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https://www.youtube.com/watch?v=dqM3YXEf1js

Good video showing the internal parts.
The Gen 1 is really a very clever design.
Couple of things I really like:
Use of 2 electric motors
Use of "Clutch packs" for engaging or stopping rotating parts vs one way clutches on Fords.
Plus geared final drive vs Second generation Volts chain = early Prius, While latest Prius went to geared.

Cheers,
Martin:D
 

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I watched that video a couple of months ago. Fascinating stuff. I always wondered how the Volt's "transmission" worked. I love watching the videos that show the inner workings of the Volt.
 

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Yeah, saw this a while back. Makes it very easy to picture just how simple it is and how it works (though he did have a couple mistakes in there, IIRC)

Interested to see if he gets his hands on a 5ET50 to see how different it is by adding in the direct drive mode.
 

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The video is a bit confusing as Professor Kelly's description of the 4th operating mode is correct but he incorrectly calls it Mountain Mode. He acknowledges this mistake in the comments section.

It is interesting that a professional who teaches automotive transmissions chose a Chevy Volt for his own car. In the comments section he says the 4ET50 is far superior to other hybrids. By the way, the comments are good reading, they contain a lot of interesting details. Most unusual is Prof. Kelly takes the time to politely respond to all of the comments.
 

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I am subscribed to that channel (Weber Auto). On another video, he stats that most hybrid transaxles (FWD only) use the same structures and have similar operations. He then compared the history of the Prius, and how the three generations of the Aisin units work, then how Ford used the Aisin unit for the Escape and the Gen 1 Fusion hybrids. Now Ford uses its own designed HF35 for the Gen 2 Fusion, C-Max and the Lincoln MKZ hybrids, but it still follows the Aisin structures.

The Ford Hybrid and Energi vehicles all use the same HF35 transaxles and 2.0 L gas engines. The main differences are the battery size and chemistry, the charge port, the on-board AC/DC converter, and programming.
 

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The Volt transmissions are true Engineering miracles.
I find this description a bit long and confusing. And it is not entirely correct either. In the second EV mode both electric motors are running in parallel, each on one end of the planetary gear. The reason for this is to reduce the RPM of MGB at higher speeds, and with that improve efficiency. Kelly's description assumes that only the smaller MGA is running at low power, which is incorrect.


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