Header Height Linkage Assembly With Low-Stress Flex Arm Lockout
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Solution Overview
Problem
Existing header height control systems for agricultural harvesters face stress issues due to the specific lockout methods, downstops, and feeler-flex arm sliding profiles, which are complex and subject the flex arms to significant mechanical stress.
Innovation Solution
The system incorporates a linkage assembly with pivotable links and a control shaft, allowing the flex arm to move between height positions, featuring a tab for engaging the linkage assembly and a sensor for rotational orientation sensing, along with a lockout mechanism using apertures and fasteners to reduce stress and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a combination of flex arms, feelers, and rotatable control shaft is used for header height control, then the cutting mechanism can track the ground, but the system subjects the flex arm to significant amounts of stress
Solution Approach 1:
The patent removes the feeler component from the system entirely, replacing it with a direct linkage assembly that connects the control shaft to the flex arm. This extraction of the problematic feeler element eliminates the source of significant stress while maintaining the ground tracking function through the simplified linkage mechanism.
Solution Approach 2:
The patent introduces a linkage assembly as an intermediary component between the control shaft and the flex arm. This linkage assembly includes a link with a slot that receives the control shaft tab, creating a new mechanical interface that reduces stress transmission to the flex arm while still enabling height control functionality.
2Reliability
If specific lockout methods and downstops are implemented in the header height control system, then the system can maintain position, but the device complexity increases
Solution Approach 1:
The patent combines the lockout function and downstop function into the linkage assembly itself. The link with the slot serves both as a position control element and as a locking mechanism, eliminating the need for separate, complex lockout devices and downstops.
Solution Approach 2:
The linkage assembly is designed to perform multiple functions: it controls header height, provides locking capability through the slot-tab engagement, and acts as a downstop. This multi-functionality reduces the overall number of components and simplifies the system while maintaining position stability.
3Ease of operation
If feelers slidably engage the flex arms with a specific sliding profile, then the control shaft can rotate smoothly, but the manufacturing precision requirements increase
Solution Approach 1:
The patent eliminates the feeler component that required the complex sliding profile, replacing it with a linkage assembly that uses a slot-tab connection. This removes the need for high-precision sliding surfaces while maintaining smooth control shaft rotation through the slot-guided movement.
Solution Approach 2:
The patent changes the mechanical interaction from a sliding contact (requiring precise surface profiles) to a slot-based guided movement. This parameter change in the engagement mechanism reduces manufacturing precision requirements while maintaining operational smoothness.
Data Source
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AI summary
An agricultural harvester is disclosed. The agricultural harvester comprises a header. The header includes a frame, a control shaft connected to the frame, a flex arm, a linkage assembly and a cutter bar connected to the flex arm. The linkage assembly is movable between a first position and a second position. The linkage assembly includes a first end pivotably connected to the control shaft and a second end connected to the flex arm.