Viewing a thread - Double universal joint shaft alignment
Viewing a thread - Double universal joint shaft alignment
Posted 12/30/ 21:19 (#)
Subject: Double universal joint shaft alignment
Vincennes, INI am in the process of building two more irrigation units. These units have pumps coupled to the engine with a short-coupled double universal joint shaft. I am unsure of the proper alignment/phasing of the universal joints to one another. Should they be lined up the same on each end of the shaft like in the first picture or 90 degrees off like in the second picture? Or does it matter at all as long as they lined up one way or the other? I've searched the net but have come up with conflicting opinions. Thanks.
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NC IApic #1 is correct
south east il+1
#1 is correct.
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Also I've been told (by people that I trust to know what they are talking about ) that the ends should not straight across from each other.
They should be straight with each other but one should either be higher/lower or shifted to the side a little bit.
top pic!Manitoba, Canada+2
just a tish NE of central NDGo with the first example. its sort of hard to explain why, but If you go the other way they will vibrate if they aren't about perfectly straight in line (stub shafts )Due to the fact that as the angle of the cross changes on one end as the drive line shaft stub angle is taken from a straight position and , the angle on the other cross is in the wrong position to correctly compensate the offset of the first cross angle. so it will have a fast slow, fast slow action (clear as mud? )
Southwest MichiganStraight in line With the engine a little higher or lower to ensure that the bearings in the crosses move a little. or they may siez after a few years if thier is no movement
southern ohioI have always been told to never have the shaft in perfect alignment. it will not turn the bearings in the u-joints and cause problems. it doesn't matter if its off left-right or up-down as long as its not a extreme angle.
Crawfordsville, Arkansasbtaylor - 12/30/ 21:06
I have always been told to never have the shaft in perfect alignment. it will not turn the bearings in the u-joints and cause problems. it doesn't matter if its off left-right or up-down as long as its not a extreme angle.
Correct. Never have them perfectly straight or the rollers in the joints will wear flat and you will be walking across your field looking for that half of the shaft. Keep it greased well and it will last.
NE Iowaand none to soon, only one day left. I'm going to have to check a few driveshafts and JD mow-co PTO. Here is a site with a bit of explaination.
www.roll-kraft.com
Edited by FarmerFrank 12/30/ 22:49
Leeds, North DakotaMatt # 1 is correct, nice work, do have a couple questions, are shafts in alignment, and why not slide collar in more so shaft flexs a bit, Scott.G. DAY
Posted 12/31/ 11:53 (# - in reply to #)
Subject: RE: Double universal joint shaft alignment
Universal Joint Phasing
The Concept and Importance of Universal Joint Phasing and Drive Shaft Alignment
Phasing is the process of aligning the universal joint yokes on both ends of the drive shaft (or double u-joint) in a parallel fashion. If the joints are not properly phased, they will operate at varying speeds throughout each revolution which can cause second-order vibrations. U joint vibrations can lead to increased wear and potential damage to the assembly and failure of the application.
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U Joint Phasing & Alignment Diagram
Belden Universal's trained technicians properly phase the universal joints onto the shaft during assembly, ensuring that the inbound vs outbound shaft of the universal joint assembly operate at near-constant velocity, minimizing vibration, noise, and premature wear of the joints. Refer to the u joint diagram below.
To further support near-constant velocity, driving and driven shafts are required to be aligned in either the &#;W&#; formation (equal true angles) or &#;Z&#; formation (parallel). It is important that the drive shaft is not angled further in a '3rd dimension'. &#; In addition to diminished velocity and reduced efficiency, improper shaft alignment contributes to the failure of the shaft components and even the application itself.
A word of caution: even though driving and driven shafts are now at a constant velocity, this is not true for the center section &#; that still fluctuates which can cause problems at elevated speeds of @ RPM.
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