The invention relates to a drive mechanism for an injection device for setting and dispensing a dose of a medicament, comprising: a tubular housing component (12, 45) extending in the axial direction (z) and including an inner thread (46), A tubular display member (80) having an outer thread (81) engaged with the inner thread (46), and for the display member (80) between a dose setting position (S) and a dose dispensing position An axially displaceable dose member (90), wherein: the display member (80) is disposed on its outer periphery at a dose member (90) from the dose setting position (S) towards the dose dosing position. At least one blocking member (87) that axially engages the blocking structure (18) in the inwardly facing side wall portion (12a) of the housing component (12, 45) so as to prevent axial displacement of the housing component (12, 45). ) Including drive mechanism .本発明は、薬剤の用量を設定し投薬する注射デバイスの駆動機構であって、－ 軸方向（ｚ）に延び内側ねじ山（４６）を含む管状のハウジング構成要素（１２、４５）と、－ 内側ねじ山（４６）に係合される外側ねじ山（８１）を有する管状のディスプレイ部材（８０）と、－ 用量設定位置（Ｓ）と用量投薬位置との間でディスプレイ部材（８０）に対して軸方向に変位可能な用量部材（９０）と：を含み、－ ここで、ディスプレイ部材（８０）は、その外周に、用量設定位置（Ｓ）から用量投薬位置の方に向かう用量部材（９０）の軸方向変位を阻止するように、ハウジング構成要素（１２、４５）の内向きの側壁部分（１２ａ）にある阻止構造（１８）に軸方向に係合する、少なくとも１つの阻止部材（８７）を含む、駆動機構に関する。
