Combine Harvester Grate Flaps to Prevent Material Accumulation

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Solution Overview

Problem

Existing crop processing systems in combine harvesters face inefficiencies due to material accumulation in grate assemblies, leading to reduced efficiency and increased operating costs.

Innovation Solution

A grate assembly with pivotable flaps and a movable linkage system that reduces material accumulation by allowing flaps to pivot over an angular range, minimizing collection points and enhancing the flow of crop material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If fixed flaps are used in the grate assembly, then structural simplicity is maintained, but material accumulation occurs reducing processing efficiency

Engineering Contradiction:

Improvecrop processing efficiencyVSAvoidgrate assembly structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies the dynamics principle by transforming the fixed flaps into pivotable flaps that can dynamically adjust their position. The flaps are coupled to a movable linkage system that allows them to pivot between different angular positions, enabling the grate assembly to adapt its configuration during operation to prevent material accumulation while maintaining structural integrity

Inventive Principle:

Principle #15Dynamics

2Productivity

If pivotable flaps with movable linkage are implemented, then material accumulation is reduced improving efficiency, but device complexity increases

Engineering Contradiction:

Improvecrop processing efficiencyVSAvoidgrate assembly structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The grate assembly is segmented into multiple independent pivotable flaps rather than a single fixed structure. Each flap can be individually controlled by the movable linkage system, allowing selective adjustment of different sections of the grate to optimize material flow while maintaining overall structural coherence

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The movable linkage system serves multiple functions: it couples multiple flaps together, enables individual flap pivoting, maintains relative positioning between flaps, and allows the entire assembly to adapt to varying operating conditions. This multi-functionality reduces the need for separate mechanisms for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If flaps are made fully movable to prevent material accumulation, then processing smoothness is improved, but control precision becomes more difficult

Engineering Contradiction:

Improvematerial flow smoothnessVSAvoidflap position control

Core Design Contradiction:

Ease of operationVSDifficulty of detecting and measuring

Solution Approach 1:

The movable linkage system maintains equipotential relationships between connected flaps through mechanical coupling. The linkage ensures that flaps move in a coordinated manner, maintaining proper relative positioning and angular relationships throughout the range of motion, which simplifies control compared to fully independent movable flaps

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentUS12490679B2Combine harvester separation system

Publication Date: 2025.12.09 DEERE & CO

AI summary

Combine harvesters may include crop processing systems having a grate subassemblies with flaps that, in some instances, are divided into groups that are independently movable and moveable in opposite directions between a fully open position and a fully closed position. Further, each of the grate assemblies may include an actuator that is operable to actuate simultaneously a portion of the flaps on each of the grate assemblies.