Electronic Shift Lever Support Member Design
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Solution Overview
Problem
In shift-by-wire (SBW) systems, the integration of the output shaft and magnet rotor with a manual shaft leads to clearance and abrasion issues, causing position distortion of the output shaft and making disassembly difficult due to the press-fit coupling of metal components.
Innovation Solution
An electronic shift lever design that includes a support member with bearings to securely position the motor shaft, output shaft assembly, and magnet rotor, along with a magnet rotor with a magnetic body and identification groove, and an oil seal to prevent foreign materials and reduce friction, enhancing the robustness and assembly of the components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the output shaft and magnet rotor are integrally formed with a manual shaft, then the structure is simplified, but clearance and abrasion occur causing position distortion
Solution Approach 1:
A support member with bearing is introduced as an intermediary component between the output shaft and the magnet rotor assembly. The bearing supports the manual shaft, preventing direct contact and abrasion between the output shaft and magnet rotor, thereby eliminating clearance and position distortion while maintaining the integral structure.
2Reliability
If the output shaft and manual shaft are coupled in press-fit manner, then clearance is avoided, but disassembly becomes difficult
Solution Approach 1:
The coupling structure is segmented into modular components: the support member with bearing is separable from the housing, and the manual shaft is supported by this removable support member. This allows the manual shaft to be easily removed by taking out the support member, while maintaining stable connection during operation.
3Reliability
If bearings are added to support the motor shaft and magnet rotor, then robustness is improved, but device complexity increases
Solution Approach 1:
The support member serves multiple functions: it supports the manual shaft via bearing, provides a mounting structure for the magnet rotor, and acts as a structural element connecting to the housing. By combining these functions into a single support member, the number of components is minimized while achieving robust support.
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 design improves the robustness of the output shaft and magnet rotor by supporting the motor shaft and magnet rotor against external forces, reducing distortion and shake, and facilitating easy assembly and disassembly by preventing gaps and abrasion between metal components.
Implementation Method 1
a support member configured to support the motor shaft and the magnet rotor with respect to external forces in radial, axial, and tangential directions
Implementation Method 2
a Hall sensor configured to detect a rotational position of the magnet rotor
Data Source
AI summary
An electronic shift lever includes a motor part configured to generate a driving force according to an input signal from a controller which receives an input signal from a user, an output shaft assembly coupled to the motor part and rotated by a driving force of the motor part, a manual shaft coupled to the output shaft assembly and configured to receive the driving force of the motor part, a support member disposed between the motor part and the output shaft assembly and between the housing and the output shaft assembly, a magnet rotor having a first end into which the output shaft assembly is inserted and a second end through which the manual shaft passes, a Hall sensor configured to detect a rotational position of the magnet rotor, and the housing which accommodates the motor part, the output shaft assembly, the support member, and the Hall sensor.