Hub unit bearing

The hub unit bearing design with a core metal configuration featuring a large-diameter cylindrical portion and labyrinth seal addresses foreign matter ingress and sealing performance issues, enhancing durability and rigidity.

JP2026096382APending Publication Date: 2026-06-15NSK LTD
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Patent Information

Application Number
JP2024210164
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-03
Publication Date
2026-06-15

AI Technical Summary

Technical Problem

Conventional hub unit bearings face issues with foreign matter ingress due to uneven fitting forces of the core metal in the seal ring, compromising sealing performance and rigidity, especially in harsh environments like muddy water exposure.

Method used

A hub unit bearing design with a core metal having a large-diameter cylindrical portion externally fitted to the outer ring, a bent portion, a small-diameter cylindrical portion, and a connecting portion, forming a labyrinth seal to prevent foreign matter ingress and enhance sealing performance.

Benefits of technology

The design effectively prevents foreign matter entry, maintains sealing performance, and enhances moment rigidity by ensuring uniform fitting forces across the core metal, thereby improving durability and handling stability.

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Abstract

The present invention provides a hub unit bearing that prevents foreign matter from easily entering between the outer ring and the core metal of the seal ring fixed to the outer ring. [Solution] The core metal 39 of the seal ring 30 has a large diameter cylindrical core portion 42, a bent portion 43, a circular core portion 44, a small diameter cylindrical core portion 45, and a connecting portion 46. The large diameter cylindrical core portion 42 has its axial inner portion fitted onto the axial outer end of the outer ring 2 by interference fit, and its axial outer portion protrudes axially beyond the axial outer end face of the outer ring 2. The bent portion 43 bends radially outward from the axial inner end of the large diameter cylindrical core portion 42. The circular core portion 44 has its axial inner surface abutting against the axial outer end face of the outer ring 2. The small diameter cylindrical core portion 45 extends axially outward from the radial outer end of the circular core portion 44. The connecting portion 46 bends radially inward from the axial outer end of the large diameter cylindrical core portion 42 and connects to the axial outer end of the small diameter cylindrical core portion 45.
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