Electric Bicycle Brake Lever with Hall-Effect Sensor
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Solution Overview
Problem
Conventional brake operating devices for electric bicycles suffer from poor sensitivity, lack of robustness, and inadequate braking effectiveness due to the limitations of contact switches.
Innovation Solution
A brake operating device featuring a brake lever with a magnetic ring, a Hall-effect sensor, and a hydraulic cylinder system, where the sensor's position is adjustable to modify magnetic field strength, enhancing sensitivity and effectiveness through a pivoting mechanism and adjustable magnetic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact switch is used in the conventional brake operating device, then the structure is simple, but the sensitivity is poor and the durability is low
Solution Approach 1:
The patent replaces the mechanical contact switch with a magnetic sensing system consisting of a magnetic ring and Hall effect sensor. This substitution eliminates mechanical wear and contact resistance issues while providing higher sensitivity and more reliable signal detection for brake operation detection.
Solution Approach 2:
The patent introduces a magnetic ring as an intermediary between the brake lever and the Hall effect sensor. The magnetic ring transmits the mechanical motion of the brake lever to the sensor through magnetic field changes, enabling non-contact detection while maintaining the functional relationship between the components.
2Reliability
If a contact switch is used in the conventional brake operating device, then the device structure is simple, but the braking effectiveness is inadequate
Solution Approach 1:
The patent replaces the unreliable mechanical contact switch with a magnetic sensing system that provides more reliable brake operation detection. The Hall effect sensor accurately detects the position and motion of the brake lever through magnetic field changes, ensuring consistent and effective braking response.
Solution Approach 2:
The patent makes the sensing system adjustable through the hollow threaded fastener, allowing the magnetic ring and sensor spacing to be dynamically optimized. This adjustability enables the system to adapt to different brake lever positions and maintain optimal sensing performance for reliable braking operation.
3Measurement precision
If the magnetic ring and sensor spacing is fixed, then the structure is simple, but the brake sensitivity cannot be adjusted
Solution Approach 1:
The patent makes the sensing system adjustable through the hollow threaded fastener, allowing the magnetic ring and sensor spacing to be dynamically optimized. This adjustability enables the system to adapt to different brake lever positions and maintain optimal sensing performance for reliable braking operation.
Solution Approach 2:
The patent allows the spacing parameter between the magnetic ring and Hall effect sensor to be changed through the adjustable hollow threaded fastener. By modifying this critical parameter, the brake sensitivity can be optimized for different applications and riding conditions without changing the overall system architecture.
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 improves the sensitivity and durability of the brake operation, providing a more effective braking mechanism by leveraging a pivoting magnetic ring and Hall-effect sensor, allowing for adjustable sensitivity and robust performance.
Implementation Method 1
A magnetic member adhered to one side of the cable anchoring member; a sensor comprising a sensing member disposed in the socket... adjustable brake sensitivity through a hollow threaded fastener that changes the magnetic field interaction between the magnetic ring and the sensor
Data Source
AI summary
A brake operating device of an electric bicycle is provided with a brake lever including a projecting plate at one end, and a bifurcated cable anchoring member pivotably secured to the projecting plate; a magnetic member adhered to one side of the cable anchoring member; a housing pivotably secured to the brake lever and including a hydraulic cylinder and a cylindrical socket including an opening distal the brake lever, and internal threads proximate the opening; a spring depressible sensor including a sensing member disposed in the socket, and an electric wire extending from the sensing member; a hollow threaded fastener adjustably threadedly secured to the internal threads of the socket to engage the sensing member; and a cylindrical member releasably mounted proximate to the opening and secured to the fastener. The electric wire passes the fastener and leaves the housing.