Abstract: A drive unit comprising at least one motor, at least one drive shaft and at least one connection shaft, wherein the connection shaft includes at least one receiving recess having a receiving opening at a first end side and is formed closed at a second end side. A first axial portion of the receiving recess has first dimensional tolerance characteristics with respect to the diameter, and the drive shaft is at least partially inserted into the receiving recess. A second axial portion of the receiving recess has second dimensional tolerance characteristics with respect to the diameter, and the first dimensional tolerance characteristics are different from the second dimensional tolerance characteristics, so that a clearance fit or transition fit is formed in the first portion between the drive shaft and the connection shaft and an interference fit is formed in the second portion between the drive shaft and the connection shaft.

Abstract: A drive unit comprising at least one motor, at least one drive shaft and at least one connection shaft, wherein the connection shaft includes at least one receiving recess having a receiving opening at a first end side and is formed closed at a second end side. A first axial portion of the receiving recess has first dimensional tolerance characteristics with respect to the diameter, and the drive shaft is at least partially inserted into the receiving recess. A second axial portion of the receiving recess has second dimensional tolerance characteristics with respect to the diameter, and the first dimensional tolerance characteristics are different from the second dimensional tolerance characteristics, so that a clearance fit or transition fit is formed in the first portion between the drive shaft and the connection shaft and an interference fit is formed in the second portion between the drive shaft and the connection shaft.

Abstract: A liquid dispensing pump includes a lead screw having a lead screw shaft extending along a lead screw axis, and the lead screwing is operably connected to a piston connected to a liquid reservoir. A thrust bearing is connected to the lead screw and configured to support an axial force on the lead screw when dispensing liquid. A magnet is engaged to the thrust bearing so as to move in response to the axial force on the lead screw. A magnetic transducer is mounted in proximity to the magnet and configured to generate an output signal in responsive to the magnet move.