Shift Lever Locking Mechanism for Park-to-Stow Rotation Control
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Solution Overview
Problem
Automotive transmissions lack a reliable mechanism to prevent the gear shift lever from unintentionally rotating into storage, increasing the risk of accidents due to inadvertent driver operation.
Innovation Solution
An automotive transmission system with a lever assembly, locking parts, and a moving part that allows the lever to rotate only when shift conditions are met, and enables or prevents rotation from the Park position to a stow position, utilizing a combination of locking parts and a moving part to block or enable the lever's rotation based on predetermined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gear shift lever is disposed to protrude to the inside of the vehicle to allow easy shift operation, then the ease of operation is improved, but the internal space utilization deteriorates
Solution Approach 1:
The gear shift lever is designed to be movable between a protruding position (when the vehicle is operating) and a stowed position (when the vehicle is not operating). This dynamic repositioning allows the lever to provide easy access during operation while maximizing internal space utilization when not in use, thereby resolving the contradiction between ease of operation and space efficiency.
2Volume of moving object
If the gear shift lever is stowed in a predetermined storage space to improve internal space efficiency, then the volume utilization is improved, but the reliability deteriorates due to unintentional rotation
Solution Approach 1:
A shift lock mechanism is implemented that proactively prevents the gear shift lever from rotating unintentionally. The lock engages with the lever at specific positions (such as the Park position) and requires fulfillment of predetermined conditions (such as brake pedal depression) to disengage and allow rotation. This preliminary protective action eliminates the risk of inadvertent operation while maintaining the space-efficient stowed configuration.
3Reliability
If a full shift lock function is implemented to prevent inadvertent operation in all gear stages, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The shift lock mechanism is designed to provide enhanced locking protection at specific critical positions (such as the Park position and other gear stages) rather than implementing a uniformly complex mechanism throughout. The lock engages with the lever at discrete positions and releases based on predetermined conditions, providing reliable prevention of inadvertent operation where needed while maintaining simpler operation during normal gear shifting, thereby balancing reliability with acceptable complexity.
Data Source
AI summary
An automotive transmission capable of preventing a lever from unintentionally rotating from one position to another position is provided. The automotive transmission includes a lever assembly including a lever which rotates between a plurality of positions about a rotational axis thereof to select one of a plurality of gear stages; a plurality of locking parts rotating integrally with the lever and disposed at different locations in a direction of the rotational axis of the lever to be spaced apart by a predetermined distance in a direction of rotation of the lever and thus to block the rotation of the lever in at least one direction about the rotational axis of the lever; and a moving part moving in the direction of the rotational axis of the lever to allow one side thereof to be placed on at least one of paths of rotation of the plurality of locking parts.