Variable Track Width Mechanism for Agricultural Machines
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Solution Overview
Problem
Agricultural application machines with fixed track widths face limitations in flexibility, leading to crop damage and reduced output when operating on fields with varying tram line widths, as they cannot adjust their track width to match different tram line configurations, necessitating multiple contractors and increased operational inefficiencies.
Innovation Solution
The implementation of a variable track width mechanism using slidably mounted bearing blocks and hydraulic actuators allows for adjustable wheel separation, minimizing friction and reducing the number of components, enabling the machine to adapt to different tram line widths with ease and reduced maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed track width machine is used, then the structure is simple, but the adaptability to different tram line widths is poor
Solution Approach 1:
The patent implements a dynamic track width adjustment mechanism where the wheel support structure can change its transverse separation distance. The support legs are designed to be movable relative to the chassis, allowing the track width to be adjusted from a first distance to a second distance. This dynamic capability enables the machine to adapt to different tram line widths while maintaining operational stability through the pivotable connection between support legs and wheel assemblies.
2Ease of operation
If traditional track width adjustment mechanisms are used, then the track width can be varied, but the frictional resistance is high
Solution Approach 1:
The patent employs a hydraulic actuator to drive the track width adjustment mechanism. The hydraulic cylinder connects the wheel support structure to the chassis and provides powered movement of the support legs relative to the chassis. This hydraulic actuation system overcomes high frictional resistance in the pivot joints and sliding surfaces, enabling smooth and easy track width adjustment without excessive manual force requirements.
3Adaptability or versatility
If multiple components are used for track width adjustment, then the adjustment capability is achieved, but the manufacturing cost and maintenance cost increase
Solution Approach 1:
The patent designs the support legs to serve multiple functions: they provide structural support for the wheels, enable track width adjustment through relative movement, and connect the wheel assembly to the chassis via pivotable joints. The hydraulic cylinder also serves dual purposes by both actuating the adjustment mechanism and providing structural linkage. This multi-functionality reduces the total number of separate components needed, thereby lowering manufacturing and maintenance costs.
Solution Approach 2:
The patent merges the support leg and wheel assembly into an integrated unit where the support leg is pivotally connected to both the chassis and the wheel assembly. This combined structure eliminates the need for separate mounting brackets, connection plates, and fastening mechanisms that would otherwise be required. The hydraulic cylinder is also integrated directly into the support leg structure, further reducing component count and simplifying the overall adjustment mechanism.
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 solution provides greater flexibility and reduces crop damage by allowing the machine to operate on various tram line widths, increasing operational efficiency and reducing the need for multiple contractors, while maintaining a rigid structure and minimizing turning circles.
Implementation Method 1
During adjustment of the track width the sliding friction is only exerted between the bearing block sleeve and the transverse support shaft. Using known bearing technology this sliding friction is significantly reduced
Implementation Method 2
the application machine may further comprise a respective hydraulic actuator connected between each wheel support structure and the chassis to apply a force therebetween to assist in varying the transverse separation of the wheels
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An agricultural application machine (10) comprising a pair of wheels (11,12) each having an associated wheel support structure (22) is provided. Each wheel support structure is mounted to the chassis (60) by a transversely extending support shaft (29;49) which is slidably mounted within a bearing block (27;47). The provision of bearing blocks allows the transverse separation of the wheels to be varied with minimal sliding friction.