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CVT: Chain, Pulleys and Friction Question #4760054
05/17/18 02:18 PM
05/17/18 02:18 PM
Joined: May 2015
Posts: 177
Virginia
GravelRoad Offline OP
GravelRoad  Offline OP
Joined: May 2015
Posts: 177
Virginia
How does the CVT chain (in normal operation) not slip on the smooth pulleys? Metal to metal contact? Is it the fluid that gives it friction? Boundary layer?

Layman terms please grin2


(I have read/watched many articles and videos, still stumped. The variable pulleys use high hydraulic pressure to squeeze the special designed chain.)


2016 Subaru Outback Premium 2.5. PP 5w30 oem filter
2018 Hyundai Kona 1.6T. Lifetime dealer free oil/filter change
Re: CVT: Chain, Pulleys and Friction Question [Re: GravelRoad] #4760063
05/17/18 02:24 PM
05/17/18 02:24 PM
Joined: Aug 2003
Posts: 11,059
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,059
Buffalo, NY
It's my understanding that it's the tension lengthwise and compression width wise on the "belt", as well as the properties of the CVT fluid that aid in preventing slippage. Like most automatics, its the torque converter that should do all the slipping. I dunno of a mainstream automotive CVT that doesn't use a TC aside from units used in some hybrids.

Last edited by JTK; 05/17/18 02:24 PM.

2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: CVT: Chain, Pulleys and Friction Question [Re: GravelRoad] #4760067
05/17/18 02:28 PM
05/17/18 02:28 PM
Joined: Jun 2017
Posts: 655
DFW
JustN89 Offline
JustN89  Offline
Joined: Jun 2017
Posts: 655
DFW
Give this thread a read. It, along with the other thread linked in there, should answer your questions.

Re: CVT: Chain, Pulleys and Friction Question [Re: GravelRoad] #4760250
05/17/18 06:02 PM
05/17/18 06:02 PM
Joined: Aug 2010
Posts: 1,204
pa
benjy Offline
benjy  Offline
Joined: Aug 2010
Posts: 1,204
pa
from reading manufacturers like CVT's because they are cheaper, while the consumer deals with the many failures they have!! no clutch no sale for me, repairs almost cost as much as an engine!!!

Re: CVT: Chain, Pulleys and Friction Question [Re: JustN89] #4760865
05/18/18 09:58 AM
05/18/18 09:58 AM
Joined: May 2015
Posts: 177
Virginia
GravelRoad Offline OP
GravelRoad  Offline OP
Joined: May 2015
Posts: 177
Virginia
Originally Posted By: JustN89
Give this thread a read. It, along with the other thread linked in there, should answer your questions.


Thank You! That link https://www.sciencedirect.com/science/article/pii/S0094114X08001432 helped alot, but the math was over my head.


2016 Subaru Outback Premium 2.5. PP 5w30 oem filter
2018 Hyundai Kona 1.6T. Lifetime dealer free oil/filter change
Re: CVT: Chain, Pulleys and Friction Question [Re: benjy] #4760867
05/18/18 09:58 AM
05/18/18 09:58 AM
Joined: May 2015
Posts: 177
Virginia
GravelRoad Offline OP
GravelRoad  Offline OP
Joined: May 2015
Posts: 177
Virginia
Originally Posted By: benjy
from reading manufacturers like CVT's because they are cheaper, while the consumer deals with the many failures they have!! no clutch no sale for me, repairs almost cost as much as an engine!!!


Not helpful spank


2016 Subaru Outback Premium 2.5. PP 5w30 oem filter
2018 Hyundai Kona 1.6T. Lifetime dealer free oil/filter change
Re: CVT: Chain, Pulleys and Friction Question [Re: benjy] #4761087
05/18/18 12:56 PM
05/18/18 12:56 PM
Joined: Mar 2008
Posts: 7,542
USA
slacktide_bitog Online content
slacktide_bitog  Online Content
Joined: Mar 2008
Posts: 7,542
USA
Originally Posted By: benjy
from reading manufacturers like CVT's because they are cheaper, while the consumer deals with the many failures they have!! no clutch no sale for me, repairs almost cost as much as an engine!!!


Autozone has a sale on Castrol CVT fluid for only $5/qt. Just change the fluid every year or two, and you will usually have no problems smile


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