TABLE OF CONTENTS The loading of driveshafts depends both on the prime mover and the machinery which is connected. This is given by the shock or operating factor f ST (Table 4.2).
The objective is a balanced relationship between the maximum transmitted torque M 0 (permanent deformation ? b /d < 1 10 ?4) and the required durability L hx If the life L hx is too short, the speed is increased by altering the gear ratios to reduce the torque M 0. The effect of the change in the speed on the life L hx is linear; the effect of changing the torque is to the third power.
The basic procedure for the applications engineering of a constantly loaded drive shaft is shown in Table 4.22. The decision on whether to use a Hooke's joint or a constant velocity joint, i.e. the permissible non-uniformity, is made with the help of (1.2) in Sect. 1.2.1 (Fig. 1.7).
For variable loading, as in a motor vehicle, the life is calculated with a mean torque M m obtained by transforming (1.22) using P = M/R (Sect. 1.5.3). The individual joints are examined using a mean articulation angle ? m The life is derived from the total fatigue damage 1/ L hx, made up of the damage for each individual gear, see (1.20) and the calculation examples in Sects. 4.4.5 and 4.5.2.3. The...
