Shift Rod Locking for Low-Force Sliding Gear Engagement
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Solution Overview
Problem
Existing manual transmission arrangements with sliding wheels face issues of gear disengagement under load, requiring high locking forces to maintain the gear position, which complicates smooth gear switching.
Innovation Solution
A locking device is implemented that securely locks the shift rod connected to the sliding wheel in engaged gears, using a coupling element like a movable pin or projection, and is actuated electrically via a control device that detects rotational movement on the differential to block the shift rod only when necessary, reducing switching forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device with high locking forces is used to prevent gear disengagement under load, then gear engagement reliability is improved, but shifting forces increase and gear switching becomes difficult
Solution Approach 1:
The locking device is designed to be dynamically controllable, switching between locked and unlocked states based on operational conditions. The control device receives signals from sensors detecting rotational movement and load conditions, then actuates the locking device accordingly - locked during high-load operations to prevent disengagement, unlocked during low-load shifting operations to enable easy gear changes.
Solution Approach 2:
The locking force parameter is changed based on operating conditions. The locking device applies high locking forces when load is detected (through sensors monitoring rotational movement and torque conditions) to ensure gear engagement reliability, and reduces or releases locking forces when load is low to facilitate smooth gear switching with minimal shifting forces.
2Stability of the object's composition
If the shift rod is locked to prevent movement out of meshing, then gear stability is improved, but the ability to switch gears smoothly is reduced
Solution Approach 1:
The locking device operates periodically rather than continuously - it is engaged and disengaged in cycles based on detected operational conditions. During periods of high load or stationary operation, the locking device is engaged to stabilize gear position. During periods requiring gear changes or low-load operation, the locking device is disengaged to allow smooth, rapid shifting. This periodic engagement/disengagement pattern maintains stability when needed while enabling quick gear switching when appropriate.
Solution Approach 2:
Sensors detect rotational movement, load conditions, and gear position, providing feedback signals to the control device. The control device processes this feedback and actuates the locking device accordingly - maintaining locked state when sensors indicate stable operating conditions, and releasing the lock when sensors detect shifting operations or load changes, thus adapting gear position stability to actual operational needs.
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
This solution ensures reliable gear switching with low switching forces and prevents gear disengagement under load, enhancing the reliability and efficiency of manual transmission operations.
Implementation Method 1
A rotational movement is detected at a differential driven by the intermediate shaft, so that the shift rod is only locked under load when the differential is driven.
Implementation Method 2
a locking device for switching the shift rod (7) into a locked state in which axial movement of the shift rod (7) is blocked
Implementation Method 3
A sliding gear (5) with internal toothing is arranged on the intermediate shaft (3) and is displaceable in the axial direction via a shift rod (7) to switch between different gears
Data Source
Figure 1
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Figure 3
AI summary
A gearshift arrangement (1) comprises a drive shaft (2) and an intermediate shaft (3) on which a sliding gear (5) is axially displaceable via a shift rod (7) to shift between different gears, wherein the gearshift arrangement (1) includes a locking device (20) which is configured to lock the shift rod (7) in at least one of the gears. The invention further relates to a method for actuating a gearshift arrangement (1).