Monostable Rotary Shifter With One-Bump Direct Gear Selection
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Solution Overview
Problem
Existing rotary shifter technologies lack efficient monostable one-bump functionality for seamless gear selection and direct shift capabilities between Park, Reverse, Neutral, Drive, and Manual positions, with limited tactile feedback and complex mechanical configurations.
Innovation Solution
A rotary shifter assembly with a knob-shaped handle, a printed circuit board assembly, and a spur gear system, incorporating a magnet and ring gear for position sensing, along with torsional springs or spring-loaded pawls for monostable shifting and direct shift functionality, providing tactile feedback and simplified operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional rotary shifter configurations are used, then gear selection is possible, but the mechanical structure becomes complex and tactile feedback is limited
Solution Approach 1:
The patent replaces complex mechanical position-sensing mechanisms with a magnet and Hall effect sensor system. The magnet is attached to the rotatable element, and the Hall sensor detects its position electronically, eliminating the need for complex mechanical linkages and position detectors while maintaining precise gear selection capability.
Solution Approach 2:
The patent introduces variable resistance elements that change electrical resistance based on rotational position. This allows the system to detect gear position through electrical parameter changes rather than mechanical means, simplifying the overall mechanical configuration while providing clear tactile and electronic feedback.
2Productivity
If monostable one-bump functionality is implemented, then gear selection becomes seamless, but direct shift capability between distant positions is lost
Solution Approach 1:
The patent makes the shifter system dynamically adaptable by detecting the direction and duration of rotation. When the user rotates the dial quickly in one direction, the system interprets this as a direct shift command and jumps to the corresponding distant gear position. When rotated slowly or briefly, it performs incremental one-bump shifting. This dynamic response allows both seamless single-step shifting and rapid direct shifting between distant positions.
Solution Approach 2:
The system uses Hall sensors and variable resistance elements to provide real-time feedback on rotational position and velocity. This feedback enables the control system to distinguish between intentional direct shift commands (fast rotation) and normal sequential shifting (slow rotation), automatically adapting the shifting behavior to match user intent.
3Measurement precision
If multiple sensors and processing components are added, then position sensing accuracy improves, but device complexity increases
Solution Approach 1:
The patent designs the PCBA so that the same Hall sensor and variable resistance elements serve multiple functions: detecting rotational position, determining rotation direction, measuring rotation velocity, and triggering different shifting modes. This multi-functionality eliminates the need for separate sensors for each detection task, maintaining high measurement precision while minimizing the number of components.
Solution Approach 2:
The patent combines the magnet position detection and electrical resistance measurement functions into a single integrated PCBA system. The Hall sensor and variable resistance elements work together on the same circuit board, sharing common signal processing resources and reducing the overall component count while maintaining accurate position sensing throughout the rotation range.
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
Enables smooth, single-bump monostable gear selection and direct shift between gear positions with enhanced tactile feedback, improving user experience and reducing mechanical complexity.
Implementation Method 1
A magnet is supported upon the spur gear in proximity to the sensor and is influenced by a ring gear configured upon a lower circumference of the handle, so that rotation of the knob shaped handle causes displacement of the magnet relative to the PCBA sensor
Implementation Method 2
A torsional spring is secured to the housing and has first and second legs alternatively abutting the interior extending actuating portion in response to rotation in either of clockwise or counter clockwise rotation
Data Source
AI summary
A rotary shifter having a knob bi-directionally and biasingly supported upon a housing in a monostable and return-to-center orientation. A printed circuit board assembly is incorporated into the housing and includes a sensor and a processor. A spur gear is rotatably supported within the housing and actuated by the knob, the spur gear supporting a magnet in proximity to the sensor. Rotation of the knob causing rotational displacement of the magnet relative to the sensor in order for the processor to instruct a change in shifter position. The knob incorporating a graphical display for indicating a current shifter position of the assembly.