Blade wheel

A bladed wheel (10) for a hydraulic transmission apparatus for a motor vehicle, having the general form of a half torus, and comprising, arranged axially and successively in this order, an endless front shell (12) which has the general form of a half torus of large outer diameter, and an endless rear shell (16) coaxial with the front shell (12) and having the general form of a half torus of small outer diameter, between which there is arranged a set of blades (14), the blades (26) of which extend radially, circumferentially and axially between a concave wall (20) of the front shell (12) and a convex wall (40) of the rear shell (16) in facing relationship therewith, wherein the rear shell (16), the set of blades (14), and the front shell (12), are formed separately and are then assembled together so as to constitute the bladed wheel (10), the blades (26) of the bladed wheel (10) being joined at least partly together and being made by molding, and wherein

• the set of blades (14) is bounded axially by a rear envelope surface (34) which is partly complementary to the convex wall (40) of the rear shell (16), and by a front envelope surface (32) which is complementary with the concave wall (20) of the front shell (12);
• and
• the blades (26) are joined together by means of a small annular ring portion (28) which is in cooperation with an annular inner centering edge (22) of the front shell (12), and a large annular ring portion (30) which is in cooperation with an annular external centering edge (24) of the front shell (12).