Pivotable Drawbar and Chassis for Merger Turning Circle
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Solution Overview
Problem
Existing agricultural harvesting apparatuses, such as mergers or pickup swathers, face difficulties in achieving a small turning circle in headland and transport positions, which is essential for efficient maneuverability.
Innovation Solution
The harvesting apparatus features a pivotable drawbar and chassis relative to the supporting frame, enabled by actuators, allowing for a reduced turning circle without a complex control system. The drawbar and chassis can be independently or coordinately actuated to adapt to different positions, improving crop transfer and maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drawbar is fixed relative to the supporting frame, then the structure is simple and stable, but the turning circle is large in headland and transport positions
Solution Approach 1:
The drawbar is made pivotable relative to the supporting frame about a pivot axis, allowing it to dynamically change orientation between working position and headland/transport positions. This dynamic adjustment enables a smaller turning circle while maintaining structural simplicity through a single degree of freedom pivot mechanism rather than complex multi-axis articulation.
2Ease of operation
If the chassis is fixed relative to the supporting frame, then the structure is stable, but the turning circle cannot be reduced further
Solution Approach 1:
The chassis is made pivotable relative to the supporting frame about a pivot axis, enabling dynamic repositioning during headland turns and transport. This additional degree of freedom works in conjunction with the drawbar pivoting to achieve minimal turning circle, while the pivot-based mechanism keeps the added complexity manageable through standardized articulation points.
3Ease of operation
If actuators are added to control drawbar and chassis pivoting, then the turning circle is reduced, but the control system becomes complex
Solution Approach 1:
The pivoting mechanism is designed to operate with minimal active control, allowing the drawbar and chassis to be repositioned through passive mechanical advantage and operator input alone. The actuators serve only to initiate or assist the pivoting motion rather than providing continuous active control, thereby reducing the extent of automation while achieving the desired maneuverability.
4Ease of operation
If the drawbar and chassis are both pivotable, then the turning circle is minimized, but the device complexity increases
Solution Approach 1:
The maneuverability function is segmented into two independent pivot actions: drawbar pivoting relative to the supporting frame, and chassis pivoting relative to the supporting frame. This segmentation allows each component to be optimized independently and simplifies the overall control logic, as the two pivoting actions can be performed sequentially or independently rather than requiring coordinated multi-axis control.
Data Source
AI summary
A merger, with a supporting frame having a longitudinal member and crossmembers, with a wheeled chassis, with a drawbar engaging the supporting frame and via which the merger couples to a tractor, with pickup members for picking up crop, wherein one pickup member is accommodated on a first side of the longitudinal member and another pickup member is accommodated on a second side of the longitudinal member, in each case on a crossmember, with belt conveyors for conveying picked-up crop in a transverse conveying direction running transversely with respect to a longitudinal direction, wherein at least one belt conveyor is accommodated on a first side of the longitudinal member and another belt conveyor is accommodated on a second side of the longitudinal member, on the respective crossmember, wherein the drawbar pivots relative to the supporting frame for transferring the merger between a working position to headland or transport position.