By deflecting the moment in the joint, the additional moment M_{Z} acts on the fork. For the joint shown in Fig. 21, M_{2} and M_{Z }are calculated by dividing the moments vectors: Fig. 21: Position 0° and 180° M_{2 }= M_{1} · cos* ß* M_{Z }= M_{1} · sin* ß* Position 90° and 270° M_{2 }= M_{1} · 1/cos* ß* M_{Z }= M_{1} · tan* ß* **7.1 Bearing Forces in Z-Arrangement** The additional moment M_{Z} exerts forces on the bearing which apply bending stresses to the shaft. Fig. 22 shows the additional moments and bearing forces in the 0° and 90° position. Fig. 22: The bearing forces swing between zero and maximum twice per rotation. **7.2 Bearing Forces in W-Arrangement** According to Fig. 23, in this arrangement the following additional moments and bearing forces apply: Fig. 23: The bearing forces swing between minimum and maximum twice per rotation. **7.3 Displacement Force on Propeller Shafts with Length Extension** To displace the sliding piece under the effect of torque, a displacement force L is required which must be supported by the bearing A, B, C, D. The maximum displacement force is: where µ | = | Coefficient of friction. For hardened, nitrated and/or phosphatized parts, µ = 0,1 can be assumed; for rilsan-coated parts, µ = 0,06 | M_{1} | = | drive torque | d_{t} | = | reference diameter of sliding profile (see table) | | = | angle between tooth flank and centre point beam (see table) | C | = | profile overlap (tooth engagement length, see table) | Table Profile to DIN 5480 | d_{t}·cos [m] | C_{min }[m] | 38 x 2 52 x 2,5 55 x 2,5 62 x 2 65 x 2,5 75 x 2,5 90 x 2,5 95 x 2 | 0,0310 0,0427 0,0452 0,0503 0,0539 0,0626 0,0758 0,0789 | 0,072 0,100 0,105 0,075 0,125 0,145 0,175 0,085 | This gives the bearing forces: Usually only axial forces are significant. |