Joint and Cardan Shafts

180 181 Application Guidelines Calculation data Technical Annex Technical Annex  Service Phone Europe  + 49 (0) 71 42 / 353-0  Service Phone North America  + 1 – 2 6 9 / 6 3 7 7 9 9 9  Catalog  Spare parts  Drive-Shaft Calculation  Installation and Maintenance  www.elbe-group.com Under torque, different force conditions exist at the joint spider pins and center piece with the double joint in an angled position than in a straight position. The reason for this is that the torque to be transmitted is not distributed evenly over the joint spider pins any longer. Also, as mentioned in Chapter 5, an additional moment occurs. This additional moment must be combined with the torque to be transmit- ted. This resulting moment leads to higher comp- ression loads and to a larger bending stress within the joint spider pins. The diagram be- low allows to take these factors into account. It shows the percentage the maximum allo- wable torque must be reduced in relation to the deflection angle. 7.5 Torque capacity of double joints as a function of deflection angle Max. allowable torque [%] Deflection angle ß [  ] 8. Hints for the application of pin and block cardan joints, ball and socket cardan joints Torque calculation for needle bearing equipped precision cardan shafts, pin and block cardan joints, ball and socket cardan joints, single The values Md max listed in the diagram repre- sent limit values that may not be exceeded. They are admissible to the full extent only at small rotation speed and minor angle of de- flection respectively during intermittent ope- ration. The transmissible torque varies depending on the size of the angle of deflection. Needle bearing equipped precision cardan joints Permitted max. operation moments of the needle bearing equipped precision cardan joints (Torque in Nm).. Pin and Block cardan joint, Ball and socket cardan joint, single The empirical formula on the right can be used for the rolled calculation of the required joint size. Recommendations for maintenance An adequate lubrication shall be ensured for universal and ball-and-socket joints in per- manent operation. Where drip oiling is not feasible, the joints have to be once daily lubri- cated (for lubricating points see arrow). Joints may also be enveloped in bellows; such bel- lows for these tow joint types may be ordered from us. For utilization of cardan shafts under extreme climatical conditions (high and low temperatures) consult us first. Speed (r.p.m.) Joint type 250 500 1000 2000 3000 4000 5000 0.616 11 10 8 6 5,5 5,1 4,8 0.620 28 25 19 15 14 12,5 12 0.625 35 30 25 20 18,5 17 16 0.632 70 60 50 40 37 34 32 0.640 150 130 100 80 74 68 64 0.650 220 190 150 120 110 100 95 0.663 450 400 310 250 220 200 190 Torque fac tor Angle of deflection ß ° 1 0,75 0,5 0,25 0 0 10 20 30 40 At Md max Speed x bending angle  500 At 0,5 x Md max Speed x bending angle  5000 Lubricating points Lubricating points