The shaft depicted in Fig. 11–18a carries a helical gear with a tangential force of 3980 N,a radial force of 1770 N, and a thrust force of 1690 N at the pitch cylinder with directions shown. The pitch diameter of the gear is 200 mm. The shaft runs at a speed of 800 rev/min, and the span (effective spread) between the direct-mount bearings is 150 mm. The design life is to be 5000 h and an application factor of 1 is appropriate.If the reliability of the bearing set is to be 0.99, select suitable single-row taperedroller Timken bearings.