Nested In-Wheel Motor Layout to Avoid Chassis Interference
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Solution Overview
Problem
Conventional in-wheel motor units interfere with chassis parts due to protrusions, limiting design freedom and requiring a solution to integrate motor components without interference.
Innovation Solution
The in-wheel motor unit design incorporates a motor part located within the wheel member, with a spoke and hub configuration that allows for rotational power generation and suspension support, including a rotor, stator, and brake system integrated within the wheel assembly to avoid interference with chassis components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motor part is positioned outside the wheel member, then the motor can be easily assembled and maintained, but the motor part interferes with chassis parts and limits design freedom
Solution Approach 1:
The motor part is nested within the wheel member structure, with the stator positioned inside the wheel hub and the rotor rotating within the stator. This nesting arrangement eliminates external protrusions that would interfere with chassis parts while maintaining access to motor components through the wheel assembly, thus preserving design freedom without completely sacrificing assembly and maintenance accessibility.
Solution Approach 2:
The motor components are arranged in the radial and axial dimensions within the wheel hub space rather than extending outward in the lateral dimension. The stator is positioned in the radial direction within the hub, and the rotor extends axially, utilizing the three-dimensional space efficiently to avoid interference with chassis parts while maintaining motor functionality.
2Adaptability or versatility
If the motor part is integrated within the wheel member, then design freedom is increased and interference with chassis parts is eliminated, but the available space for motor components is limited
Solution Approach 1:
The motor part is segmented into distinct functional components: the stator is separated as a stationary component positioned in the radial direction within the hub, while the rotor is separated as a rotating component that can be independently assembled and removed. This segmentation allows for compact arrangement within limited space while maintaining functional integrity and assembly flexibility.
Solution Approach 2:
The rotor is designed as a dynamic component that rotates within the stator, with the hub part serving as a movable connection between the rotor and the wheel spoke. This dynamic arrangement allows the motor components to occupy minimal static space while providing full rotational movement capability, effectively maximizing the use of limited volume within the wheel member.
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
This design enhances design flexibility by ensuring the suspension part does not interfere with the in-wheel motor unit, allowing for efficient power transfer and increased freedom in vehicle suspension system design.
Implementation Method 1
a rotor member fixed to the spoke; a rotor fixed to the rotor member and having magnetism; a stator installed at a position facing the rotor, and having magnetism
Implementation Method 2
a hub outer race located outside the hub inner race with a hub bearing interposed therebetween, and connected to the knuckle part and constrained from rotating
Data Source
AI summary
An in-wheel motor unit may include: a rim member having a tire installed along an outer circumference thereof; a spoke connected to the rim member and rotated with the rim member; a motor part located in a mounting space formed by the rim member and the spoke, and configured to generate rotational power through power supply, and rotate the spoke; a knuckle part connected to the motor part and configured to support a suspension part; and a hub part having one side fixed to the spoke and the other side connected to the knuckle part, and configured to rotatably support the spoke.