Side Cutting Unit Overload Clutch and Drive Segmentation
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Solution Overview
Problem
Existing side cutting units in combine harvesters face issues with high loads on force-transmitting elements, wear, and increased vibration due to long power transmission paths, leading to potential overload damage on the gearbox during harvesting of intertwined crops like rapeseed.
Innovation Solution
A side cutting unit design featuring a drive device with a first clutch connected to an output shaft and a second, backlash-free overload clutch to protect driven components, along with a quick coupling mechanism and lubrication system to ensure precise overload behavior and easy assembly, and a support frame with a retaining cam for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If coupling rods engage centrally on cutting blades to transmit forces, then force transmission is achieved, but wear increases and vibration increases due to long power transmission paths
Solution Approach 1:
The power transmission system is segmented into modular components: a drive device with clutch elements, coupling rods, and cutting blades. This segmentation allows for shorter, more direct power transmission paths while maintaining force transmission capability, thereby reducing wear and vibration in the force-transmitting elements.
2Ease of operation
If a single positive coupling connects the side cutter drive device to the cutter bar, then connection is achieved, but overload damage can affect the gearbox
Solution Approach 1:
An overload clutch is integrated into the drive device to provide beforehand cushioning against overloads. This clutch element is designed to slip or disengage when excessive forces are applied, protecting the gearbox and other driven components from damage while maintaining easy connection through the clutch mechanism.
3Force
If long power transmission paths are used in the side cutting unit, then force transmission is achieved, but vibration behavior increases
Solution Approach 1:
The invention extracts and eliminates unnecessary intermediate transmission elements to shorten the power transmission path. By directly coupling the drive device to the cutting blades through optimized clutch and coupling mechanisms, the system achieves force transmission with reduced vibration and improved dynamic performance.
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The present invention relates to a cutting unit (1) comprising a frame (2) and a cutting unit trough arranged thereon, a cutting table arranged upstream of the cutting unit trough with a cutter bar (3) arranged thereon and driven in an oscillating manner by at least one drive (9), a rotaryally driven reel which is guided on the cutting unit trough by means of support arms and is adjustable relative to it in or against a mowing direction, and at least one side cutting unit (4) detachably arranged at its end on the frame (2), which extends substantially vertically to the cutter bar (3), wherein the side cutting unit (4) comprises a beam rail (6) arranged on a support frame (5), wherein the beam rail (6) supports at least one oscillatingly driven separating knife (7) in the longitudinal direction by means of knife holding devices (8) and is connected at one end to a drive mechanism that effects the oscillating drive movement of the at least one separating knife (7).The output (9) connected to the cutter bar (3) is coupled by a drive device (10), the drive device (10) having a first clutch (23) for connection with an output shaft (22) of the output (9) and a second clutch (26), designed as an overload clutch, which connects the first clutch (23) to a drive shaft (29) for driving the at least one separating knife (7).