Shift Device Biasing Mechanism for Sensor Detection Accuracy
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Solution Overview
Problem
Existing shift lever devices face challenges in maintaining detection accuracy, particularly when subjected to high load forces and assembly errors, leading to separation between detection sensors and magnets, which affects the precise detection of shift positions.
Innovation Solution
The shift device employs a biasing mechanism, such as a compression coil spring, to maintain contact between a magnet and a printed wiring board, ensuring accurate detection by restricting separation and allowing for improved pivot operation, even under high load conditions, and is designed with a lateral detection configuration to minimize separation and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor switch and magnet are provided to detect shift position, then shift position detection is enabled, but separation between the sensor switch and magnet occurs under high load forces, reducing detection accuracy
Solution Approach 1:
The patent employs a compression coil spring as biasing means to dynamically adjust and maintain optimal contact pressure between the magnet and sensor switch during lever operation. The spring compensates for variations in load forces, ensuring consistent separation distance and reliable detection across different operating conditions
Solution Approach 2:
The patent modifies the physical parameters of the detection system by introducing a biasing force through the compression coil spring. This changes the contact pressure and separation distance parameters between the magnet and sensor switch, optimizing detection accuracy while maintaining reliable contact under varying load conditions
2Ease of operation
If the shift lever is designed to pivot freely for easy operation, then ease of operation is improved, but separation between the detection section and detection means increases, reducing measurement precision
Solution Approach 1:
The compression coil spring provides dynamic biasing that maintains optimal magnet-sensor contact pressure throughout the lever's range of motion. This allows the lever to pivot freely for ease of operation while the spring continuously adjusts to maintain precise detection conditions
3Device complexity
If no biasing means is provided to allow free pivoting, then device complexity is reduced, but separation between detection means occurs under load, worsening measurement precision
Solution Approach 1:
The compression coil spring serves multiple functions simultaneously: it provides biasing force to maintain contact pressure, compensates for assembly errors, absorbs load variations, and ensures consistent detection accuracy. This multi-functionality justifies the added component while delivering comprehensive performance improvements
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 configuration significantly improves the detection accuracy of shift positions by suppressing separation between the magnet and the detection sensor, reducing assembly errors, and maintaining effective detection even under high load conditions, while simplifying the device's structure and reducing component count.
Implementation Method 1
a compression coil spring, which biases the shift lever when the shift lever is pivoted
Data Source
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AI summary
In a shift device (10), a lever (22) is pivoted to change a shift position of the lever. A printed wiring board (38) detects a magnetic force generated by a magnet (40) of the lever to detect the shift position of the lever. Note that the lever is biased by a compression coil spring (32) to suppress separation between the magnet and the printed wiring board when the lever is pivoted. This accordingly enables excellent detection of the magnetic force of the magnet by printed wiring board, and enables the detection accuracy of the shift position of the lever to be improved.