1. A dose-setting mechanism for a drug delivery device, wherein said mechanism comprises: an outer case； an inner case that has an outer groove, wherein said inner case is configured to direct the drive in order to dose the dose specified by the specified dose-setting mechanism ； a needle with a scale located between the outer case and the inner case, wherein the sleeve with the scale is in rotational engagement with the specified outer groove of the inner case； where the specified sleeve with a scale is made to rotate with respect to both the outer case and the inner case, the time of setting the dose and is arranged to move both from the outer case and the inner case, characterized in that the inner case contains an internal spiral groove. 2. The dose setting mechanism according to claim 1, wherein the internal spiral groove is configured to direct the spiral movement of said drive during dose dosing. The dose setting mechanism according to claim 1 or 2, wherein said drive comprises a first drive part and a second drive part, wherein the first or second drive part preferably comprises a plurality of drive components. The dose-setting mechanism according to claim 1, wherein the mechanism further comprises a dose limiter, the dose limiter being in a grooved connection with a spiral groove of the inner case. The dose setting mechanism according to claim 4, wherein said dose limiter comprises an internal spiral groove that is operatively associated with a spiral groove made on said drive. The dose-setting mechanism according to claim 1, which1. Задающий дозу механизм для устройства для доставки лекарственного средства, где указанный механизм содержит:внешний корпус；внутренний корпус, который имеет наружную канавку, при этом указанный внутренний корпус выполнен с возможностью направлять привод для того, чтобы дозировать дозу, заданную указанным задающим дозу механизмом； игильзу со шкалой, расположенную между внешним корпусом и внутренним корпусом, причем гильза со шкал
