Shift Actuator Assembly for Accurate Motor Angle Sensing
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Solution Overview
Problem
Existing shift devices face challenges in accurately controlling the relative positional relationship between the motor and the motor position detection sensor, leading to difficulties in improving the accuracy of the rotation angle position of the motor, which affects the overall shift position control.
Innovation Solution
A shift device with a first positioning portion that positions both the inner lid and the control board with respect to the housing, ensuring a common positioning reference for the motor and the rotation angle sensor, thereby enhancing the accuracy of the motor's rotation angle control and simplifying the structural complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor and control board are positioned by separate positioning references (bearing fixing portion and rear body respectively), then the structural complexity is reduced, but the accuracy of the relative positional relationship between the motor and motor position detection sensor deteriorates
Solution Approach 1:
The patent merges the positioning functions by making the control board the common positioning reference for both the motor and the motor position detection sensor. The control board includes a positioning protrusion that engages with a positioning recess on the motor, and another positioning protrusion that engages with the housing, thereby establishing a unified positioning reference system that improves relative positional accuracy while maintaining structural efficiency
2Ease of manufacture
If separate positioning references are used for the motor and control board, then the ease of assembly is improved, but the accuracy of rotation angle position detection deteriorates
Solution Approach 1:
The patent replaces complex mechanical positioning systems with a simplified positioning mechanism where the control board serves as the reference. The motor's rotation angle is detected relative to the control board through direct mechanical coupling via positioning protrusions and recesses, eliminating the need for separate positioning references and improving detection accuracy
Data Source
AI summary
A shift device includes: a shift switching member that includes a plurality of valley portions corresponding to a shift position; and an actuator that drives the shift switching member. The actuator includes a motor, a driving force transmission mechanism that transmits a driving force of the motor to an output shaft, a control board that includes a rotation angle sensor detecting a rotation angle of the motor and controls the motor based on a detection result obtained by the rotation angle sensor, a housing and an outer lid that form a housing space housing the motor and the control board, the outer lid covering an opening of the housing, and an inner lid that is housed in the housing space and to which the motor is attached, and the housing includes a first positioning portion that positions both the inner lid and the control board with respect to the housing.