1. Offline

    cycledrum PSOCSOASP

    Member Since:
    Apr 9, 2008
    Posts:
    7,079
    Likes Received:
    810
    Location:
    NorCal
    Your Vehicle Year:
    2011 Prius
    Model:
    Three
    Get a good look at the 3rd Gen MG1, MG2, clutch plate and power split gears on the bench and explained by an automotive professor. 3rd Gen Prius has motor speed reduction planetary gearset not used in 2nd gen, allowing higher speed for MG2 and 2.5 to 1 torque multiplication for more powerful electric drive and higher EV speed. This design was also used in 2006 HiHy and 2007 CamHy.

    Enjoy!

    Last edited by cycledrum, Feb 3, 2013
  2. Offline

    pichner Metallic Maniac #001

    Member Since:
    Nov 30, 2012
    Posts:
    66
    Likes Received:
    20
    Location:
    Minneapolis, MN
    Your Vehicle Year:
    2012 Prius
    Model:
    Three
    I have watched this bad boy a few times, great info!
  3. Offline

    Britprius Senior Member

    Member Since:
    Jun 14, 2010
    Posts:
    3,887
    Likes Received:
    1,080
    Location:
    Herefordshire England
    Your Vehicle Year:
    2008 Prius
    Model:
    N/A
    Why has the gen3 version flywheel got a ring gear.
  4. Offline

    pichner Metallic Maniac #001

    Member Since:
    Nov 30, 2012
    Posts:
    66
    Likes Received:
    20
    Location:
    Minneapolis, MN
    Your Vehicle Year:
    2012 Prius
    Model:
    Three
    They had to make that crazy speed reduction "thing" to allow the electric motor to operate at higher wheel speeds. At least I think that is what you are asking about.
  5. Offline

    Britprius Senior Member

    Member Since:
    Jun 14, 2010
    Posts:
    3,887
    Likes Received:
    1,080
    Location:
    Herefordshire England
    Your Vehicle Year:
    2008 Prius
    Model:
    N/A
    No. If you look in the beginning the gen2 flywheel that has the torque limiter clutch in the middle has no ring gear obviously because the Prius does not have a normal starter motor. Then look at the gen3 flywheel and it has a normal strait cut ring gear on it (not mentioned in the demonstration).
  6. Offline

    tumbleweed Senior Member

    Member Since:
    Oct 3, 2005
    Posts:
    4,070
    Likes Received:
    647
    Location:
    Eastern Oregon
    Your Vehicle Year:
    2010 Prius
    Model:
    V
    Good question, could it be they use the same flywheel as the non-hybrid vehicles that share that engine?
  7. Offline

    Sabby Member

    Member Since:
    Sep 17, 2011
    Posts:
    225
    Likes Received:
    74
    Location:
    NY
    Your Vehicle Year:
    2011 Prius
    Model:
    Two
    Thanks for sharing. Finally explains how the plug in can hit 61 mph without the gas engine on, compared with 46 mph for the Gen III without overspeed on MG 1.
  8. Offline

    Britprius Senior Member

    Member Since:
    Jun 14, 2010
    Posts:
    3,887
    Likes Received:
    1,080
    Location:
    Herefordshire England
    Your Vehicle Year:
    2008 Prius
    Model:
    N/A
    That was my first thought but that would also apply to the gen2 version. Toyota would not do this however. Just think cost of making and fitting ring gear (heated and shrunk on) say £10-$16 at factory prices, on 1 million cars or more since gen3 start of production = £10,000,000- $16,000,000 they do not through that sort of money away.

    John (Britprius)
  9. Offline

    jadziasman 83K miles to go before the odometer stops

    Member Since:
    Jan 17, 2011
    Posts:
    629
    Likes Received:
    172
    Location:
    District 6
    Your Vehicle Year:
    2005 Prius
    Model:
    Five
    That's just great. Thirty minutes of youtube footage and I'm no longer happy with my Gen II and its antiquated technology. Toyota just had to add a second planetary gear set to the eCVT to transform my Gen II into a Model A. Sigh.

    But thanks much for the vid, cycledrum. I have the Gen II eCVT teardown/demo from the same folks in my video archives.

