Variable-Speed Reel Drive Layout for Wide Harvester Headers
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Solution Overview
Problem
Conventional agricultural harvester headers with reels driven by motors at the outer ends suffer from increased width without enhanced cutting efficiency, and struggle to accommodate both low-speed high-torque and high-speed low-torque operations effectively.
Innovation Solution
A variable speed reel drive system is introduced, featuring a variable speed motor, multi-speed gearbox, continuously variable transmission, or planetary gear drive, located between adjacent reels to control rotational velocity and maintain effective cutting width without increasing header width, enabling adaptable torque and speed adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If motors and driving mechanisms are located at the outer ends of the reels, then the reels can be driven, but the overall header width increases without increasing the effective cutting width
Solution Approach 1:
The patent combines the driving mechanisms for multiple reels into a single centralized location between the reels. Instead of having separate motors at each outer end, a single motor with a multi-speed gearbox drives both reels through a common drive shaft system, merging the driving functions into one location that does not increase header width.
Solution Approach 2:
The drive mechanism is repositioned from the lateral dimension (outer ends of reels) to the longitudinal dimension (between reels along the cutting path). This dimensional shift allows the driving mechanism to be accommodated within the existing header width while still providing effective reel drive capability.
2Device complexity
If a conventional hydraulic motor is used, then the system is simple, but it cannot accommodate both low-speed high-torque and high-speed low-torque operations effectively
Solution Approach 1:
The patent employs a multi-speed gearbox that allows the system to dynamically switch between different speed-torque ratios. The gearbox provides multiple gear ratios that can be selected based on operational requirements, enabling the system to adapt between low-speed high-torque and high-speed low-torque operations.
Solution Approach 2:
The system changes the mechanical transmission ratio parameter through the multi-speed gearbox to accommodate different operational conditions. By providing multiple fixed gear ratios, the system can optimize the speed-torque characteristics for different crop conditions and cutting requirements.
Data Source
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AI summary
An agricultural harvester header including a first reel, a second reel adjacent the first reel, and a variable speed reel drive between the first and second reels and operatively connected to at least one of the first reel for rotatably driving the first reel and the second reel for rotatably driving the second reel. The variable speed reel drive can include: a variable speed motor, and a multi-speed gearbox operatively coupled to the variable speed motor and at least one of the reels; a motor, and a continuously variable transmission operatively connected to the motor and at least one of the reels; or a motor, and a planetary gear drive operatively coupled to the motor and at least one of the reels.