Shear Pin Mounting for Agricultural Baler Flywheel
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Solution Overview
Problem
The existing agricultural baler design with a shear pin flange mounted over the flywheel experiences issues due to precise alignment requirements, leading to shear pin fatigue from bending forces and deformation, making it difficult to remove broken pin pieces and causing damage.
Innovation Solution
The agricultural baler employs different fixing means for the flywheel and shear pin flange, allowing independent positioning of the shear pin flange and flywheel, reducing bending forces and torques on the shear pin, and enabling a well-defined shearing plane, thus optimizing shear pin operation and preventing pin jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shear pin flange is mounted against the bearings of the flywheel with a predetermined force and precise alignment, then the flywheel rotation is enabled and force transmission is achieved, but the shear pin experiences bending forces and extra fatigue
Solution Approach 1:
The invention separates the mounting of the shear pin flange from the flywheel mounting. The shear pin flange is mounted independently on the central shaft at a different axial position than the flywheel, allowing the shear pin to be purely axially loaded without bending moments. This segmentation of mounting positions eliminates the bending forces that cause fatigue.
Solution Approach 2:
The invention introduces an intermediate positioning structure where the shear pin flange is mounted on the central shaft via a spline connection at a different axial position. This intermediate mounting arrangement acts as a mediator that decouples the shear pin loading from bending forces while maintaining proper force transmission through the shear pin.
2Manufacturing precision
If an intermediate distance of 0.1 mm is maintained between the flywheel and shear pin flange, then the shear pin is pulled against the flywheel at the pin position, but the shear pin experiences bending forces and deformation
Solution Approach 1:
The invention segments the axial positioning by mounting the shear pin flange at a different axial position than the flywheel. This eliminates the need for precise 0.1 mm spacing control and removes the bending forces that result from the asymmetric pull on the shear pin, allowing simpler manufacturing tolerances.
3Reliability
If the intermediate distance between flywheel and shear pin flange is maintained, then the shear pin can be pulled against the flywheel, but the shear pin may retract and become jammed between the flywheel and shear pin flange when broken
Solution Approach 1:
By mounting the shear pin flange at a different axial position on the central shaft, the invention eliminates the retraction space that allows pin fragments to become jammed. The segmented positioning prevents the formation of a gap where broken pin pieces could be trapped, making repair easier and more reliable.
4Reliability
If the shear pin flange is mounted on the central shaft with precise alignment requirements, then the force transmission is optimized, but the assembly and disassembly becomes difficult
Solution Approach 1:
The invention segments the mounting positions along the axial direction of the central shaft. The shear pin flange is mounted at one axial position while the flywheel is mounted at another, which eliminates the need for precise relative alignment between these components. This segmented arrangement maintains force transmission efficiency while greatly simplifying assembly and disassembly operations.
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 design reduces shear pin fatigue and extends its operational life by minimizing bending forces and torques, allowing for easier assembly and disassembly, and preventing material flow between the flywheel and shear pin flange during pin breakage.
Implementation Method 1
The shear pin is dimensioned such that the pin breaks when this determined force is exceeded. The shear pin thereby forms a protection for the pressing means.
Implementation Method 2
The transmission of force from the flywheel to the central shaft runs via the shear pin.
Implementation Method 3
The flywheel is provided for the purpose of forming a buffer between on the one hand the drive of the tractor (wherein a substantially constant force is produced over time) and on the other the pulse-wise force transmission to the pressing means (which displays large fluctuations over time).
Data Source
AI summary
An Agricultural baler having a flywheel that is driven via a drive shaft. The flywheel is connected to a pressing component of the baler via a central shaft, wherein the flywheel is mounted over the central shaft via bearings. Further mounted on the central shaft is a shear pin flange which is connected via a shear pin to the flywheel for the purpose of transmitting a rotation movement of the flywheel to the central shaft, wherein the flywheel is held over the central shaft via first fixing component and wherein the shear pin flange is connected to the central shaft via second fixing component.