Talk:Universal joint
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Something is wrong with the velocity-formula. The average velocity of one rotation should be equal to the driven velocity which is clearly not the case.
- I inserted the missing 'squared' (as in the reference I added under ==References==). --Heron 19:22, 23 August 2005 (UTC)
The angular acceleration equation is not correct...the entire denominator must be squared to be correct. lstike 2/13/06
- Right! Corrected. MH 20:44, 29 August 2006 (UTC)
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[edit] Merge Gear coupling to Universal Joint?
I would disagree with this proposed merger. While the two devices may serve similar roles and their articles certainly should be inter-linked, they are mechanically very different and I believe the current separate write-ups are entirely justified.
Atlant 5 July 2005 11:43 (UTC)
- Likewise. There are another dozen types of flexible couplings as well. They won't all fit here once they are done. Meggar 05:34, 30 October 2005 (UTC)
[edit] CV joints
There is already a write-up on Constant-velocity joints. Wouldn't be better to remove the section in here and link to the other write-up? Soupisgoodfood 11:11, 3 November 2005 (UTC)
[edit] NPOV name
It seems arbitrary to call this device "the Spicer joint" when it is well known that Girolamo Cardano invented the universal joint centuries earlier. In fact, there are even accounts of the use of such a device in the ballistae of ancient times. I checked the history of this article and it seems that it originally listed various names for the device, before a vandal clumsily chopped off part of the text: compare with the previous revision. The last few edits failed to notice that the article had been vandalized, patching up the mutilated sentence for grammar correctness alone. The article has now been fixed. 23:04, 15 May 2006 (UTC) —The preceding unsigned comment was added by 82.55.247.187 (talk • contribs) .
- Thanks!
- Atlant 15:38, 16 May 2006 (UTC)
[edit] Speed ratio?
What is the speed ratio of the input shaft to the output shaft? —The preceding unsigned comment was added by 156.63.207.123 (talk • contribs) .
- On average, 1:1. But if the two shafts are not co-linear (aligned with each other), then the speed ratio varies throughout a half-revolution of the shafts. The article has the formula.
- Atlant 16:31, 25 May 2006 (UTC)
Note that I wrote "Over large time intervals". When driving shaft turns a hundred times, driven shaft will turn a hundred times. When driving shaft makes 100 rotations in one minute, driven shaft too will make 100 rotations in that minute. Of course, when driving shaft rotates for 90 degrees, driven shaft will rotate for less, or more. Speeds of the shafts are the same, in the same sense as speed of a car which passes 100Km going 100Km/h is the same as speed of car which goes 200Km/h but stopps for an hour in the middle of the trip are the same.
As apparently 156.63 found it confusing, and I too was thinking for a moment "wait, if speeds are not the same then where did angular momentum go?", I believe that what I wrote should be in the article in some way. Perhaps it could be said that average speed is the same.
If you wish to nitpick note that, in the same sense of the word, speeds of gears with 1:1 ratio are not the same because the driven gear jerks a bit too, though it's far less visible than with universal joint ;) Nikola 23:19, 24 January 2007 (UTC)
[edit] Thompson Coupling - a new constant velocity universal joint
No discussion on universal joints is complete without mentioning the Thompson Coupling, a true constant velocity universal joint which can withstand an axial force such as the force applied by a rotating helicopter prop. Reference: cvcoupling.com - Simon Purser
