Spindle Support Axial Passages for Compact Wheel Motor Cooling
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Solution Overview
Problem
Existing motorized wheels in electric vehicles face challenges in integrating a traction-braking device within the wheel rim due to size constraints from electric cables and liquid cooling systems, which limit the compactness and efficiency of the braking system.
Innovation Solution
A spindle support with axial passages for fluid pipes and cables, allowing for a stator assembly with liquid cooling and electrical connections, enabling a compact integration of a conventional disc brake system within the wheel rim, along with a split gasket for sealing, facilitates efficient cooling and electrical connectivity without interfering with rotating parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional disc brake system is integrated into the wheel rim, then the braking function is achieved, but the size constraints from electric cables and liquid cooling systems limit the compactness
Solution Approach 1:
The patent merges the liquid cooling system and electrical cable passage into a single integrated spindle support structure. The spindle support contains both cooling fluid channels and cable passage routes within its body, eliminating the need for separate mounting structures and reducing overall system volume while maintaining all necessary functions.
Solution Approach 2:
The patent implements nesting by placing the stator assembly inside the wheel rim structure, with the rotor nested around the stator. The brake disc is positioned between the rotor and wheel rim, creating a compact nested arrangement where multiple components occupy overlapping spatial volumes, thereby minimizing the overall braking system footprint.
2Ease of operation
If the central shaft is positioned away from the axis to accommodate fluid pipes, then the braking device can be provided, but the compactness and efficiency are reduced
Solution Approach 1:
The patent extracts the fluid pipes and electrical cables from the traditional side-mounted configuration and relocates them through the central spindle support structure. The spindle support contains dedicated internal channels for cooling fluid and separate passage routes for cables, allowing these elements to be routed through the center rather than occupying lateral space that would increase the wheel rim interior volume.
3Temperature
If the stator assembly is integrated with the spindle support, then the cooling performance is optimized, but the interference with rotating parts must be avoided
Solution Approach 1:
The patent applies local quality by providing cooling channels specifically within the spindle support structure that directly contact the stator assembly, while maintaining clear separation between the stationary spindle support and the rotating rotor. The cooling fluid channels are positioned to maximize thermal contact with the stator without extending into the rotational path of the rotor, ensuring effective cooling while preventing interference with rotating components.
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 solution allows for a high-performance, compact traction-braking device that can be integrated within a standard wheel rim, suitable for various electric vehicles, optimizing cooling performance and minimizing cost while maintaining efficient electrical connectivity.
Implementation Method 1
liquid cooling device is provided
Implementation Method 2
liquid fluid cooling of the stator
Implementation Method 3
stator assembly and to rotationally support the rotor and the motorized wheel
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Traction/braking device (50) for electric wheel motor comprising a stator assembly (2), a rotor (3), a braking system (4) with brake disc (45) rotating as one with the rotor, the stator assembly comprising a stub axle support (1), a stator body (21) and a cover (22) delimiting a stator cooling chamber (5), the stub axle support comprising a securing base (12) intended for connecting the traction/braking device (50) to the vehicle, the stub axle support (1) comprising three axial passages for two fluid pipes (14, 15) and one for the passage of cables (16), these three passages opening into a central zone (11) of the securing base.