Agricultural Header Arm Assembly Eliminates Pivot Joints
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The complex and time-consuming process of precisely positioning pivot joints in agricultural headers increases manufacturing costs and maintenance, particularly due to wear in bushings used in these joints.
Innovation Solution
An arm assembly for agricultural headers that uses a leaf spring and actuator to support the cutter bar assembly, allowing it to flex and move vertically relative to the frame, eliminating the need for pivot joints and reducing maintenance by absorbing energy from obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pivot joints are used to support the cutter bar assembly, then the arm assembly can be positioned precisely to maintain constant cutting height, but the manufacturing cost and complexity increase due to the need for precise positioning and the maintenance burden from bushing wear
Solution Approach 1:
The patent removes the pivot joint and bushing components from the arm assembly, extracting the problematic elements that caused wear and maintenance issues. The arm assembly is reconfigured to connect directly to the header frame without intermediate pivot joints, eliminating the need for bushings while maintaining the structural integrity and cutting height consistency through direct rigid connection.
Solution Approach 2:
The arm assembly is designed to perform multiple functions: it provides structural support for the cutter bar assembly, maintains precise cutting height positioning, and eliminates the need for separate bushing components by integrating the connection directly into the arm and frame structure. This multi-functional design reduces overall system complexity while achieving the same positioning precision.
2Reliability
If pivot joints with bushings are used in the arm assembly, then the cutter bar assembly can be supported and positioned, but maintenance operations increase due to bushing wear over time
Solution Approach 1:
The patent extracts and removes the bushing component entirely from the arm assembly design. By eliminating the pivot joint that required bushings, the design removes the source of wear-related maintenance issues while maintaining the essential support function through the rigid arm structure connected directly to the header frame.
Solution Approach 2:
The design replaces the wear-prone bushing component with a durable, maintenance-free rigid connection. Instead of using replaceable bushings that wear out and require periodic replacement, the arm assembly uses a permanent structural connection that eliminates recurring maintenance needs.
3Shape
If pivot joints are precisely positioned on the header frame, then the cutter bar assembly maintains a straight configuration, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent removes the pivot joint positioning requirement from the manufacturing process. By eliminating the pivot joint intermediate component, the design allows the arm assembly to be connected directly to the header frame without requiring precise positioning holes or complex alignment procedures, thereby simplifying manufacturing while maintaining cutter bar straightness through proper arm geometry design.
Solution Approach 2:
Instead of positioning pivot joints precisely on the frame and then attaching arms, the design inverts the approach by directly attaching the arm assembly to the frame at predetermined locations. The straightness of the cutter bar is achieved through the geometric design of the arm connections rather than through precise pivot joint positioning, reversing the traditional manufacturing sequence and simplifying the process.
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 simplifies the positioning of arm assemblies, reduces manufacturing costs, and minimizes maintenance by eliminating the need for pivot joints and their associated bushings, while maintaining a constant cutting height and flexibility to follow field contours.
Implementation Method 1
a leaf spring configured to couple to a frame of the agricultural header... the arm assembly is configured to be coupled to the frame only by the leaf spring and the actuator
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An arm assembly of an agricultural header includes a leaf spring configured to couple to a frame of the agricultural header. The arm assembly also includes an arm coupled to the leaf spring, in which the arm is configured to support a cutter bar assembly of the agricultural header. In addition, the arm assembly includes an actuator coupled to the arm and configured to couple to the frame of the agricultural header. The actuator is configured to urge the arm to move the cutter bar assembly upwardly relative to a soil surface, and the arm assembly is configured to be coupled to the frame only by the leaf spring and the actuator.