Cover for a gear motor unit for an electric disc brake actuator, and gear motor unit comprising such a cover

A cover for a motor gear unit for an electric actuator for a brake, comprising:

• said motor gear unit including a housing enclosing an electric motor and a reduction gear mechanism mechanically connected to said electric motor to provide at the output of said reduction gear mechanism a rotational drive of a shaft along an output axis;
• said reduction gear mechanism comprising an epicyclic gear system comprising planet gears meshing with the inner surface of a toothed ring gear fixed in rotation, which is mounted in a recess of the housing and has a ring gear axis defining an axial direction;
• said housing having an opening for access to said recess, making it possible to axially insert said gear system therein or at least said toothed ring gear;
• said toothed ring gear having a free edge directed towards said access opening;
• said cover being designed to close the access opening, and
• comprising an axial projection, capable of being positioned at least partially bearing against the free edge of said ring gear when the cover closes said opening;
• and
• said projection having on a free end opposite the free edge of the ring gear at least one elastically deformable element capable of at least partially bearing against said free edge of the ring gear, so as to hold said ring gear in the housing in said axial direction.