Shift Lever Lock Bar Mechanism for D-S Movement Restriction
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Solution Overview
Problem
Existing shift devices struggle to effectively restrict and permit movement of a shift body between different shift positions, particularly from the D position to the L/M/S position and vice versa, without allowing unnecessary pivoting.
Innovation Solution
A shift device with a restriction section that can be positioned in three states: restriction, intermediate, and permission, allowing controlled movement between shift positions by using a lock bar and detent groove mechanism, where the lock bar is biased to restrict movement when not actively permitted by a motor-controlled cam system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-position restriction mechanism is used, then the structure is simple, but it cannot restrict movement in both directions (from D to L/M/S and from L/M/S to D)
Solution Approach 1:
The restriction section is designed to be movable between three positions (first, second, and third positions) rather than being fixed. This dynamic positioning allows the same restriction mechanism to adaptively control movement in both directions by changing its position based on the shift body's location, thereby achieving bidirectional control without requiring two separate restriction mechanisms.
Solution Approach 2:
The restriction section serves multiple functions by being capable of operating in three different positions. In the first position, it restricts movement from D to L/M/S; in the second position, it restricts movement from L/M/S to D; and in the third position, it permits movement in both directions. This multi-functional design eliminates the need for separate restriction mechanisms for each direction.
2Ease of operation
If movement restriction is always active, then unnecessary pivoting is prevented, but legitimate shift position changes cannot be made
Solution Approach 1:
The restriction section dynamically switches between restriction and permission states based on the shift body's position. When the shift body is in intermediate positions, the restriction section remains in the first or second position to prevent unnecessary pivoting. When the shift body reaches the first or second shift position, the restriction section can move to the third position to permit legitimate shift position changes, thus balancing operational flexibility with stability.
3Adaptability or versatility
If a release button mechanism is used, then shift lever movement can be permitted, but the mechanism cannot restrict movement from L/M/S to D position
Solution Approach 1:
The restriction section is designed to move between three positions based on the shift body's location and operational needs. This dynamic positioning allows the single restriction section to replace the need for separate mechanisms for different movement directions, achieving comprehensive movement control coverage while maintaining relatively simple mechanism structure.
Data Source
AI summary
In a shift device, when a lock lever is disposed at a restriction position or an intermediate position, a detent groove of a lever is abutted by the lock lever, and pivoting of the lever from a D position toward an S position, and pivoting of the lever from the S position toward the D position, is restricted. However, when the lever is disposed at the D position or the S position, by moving the lock lever to a permitted position, the detent groove does not abut the lock lever and so pivoting of the lever from the D position toward the S position and pivoting of the lever from the S position toward the D position is permitted. Thus, pivoting of the lever from the D position toward the S position and pivoting of the lever from the S position toward the D position can be restricted and permitted.