US Patent 12126239 Electric power unit

In an electric power unit which accommodates at least an electric motor in a housing, polygonal rib regions in which polygonal ribs are respectively formed are provided on at least two surfaces of an outer peripheral surface of the housing, and the polygonal rib regions are connected by a circumferential rib. Here, a first axial rib and a second axial rib extending parallel to an axial direction are formed on the outer peripheral surface of the housing, and the polygonal rib region is provided in a portion sandwiched between the first axial rib and the second axial rib. Further, the circumferential rib is formed over the entire part of the polygonal rib region in a circumferential direction. Note that the polygonal rib is a honeycomb rib.