Motor group for watches

A motor group, comprising:

• a plurality of motor modules, each of the plurality of motor modules including
• a plate configured to secure said module to a display mechanism,
• a motor configured to drive at least one display wheel set, and
• a center pipe fixed on said plate, said center pipe including at least a main guide bearing surface configured to guide the at least one display wheel set in rotation about a main axis, the at least one display wheel set being an outer wheel set surrounding said center pipe and being guided on the main guide bearing surface, wherein
• said center pipe includes at least one axial stop configured to limit an axial movement in a direction of said main axis between said center pipe and said display wheel set based on a predetermined value,
• said one or more axial stop includes:
• a protruding surface of said center pipe that touches said display wheel set, the protruding surface protruding in a radial direction orthogonal to the direction of said main axis;
• and
• a second stop surface of said center pipe, and
• a relative displacement of said outer wheel set with respect to said center pipe is limited:
• by an abutting engagement between the second stop surface of said center pipe and a second upper face of said outer wheel set, and
• by an abutting engagement between a second end face of said outer wheel set and an intermediate face of said center pipe, an abutting surface being perpendicular to said main axis,
• the second stop surface and the intermediate face are comprised in a same said center pipe, and
• said second upper face and said second end face are comprised in a same said outer wheel set.