 # Ball joint universal coupling      The ball joint type universal coupling is to select the appropriate ball joint type universal coupling according to the speed, power and torque.      Reference for selection of ball joint type universal coupling: According to the speed, power and torque, select the appropriate ball joint type universal coupling, when the direction of rotation is not changed, the angle α=10°, the uniform load is transmitted, and the operation is for 1h The single ball joint universal coupling is used, and the transmission capacity of the double ball joint universal coupling is slightly lower than that of the single ball joint universal coupling. In other corners, the relevant marked coefficients are used for calculation.      For example 1: Known: power Pw=3310W, speed N=200r/min, angle α=10° Find the intersection point P of 3310W horizontal line and 200r/min vertical line in the relevant chart, then choose WJ10 coupling. When the angle α=20°, it can be drawn from the relevant figure that the WJ10 coupling transmits 3310W*0.75=2483W at 200r/min. Therefore, if the WJ10 coupling is too small, the WJ12 coupling should be selected and the transmission should be 4781W. *0.75=3856W.      For example 2: Known: rotation speed n=200r/min, torque T=157N.m; included angle α=10° Find the vertical line of 200r/min in the relevant atlas parameters, the intersection with the diagonal line of 157N.m is P , Then choose WJ10 coupling. For example 3: Known: speed N=200r/min, torque T=177 (N.m); angle α=20°. In order to be able to use the relevant atlas parameters, the included angle should be converted to 10°, so the torque value is divided by the coefficient of 20°, 177/0.75=236N.m, from the vertical line of 200r/min and the diagonal line of 236N.m The intersection point is determined, WJ12 coupling should be selected    ﻿