DRIVE MECHANISM WITH NOISE REDUCTION

The disclosure refers to a drive mechanism for a drug delivery device with a reduced operating loudness, wherein the drive mechanism comprises a dose selector (80), a housing (10) and a ratchet with agear element comprising a plurality of gear teeth (121) connected with the dose selector and a pawl element rotationally constrained to the housing comprising at least one pawl tooth (43), wherein the at least one pawl tooth engages with the gear teeth and is located opposite to the gear teeth, wherein one of the gear element and the pawl element moves forth and back relative to the other elementof the gear element and the pawl element along a first direction for de-engagement and re-engagement of the opposite gear teeth and at least one pawl tooth when the gear element rotates relative to the housing during dose setting using the dose selector, wherein the pawl element and/or the gear element comprises a noise reduction characteristic at its/their surface which dampens the noise produced when the tooth or teeth