Gear Shift Actuator Magnet Layout for Accurate Shaft Position Sensing
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Solution Overview
Problem
Existing gear shift actuators face challenges in adapting to multiple rotational positionings of shift shafts without affecting the fidelity and position resolution of the position sensor assembly, particularly due to the rotation of the magnet arrangement relative to the magnetic field sensor during adjustment.
Innovation Solution
The magnet arrangement is configured with a circumferential extension between 45° and 220°, allowing the gear shift actuator to adapt to various rotational positionings by rotating the piston, ensuring the magnetic field sensor remains within a safety margin of the magnet arrangement, thus maintaining position sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the magnet arrangement is rotated to adapt to multiple rotational positionings of the shift shaft, then the adaptability of the gear shift actuator is improved, but the position sensor accuracy deteriorates due to rotation of the magnet arrangement relative to the magnetic field sensor
Solution Approach 1:
The magnet arrangement is given a circumferential extension in the rotational dimension (45° to 220°) so that radial rotation of the piston does not move the magnet arrangement out of the magnetic field sensor's detection range. This dimensional extension allows the system to adapt to multiple rotational positionings while maintaining position measurement accuracy.
2Adaptability or versatility
If the circumferential extension of the magnet arrangement is increased to cover larger rotational ranges, then the adaptability to multiple positionings is improved, but the device complexity increases
Solution Approach 1:
Multiple magnetic field sources are merged into a single circumferentially extended magnet arrangement on the piston. This unified structure provides coverage for multiple rotational positionings (45° to 220°) without requiring separate magnet arrangements for each positioning, thereby reducing overall device complexity while maintaining adaptability.
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 enables the gear shift actuator to compensate for shaft tolerances and component wear over time while maintaining precise position measurements, adapting to multiple rotational positionings and ensuring consistent accuracy and resolution.
Implementation Method 1
a magnetic field sensor which is mounted stationary in the actuator housing and which is connected to a control unit, which is adapted to analyze a signal of the magnetic field sensor to determine the position of the actuation rod
Data Source
AI summary
A gear shift actuator for linearly moving a shift shaft of a transmission in a shift direction between a neutral and an engaged position includes an actuator housing configured to be mounted in a predetermined relative positioning to a housing of the transmission, a linear drive assembly including an actuation cylinder and a piston movably received in the actuation cylinder, an actuation rod fixed to the piston and arranged to be coupled to the shift shaft, a pressure fluid conduit arrangement configured to be coupled to a pressure fluid source and connected to the actuation cylinder for selectively supplying pressure fluid to the actuation cylinder for driving the piston to move in a shift direction between positions corresponding to neutral and engaged positions of the shift shaft, and a position sensor assembly configured to sense a position of the actuation rod in the shift direction.