Adjustable Gauge Wheels for Combine Header Stability
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Solution Overview
Problem
Existing combine harvester headers face stability issues when cutting at raised heights and higher speeds, particularly due to inadequate support from gauge wheels with soft or stiff springs, and ground sensors that react too slowly to provide necessary control and stability.
Innovation Solution
A combine harvester design featuring spring arms with ground engaging gauge wheels and an automatic header height control system, utilizing float distance sensors and adjustable links to maintain a set float distance, allowing the header to adjust weight distribution between the feeder house and gauge wheels, ensuring stability and even cutting height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gauge wheels with soft springs are used, then the header can absorb shock loads when hitting bumps, but the header stability is insufficient when cutting at raised heights and higher speeds
Solution Approach 1:
The gauge wheel assembly is made adjustable rather than fixed, allowing the operator to change the gauge wheel position relative to the header to optimize performance for different cutting conditions. This dynamic adjustment capability enables the system to adapt between shock absorption needs and stability requirements.
Solution Approach 2:
The position of the gauge wheel on the header is made variable through adjustable links, allowing changes in the geometric parameters of the gauge wheel assembly. This enables optimization of both shock absorption and stability by adjusting the gauge wheel position according to operating conditions.
2Stability of the object's composition
If gauge wheels with stiff springs are used, then header stability is improved, but the stiff spring action throws the header up to an unacceptable degree when hitting bumps
Solution Approach 1:
The adjustable gauge wheel position allows the system to dynamically adapt its characteristics. By positioning the gauge wheel optimally on the header, the system achieves stability without excessive uplift, as the adjustable configuration enables fine-tuning of the mechanical leverage and spring engagement.
Solution Approach 2:
Changing the position parameter of the gauge wheel on the header modifies the mechanical advantage and spring compression characteristics. This parameter adjustment allows achieving adequate stability while reducing the harmful uplift effect by optimizing the gauge wheel location.
3Stability of the object's composition
If gauge wheels are mounted solid on the header, then header stability is maximized, but the cutter bar height cannot be adjusted while maintaining ground contact and huge shock loads occur
Solution Approach 1:
The gauge wheel mounting is made adjustable through movable links rather than fixed solid mounting. This allows the gauge wheel position to be changed relative to the header, enabling height adjustment capability while maintaining ground contact stability during operation.
Solution Approach 2:
The connection between the gauge wheel and header is segmented into adjustable links rather than a solid rigid connection. This segmentation allows independent adjustment of the gauge wheel position while maintaining the structural integrity and stability of the header assembly.
4Extent of automation
If ground sensors are used instead of gauge wheels, then direct control signals are provided to the suspension system, but the system reacts too slowly and the header oscillates when the combine goes over bumps
Solution Approach 1:
The patent replaces electronic ground sensors with a mechanical gauge wheel system that provides immediate mechanical feedback and control. The gauge wheels directly contact the ground and mechanically link to the header suspension, providing instantaneous response without electronic signal processing delays.
Solution Approach 2:
The gauge wheel system is self-regulating through direct mechanical contact with the ground. The gauge wheels automatically adjust the header height by physically engaging the ground and mechanically transmitting forces, eliminating the need for external sensors and control systems.
5Stability of the object's composition
If the header is positioned on a bottom stop when cutting off the ground, then the header is fixed relative to the combine, but oscillation of the combine causes the header to move up and down causing irregular cut
Solution Approach 1:
The gauge wheels act as intermediaries between the ground and the header suspension system. They provide a mechanical reference to ground height while allowing the header to maintain its position relative to the combine, absorbing the oscillations and preventing them from transmitting to the cutter bar.
Solution Approach 2:
The header suspension is made dynamically adjustable through the movable gauge wheels, allowing the system to adapt to ground oscillations. The adjustable links enable the header to maintain stable cutting height by compensating for combine oscillations through mechanical adjustment.
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
The solution provides enhanced stability and adjustable cutting height without excessive gauge wheel weight, allowing the header to smoothly follow ground contours and maintain a consistent cut height over uneven terrain.
Implementation Method 1
each suspension arm having a respective mechanical spring to allow movement of the header at least upwardly and downwardly relative to the adapter
Implementation Method 2
there is provided a float distance sensor (39) for sensing changes in a float distance relative to the bottom stop (38) of the adapter of the header
Data Source
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AI summary
A header assembly for a combine harvester includes a header carried by an adapter on the feeder house of the combine and on a pair of gauge wheel which can be adjusted from inside the cab to change height of the cutter bar from the ground. This is used in combination with an Automatic Header Height Control so that the main suspension is adjusted to carry approximately 90% of the header weight, the header is dropped on the ground until the gauge wheels contact the ground, and causes the header to "float" with respect to the main carrier frame and the AHHC is set so that the combine feeder house stops lowering when a pre-set amount of header to adapter separation (float) is achieved with the AHHC operating to maintain this set amount by controlling the height of the feeder house.