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  #21  
Old 07-15-2013, 12:59 AM
wolfman01 wolfman01 is offline
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CVT's by design would not be able to handle the strain. The SMOOTH metal belt rides on a pair of SMOOTH variable diameter pulleys. The big challenge with a CVT is preventing slipping between the belt and pulleys. The more power you want to put through a CVT, the higher the clamping forces must be. This has the side effect of reducing efficiency. Last I remember reading in regards to the CVT in use behind Nissan's V6 engines, is that clamping forces are to the tune of 600 to 700 PSI.

CVTs are also very poor transmitters of torque - something that you don't want to lose when pulling trailers and trying to get moving on grades.

As for the size of the transmission housing, it would be no worse than a transfer case.

If you want to have a "CVT" type of driving experience, look for a rare as hen's teeth Silverado Hybrid. The 2-mode system in that truck has a planetary power split device that behaves like a CVT transmission.

Dodge was going to have their version at one time for the Ram, but it got shelved when the company was nearly destroyed.
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  #22  
Old 07-15-2013, 11:12 AM
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a CVT trans looks very similar to a gas powered golf cart drive train. except of having a runner belt it uses a steel one instead.

I have been told the new '13 Nissan CVT uses a chain now instead of the belt design. still now sure on longevity of the trans.
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  #23  
Old 07-23-2013, 07:34 PM
kxlexus kxlexus is offline
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CVT transmissions absolutely can be designed to handle the load of a pick up truck. Some high horsepower farm tractors are now using them. If they can handle the pulling power of a farm tractor, a 1/2 ton truck is nothing
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  #24  
Old 07-23-2013, 10:25 PM
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Quote:
Originally Posted by kxlexus View Post
CVT transmissions absolutely can be designed to handle the load of a pick up truck. Some high horsepower farm tractors are now using them. If they can handle the pulling power of a farm tractor, a 1/2 ton truck is nothing
While it is true that tractors do have a CVT, they also top out at 15-25mph and the load on a tractor is relatively steady ie: fewer shock loads.

A truck goes 75+, stops on a dime, gets stuck in stop and go traffic, hauls 10k pounds, hauls nothing but the driver, rides like a cadillac but accelerates like a 'vette, and the variables for the loads and strains on a truck are nearly infinite.
A tractor is designed to push/pull for long periods, not designed for comfort nor driveability...

Two entirely different machines IMO
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  #25  
Old 07-23-2013, 10:40 PM
kxlexus kxlexus is offline
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Quote:
Originally Posted by DRX350 View Post
While it is true that tractors do have a CVT, they also top out at 15-25mph and the load on a tractor is relatively steady ie: fewer shock loads.

A truck goes 75+, stops on a dime, gets stuck in stop and go traffic, hauls 10k pounds, hauls nothing but the driver, rides like a cadillac but accelerates like a 'vette, and the variables for the loads and strains on a truck are nearly infinite.
A tractor is designed to push/pull for long periods, not designed for comfort nor driveability...

Two entirely different machines IMO
No doubt they are totally different machines. I never said they were the same. The question was if a CVT could be built strong enough for a pickup. Believe me a pickup transmission wouldn't last long in a farm tractor! So the answer is yes, a CVT could be built strong enough for a pickup. The CVT's in use in tractors are many times stronger than what would be necessary for a pickup.
Am I a fan of the CVT? Not at all. Just trying to set the record straight
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  #26  
Old 07-24-2013, 12:06 AM
huntergreen huntergreen is offline
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so a cvt could be designed to versatile enough for all the different uses and conditions a p/u truck is used for.
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  #27  
Old 07-24-2013, 12:26 AM
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Quote:
Originally Posted by huntergreen View Post
so a cvt could be designed to versatile enough for all the different uses and conditions a p/u truck is used for.
I don't think so, but with technology today, anything is possible.

Maybe through different band tensions through throttle position to achieve different engagement properties and behaviors, but who knows...

...IMO, it's prolly a lot cheaper to make 4,5,6,8 speed autos for a high volume item like a truck.
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  #28  
Old 07-24-2013, 12:29 AM
huntergreen huntergreen is offline
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agree with adding gears but i am not an engineer.
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  #29  
Old 07-24-2013, 09:03 AM
kxlexus kxlexus is offline
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The ZF 8speed hooked to my Hemi is so nice, there is no need for any other transmission.
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  #30  
Old 07-25-2013, 07:47 PM
huntergreen huntergreen is offline
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thought trans engineer would jump in here. is he still around?
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