Steerable Walking Tandem Axles for Header Transport Maneuverability
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Solution Overview
Problem
Towed farm implements, such as header transports, face difficulties in maneuverability due to limited steering range, leading to tire damage and stress on the transporter frame, especially when navigating sharp angles or uneven terrain.
Innovation Solution
A header transport steering system with steerable walking tandem axles that provides independent oscillation of each axle, allowing all wheels to maintain constant contact with the ground and enabling tighter turns through a mechanical linkage system from the tow hitch, eliminating the need for special equipment or manual control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional tongue pivot steering system is used, then the structure is simple, but the steering range is limited and maneuverability is poor
Solution Approach 1:
The steering system is divided into multiple independent segments: a front steering axle and multiple rear walking tandem axles, each capable of independent oscillation. This segmentation allows each axle to steer independently, dramatically increasing the overall steering range and maneuverability beyond what a single tongue pivot can achieve.
Solution Approach 2:
The system transitions from a static tongue pivot mechanism to a dynamic system where multiple axles can oscillate independently in real-time. The walking tandem axles can move dynamically to accommodate terrain variations and steering inputs, providing continuous adjustment of the vehicle's steering characteristics throughout the maneuver.
2Reliability
If the tongue pivot angle is limited, then the structure remains simple, but tire damage and stress on the frame increase during sharp turns
Solution Approach 1:
By segmenting the steering function across multiple independent axles, each axle can handle a portion of the steering load. This distribution reduces the stress concentration on any single component during sharp turns, thereby improving tire durability and frame reliability without requiring overly complex linkages.
Solution Approach 2:
The system changes the steering parameters by allowing multiple axles to oscillate independently rather than relying on a single tongue pivot angle. This parameter change enables the vehicle to achieve sharp turns through coordinated axle movement, reducing the mechanical stress on tires and frame while maintaining structural simplicity.
3Ease of operation
If walking tandem axles are added to increase steering range, then maneuverability improves, but the device complexity increases
Solution Approach 1:
The walking tandem axles serve multiple functions simultaneously: they provide steering capability, maintain wheel contact with uneven terrain, and support the vehicle's weight. This multi-functionality increases the steering range and maneuverability without proportionally increasing complexity, as the same components perform multiple roles.
Solution Approach 2:
The walking tandem axles are designed to self-adjust and oscillate independently based on terrain conditions and steering inputs, without requiring complex external control mechanisms. Each axle serves itself by automatically adapting to terrain variations and providing necessary steering functions, thereby reducing the overall system complexity despite the added capability.
4Strength
If all wheels are made steerable, then load-bearing capacity increases, but the steering control system becomes more complex
Solution Approach 1:
The steerable wheel system is segmented into independent axle units, each with its own oscillation capability. This segmentation allows the load-bearing function to be distributed across multiple independent units rather than requiring a single complex control system to manage all wheels, thereby maintaining simplicity while achieving high load-bearing capacity.
Data Source
AI summary
A header transport steering system is provided that allows the tongue of the header transport to pivot and translates the movement of the tongue to all of the wheels of the header transport. Front steering linkages are coupled to the tongue, and are configured to oscillate front wheels in response to rotation of the tongue. Walking tandem beams are connected to the frame and are configured to rotate in height with respect to the frame.