the gearwheel 200 during the process of synchronising the rotational speeds of the first and second parts in fig1 b the synchroniser ring 210 is shown in its first axial and rotational positions where its first blocking surface 212 can interact with the second blocking surface 202 of the gearwheel 200 the synchroniser ring 210 further comprises a mating conical friction surface 213 which is adapted to interact with the conical friction surface 112 of the engaging sleeve 110 in order to synchronise the speeds of the input shaft 100 and the gearwheel 200 by means of friction during synchronisation the frictional force on the synchroniser ring 210 act as to press the first blocking surface 212 against the second blocking surface 202 the shapes of the blocking surfaces preventing the synchroniser ring 210 from moving axially in the direction of the gearwheel 200 the function of the blocking surfaces is well known to the person skilled in the art furthermore an axial positioning resilient member 220 is arranged to act upon the synchroniser ring 210 and the gearwheel 200 such that it exercises a force upon the synchroniser ring towards a first axial position in which the blocking surfaces 212 202 of the synchroniser ring 210 and the second part 200 can interact in the example of fig1 a the axial positioning resilient member 220 is constituted by a spring loaded plunger fig2 a shows a cross sectional layout and fig2 b shows a cut in the plane of the engaging teeth of the synchronising device 1 when the speeds of the input shaft 100 and the.