Pedaling Sensing Device for Electric Bicycle
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Solution Overview
Problem
Existing pedaling sensing devices for electric bicycles often fail to accurately detect and convert the rider's pedaling force into a reliable sensing signal, leading to inefficient power assistance, especially on hills or long distances, and can be tiring for older riders.
Innovation Solution
A pedaling sensing device comprising a crank axle, first and second gearwheels, a sensing unit, thrust bearing, elastic element, and assisting unit, where the gearwheels engage with bevel teeth to transfer pedaling force into a sensing signal for the motor, enabling precise force detection and power assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pedaling sensing device is used to detect rider's pedaling force, then the motor can generate assisting power, but the sensing accuracy is insufficient leading to inefficient power assistance
Solution Approach 1:
The sensing device is segmented into multiple functional components: a first bevel gear on the crankshaft, a second bevel gear in mesh with the first, a pinion gear in mesh with the second, and a sensing element. This segmentation allows each component to perform a specific function in the force transmission chain, improving the overall sensing accuracy and reliability by distributing the measurement function across multiple specialized elements rather than relying on a single sensing point.
2Device complexity
If the sensing device structure is simplified, then the device complexity is reduced, but the sensing signal conversion from pedaling force becomes unreliable
Solution Approach 1:
The patent replaces complex electronic sensing systems with a purely mechanical force transmission mechanism. The pedaling force is mechanically transmitted through a series of gearwheels (first bevel gear, second bevel gear, pinion gear) to a sensing element, converting the rider's input into a mechanical displacement that can be directly sensed. This mechanical substitution simplifies the device structure by eliminating the need for complex electronic sensors while maintaining reliable force conversion.
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 device effectively converts pedaling force into a sensing signal, allowing the motor to provide efficient power assistance, enhancing the riding experience by making pedaling easier and more energy-efficient, especially on challenging terrains.
Implementation Method 1
A plurality of first bevel teeth 111 are disposed annularly around the outer surface 11... The first gearwheel 2 comprises a first inner annulus surface 23 having an annular shape... The first inner annulus surface 23 is formed with a plurality of second bevel teeth 231 for engaging with the first bevel teeth 111
Implementation Method 2
An elastic element 6 is disposed around the crank axle 1 and located at one side of the first gearwheel 2 away from the thrust bearing 5... the elastic element 6 pushes the first gearwheel 2 toward the thrust bearing 5
Data Source
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AI summary
A pedaling sensing device of an electric bicycle is configured to connect to a motor (10) and includes a crank axle (1), a first gearwheel (2) disposed around the crank axle, a second gearwheel (3) disposed around the first gearwheel, a sensing unit (4), an assisting unit (7), and a chain wheel (8). The crank axle has first bevel teeth (111), and the first gearwheel has a first transmission structure (240) and second bevel teeth (231) matching the first bevel teeth. The second gearwheel has a second transmission structure (310) matching the first transmission structure. When the crank axle is driven by a force to rotate, the first gearwheel, second gearwheel and chain wheel are carried to rotate. The first gearwheel also moves with respect to the crank axle along the axial direction, so the sensing unit can sense the applied force. Then, the motor drives the assisting gearwheel (71) and chain wheel to rotate, thereby achieving assisting riding effect.