Dose delivery device with transmission

In a dose setting mode of the dose delivery device, the dose selector (74) is rotated to turn the nut (16) such that the nut moves rearward through a first axial distance (d1) along a thread (8) of the piston rod (6). The transmission mechanism transmits the axial movement of the nut (16) to a connector (20) that moves rearward through a second axial distance (d2) without rotation. In a dose delivery mode of the device, the dose selector (74) is pushed forward and drives the connector (20) to move forward through a second axial distance (d2). The transmission mechanism transmits the axial movement of the connector (20) to the nut (16) which urges the piston rod (6) forward through a first axial distance (d1) without rotation. The transmission mechanism includes a first gear (28) that rotates relative to the housing (4) without axial movement and a second gear (30) that rotates relative to the nut (16) without axial movement. 在剂量输送装置的剂量设定模式中，剂量选择器(74)旋转以转动螺母(16)，从而螺母沿着活塞杆(6)的螺纹(8)向后移动通过第一轴向距离(d1)。传动装置机构将螺母(16)