Planetary EV Drive Layout for Compact Torque Distribution
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Solution Overview
Problem
Conventional vehicular drive devices face issues such as inefficient energy transfer, mechanical complexity, and stability problems due to poor design, leading to reduced fuel efficiency, increased size, weight, and instability, especially in electric vehicles with high rotational speeds and varying road conditions.
Innovation Solution
A drive device with a compact design featuring adjacent planetary gear mechanisms, deceleration mechanisms, and a differential mechanism that reduces the size and weight of the drive system while enhancing stability through torque vectoring, utilizing a control motor for efficient drive force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional diff mechanism with differential gears and pinions is used, then rotational torque can be transmitted to wheels, but energy transfer efficiency deteriorates and fuel efficiency is reduced
Solution Approach 1:
The patent replaces the conventional mechanical differential mechanism with an electromagnetic coupling system consisting of a primary yoke, secondary yoke, and electromagnetic coils. This substitution eliminates mechanical gear meshing losses and achieves torque distribution through magnetic fields, significantly improving energy transfer efficiency and fuel economy
2Adaptability or versatility
If conventional diff mechanism structure is used, then torque distribution is achieved, but device complexity increases and size enlarges
Solution Approach 1:
The patent merges the differential function and torque distribution capability into a single integrated electromagnetic coupling device. The primary and secondary yokes are coupled through electromagnetic interaction, combining multiple functions (torque transmission, differential action, and distribution control) into one compact unit, thereby reducing overall device complexity
Solution Approach 2:
The electromagnetic coupling device serves multiple functions simultaneously: it transmits rotational torque, provides differential action for wheel speed variation, and distributes torque to left and right wheels. This multi-functionality eliminates the need for separate mechanical components, simplifying the overall system
3Speed
If conventional diff mechanism is used, then wheel rotation is enabled, but stability deteriorates due to poor design
Solution Approach 1:
The patent incorporates a control unit that receives signals from sensors detecting wheel speed and vehicle state, then adjusts the current supplied to electromagnetic coils in real-time. This feedback control ensures stable torque distribution and maintains vehicle stability during various driving conditions including high-speed rotation and differential operation
Solution Approach 2:
The electromagnetic coupling system dynamically adjusts torque distribution based on real-time vehicle conditions. The control unit varies the electromagnetic field strength by adjusting coil current, enabling adaptive torque allocation that maintains stability during acceleration, deceleration, and turning maneuvers
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves vehicle stability and reduces size and weight, enhances durability, and provides efficient torque distribution, making it suitable for electric vehicles, especially on rough roads and during high-speed driving.
Implementation Method 1
a plurality of planetary gears 24 and 25 that mesh with the external sun gears 22 and 23, and rotate around the external sun gears while revolving
Implementation Method 2
a differential mechanism that rotates the ring gears in mutually opposite directions
Implementation Method 3
a control motor 72 that generates an electromagnetic force
Data Source
AI summary
In a drive device, it is possible to reduce the size of a planetary gear mechanism, reduce the size and weight of the entire drive device, reduce the dimension between the tip ends of an output shaft for outputting rotational torque, the tip ends protruding in directions opposite to each other, and improve vehicle stability. External sun gears are coupled to an input shaft. Planetary carriers are coaxial with the input shaft, are adjacent to planetary gears in the axial direction thereof, and have external gears that rotate together with the planetary carriers. Ring gears respectively meshing with the planetary carriers are rotatably supported and rotate in mutually opposite directions by means of a differential mechanism. Intermediate gears and input-side gears are respectively fixed to intermediate shafts, the intermediate gears respectively meshing with the external gears. Output gears respectively meshing with the input-side gears are respectively fixed to output shafts.