Shift Device Connecting Member Segmentation for Motor Load Reduction
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Solution Overview
Problem
Existing shift devices lack a novel structure to efficiently manage transmission mode selection and automatic recovery to the parking mode, particularly in meeting customer demands for vehicles.
Innovation Solution
A shift device featuring a rotary detent member and a connecting member that can be moved between engaged and disengaged positions, controlled by a drive source and a control circuit, allowing for automatic mode switching to the parking mode when certain conditions are met, ensuring seamless operation and reduced motor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting member is engaged with both the knob and the rotary detent member to connect them during normal operation, then the transmission mode selection is stable and reliable, but the motor load increases and overcurrent may occur during automatic recovery operation
Solution Approach 1:
The connecting member is divided into a first connecting portion that engages with the knob and a second connecting portion that engages with the rotary detent member. During automatic recovery operation, only the second connecting portion remains engaged while the first connecting portion is disengaged, allowing the motor to rotate the rotary detent member independently without the mechanical constraint of the knob, thereby reducing motor load and preventing overcurrent while maintaining reliability of mode selection.
2Power
If the connecting member is disengaged from the knob during automatic recovery operation, then the motor load is reduced and overcurrent is prevented, but the control system complexity increases
Solution Approach 1:
The connecting member is designed to be movable between different engagement states. The control circuit dynamically controls the drive source to disengage the first connecting portion from the knob only when automatic recovery operation is required, while maintaining engagement during normal operation. This dynamic adjustment allows the system to reduce motor load during automatic recovery without permanently increasing structural complexity, as the connecting member itself provides the mechanical disengagement mechanism.
3Ease of operation
If the connecting member connects the knob and the rotary detent member during normal operation, then the transmission mode selection is intuitive and user-friendly, but the device cannot perform automatic recovery to parking mode without manual intervention
Solution Approach 1:
The connecting member is segmented into two distinct connecting portions: the first connecting portion that engages with the knob for manual operation, and the second connecting portion that engages with the rotary detent member for motor-driven rotation. During automatic recovery operation, the control circuit disengages the first connecting portion from the knob while maintaining engagement of the second connecting portion with the rotary detent member. This segmentation enables the system to provide both intuitive manual mode selection and automatic recovery capability, as the motor can rotate the rotary detent member to the parking mode position without requiring manual knob operation.
Data Source
AI summary
A shift device includes a knob rotated to select a mode of a vehicle transmission. A rotary detent member is rotated to a rotation position corresponding to the selected transmission mode. The rotary detent member is coaxial with the knob. A connecting member connects the knob and the rotary detent member when located at the first position. The connecting member is disconnected from the knob when located at the second position. A motor rotates the connecting member and the rotary detent member. During a normal operation in which a certain condition is unsatisfied, a control circuit controls the motor to hold the connecting member at the first position. When the certain condition is satisfied, the control circuit controls the motor to move the connecting member to the second position and move the rotary detent member to a rotation position corresponding to a parking mode.