Shift Device Position Detection Using Integrated Lock Gear Magnet
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Solution Overview
Problem
Existing shift devices lack effective detection mechanisms for the positions of rotation members and rotation restriction sections, which hinders precise control and operation.
Innovation Solution
A shift device is designed with a rotation body that changes shift positions through rotation, featuring multiple rotation members, a rotation restriction section, and a detection section at one of the rotation members to detect the position of the restriction section, enabling precise detection of both the rotation member and restriction section positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple rotation members are used to control the shift position, then the shift control functionality is improved, but the difficulty of detecting positions of all components increases
Solution Approach 1:
The detection section is designed to detect positions of multiple rotation members (rotor cam and lock gear) using a single detection mechanism. The detection section detects the position of the rotor cam and the lock gear simultaneously, making the detection system multi-functional and reducing the need for separate detection mechanisms for each component.
2Device complexity
If a detection section is provided at only one rotation member, then the device complexity is reduced, but the measurement precision of multiple components is compromised
Solution Approach 1:
The lock gear serves as an intermediary element that connects the detection section to both the rotor cam and the rotation restriction section. By detecting the position of the lock gear, the system indirectly obtains position information of the rotor cam and the rotation restriction section, achieving precise measurement of multiple components through a single detection point.
3Reliability
If the position of rotation restriction section is to be detected accurately, then control reliability is improved, but the device complexity increases due to additional detection mechanisms
Solution Approach 1:
The detection function for the rotation restriction section is merged with the detection function for the rotor cam position. The detection section detects both the rotor cam position and the rotation restriction section position simultaneously through a single detection mechanism, reducing overall system complexity while maintaining high reliability.
Data Source
AI summary
In a transmission mechanism, a motor is driven to rotate a rotation shaft, thereby rotating a rotor cam and a lock gear through a worm gear, a helical gear, and an intermediate gear. A cam is rotated integrally with the lock gear, thereby causing a lock bar to move to a position to restrict rotation of a knob and to a position to release rotation-restriction of the knob. A magnet is provided at the lock gear, and the magnet rotates integrally with the lock gear. Accordingly, the position of the rotor cam and the position of the lock bar can be detected from the position of the magnet.