Shift Device Direct Detection Mechanism
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Solution Overview
Problem
Existing shift lever devices have limitations in precision when detecting shift positions, particularly in the first and second directions, due to indirect actuation mechanisms and limited movement amplification.
Innovation Solution
The shift device incorporates a movable shift body and a detection section, where the shift body directly actuates the detection section in the first direction and the moving body actuates it in the second direction, with amplification of movement and guided movement to enhance precision, and includes a rotating portion and a stopping portion to control movement and communication between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the shift lever actuates the detection mechanism through the link when rotated in the front-rear direction, then the shift position can be detected, but the detection precision in the first direction is reduced
Solution Approach 1:
The patent divides the detection mechanism into two independent parts: one for detecting the first direction (front-rear rotation) and another for detecting the second direction (left-right rotation). The first detection mechanism directly detects the shift lever's front-rear rotation, while the second detection mechanism detects the link's rotation. This segmentation eliminates the indirect actuation problem and improves detection precision for both directions independently.
Solution Approach 2:
The patent introduces an intermediary mechanism (the link) that specifically handles the second direction detection. The link rotates when the shift lever moves left-right, and this rotation is detected by the second detection mechanism. This intermediary approach allows the first direction to be detected directly without interference, while still capturing the second direction information through the link's rotation.
2Measurement precision
If a link is used to transmit motion from the shift lever to the detection mechanism, then the shift position can be detected in both directions, but the detection precision is reduced due to indirect actuation
Solution Approach 1:
The patent segments the detection functions so that the first direction (front-rear) is detected directly by the first detection mechanism, while the second direction (left-right) is detected through the link's rotation by the second detection mechanism. This segmentation ensures that the direct actuation capability is maintained for the primary direction while still capturing secondary direction information.
Solution Approach 2:
The link serves multiple functions: it transmits the shift lever's left-right motion to the second detection mechanism, and its rotation position also provides information about the shift lever's position. The universal design allows one component (the link) to serve both motion transmission and position indication purposes without compromising detection precision.
3Measurement precision
If the movement amount of the moving body is amplified with respect to the movement amount of the shift body, then the detection precision in the second direction is improved, but the device complexity increases
Solution Approach 1:
The patent transforms the linear movement amplification problem into a rotational dimension. The link's rotation angle provides amplified detection capability for the second direction without requiring complex mechanical amplification mechanisms. By detecting the rotational position of the link rather than attempting to amplify linear movement, the system achieves improved detection precision while maintaining simplicity.
Data Source
AI summary
In a shift lever device, a lever moves an operation member when the lever is rotationally operated in a front-rear direction, and the lever rotates a select link such that the select link moves the operation member when the lever is rotation operated in a left-right direction. The position of the operation member is detected to detect a shift position of the lever. When the lever is rotation operated in the front-rear direction, the lever therefore moves the operation member without being through the select link, thereby enabling the precision with which the shift position of the lever in the front-rear direction is detected to be raised.