Gearbox Shift Lockout Using Rotation Sensor Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Disengaging or engaging gearing components during active operations in mechanical gearboxes can lead to damage or failure, and hydrostatic clutches, while addressing this, incur additional cost and complexity.
Innovation Solution
A system comprising a rotation sensor, shift solenoid, and microcontroller that prevents shifting between gear ratios by detecting gearbox operation, using a Hall effect sensor to inhibit solenoid activation when the gearbox is in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If shifting is allowed during active operations, then productivity is improved, but reliability deteriorates due to component damage
Solution Approach 1:
The system uses a rotation sensor to continuously monitor the rotational state of the gearbox and provides feedback to the microcontroller. The microcontroller processes this feedback and controls the shift solenoid accordingly, enabling shifting only when the gearbox is stationary. This closed-loop feedback mechanism ensures reliability by preventing shifts during operation while maintaining productivity through enabled shifting at appropriate times.
2Productivity
If hydrostatic clutches are used to enable shifting during operations, then productivity is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the complex hydrostatic clutch subsystem from the gearbox design. Instead of using hydraulic clutches to enable shifting during operation, the system uses a simple rotation sensor and microcontroller-based control to detect operational state and prevent shifting when inappropriate. This extraction of unnecessary complexity maintains productivity through software-based control while removing the need for additional hydraulic components.
3Reliability
If a rotation sensor and microcontroller control system is implemented, then reliability is improved by preventing shifts during operation, but device complexity increases
Solution Approach 1:
The invention replaces complex mechanical protection mechanisms with an electronic control system. Instead of using mechanical devices like hydrostatic clutches or mechanical interlocks to prevent shifting during operation, the system uses a rotation sensor and microcontroller to detect operational state and control the shift solenoid electronically. This substitution provides reliable protection against component damage while adding minimal complexity compared to mechanical solutions.
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
Prevents gearbox damage by ensuring shifting only occurs when the gearbox is stationary, reducing component failure and eliminating the need for costly hydrostatic clutches.
Implementation Method 1
The rotation sensor comprises a Hall effect sensor. The Hall-effect sensor may sense rotation of a target ring affixed to a planet carrier of a planetary gearset.
Data Source
AI summary
A system for preventing shifting between a plurality of gear ratios in a mechanical gearset. An operating sensor detecting rotation of a moving component in the mechanical gearset, a shift solenoid controlling shifting among the plurality of gear ratios, and a microcontroller communicatively coupled to the shift solenoid and the operating sensor that prevents activation of the shift solenoid when rotation is detected by the rotation sensor.