EV Wheel Assembly Hub Speed Reducer Integration
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Solution Overview
Problem
Existing near-wheel mounted electric driving systems for electric vehicles face challenges in providing a large driving moment and high power density due to the large size of conventional speed reducers, which are not suitable for the limited mounting space in vehicles.
Innovation Solution
A wheel assembly with an electric driving system that includes a speed reducer integrated coaxially within the hub, utilizing intra-hub space to maintain compactness while enhancing output moment and power density, featuring a hub coupling member and planet gear transmission system for efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional speed reducer is added to increase driving moment and power density, then the output moment and power density are improved, but the overall size of the electric driving system increases significantly
Solution Approach 1:
The speed reducer is nested within the hub structure, utilizing the intra-hub space to accommodate the transmission components. This allows the speed reducer to be integrated into the existing wheel assembly without significantly increasing the overall external dimensions of the electric driving system.
Solution Approach 2:
The patent transitions from a conventional external mounting arrangement to an internal integration within the hub, effectively utilizing the three-dimensional space inside the hub to house the speed reducer components, thereby achieving compact integration.
2Force
If a conventional speed reducer is added to increase driving moment, then the output moment is improved, but the mounting space requirements exceed the limited space available in near-wheel mounted systems
Solution Approach 1:
The speed reducer components including the planet gears and carrier are nested within the hub structure, effectively utilizing the intra-hub space to accommodate the transmission components without requiring additional external mounting space.
Solution Approach 2:
The patent merges the speed reducer function with the hub structure by integrating the transmission components directly into the hub, combining multiple functions (structural support and power transmission) into a single integrated assembly.
3Ease of manufacture
If the electric driving system is mounted coaxially beside the wheel, then the mounting is simplified, but the available mounting space is severely limited
Solution Approach 1:
The electric driving system is merged with the hub structure, where the motor, speed reducer, and hub form an integrated assembly. This eliminates the need for separate mounting operations and reduces the space required by eliminating gaps between separate components.
Solution Approach 2:
The speed reducer and other transmission components are nested within the hub structure, utilizing the internal space of the hub to accommodate the driving system components without requiring additional external mounting space.
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 effectively increases the driving moment and power density of the electric driving system while maintaining structural compactness, utilizing intra-hub space to accommodate the speed reducer and driving system components, thus improving overall system efficiency and space utilization.
Implementation Method 1
a speed reducer which is transmission-connected to the downstream side of the driving device and has the speed-reduction function
Implementation Method 2
The wheel assembly comprises a wheel having a hub and an electric driving system used for driving the hub
Data Source
AI summary
A wheel assembly for an electric vehicle includes a wheel having a hub and an electric driving system for driving the hub. The electric driving system includes a driving device producing a driving moment. The hub defines an intra-hub space. The electric driving system further includes a speed reducer which is transmission-connected to a downstream side of the driving device and has a speed-reduction function. The electric driving system is coaxially connected to the hub, with at least a part accommodated in the intra-hub space.