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Implement Alley Discussion Forum

Re: pto shaft question

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Author  [Modern View]

10-21-2012 03:54:39

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A u-joint essentially has a "gear ratio" that follows a sine wave pattern when running at an angle. In other words, the output speed goes up and down relative to the input speed. An "equal angle" driveline always has two u-joints that run at the same angle and are in phase with each other. This results in the speed ratios canceling themselves out and the output speed then equals the input speed of the system. (A CV joint works exactly the same way except it two u-joints bundled into a single package.) However, if your driveline has only one u-joint that bends when you turn the input speed going into the implement is pulsing up and down. This is what causes the chatter.

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Nebraska Cowman

10-21-2012 09:52:53

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 Re: pto shaft question in reply to Brendon-KS, 10-21-2012 03:54:39  
Which in simple terms a layman can understand the pivot point (hitch pin) needs to be centered between the two joints, correct?

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10-21-2012 10:05:31

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 Re: pto shaft question in reply to Nebraska Cowman, 10-21-2012 09:52:53  
You're right. If your hitch pin is centered between two u-joints then you should be able to have a chatter-free system. If you have one u-joint right at the tractor and one way back on the implement then you can expect vibration during turns.

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