21 votes

Ratio zero is the world's first geared CVT and it will blow your mind

Posted by dangeresque
Tags: engineering.mechanical, transport, automotive, cvt, videos, driving 4 answers, source.youtube
https://www.youtube.com/watch?v=mWJHI7UHuys

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Authors
driving 4 answers
Duration
24:10
Published
Dec 1 2024

5 comments

  1. [3]
    dangeresque
    Link
    I'm very interested to see if these make it to market, and how reliable they are compared to belt/chain CVTs. It's sad that it may just as soon be obsolete as EVs are taking off lol

    I'm very interested to see if these make it to market, and how reliable they are compared to belt/chain CVTs. It's sad that it may just as soon be obsolete as EVs are taking off lol

    7 votes
    1. [2]
      stu2b50
      Link Parent
      Planetary CVTs have proven to be pretty reliable by now, if boring/unresponsive to car enthusiasts.

      Planetary CVTs have proven to be pretty reliable by now, if boring/unresponsive to car enthusiasts.

      11 votes
      1. dangeresque
        Link Parent
        I've only heard of planetary CVTs in a hybrid-electric application. Has one ever been used for an ICE-only powertrain?

        I've only heard of planetary CVTs in a hybrid-electric application. Has one ever been used for an ICE-only powertrain?

        1 vote
  2. [2]
    myrrh
    Link
    ...i saw a CVT demonstrated about fifteen years ago which modulated the speed of a planetary control shaft to determine the drive:output gear ratio; not sure what become of the design but it was...

    ...i saw a CVT demonstrated about fifteen years ago which modulated the speed of a planetary control shaft to determine the drive:output gear ratio; not sure what become of the design but it was fully geared...

    6 votes
    1. dangeresque
      Link Parent
      That's basically how Toyota's hybrid powertrain works.

      That's basically how Toyota's hybrid powertrain works.

      1 vote