Abstract: An aluminum cast part of a motor vehicle includes at least two upper walls rising from a bottom wall to form a passage, and at least two lower walls extending the upper walls beyond the bottom wall. The upper and lower walls form, with the bottom wall, a cross-section transverse to the passage which is generally H-shaped. In one or more predetermined cross-sections, at least one upper inner rib extends inside the H and transversely to the upper walls and the bottom wall, at least one outer rib extends outside the H to form an extension of the upper inner rib, and at least one lower inner rib extends inside the H to form an extension of the upper inner rib. A height of the upper inner rib in a central area of the H is compensated for by a height of the lower inner rib in the central area.

Abstract: An aluminum cast part of a motor vehicle includes at least two upper walls rising from a bottom wall to form a passage, and at least two lower walls extending the upper walls beyond the bottom wall. The upper and lower walls form, with the bottom wall, a cross-section transverse to the passage which is generally H-shaped. In one or more predetermined cross-sections, at least one upper inner rib extends inside the H and transversely to the upper walls and the bottom wall, at least one outer rib extends outside the H to form an extension of the upper inner rib, and at least one lower inner rib extends inside the H to form an extension of the upper inner rib. A height of the upper inner rib in a central area of the H is compensated for by a height of the lower inner rib in the central area.