Gearbox and motor vehicle

The invention relates to a gearbox and a motor vehicle. The gearbox includes a housing, a planetary gear set including a ring gear mounted within the housing, and a clamp ring, an inner surface of the housing has an axial section and a first radial section, the first radial section extends radially inward from one end of the axial section, the ring gear is mounted radially inward of the axial section, so that the peripheral surface of the ring gear outer faces the axial section; and the first axial end face of the ring gear faces and is able to abut against the first radial section. The housing is provided with a first annular groove formed in the axial section, the gear ring is provided with a second annular groove formed in the outer peripheral surface, the first annular groove and the second annular groove are aligned in the axial direction, the clamp ring is installed between the first annular groove and the second annular groove, so that the axial position of the gear ring relative to the shell is restra