: a first metallic screen, an elastomer coating, co-moulded on the first metallic screen, a contacting lip, wherein the contacting lip is radially internal of the first metallic screen, wherein the elastomer coating comprises the contacting lip; and a rotatable part provided with a second metallic screen on which the contacting lip makes a sliding contact; wherein the stationary part further comprises at least one appendage extending towards a flanged portion of the rotatable part and cooperates with the flanged portion to create a barrier against the entry of contaminants within the sealing device; wherein a radially outer end of the additional elastomer coating extends radially towards a cylindrical portion of the elastomer coating. ### Claim 9 A sealing device for a bearing unit comprising: a stationary part comprising: a first metallic screen, an elastomer coating, co-moulded on the first metallic screen, a contacting lip, wherein the contacting lip is radially internal of the first metallic screen, wherein the elastomer coating comprises the contacting lip; and a rotatable part provided with a second metallic screen on which the contacting lip makes a sliding contact; wherein the stationary part further comprises at least one appendage extending towards a flanged portion of the rotatable part and cooperates with the flanged portion to create a barrier against the entry of contaminants within the sealing device; wherein a radially external end of the additional elastomer coating faces a cylindrical portion of the first screen.