Posted by Janicholson on June 16, 2020 at 08:25:50 from (24.240.46.228):
In Reply to: Re: Mini rant posted by Grandpa love on June 16, 2020 at 05:44:08:
PTO universal joints must be in "phase" or "timed" the action of a single Ujoint is complex, it provides perfect one to one rotating motion only when it is absolutely straight from input to output. All other times the input shaft is turning at a constant speed (rotationally) but the output shaft changes speed accelerating and decelerating twice per revolution. I am sure you have found this to be the case when using a Ujoint socket adapter, some spots on a revolution are easy, while others are hard and try to tip the socket off the nut. This change in velocity is increased every time the angle of the joint increases. To diminish this, a second Ujoint is used in the drive shaft (cars and trucks included) that reverses the lost rotation exactly as the middle shaft is increased, the second (final) output shaft is decreased. This neutralization of rotational variation is accomplished by having the input yoke, aligned with the output yolk. Also the middle shaft has its yokes aligned as well. The illustration depicts this issue. The U joints should be angled the same on each wnd when turning so the equilization is uniform, but not always possible. The phasing is effected when even one spline is not where it belongs by one spline. Especially in vehicles that can have 3 thousand RPM speeds. Jim
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