Shift Lever Apparatus Guide Groove Gate Mechanism
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Solution Overview
Problem
Existing shift lever apparatuses for motor vehicles face difficulties in preventing erroneous operation when shifting gears in an oblique direction, leading to uncomfortable shift feelings and potential misalignment between automatic and manual transmission modes.
Innovation Solution
A shift lever apparatus with a zigzag patterned guide groove system, a detent pin, and gate portions that limit movement to a specific direction, ensuring the shift lever moves only orthogonally and preventing oblique direction forces from causing erroneous entries between guide grooves, thereby enhancing tactile feedback and reducing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first guide groove and connection transfer channel are connected at an acute angle to prevent erroneous operation, then the reliability of shift position control is improved, but the ease of operation deteriorates as the driver must consciously shift the lever in an oblique direction
Solution Approach 1:
The patent introduces a second guide groove as an intermediary path between the first guide groove (automatic transmission area) and the connection transfer channel (manual transmission area). This intermediate groove provides a smooth transition path that guides the shift lever from the oblique acute angle connection to the manual transmission area, eliminating the need for conscious oblique shifting while maintaining reliable position control through the structured groove geometry
2Adaptability or versatility
If the shift lever apparatus allows movement in both widthwise and front-rear directions, then the adaptability is improved, but the measurement precision of shift lever direction deteriorates making it difficult to transmit force in only one direction
Solution Approach 1:
The patent segments the shift lever's movement path into distinct directional zones using multiple guide grooves. The first guide groove handles automatic transmission positioning, the second guide groove manages the transition, and the connection transfer channel handles manual transmission positioning. This segmentation ensures that force is transmitted accurately in the intended direction for each segment while maintaining overall adaptability through the multi-directional groove system
Data Source
AI summary
A shift lever apparatus includes a detent pin, and the distal end portion thereof is attached to a shift lever so as to be movable in the direction of coming into and out of contact with the shift lever. A lever guide is formed with a transition sliding surface on which the distal end of the detent pin slides along the operation of the shift lever on the back surface thereof. A gate portion is provided on the transition sliding surface, and limits the direction of movement of the detent pin in the direction practically matching the selecting direction by coming into contact with the distal end portion of the sliding detent pin. Accordingly, the direction of movement of the shift lever is limited only to the direction practically matching the selecting direction by a force transmitted from the gate portion via the detent pin when the shift lever passes through a transition guide groove.