Variable Speed Coupling for Auger Drive Torque Management
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Solution Overview
Problem
The existing drive systems for unloading grain from combine harvesters face challenges in start-up, requiring additional power to overcome inertia and often not utilizing excess power available from the power plant to increase unloading rate.
Innovation Solution
A variable speed coupling system that adjusts the drive ratio of cross augers to manage power efficiently, allowing low-speed start-up and higher speeds when more power is available, with an optional clutch for selective engagement and disengagement of cross augers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a common drive system is used for cross augers and discharge augers, then space and weight requirements are reduced, but excessive torque is required during start-up to overcome inertia
Solution Approach 1:
The patent applies a variable speed coupling mechanism that dynamically adjusts the drive ratio between the main drive shaft and cross augers. During start-up, the coupling provides a higher drive ratio to reduce the torque required to overcome inertia. Once the augers are rotating, the drive ratio is adjusted to optimize power transmission. This dynamic adjustment resolves the contradiction by allowing the same compact common drive system to accommodate both low-torque start-up and high-power operation phases.
2Device complexity
If a common drive system is used for cross augers and discharge augers, then the system structure is simplified, but excess power from the power plant cannot be utilized to increase unloading rate
Solution Approach 1:
The variable speed coupling enables dynamic adjustment of the cross auger rotation speed based on available power from the power plant. When excess power is available, the coupling allows the cross augers to rotate at higher speeds, thereby increasing the unloading rate. This maintains the simplicity of the common drive system structure while enabling flexible optimization of productivity according to power availability.
Solution Approach 2:
The patent changes the operational parameters of the cross augers by varying their rotation speed through the variable speed coupling. This allows the system to adapt to different power availability conditions, utilizing excess power to increase unloading rate when needed, while maintaining structural simplicity of the common drive system.
3Productivity
If high power is provided to the drive system, then unloading rate increases, but excessive torque is required during start-up
Solution Approach 1:
The variable speed coupling provides dynamic control over the power transmission to cross augers, allowing the system to operate at high power levels for increased unloading rate during normal operation, while automatically reducing the torque demand during start-up by providing a higher drive ratio. This resolves the contradiction by separating the torque requirements of different operational phases while maintaining high productivity capability.
Data Source
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AI summary
An unloading system for an agricultural vehicle includes: a grain tank; at least one cross auger placed within the grain tank; a discharge tube having an inlet in communication with the grain tank and at least one discharge auger placed therein; and a drive system configured to drive the at least one cross auger and the at least one discharge auger. The drive system includes: a main driver; a discharge coupling continuously coupled to the main driver and the at least one discharge auger; and a variable speed coupling continuously coupled to the main driver and coupled to the at least one cross auger.