Variable Angle Disc Hub for Tiller Jump Arm
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Solution Overview
Problem
Current tilling machines face difficulties in maintaining disc alignment and orientation, especially in challenging soil conditions, leading to inefficiencies and the need for time-consuming adjustments or replacements.
Innovation Solution
A tilling machine equipped with a variable angle disc hub assembly and jump arm spacers that allow for adjustable disc positioning and secure mounting, ensuring consistent disc alignment and easy replacement, even in rocky terrain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If discs are secured to the tilling machine frame using multiple bolts (4-8 bolts), then the disc mounting is secure and stable, but the time required to change or adjust discs increases significantly
Solution Approach 1:
The disc hub assembly is divided into separable components: a hub body that remains mounted on the jump arm, and a disc that can be independently attached and detached. This segmentation allows the disc to be changed without removing or adjusting the entire hub assembly, significantly reducing replacement time while maintaining secure mounting through the hub's bolt interface to the frame.
2Manufacturing precision
If discs are rigidly fixed to the frame, then disc alignment is precise, but the machine cannot adapt to rocky soil conditions without damaging the discs
Solution Approach 1:
The jump arm assembly incorporates a disc hub with rotational freedom relative to the jump arm, allowing the disc to dynamically adjust its orientation when encountering rocks or obstacles. This dynamic capability enables the disc to pivot or rotate upon impact rather than being rigidly constrained, preventing damage while the hub maintains the disc's operational alignment through its mounting geometry.
3Reliability
If the disc hub assembly allows disc rotation or lateral movement, then the machine can handle rocky terrain, but gaps appear in the tilled soil due to misalignment
Solution Approach 1:
The disc hub assembly serves as an intermediary component between the jump arm and the disc, providing a controlled rotational interface. This intermediary allows the disc to rotate or pivot when needed for rocky terrain while maintaining a defined geometric relationship with the jump arm, ensuring that alignment is preserved through the hub's structural design and mounting configuration.
4Loss of time
If a single threaded shaft and nut system is used to secure the disc, then disc replacement is fast and simple, but the securing mechanism must withstand high operational forces
Solution Approach 1:
The threaded shaft and nut system utilizes optimized thread parameters (pitch, diameter, thread form) to achieve high securing strength with a single fastener. By carefully selecting and designing the thread geometry and material properties, the system maintains the necessary clamping force and shear strength to withstand operational forces while allowing rapid disc replacement through simple nut removal.
Data Source
AI summary
A jump arm assembly for a tilling machine includes a jump arm and a disc hub assembly. The jump arm has a first end coupled to a frame unit of the tilling machine and a second end opposite the first end. The disc hub assembly includes a an arm end configured to be fixedly secured to the second end of the jump arm, and an opposing disc end. A first plane defined by the arm end of the disc hub assembly is arranged in non-parallel relation with respect to a second plane defined by the disc end of the disc hub assembly.