Agricultural Gearbox Pivoting Shaft Mechanism for Safe Ratio Changes
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Solution Overview
Problem
Existing agricultural machine gearboxes require manual adjustment of gear teeth and often necessitate positioning near sharp work elements, posing safety risks and complicating the construction and maintenance of the machine.
Innovation Solution
A gearbox device with a pivoting mechanism that allows manual operation of primary, secondary, and intermediate shafts around their rotation axes when the motion transmission element is in the neutral position, enabling gear coupling without manual access to sharp tools and reducing construction complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of gear teeth is required to change transmission ratio, then the gearbox can achieve different gear ratios, but the user must access sharp work elements which creates safety risks
Solution Approach 1:
The patent introduces an intermediary mechanism (the pivoting means acting on the intermediate shaft) that mediates between the user's safe position and the gear teeth adjustment. By pivoting the intermediate shaft, the gear coupling is adjusted without requiring the user to manually access the sharp work elements, thus resolving the safety risk while maintaining gear ratio change capability
Solution Approach 2:
The patent implements preliminary action by positioning the motion transmission element in a neutral position before adjusting the gear coupling. This allows the intermediate shaft to be pivoted into the correct position for engagement, preparing the system in advance so that when the user operates the gearbox, the dangerous work elements are already in a safe state
2Ease of operation
If the gearbox is positioned near the work elements to access gear teeth for adjustment, then gear ratio change is possible, but the construction complexity increases and maintenance becomes more difficult
Solution Approach 1:
The patent resolves the spatial constraint by introducing a pivoting dimension for the intermediate shaft. Instead of requiring linear access to gear teeth, the intermediate shaft can pivot into position, allowing the gearbox to be located in a more convenient position that reduces construction complexity while maintaining ease of operation
Solution Approach 2:
The patent applies dynamics by making the intermediate shaft pivotable rather than fixed. This dynamic capability allows the shaft to automatically align and engage with the gear teeth during operation, simplifying the overall construction by eliminating the need for complex positioning mechanisms while maintaining ease of gear ratio adjustment
3Reliability
If coupling through adhesion is used to perform gear ratio change, then the motion transmission can be achieved, but the machine construction is complicated and requires regular maintenance
Solution Approach 1:
The patent replaces the adhesion-based coupling mechanism with a mechanical pivoting and engagement system. The intermediate shaft pivots into position and mechanically engages with the gear teeth through positive engagement rather than adhesion, eliminating the need for friction-based coupling and thereby reducing maintenance requirements while maintaining reliable motion transmission
Data Source
AI summary
A gearbox device for an agricultural machine includes: a primary shaft, a secondary shaft, at least one intermediate shaft, and a motion transmission element moveable between at least two operating positions in which it sets up intermeshing drive lines between the primary shaft and the secondary shaft with different gear ratios, at least one of the drive lines incorporating the intermediate shaft, the motion transmission element passing through at least one neutral position during its movement between the at least two aforementioned operating positions. The gearbox device further includes a manually-operated pivoting device that makes it possible to make at least one of the primary, secondary, and intermediate shafts pivot around its rotation axis when the motion transmission element is in the neutral position.