at said point p preferably the equipment shafts 31 32 are orthogonal to the main shaft 120 but such a condition is not necessary fig5 illustrates the geometric feasibility of the architecture as well as the rotation speeds of the various shafts the speed of rotation of part i is designated u03c9 i setting d 122 gt d 123 and consequently z 122 gt z 123 and arbitrarily u03b4 122 lt u03b4 123 with u03b4 122 u03b4 310 u03b4 123 u03b4 320a 90 u00b0 orthogonality of the shafts u03c9 31 z 310 z 122 u00b7 u03c9 120 tan u03b4 122 u03c9 32 z 320 z 123 u00b7 u03c9 120 tan u03b4 123 but u03b4 122 gt u03b4 123 hence u03c9 31 gt u03c9 32 two coaxial equipment shafts 31 32 are thus obtained which rotate at different speeds the speeds of the two shafts 31 32 are thus independent that is to say that by selecting suitable parameters the speeds can be adjusted independently of one another even if the two equipment shafts 31 32 are driven by the same main shaft 120 in fact the reduction ratios depend directly on the number of teeth of the bevel gears 122 123 of the main shaft 120 and the bevel gears 310 320 of the equipment 30 the structure of the agb is similar to that of the first embodiment with the connection shaft 110 and the main shaft 120 with the first bell crank r 1 the main shaft 120 comprises a.