Rotary Shifter Overload Wheel With Flexible Torque Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electronic shifter assemblies in automatic transmissions are prone to failure and breakage due to excessive torque application, leading to operational issues and safety hazards when parts become stuck or malfunction.
Innovation Solution
A rotary shifter assembly with a flexible locking mechanism and overload wheel that allows temporary detachment of the shaft from the wheel when excessive torque is applied, preventing damage and ensuring continued functionality by allowing independent rotation of the shaft, while automatically re-engaging when torque returns within safe limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shaft and overload wheel are rigidly connected for concurrent rotation during normal operation, then gear shifting reliability is improved, but the system becomes vulnerable to breakage when excessive torque is applied
Solution Approach 1:
The locking fingers are designed to be flexible rather than rigid, enabling them to dynamically adapt their engagement state with the overload wheel. During normal operation, they maintain rigid coupling for reliable gear shifting. When excessive torque is detected, they flexibly disengage to protect the system, then automatically re-engage when torque returns to normal levels.
Solution Approach 2:
The system changes the engagement parameter between the shaft and overload wheel based on torque conditions. The locking fingers transition from a locked state (concurrent rotation) to an unlocked state (independent rotation) when torque exceeds thresholds, and automatically return to the locked state when torque is within safe limits, thereby adapting the mechanical coupling parameter to operating conditions.
2Manufacturing precision
If the locking mechanism prevents all rotation during normal operation, then gear shifting precision is improved, but the system cannot accommodate excessive torque without breakage
Solution Approach 1:
The locking mechanism is designed with preliminary protective action by incorporating flexible locking fingers that can detect excessive torque conditions and automatically disengage before catastrophic failure occurs. This preliminary anti-action prevents the harmful effect of excessive torque from propagating through the system while maintaining precision during normal operation.
Solution Approach 2:
The flexible locking fingers act as an intermediary element between the shaft and overload wheel. They mediate the torque transmission by being rigid enough to ensure precise gear shifting during normal operation, yet flexible enough to flex and disengage when excessive torque is applied, thereby protecting the system from damage.
3Reliability
If the shaft is allowed to rotate independently during excessive torque, then system protection is improved, but gear shifting functionality is temporarily compromised
Solution Approach 1:
The system incorporates beforehand cushioning by designing the locking fingers to automatically disengage under excessive torque, cushioning the blow before it can cause catastrophic failure. This protective mechanism temporarily sacrifices gear shifting functionality to prevent permanent system damage, ensuring long-term reliability.
Solution Approach 2:
The locking mechanism is self-regulating and automatically transitions between locked and unlocked states based on torque conditions without external intervention. When excessive torque is detected, it self-protects by allowing independent rotation; when torque returns to normal, it automatically re-engages for gear shifting functionality, serving itself without driver input.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the reliability and usability of automatic transmission systems by reducing instances of parts breakage and ensuring the vehicle remains operational even during irregular shifter assembly operations, thereby improving safety and reducing maintenance needs.
Implementation Method 1
The locking fingers are flexible and capable of moving relative to the wheel to permit temporary rotation of the shaft relative to the wheel when a force applied to the shaft is beyond a maximum torque threshold
Data Source
AI summary
A rotary shifter assembly for changing gears in a vehicle transmission includes a shaft (16) that is rotatably supported in a housing (12) and movable between radial positions for indicating a gear change. A shift knob (10) is coupled to a first end of the shaft for actuation by a user. A plurality of flexible locking fingers (40) extend from the second end, and an overload wheel (18) is disposed about the fingers. The fingers engage the wheel to couple it with the shaft for concurrent rotation. A locking mechanism (64) engages the wheel to selectively prevent and allow concurrent rotation of the wheel and shaft during normal operation. The fingers move relative to the wheel to permit temporary rotation of the shaft relative to the wheel when a force applied to the shaft is beyond a maximum torque threshold, and automatically return to concurrent rotation with the wheel once the force is below the threshold.