Patent No. EP4487032 (titled "Transmission Housing With Drilled Oil Pan") was filed by Flender Industriegetriebe on Feb 6, 2023. The application was issued on Dec 10, 2025.
A transmission housing comprises multiple side walls, at least one of which includes housing openings for bearings. On the inner side of a side wall, a rib structure tapers vertically in a funnel shape toward a housing opening to guide spray or lubricating oil. A collecting pan is provided where the funnel-shaped rib structure opens. This collecting pan is formed by a drill hole traversing the side wall, creating a portion situated on the inner side. The drill hole is executed from the outside inward, creating an undercut by not completely penetrating the lower area of the rib structure. The rib structure is initially cast without undercuts, with the bore centered at the rib structure's base point.

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