Hydraulic camshaft manufacturer (1) of a wing cell type, with a stator (2) and a radial rotor (2) rotationally located within the stator (3),where the stator (2) has a cover-clear section (4), which cover section (4) covers the rotor (3) at least partially to an axial front side (5) and in an operating condition surrounds a non-shaft-resistant insertion area (6) radially from the outside, thereby characterized, that the cover section (4) on its radial inner side (7) has at least one survey (8a, 8b) that extends so far radially inwards that it forms, with the rotor (3), a background section (9) prepared for the consistent absorption of the injection area (6), where the inside (7) is formed by a passage hole (10) of the cover section (4),where the passage hole (10) has a base area (23) which is geometrically interrupted by at least one survey (8a, 8b) in at least one interior area;
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