Rotatable Cooling Device for E-Bike Drive Heat Dissipation
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Solution Overview
Problem
Integrated electric drive devices in bicycles face challenges with heat dissipation, leading to reduced power output to avoid overheating, especially in carbon fiber frames which are poor at dissipating heat, making them visually unappealing and inefficient.
Innovation Solution
A cooling device with a heat sink, preferably made of thermally conductive materials like aluminum, is integrated into the drive housing, allowing heat to be dissipated externally through a rotatably mounted design that positions the cooling surface for optimal airflow and contact with the environment, ensuring constant power output and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the electric drive device is integrated into the bicycle frame, then the visual appearance is improved and protection from dirt and moisture is enhanced, but heat dissipation deteriorates leading to reduced power output
Solution Approach 1:
The drive unit is segmented into separate functional components: the motor housing integrated into the frame, and a detachable cooling device with heat sink that can be mounted separately on the motor housing. This segmentation allows the cooling device to be optimally positioned for heat dissipation while maintaining the integrated aesthetic of the frame integration.
Solution Approach 2:
The cooling device acts as an intermediary between the heat-generating motor components and the external environment. The heat sink with its extended surface area and fin structure serves as a thermal mediator, transferring heat from the motor housing to the surrounding air through convection and radiation, thereby solving the heat dissipation problem without compromising the integrated design.
2Adaptability or versatility
If the cooling device is rotatably mounted on the drive housing, then adaptability to different frame angles is improved, but device complexity increases
Solution Approach 1:
The cooling device is mounted rotatably on the motor housing, transforming it from a static component to a dynamic one that can be positioned at different angles. This dynamic mounting allows the cooling device to adapt to various frame geometries and installation angles, providing versatility in integration while keeping the mounting mechanism relatively simple through the use of a rotation joint.
3Productivity
If power output is increased, then productivity is improved, but heat generation increases leading to overheating
Solution Approach 1:
The cooling device with its extended heat sink surface area is pre-configured and positioned before the drive device operates at high power. This preliminary preparation ensures that the thermal management system is ready to handle the heat that will be generated during high-power operation, allowing the drive to maintain constant power output without overheating by having the cooling capability in place beforehand.
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 enables longer operation of integrated electric drive devices without overheating, allowing for constant power output and aesthetic integration into bicycle frames, even those made of carbon fiber, by effectively dissipating heat through enhanced thermal conductivity and airflow.
Implementation Method 1
The cooling device has a heat sink. The heat sink preferably has at least one outwardly directed cooling surface which is in contact with the environment.
Implementation Method 2
heat is transferred from the heat sink to the environment outside of the electric drive device. The heat is given off as warm air.
Implementation Method 3
When the bicycle is started up, that is to say when the bicycle is actuated, the heat sink is cooled down as a result of the relative wind. In this case, cold air flows around the heat sink as a result of the air currents or air turbulence that occur.
Data Source
Figure 1~2
AI summary
The present invention relates to a bicycle with an integrated electric drive device (1) comprising a drive housing (2) with heat sources (3, 8) and a cooling device (5) rotatably arranged relative to the drive housing (2) with a heat sink (6) for dissipating heat generated by the heat sources (3, 8) to the outside of the electric drive device (1).