Skateboard Motor Bell Assembly for Cooling and Easy Wheel Removal
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Solution Overview
Problem
Conventional skateboard wheel hub assemblies experience increased friction and overheating due to bulky motor assemblies with multiple deep groove ball bearings, leading to reduced motor performance and lifespan, and cumbersome disassembly processes.
Innovation Solution
A motor assembly design featuring a stator fixed to a shaft with a motor bell that has a free end for easy removal, incorporating a needle bearing assembly and angular contact ball bearings, along with a drive collar and rear plate for airflow and secure attachment, allowing for improved airflow and simplified disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional deep groove ball bearings are used in motor assembly, then the motor assembly is structurally stable, but friction increases and heat buildup occurs reducing motor performance
Solution Approach 1:
The patent changes the bearing type parameter from deep groove ball bearings to needle bearings, which have different friction characteristics and heat generation properties, thereby reducing friction and heat buildup while maintaining structural stability
Solution Approach 2:
The patent extracts and removes unnecessary bearing components from the motor assembly, keeping only the essential needle bearings at critical locations, which reduces overall friction and heat generation while maintaining necessary support functions
2Ease of operation
If multiple deep groove ball bearings are used to support wheel and motor bell, then the assembly is mechanically stable, but disassembly becomes cumbersome requiring separate removal steps
Solution Approach 1:
The patent merges the wheel and motor bell into a single integrated assembly where the motor bell is directly attached to the wheel hub, allowing both components to be removed together in one step while maintaining mechanical stability through the integrated structure
Solution Approach 2:
The patent segments the bearing support function into separate locations - one bearing supporting the wheel and another supporting the motor bell - allowing independent optimization of each support point while simplifying the overall disassembly process
3Temperature
If enclosed motor assembly is used, then mechanical protection is provided, but airflow is reduced causing overheating
Solution Approach 1:
The patent replaces the enclosed rigid motor assembly housing with an open-frame structure featuring thin metallic walls and strategic openings, which provides minimal mechanical protection while maximizing airflow to prevent overheating
Solution Approach 2:
The motor assembly incorporates open lattice structures and perforated surfaces that allow air to pass through multiple paths, enhancing cooling efficiency while maintaining structural integrity
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 design reduces friction and heat buildup, enhances motor performance, and simplifies the disassembly process by allowing airflow through the motor bell and enabling single-step removal of the wheel and motor bell, thus extending motor life and improving operational efficiency.
Implementation Method 1
a first end being adapted to be attached the wheel for transferring rotational movement of the motor bell to the wheel
Implementation Method 2
there is provided a first bearing assembly surrounding the shaft at the location of the joint of the fastening structure and the first end of the drive collar
Implementation Method 3
the bearing assembly comprises at least one angular contact ball bearings
Implementation Method 4
the first and second end of the motor bell comprise open ends permitting air flow therethrough
Data Source
AI summary
A motor assembly for a transport vehicle (such as a skateboard) having at least one wheel for rotating about a shaft having an end distal to the wheel and an end proximal to the wheel, the motor assembly comprising a stator fixed to the shaft, and a motor bell surrounding the shaft at the location of the stator, wherein the motor bell comprises a first end being adapted to be attached to the wheel for transferring rotational movement of the motor bell to the wheel, and a second end surrounding the shaft at the location of the end distal to the wheel, wherein the second end of the motor bell is a free end permitting removal of the motor bell during removal of the wheel. The motor bell being adapted to permit airflow therethrough for cooling of the motor assembly.