E-bike Frame Battery Integration and Dropper Post Routing
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Solution Overview
Problem
E-bikes face limitations in power usage due to speed restrictions and require efficient integration of batteries, motors, and sensors within the frame structure, while also needing adaptable seat post mechanisms for optimal performance and user convenience.
Innovation Solution
The e-bike design incorporates a frame structure with a bottom shell and hollow tubes for housing the motor and battery, allowing for secure and removable positioning, along with a dropper seat post actuation system facilitated by a control housing and routing tube, and a speed sensor assembly with a compact sensor mount for accurate speed measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the battery and motor are securely integrated into the frame structure, then the stability and handling of the e-bike are improved, but the accessibility and ease of removal of these components deteriorate
Solution Approach 1:
The battery and motor are designed as separate, modular assemblies that can be independently installed and removed from the frame structure. Each component has dedicated mounting interfaces that allow for secure attachment during operation while enabling easy removal when needed for charging or maintenance.
Solution Approach 2:
The mounting system transitions between two states: a locked state during operation that provides structural stability, and an unlocked state that allows for easy removal. The mounting mechanism includes movable locking elements that can be quickly engaged or disengaged to change the state of component attachment.
2Ease of operation
If the dropper seat post mechanism is integrated into the frame with control housing and routing tubes, then the ease of operation for seat height adjustment is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The control housing serves multiple functions: it houses the actuator mechanism for the dropper seat post, provides a mounting point for the control cable routing, and acts as a structural element of the frame. This multi-functionality reduces the need for separate components and simplifies the overall system.
Solution Approach 2:
The control cable routing tubes are integrated within the control housing structure, with the routing path nested through the housing walls. This nesting approach eliminates the need for separate external routing channels and reduces the number of discrete parts.
3Measurement precision
If the speed sensor assembly is mounted on the frame with a compact sensor mount, then the measurement precision for speed sensing is improved, but the device complexity increases
Solution Approach 1:
The sensor mount is integrated directly into the frame structure, combining the mounting function with the frame itself. This eliminates the need for separate mounting brackets or adapters, reducing component count while maintaining precise sensor positioning for accurate speed measurement.
4Stability of the object's composition
If the center of mass is lowered for improved handling and maneuverability, then the stability and handling are improved, but the design complexity and manufacturing difficulty increase
Solution Approach 1:
The frame structure employs asymmetric design elements, with the bottom shell and tube configurations optimized to position the battery and motor assemblies lower in the frame. This asymmetric layout naturally lowers the center of mass without requiring additional complex structural elements, as the weight distribution is built into the fundamental frame geometry.
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 enhances handling and maneuverability by lowering the center of mass, improves battery and motor accessibility, and ensures precise speed sensing, addressing power usage limitations and user convenience.
Implementation Method 1
an inductive sensor may be attached to the e-bike frame, and one of the wheels may be provided with a magnet that rotates with the wheel. As the magnet rotates with the wheel, the sensor detects the magnet passing by and counts the number of revolutions of the wheel.
Data Source
AI summary
An ebike comprises a front wheel, a rear wheel, a frame structure supported on the front wheel and the rear wheel, a crank assembly, and a battery assembly. The frame structure can include a front fork supported on the front wheel, a head tube coupled to the front fork, and a down tube extending downward and rearward from the head tube, the down tube defining a down tube axis and being open at its lower end. The crank assembly can be supported by the frame structure and can be rotatable about a crank axis that is spaced rearward from the down tube axis. The battery assembly can be at least partially secured in the down tube in an installed position and can be slidable into the down tube from the lower end of the down tube along the down tube axis.