Towed Implement Hitch Height Adjustment Mechanism
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Solution Overview
Problem
Existing hitch systems for towed implements, such as round balers, often lack fine-tuned height adjustment capabilities, typically providing height adjustments in large increments of 7 to 10°, which can be inadequate for certain applications requiring more precise control.
Innovation Solution
A hitch system with a cam-shaped stop key and tooth mechanism that locks into specific notches on the hitch frame, allowing for incremental height adjustments of the hitch frame relative to the main frame, enabling both large and small incremental adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional index ring with axial teeth is used for hitch height adjustment, then the hitch height can be adjusted in discrete steps, but the adjustment increment is large (7-10°) and insufficient for applications requiring fine-tuned control
Solution Approach 1:
The adjustment mechanism is segmented into two independent systems: a coarse adjustment system using multiple hitch mounting holes for large height changes, and a fine adjustment system using the cam-shaped stop key with notches for precise incremental adjustments. This segmentation allows each subsystem to optimize for its specific adjustment range without compromising the other.
Solution Approach 2:
The stop key incorporates a cam-shaped profile that enables dynamic adjustment characteristics. As the stop key rotates within the chamber, the cam surface provides varying radial distance from the pivot axis, creating different leverage effects that facilitate both initial engagement and precise positioning. The cam mechanism transforms rotational motion into controlled linear displacement for fine height adjustments.
2Adaptability or versatility
If the hitch frame is made pivotable relative to the main frame, then height adjustment capability is provided, but the system lacks fine control over the adjustment increments
Solution Approach 1:
The stop key acts as an intermediary mechanism between the pivotable hitch frame and the main frame. It mediates the adjustment process by engaging with specific notches in the hitch frame chamber, translating the continuous rotational freedom of the pivotable hitch into discrete, precisely controlled angular positions. This intermediary component enables fine control without restricting the overall adaptability of the pivotable system.
3Length of moving object
If multiple hitch mounting holes are provided for coarse adjustment, then large height changes can be achieved, but fine-tuned adjustment within each mounting position is not possible
Solution Approach 1:
The adjustment system is divided into two hierarchical levels: coarse adjustment through selection of different hitch mounting holes (providing large height range), and fine adjustment through rotation of the stop key within the chamber (providing precise positioning within each mounting position). This segmented approach resolves the contradiction by addressing both requirements at different levels of the adjustment hierarchy.
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
Enables precise control over hitch height, allowing for better crop material pickup by adjusting the pitch of the baler, providing multiple hitch positions for coarse adjustments and fine-tuned settings within those positions.
Implementation Method 1
The stop key has a cam shaped profile and a tooth which locks into a selected notch to thereby adjust the hitch height of the implement
Data Source
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AI summary
A towed implement (10) for use with a work machine includes a main frame (12) having a pivot hole (32) and at least one hitch mounting hole (34). A hitch frame (18) is coupled with the main frame (12) and includes a towed end (22). A height adjustment arrangement (20, 70, 80) is associated with the main frame (12) and the hitch frame (18) for adjusting a height of the hitch frame (18). The implement (10) is characterized in that the hitch frame (18) is pivotable relative to the main frame (12) about a pivot axis (A) at the pivot hole (32). The hitch frame (18) includes a chamber (40, 90) having an interior periphery (42) with a plurality of notches (44) spaced about the interior periphery (42). The height adjustment arrangement (20, 70, 80) includes a stop key (46) positioned within the chamber (40, 90) of the hitch frame (18). The stop key (46) has a hole (48) arranged for receiving a fastener associated with the at least one hitch mounting hole (34), a cam surface (52), and at least one tooth (54) extending from the cam surface (52). Each tooth (54) is received in a corresponding notch (44) of the interior periphery (42).