Drive mechanisms suitable for use in drug delivery devices

A drug delivery device comprising:

• a housing defining a window;
• an insert attached to the housing, the insert comprising a maximum dose radial stop, a helical rib extending radially from a surface of the insert;
• a dose dial sleeve rotatable with respect to the insert, a portion of the dose dial sleeve being visible through the window of the housing, the dose dial sleeve defining a helical groove in which the helical rib of the insert is disposed, the helical rib and the helical groove being configured such that rotation of the dose dial sleeve with respect to the insert causes an axial movement of the dose dial sleeve relative to the insert, a projection extending from the dose dial sleeve, the projection having a stop surface, the stop surface extending parallel to a longitudinal axis of the dose dial sleeve and being configured to contact the maximum dose radial stop of the insert when the dose dial is rotated an amount corresponding to a maximum dose;
• a driver comprising a first section of a first diameter and a second section of a second diameter;
• a clutch comprising a plurality of teeth, the clutch being configured to releasably, rotationally couple the dose dial sleeve to the driver;
• and
• a threaded piston rod extending through the housing, the threaded piston rod being configured to advance axially as the driver is rotated.