An injection device comprising: a. a housing having a longitudinal axis; b. a dose selector capable of being rotated about said longitudinal axis with respect to said housing by a user to set a dose of medicament to be ejected from the injection device; c. a spring capable of storing energy necessary for ejecting the dose of medicament from the injection device, wherein the spring is coupled to the dose selector such that a charging force can be transferred from the dose selector to the spring to increase the energy stored by the spring; d. a ratchet arrangement moveable between an engaged state in which the spring is limited from unwinding from a currently selected dose and a disengaged state in which the spring is able to unwind; and e. a drive assembly including a plunger element comprising a lead screw concentrically arranged within and rotationally fixed with respect to a rotatable drive sleeve and capable of providing an axial force for ejecting a dose of medicament from the injection device, via a force path extending between the spring and the plunger element, wherein the drive assembly further comprises f. a drive clutch (350, 342a) moveable from a disengaged state in which said force path from the spring to the plunger element is interrupted and an engaged state in which said force path is continuous and the drive assembly can provide the axial force for ejecting a dose of medicament from the injection device, wherein the drive assembly includes a drive shaft intermediate said spring and said drive sleeve and wherein said drive clutch (350, 342a) comprises splines on said drive sleeve engageable with splines on said drive shaft, or wherein said drive clutch (350, 342a) comprises a drive clutch component having splines on a rear face thereof, the splines being engageable with splines on a front face of said drive sleeve during forward movement of said drive sleeve, and wherein the drive clutch (350, 342a) reaches its fully engaged state before the ratchet arrangement has reached its fully disengaged state. a. a housing having a longitudinal axis; b. a dose selector capable of being rotated about said longitudinal axis with respect to said housing by a user to set a dose of medicament to be ejected from the injection device; c. a spring capable of storing energy necessary for ejecting the dose of medicament from the injection device, wherein the spring is coupled to the dose selector such that a charging force can be transferred from the dose selector to the spring to increase the energy stored by the spring; d. a ratchet arrangement moveable between an engaged state in which the spring is limited from unwinding from a currently selected dose and a disengaged state in which the spring is able to unwind; and e. a drive assembly including a plunger element comprising a lead screw concentrically arranged within and rotationally fixed with respect to a rotatable drive sleeve and capable of providing an axial force for ejecting a dose of medicament from the injection device, via a force path extending between the spring and the plunger element, wherein the drive assembly further comprises f. a drive clutch (350, 342a) moveable from a disengaged state in which said force path from the spring to the plunger element is interrupted and an engaged state in which said force path is continuous and the drive assembly can provide the axial force for ejecting a dose of medicament from the injection device, wherein the drive assembly includes a drive shaft intermediate said spring and said drive sleeve and wherein said drive clutch (350, 342a) comprises splines on said drive sleeve engageable with splines on said drive shaft, or wherein said drive clutch (350, 342a) comprises a drive clutch component having splines on a rear face thereof, the splines being engageable with splines on a front face of said drive sleeve during forward movement of said drive sleeve, and wherein the drive clutch (350, 342a) reaches its fully engaged state before the ratchet arrangement has reached its fully disengaged state.