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| The difference?; CV and UJ. | |
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| Tweet Topic Started: Sun Feb 20, 2011 7:05 pm (1,012 Views) | |
| Mike wantza Merc | Sun Feb 20, 2011 7:05 pm Post #1 |
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Autophile
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Errm, dumb question alert... I know what they stand for, CV and UJ, but I was under the impression that CV's were found on front wheel drive vehicles, whilst UJ's were on rear wheel drive vehicles... Can someone put me right please? Thanks, in antici.....pation! edited for poor spelling! Edited by Mike wantza Merc, Sun Feb 20, 2011 10:25 pm.
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| shrekky | Sun Feb 20, 2011 7:28 pm Post #2 |
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Troll hunter
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UJ's are normally found on propshafts (in the centre) or a steering column, its a + that fits between 2 halves of a shaft, the + is kept in place by pin bearings. a CV joint , is joint at the end of a shaft, with ball bearings in ,....................see diagrams A cv joint will be found at the end of any driveshaft, front or rear wheel drive ![]() UNIVERSAL JOINT (UJ) ![]() CONSTANT VELOCITY JOINT (CV JOINT) ![]() and i could stand to be corrected but i think some of the older 4x4's like mk1 landrovers did use uj's on the driveshafts Edited by shrekky, Sun Feb 20, 2011 7:35 pm.
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| kentronix | Sun Feb 20, 2011 7:59 pm Post #3 |
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I'm only really here for the Kitchens
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not a dumb question at all, whats the operational difference ? When would you chose one of the other and why ? |
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| algord83 | Sun Feb 20, 2011 8:52 pm Post #4 |
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I can count to potato
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Well A UJ is simple, cheap and very strong, but they don't transmit the force very smoothly, especially when they are being asked to move a lot in different planes (like a FWD car). They are good for transmiting torque when the joint will stay in one plane (or nearly) and doesn't really turn that fast (like a truck prop shaft). CV's are smooth. Thats because they don't change the speed at the other side of the joint (hense constant velocity). If you where to plot the rotational speed of the gubbins inside a UJ on a graph. you would draw a wavey line that would get more pronounced as the angle increased. CV's dont do that, but they are more expensive, break more often as there is a lot of moving gubbins, and they cannot take a load in the direction of the shafts (you cant pull on them). However, as I said. They are great for FWD drive shafts. Incedentally, very early minis had UJ's on there drive shafts. If you put a load of power through them the handling goes propper wierd! More nonsence from Al
Edited by algord83, Sun Feb 20, 2011 8:58 pm.
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| kentronix | Sun Feb 20, 2011 9:27 pm Post #5 |
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I'm only really here for the Kitchens
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excellent explanation mate, cheers. |
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| Mike wantza Merc | Sun Feb 20, 2011 10:28 pm Post #6 |
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Autophile
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Yes, thanks guys, I can see where I was confused. Many thanks. |
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