window.googletag = window.googletag || {cmd: []}; googletag.cmd = googletag.cmd || []; googletag.cmd.push(function() { googletag.defineSlot('/22557728108/my_article_breadcrumb_above_pc', [ 728, 90 ], 'div-gpt-ad-1685524554756-0').addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.pubads().collapseEmptyDivs(); googletag.enableServices(); });
googletag.cmd.push(function() { googletag.display('div-gpt-ad-1685524554756-0'); });

Hyundai and Kia introduce groundbreaking Uni Wheel - It's an entire EV gearbox housed within a wheel

Arvind · Nov 30, 2023 11:30 AM

Hyundai and Kia introduce groundbreaking Uni Wheel - It's an entire EV gearbox housed within a wheel 01

Hyundai Motor and sister-company Kia have introduced a groundbreaking innovation for EVs. Dubbed the Universal Wheel Drive System, or ‘Uni Wheel’, the system promises to transform the design of future EVs due its novel approach to EV drive systems.

The Uni Wheel is an integrated wheel drive system that essentially relocates the key drivetrain components such as the driveshafts, CV joints, transmission and differential/reduction gears within the wheel hub itself, thus freeing up space between the wheels both at the front and rear.

window.googletag = window.googletag || {cmd: []}; googletag.cmd = googletag.cmd || []; googletag.cmd.push(function() { googletag.defineSlot('/22557728108/my_article_fourthp_under_pc', [ 728, 90 ], 'div-gpt-ad-1685525140735-0').addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.pubads().collapseEmptyDivs(); googletag.enableServices(); });
googletag.cmd.push(function() { googletag.display('div-gpt-ad-1685525140735-0'); });

Additionally, by replacing the large drive motor with four-smaller motors that sit closer to the wheels, the Uni Wheels creates a flat-floor configuration, freeing up substantial interior space.

This design innovation allows for the development of what the company calls Purpose Built Vehicles (PBVs) and other mobility products optimized for various applications.

Also read: Hyundai-Kia files trademark for Hypercasting - Korea alternative to Tesla's Gigacasting

Hyundai and Kia introduce groundbreaking Uni Wheel - It's an entire EV gearbox housed within a wheel 01

The Uni Wheel incorporates a special planetary gear configuration that enables multi-axis movement. This unique design, featuring a sun gear, pinion gears, and a ring gear, allows for a wide range of suspension articulation.

Power generated by the motor is transmitted to the sun gear, which in turn engages the pinion gears to rotate the ring gear that is connected to the wheels itself.

An innovation in itself, is the pinion gear assembly, which are connected to each other to form two linkages, and this multi-link mechanism enables Uni Wheel’s multi-axis movement to allow a wide range of suspension articulation.

Hyundai and Kia introduce groundbreaking Uni Wheel - It's an entire EV gearbox housed within a wheel 02

Besides being compact the Uni Wheel is claimed to deliver greater gear ratio reduction, which in turn improves torque. With independent control of up to four efficient electric drive motors, the Uni Wheel also allows for sophisticated torque vectoring, which enhances stability and overall driving performance, depending on the vehicle application.

The Uni Wheel optimizes battery packaging, minimizing the impact on passenger space. Traditional EVs often sacrifice passenger room due to the low placement of batteries, resulting in a raised ride height. Uni Wheel's flat-floor platform addresses this issue, enhancing passenger space, a valuable feature for PBVs seeking a low, flat-floor design.

This flexibility provided by Uni Wheel allows for the creation of new seating arrangements and designs, particularly relevant in the era of fully autonomous driving.

Also read: Review: Hyundai Ioniq 6 Max AWD - There is a price for beauty, but is it too much?

Hyundai and Kia introduce groundbreaking Uni Wheel - It's an entire EV gearbox housed within a wheel 03

Also given its scalability, the Uni Wheel accommodates wheel sizes ranging from 4 inches to 25 inches, meaning it can be adapted for normal vehicles to mobility devices like wheelchairs, bicycles, and even delivery robots.

Hyundai Motor and Kia are actively testing and refining Uni Wheel to ensure stability, efficiency, and durability. The companies have applied for and registered eight patents related to Uni Wheel in South Korea, the United States, and Europe, emphasizing their commitment to advancing this innovative technology.

Arvind

Senior Writer

Arvind can't remember a time when he didn't wheel around a HotWheels car. This love evolved into an interest in Tamiya and RC cars and finally the real deal 1:1 scale stuff. Passion finally lead to formal training in Mechanical Engineering. Instead of the bigger picture, he obsesses with the final drive ratio and spring rates of cars and spends the weekends wondering why a Perodua Myvi is so fast.

window.googletag = window.googletag || {cmd: []}; googletag.cmd = googletag.cmd || []; googletag.cmd.push(function() { googletag.defineSlot('/22557728108/my_article_relatedmodel_above_pc', [ 728, 90 ], 'div-gpt-ad-1685525247138-0').addService(googletag.pubads()); googletag.pubads().enableSingleRequest(); googletag.pubads().collapseEmptyDivs(); googletag.enableServices(); });
googletag.cmd.push(function() { googletag.display('div-gpt-ad-1685525247138-0'); });
window._taboola = window._taboola || []; _taboola.push({ mode: 'thumbnails-a-2x2-stream', container: 'taboola-below-article-thumbnails', placement: 'Below Article Thumbnails', target_type: 'mix' });

Get a deal on your trade in within 24 hours!

2023 Toyota Yaris 1.5E

Upgrade

Add your car

Not trading-in?   Sell your car