Cutting Tool Clutch for Selective Knife Actuation
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Solution Overview
Problem
Existing cutting units for combine harvesters face challenges in flexibility and efficiency, particularly when dealing with heavily intertwined crops, leading to harvest losses and requiring time-consuming adjustments for different harvesting conditions.
Innovation Solution
The cutting unit incorporates a clutch system actuated by an actuator, allowing for the selective switching on or off of cutting knives during operation, enabling adaptable harvesting and reducing the need for frequent mounting and dismantling of separating knives, with a separable mechanical drive train and optional hydraulic or electromechanical actuation for enhanced control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separating knives are mounted on the cutting unit to handle heavily intertwined crops, then harvest losses are reduced, but the time required for mounting and dismantling the separating knives increases when changing between fields with different harvesting conditions
Solution Approach 1:
The patent applies the dynamics principle by making the separating knives dynamically controllable through a clutch mechanism. The separating knives can be switched on or off during operation based on harvesting conditions, eliminating the need for manual mounting and dismantling when changing between different crop types. This dynamic control resolves the contradiction by maintaining the ability to handle intertwined crops when needed while avoiding the time loss associated with physical reconfiguration.
Solution Approach 2:
The clutch mechanism enables the separating knives to be self-activated or deactivated through the existing drive system without requiring external intervention for mounting or dismantling. The system serves itself by automatically engaging or disengaging the separating knives based on operational requirements, thus eliminating the manual labor and time associated with physical installation and removal.
2Productivity
If the cutting unit operates with permanently driven mowing blades to ensure continuous cutting capability, then productivity is maintained, but safety is reduced due to the inability to switch off individual cutting knives when not needed
Solution Approach 1:
The patent applies segmentation by dividing the drive system into independent controllable segments. Each separating knife has its own clutch mechanism that can be independently engaged or disengaged from the drive train. This allows the main mowing blades to continue operating continuously for productivity while individual separating knives can be switched off when not needed, thereby maintaining safety without sacrificing productivity.
Solution Approach 2:
The dynamic clutch mechanism allows the cutting unit to adapt its configuration during operation. The separating knives can be dynamically engaged when handling intertwined crops and disengaged when operating on standard crops or at field edges, maintaining both continuous productivity and operational safety through real-time control.
3Adaptability or versatility
If a separable mechanical drive train is used to drive the cutting knives to enable flexible switching, then adaptability is improved, but device complexity increases
Solution Approach 1:
The clutch mechanism serves multiple functions: it enables the separating knives to be engaged or disengaged, provides overload protection, and can be controlled through existing hydraulic or electromechanical systems. This multi-functionality justifies the added complexity by providing adaptability without requiring separate control systems for each function.
Solution Approach 2:
The clutch acts as an intermediary element between the continuous drive train and the separable cutting knives. It mediates the power transmission, allowing smooth engagement and disengagement without requiring complex coupling mechanisms. The clutch simplifies the overall system by providing a standardized interface for controlling the separable knives.
Data Source
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AI summary
The present invention relates to a cutting unit (1) comprising a frame (2) on which a horizontally extending mowing device (4) extending substantially across the width of the cutting unit (1) is arranged, the mowing device having mowing blades (5) arranged on at least one cutter bar (5a), wherein at least one gearbox (14) is arranged at the end of the frame (2) to drive the mowing device (4), which converts a rotational movement of a drive shaft (15) arranged on the cutting unit (1) into an oscillating translational movement of the mowing blades (5), and separating blades (7) which are detachably attached at each end of the frame (2) and which extend substantially vertically to the mowing device (4), at least one of which is driven by a separable mechanical drive train (11, 30), wherein a clutch (18) is arranged in at least one drive train (11, 30).which can be actuated during the operation of the cutting unit (1) by at least one actuator (23) in order to switch on or off at least one separating knife (7).