Saddle-Type Electric Vehicle Motor Water Jacket Positioning
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Solution Overview
Problem
The maintenance of motors in saddle-type electric vehicles is hindered by the interference of reduction gears with water jackets during attachment and detachment, leading to deteriorated maintenance properties.
Innovation Solution
A design where the water jacket is positioned opposite to the reduction gear, allowing for removal without interfering with the housing, and a flange section is used to secure the water jacket, enabling easy attachment and detachment while maintaining sealability, and a spiral flow path for even cooling is implemented.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reduction gear is disposed on one side of the motor, then the motor output can be reduced, but the water jacket attachment and detachment become difficult due to interference with the reduction gear
Solution Approach 1:
The water jacket is positioned on the opposite side of the motor from the reduction gear, utilizing the radial dimension of the motor assembly. This spatial arrangement allows the water jacket to be attached to and detached from the motor without interfering with the reduction gear, thereby improving maintenance properties while maintaining a compact overall structure.
2Temperature
If the water jacket surrounds the stator for effective cooling, then cooling performance is improved, but the water jacket interferes with the reduction gear during maintenance
Solution Approach 1:
The motor assembly is functionally segmented into two sides: one side houses the reduction gear while the opposite side accommodates the water jacket. This segmentation allows the cooling function (water jacket surrounding the stator) and the gear function (reduction gear) to operate independently without interfering with each other during maintenance operations.
3Ease of repair
If the flange section is positioned on the opposite side of the reduction gear, then the water jacket can be easily removed, but the sealing structure becomes more complex
Solution Approach 1:
The flange section is extracted from the main body of the water jacket and positioned on the opposite side of the motor from the reduction gear. This extracted flange serves as a dedicated attachment and detachment interface, allowing the water jacket to be easily removed for maintenance without requiring disassembly of the reduction gear or other motor 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 design improves maintenance efficiency by allowing water jacket removal without affecting the reduction gear, reduces the size of the motor apparatus, and enhances cooling performance, simplifying the structure and improving maintenance properties.
Implementation Method 1
a water jacket that is disposed to surround the stator in the accommodating space and that is configured to cool the motor
Data Source
AI summary
An electric bicycle includes a motor that includes a stator and a rotor and that is driven by a battery, a reduction gear, an output shaft configured to output power of the motor, a sprocket fixed to the output shaft, a housing, and a water jacket configured to cool the motor. The water jacket includes a flange section protruding outward in a radial direction of the stator, the flange section being formed in the water jacket at a side opposite to the reduction gear in a vehicle width direction.