Uni Wheel

This article is about the in-wheel gear train system. For the one-wheeled vehicle, see monowheel.

The Uni Wheel is a novel wheel design designed by Hyundai and Kia for use in electric vehicles. It incorporates several elements of the drive train into the wheel itself using a system of planetary gears.[1] The name is an abbreviation of Universal Wheel Drive System.[2]

The Uni Wheel is intended to gain the advantages of individual wheel drive without having to mount the motor directly to, or inside, the wheel. Instead, it subsumes the functions of constant-velocity joints, drive shaft and reduction gearing into a single system within the wheel.[1]

The system has a central sun gear, linked by two articulated systems of pinion gears to an enclosing ring gear.[3][4] It provides both gear reduction and decoupling of the rotation axis of the wheel from the rotation axis of the motor, allowing the motor to be mounted rigidly to the chassis, with the axial loads on the wheel being taken entirely by the suspension system, and also allowing the wheel to be driven at higher speed but lower torque by a smaller-diameter drive shaft.[citation needed]

The increased number of gears within the wheel has been identified as a point of concern in relation to possible noise and complexity problems.[5]

References

  1. ^ a b Gitlin, Jonathan M. (2023-12-01). "Hyundai and Kia completely rethink the EV drive unit with Uni Wheel idea". Ars Technica. Retrieved 2023-12-02.
  2. ^ "Hyundai, Kia introduce Uni Wheel electric drive system". Autoblog. Retrieved 2023-12-02.
  3. ^ Doll, Scooter (2023-11-29). "Hyundai and Kia introduce a new 'Uni Wheel' drive system that could revolutionize EV design". Electrek. Retrieved 2023-12-02.
  4. ^ Team, Web (2023-11-30). "Hyundai and Kia unveil 'paradigm-shifting' Uni Wheel drive system". Electric & Hybrid Vehicle Technology International. Retrieved 2023-12-02.
  5. ^ Kierstein, Alex (November 29, 2023). "Hyundai's Weird "Uni Wheel" Is Either a Full-On Revolution or Totally Pointless". Motortrend. Retrieved 2023-12-02.


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