big_red_man
Member
Does it matter if these (universal joints) are opposite or the same? (I don't know how to describe opposite/same.) IF it matters one way or another, WHY does it matter?
- Thread starter big_red_man
- Start date
Steve in VA
Well-known Member
- Location
- Natural Bridge Virginia
https://www.youtube.com/watch?v=Idk3BVDVHq4
Nice and concise
Nice and concise
RogerinIowa
Member
What you are concerned about is called "phasing". And yes it matters!
Graham of New Zealand
Member
Sure does matter!! As the shaft rotates the cross does not deliver the turn all at the same speed so gives a kind of a "flick" in the middle of it's rotation giving a moment of a faster rotation. This happens twice every rotation of your driveshaft. If you Phase them they tend to cancel each other out, giving you a smooth operation. That is why they install "constant velocity" joints in automotive front drive axles.
big_red_man
Member
Got it! Thanks! I just had an aha moment. I've noticed new driveshafts are no longer square or triangle. They are rectangular or "odd" triangles. The reason must be to reduce the possibilities of getting them out of phase. Thanks again to all!
Freshman level: Yes it matters. Proper phasing cancels accelerations.
Sophomore level: Aligned yokes will cancel the acceleration as long as the angle of operation of each joint is the same, like the short pto shaft that connects to the tractor.
Junior level: If you have more than 2 joints or the angles are not the same, the acceleration "might not" be canceled. Think two shaft implement pto drives such as a small square baler or long truck.
Senior level: By misaligning the joints "correctly" or adjusting the operating angles "correctly", the accelerations can be canceled. Again, think baler or large truck setups. These may or may not have misalignment on one or both shafts.
Sophomore level: Aligned yokes will cancel the acceleration as long as the angle of operation of each joint is the same, like the short pto shaft that connects to the tractor.
Junior level: If you have more than 2 joints or the angles are not the same, the acceleration "might not" be canceled. Think two shaft implement pto drives such as a small square baler or long truck.
Senior level: By misaligning the joints "correctly" or adjusting the operating angles "correctly", the accelerations can be canceled. Again, think baler or large truck setups. These may or may not have misalignment on one or both shafts.
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