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Automakers hope to save millions of dollars with joint development

Ford and General Motors have announced that they have teamed up to jointly develop a new generation of advanced 9- and 10-speed transmissions that will be used in cars, crossovers, SUVs, and trucks.
The automakers say that the new transmissions will increase both performance and fuel economy. Engineering and development work for the transmissions is currently underway.

“Engineering teams from GM and Ford have already started initial design work on these new transmissions,” said Jim Lanzon, GM vice president of global transmission engineering. “We expect these new transmissions to raise the standard of technology, performance and quality for our customers while helping drive fuel economy improvements into both companies' future product portfolios.”

Automakers need every edge they can get to meet the looming federal CAFE guidelines set to go into effect over the next several years. With a greater number of gear ratios available in the transmission, the engine can operate at more efficient RPMs, which in turn leads to improved fuel economy.
Some industry analysts believe that a nine-speed automatic transmission could increase fuel economy by five to ten percent compared to the same vehicle using a six-speed transmission.
The two companies have collaborated on transmission technology in the past. Ford and GM previously collaborated to build a six-speed transmission for front-wheel drive cars. Ford currently uses the six-speed transmission and vehicle such as the Fusion and Edge. GM uses the transmission in the Malibu and Cruze among others.
Chrysler is currently using an eight-speed automatic transmission in some of its automobiles, including its popular line of trucks.

Source: GM

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RE: Continuously Variable Transmission (CVT)
By HammerFan on 4/15/2013 10:20:21 AM , Rating: 2
As FITCamaro alluded to, there is not yet a CVT that can handle high torque loads (>300ft.lbs) and to build one that could would probably not be any better than a multi-planetary box in terms of fuel savings or acceleration performance.

By km9v on 4/15/2013 10:30:19 AM , Rating: 3
Gears are stronger than belts.

By fleshconsumed on 4/15/2013 10:47:42 AM , Rating: 2
Maybe not for trucks, but CVTs are perfectly fine for regular 4 door sedans. Nissan has been pairing CVTs with V6 engines for years now, and Subaru is putting CVT into 2014 Forester XT that puts out 258lb-ft. Obviously the CVT is still not beefy enough for trucks and high performance V8 cars, but it serves mainstream market very well.

RE: Continuously Variable Transmission (CVT)
By yomamafor1 on 4/15/2013 12:58:34 PM , Rating: 2
That's false. Case IH Magnum series tractors are equipped with CVTs. I'm pretty damn sure tractors have higher load than regular trucks.

I think the only issue right now is weight and size of the CVT.

RE: Continuously Variable Transmission (CVT)
By djc208 on 4/15/2013 1:45:43 PM , Rating: 2
Is it actually a CVT or are the wheels hydraulicaly driven like on lots of heavy equipment? Then it's just regulating pressure and flow, which is easy.

RE: Continuously Variable Transmission (CVT)
By Spuke on 4/15/2013 2:16:57 PM , Rating: 2
RE: Continuously Variable Transmission (CVT)
By anoldnewb on 4/15/2013 7:26:52 PM , Rating: 2
this tractor transmission is a combo mechanical/hydrostatic - totally different than CVT in cars. The maximum engine power is 195 PTO HP. Not super high, but it can deliver it 7days x 24hrs.

By alpha754293 on 4/19/2013 2:58:05 PM , Rating: 2
DISCLAIMER: I am speaking for myself and not my employer.

Re: Case IH CVT
note - I have NOT been able to find ANY statistics on the torque carrying capacity for said CVT and I've also NOT been able to find the duty cycle loading limit graph for said CVT.

Those are two SUPER important parameters.

It's so easy to design/engineer the CVT chain/belt to take like 1000 N.m. Your limiting factor would probably be the link pins. And you can design that to only take 1000 cycles. But to design one that costs a few hundred dollars per part (max. to a few dollars), with very tight packaging constraints, using widely available materials, that can take 1e9 cycles - THAT's why it doesn't exist. It's not that it CAN'T be done, but there are a LOT of constraints that are placed on top of the engineering problem that affect it.

And if I remember correctly, the Case IH Magnum tractors were like $150,000-300,000. I'm pretty sure if Pagani or Porsche came up with a $1,000,000 car that has a CVT in it that can handle like 1500 N.m - there'd be people out there asking "WHYYY???" and complain about how pointless or trivial such a car would be.

And 195 PTO HP is nothing if doing like 5000 rpm. But 195 PTO HP is a LOT at 1000 rpm.

"Young lady, in this house we obey the laws of thermodynamics!" -- Homer Simpson

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