    Now it's time for me to find a >100K mile Gen III for under $10K. Let the search begin!
  10. Offline

    El Dobro A Member

    Member Since:
    Jul 12, 2011
    Posts:
    3,689
    Likes Received:
    1,054
    Location:
    NJ
    Your Vehicle Year:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    It could just be a flywheel that was lying around the shop and used for the demo.
  11. Offline

    xs650 Senior Member

    Member Since:
    Jul 2, 2010
    Posts:
    4,525
    Likes Received:
    1,372
    Location:
    Northern California
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    Nice observation! For what it's worth, the factory repair manual has several illustration that show the Gen III flywheel in line drawing format. No teeth show in any of them. That's not conclusive because maybe they just didn't feel like drawing the teeth :D . Possibly the flywheel in the picture wasn't from a Prius?
  12. Offline

    cycledrum PSOCSOASP

    Member Since:
    Apr 9, 2008
    Posts:
    7,079
    Likes Received:
    810
    Location:
    NorCal
    Your Vehicle Year:
    2011 Prius
    Model:
    Three
    He mentioned that 3rd Gen transaxle was a P310 from a 2008 Highlander or Lexus RX hybrid. Sounds like 2nd Gen transaxle was only used in Prius.

    Sorry if this video spurs one to sell off their 2nd gen :eek:
    Last edited by cycledrum, Jan 25, 2013
    xs650 likes this.
  13. Offline

    jadziasman 83K miles to go before the odometer stops

    Member Since:
    Jan 17, 2011
    Posts:
    629
    Likes Received:
    172
    Location:
    District 6
    Your Vehicle Year:
    2005 Prius
    Model:
    Five
    I was just being sarcastic, which is difficult for me to express with text and I'm not sure which emoticon works for that.

    I always wondered how the Gen III Prius could achieve better mpg than the Gen II with a larger ICE. Now I know.
  14. Offline

    telmo744 HSD fanatic

    Member Since:
    Apr 8, 2010
    Posts:
    1,051
    Likes Received:
    115
    Location:
    Portugal
    Your Vehicle Year:
    2010 Prius
    Model:
    N/A
    Larger ICE usuallty lowers BSFC, and Toyota confirmed that when launched GenIII. Transaxle improvements are also to be taken in account but may not be as determinant.
  15. Offline

    szgabor Active Member

    Member Since:
    Jul 29, 2009
    Posts:
    757
    Likes Received:
    113
    Location:
    Oceanside NY
    Your Vehicle Year:
    2012 Prius
    Model:
    Two

    not sure if this is my pc or something but the sound is awfull for me many places can not understand the words from the noise ... is this just me ???

    other youtube stuff works though
  16. Offline

    tumbleweed Senior Member

    Member Since:
    Oct 3, 2005
    Posts:
    4,070
    Likes Received:
    647
    Location:
    Eastern Oregon
    Your Vehicle Year:
    2010 Prius
    Model:
    V
    I just tried it again and it looks and sounds OK on my computer. I think it uses Adobe Flash Player, try downloading the latest version.

    YouTube videos won't play? - YouTube Help
  17. Offline

    szgabor Active Member

    Member Since:
    Jul 29, 2009
    Posts:
    757
    Likes Received:
    113
    Location:
    Oceanside NY
    Your Vehicle Year:
    2012 Prius
    Model:
    Two

    Thanks ..

    What solved the problem for me, is to download the video completely and then watch it ... that way it was fine. Not sure why I had problem with streaming.

    And it worth the wait... I had an idea how this works but really seeing the parts "outside" was amazing. It would be even better if the video would show where and how all these sit in the car. Like when it it taken out.
  18. Offline

    Madduck New Member

    Member Since:
    Jun 16, 2013
    Posts:
    22
    Likes Received:
    4
    Location:
    SLC, Utah
    Your Vehicle Year:
    2010 Prius
    Model:
    II
    Does anyone else wonder what this guy looks like? Probably just like my auto shop teacher in high school.
  19. Offline

    Feri Active Member

    Member Since:
    Jun 25, 2011
    Posts:
    617
    Likes Received:
    101
    Location:
    Maldon Victoria Australia
    Your Vehicle Year:
    2010 Prius
    Model:
    III

    I'm no expert but isn't this because Gen II used a chain for power transfer and Gen III uses gear to gear?

    Sorry hadn't seen the video when I wrote above.
    Last edited by Feri, Jul 11, 2013
  20. Offline

    Madduck New Member

    Member Since:
    Jun 16, 2013
    Posts:
    22
    Likes Received:
    4
    Location:
    SLC, Utah
    Your Vehicle Year:
    2010 Prius
    Model:
    II

    This video shows a stylized location of the transaxle in the car. The video is of a Lexus but it is the same design.

Share This Page