Magnetized Cylindrical Rotor Throttle Grip for Stable Feedback
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Solution Overview
Problem
Conventional throttle grip devices using magnetic sensors for controlling throttle valves lack a stable operation feeling and are difficult to downsize due to the need for friction plates, which wear out and require complex arrangements.
Innovation Solution
A throttle grip device with a magnetized cylindrical member and magnetic sensor that rotates with the throttle grip, generating a resistance force to provide operation feedback and eliminating the need for friction plates, allowing for both angle detection and feedback using a single magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If friction plates are used to generate operation feeling, then operation feedback is provided to the driver, but the device size increases and components wear out
Solution Approach 1:
The patent merges the magnet and cylindrical member into a single integrated component where the magnet is housed within the cylindrical member. This combination eliminates the need for separate friction plates while maintaining operation feedback through magnetic resistance, directly resolving the contradiction between providing operation feeling and reducing device complexity
Solution Approach 2:
The patent replaces the mechanical friction-based feedback system with a magnetic field-based system. The magnet and cylindrical member generate magnetic resistance that provides operation feeling without physical contact and wear, eliminating the need for friction plates and their associated complexity
2Ease of operation
If friction plates are used to generate operation feeling, then operation feedback is provided to the driver, but the device becomes difficult to downsize
Solution Approach 1:
The magnet is integrated within the cylindrical member, creating a compact unified structure. This merging eliminates the need for additional friction plate components and their mounting space, enabling downsizing while maintaining operation feedback through the magnetic resistance mechanism
Solution Approach 2:
The magnet is nested within the cylindrical member, with the magnet housed inside the cylindrical structure. This nesting arrangement maximizes space utilization and minimizes the overall device volume while maintaining the magnetic feedback mechanism, directly addressing the downsizing requirement
3Ease of operation
If friction plates are used, then operation feeling is generated, but the plates wear out changing the operation feeling
Solution Approach 1:
The patent replaces the wear-prone mechanical friction system with a magnetic field-based system. The magnet and cylindrical member interact through magnetic fields without physical contact that causes wear, ensuring stable and consistent operation feeling throughout the device lifetime
Solution Approach 2:
The invention uses non-consumable magnetic components instead of wear-prone friction plates. The magnet and cylindrical member are designed to maintain their magnetic properties without degradation from friction, eliminating the need for replacement and ensuring long-term reliability
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 stably imparts operation feedback to the driver without friction plates, reducing component count and enabling downsizing by integrating the magnetic sensor and magnet within the handlebar.
Implementation Method 1
The accelerator position sensor outputs the rotation angle of the throttle grip as an electric signal by detecting change in the direction and the density of magnetic lines of the magnet rotating in conjunction with the rotation of the throttle grip by the magnetic sensor
Implementation Method 2
The cylindrical member is magnetized by the magnet and the magnetic force generates a resistance force against the rotation of the magnet. The resistance force against the rotation of the magnet imparts an operation feeling to the driver
Data Source
AI summary
Provided is a throttle grip device that can stably generate an operation feeling and achieves downsizing itself. A throttle grip device includes a throttle grip attached to a handlebar, an accelerator position sensor, and a return spring. The accelerator position sensor and the return spring are accommodated inside the handlebar so as to be arranged tandemly along a straight line. The accelerator position sensor includes a cylindrical inner rotor in which a plurality of magnetic poles is magnetized along a circumferential direction, a magnetic material-made outer case configured to accommodate the inner rotor, and a sensor IC disposed facing a sensor side end of the inner rotor and offset from a central axis of the inner rotor. The inner rotor rotates in conjunction with the throttle grip.