Two-lip seal, having two axial lips, for a transmission member, lubrication system for a transmission member, and electromotive unit

The double-lip axial seal addresses the challenge of maintaining effective lubrication in inaccessible areas by retaining oil in a local reservoir, ensuring efficient lubrication even after prolonged vehicle stops with minimal wear and compact design.

WO2026073883A1 Publication Date: 2026-04-09AMPERE SAS
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Patent Information

Application Number
PCT/EP2025/077872
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-10-02
Filing Date
2025-09-29
Publication Date
2026-04-09

AI Technical Summary

Technical Problem

Existing lubrication systems for transmission components, particularly in electric or hybrid vehicles, struggle to ensure effective and efficient lubrication of inaccessible areas like the differential mechanism, especially after prolonged vehicle stops, due to oil path drying out and delayed re-supply.

Method used

A double-lip axial seal is employed, comprising a fixing portion and a working portion made of flexible organic material, with a recess for forming a local oil chamber, allowing for a retained oil reserve that is mobilized quickly during vehicle stops, and a configuration that allows for small relative movements without performance loss.

Benefits of technology

The double-lip axial seal ensures fast and efficient lubrication of all elements, maintaining lubrication even after prolonged stops by retaining a quantity of oil in a local reservoir, promoting compactness and durability with minimal wear.

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Abstract

The invention relates to a two-lip seal (11), having two axial lips, for fitting to a transmission member to be lubricated, said two-lip seal comprising an attachment portion (12) and a working portion (13), the attachment portion comprising a tubular part (12a) received in a cylindrical bearing, the working portion comprising a first lip (15) configured to bear on an annular rotating bearing surface (F15) and a second lip (16) configured to bear on an annular stationary bearing surface (F16) belonging to a transmission member housing, the working portion being manufactured from a flexible organic material, wherein the two-lip seal having two axial lips contributes to delimiting a first annular oil chamber (G4) forming a local oil reserve (RH1), the second lip (16) comprising a recess (16a) forming a passage notch (11b) for the passage of oil. The invention also relates to a transmission member comprising such a seal.
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