Concentric Connecting Bolt Clutch for Chopping Drum
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Solution Overview
Problem
Existing drive connections for chopping drums in harvesting machines require complex and costly adjustments, often leading to mechanical stress and potential failure due to the use of multiple screws and bolts subjected to bending stresses, which complicates the tuning and maintenance of the chopping device.
Innovation Solution
A drive connection featuring a clutch arrangement with oppositely threaded connecting bolts and a pressure plate, allowing for axial release or engagement of the clutch from outside the housing, minimizing maintenance costs and reducing bending stresses on the connecting bolts by eliminating lever arms and radial projections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple connecting bolts and screws are used to provide non-positive connection for the clutch arrangement, then the clutch can be released from outside the gear unit, but the connecting elements are subjected to high alternating bending stresses leading to fracture
Solution Approach 1:
The invention extracts the harmful lever arm and radial projection elements from the connecting bolt design. The connecting bolt is designed without radial projections or lever arms that would create bending moments, eliminating the source of alternating bending stresses that cause fracture while maintaining the ability to release the clutch from outside the gear unit.
Solution Approach 2:
Instead of using multiple bolts arranged in a radius pattern (conventional approach), the invention uses a single connecting bolt arranged concentrically to the drive shaft. This inverts the conventional design philosophy by eliminating the radial arrangement that causes bending stresses, thereby improving reliability while maintaining operational accessibility.
2Adaptability or versatility
If a releasable flange connection or screw connection is used between the drive wheel and chopping drum, then the chopping drum position can be adjusted, but the adjustment requires opening the gear unit housing involving mounting cost and time loss
Solution Approach 1:
The clutch arrangement is designed to be self-servicing in terms of adjustment accessibility. The connecting bolt can be operated from outside the gear unit housing without requiring disassembly or opening of the housing, allowing operators to perform adjustments and maintenance independently without incurring additional mounting costs or time loss.
3Ease of manufacture
If connecting bolts with screw heads and radial projections are used, then the clutch arrangement can be assembled, but the distance from screw head to shank creates additional points of application for alternating stresses
Solution Approach 1:
The invention removes the harmful features of radial projections and extended screw heads from the connecting bolt design. By extracting these elements, the design eliminates additional stress concentration points while maintaining sufficient assembly capability through the simplified concentric connecting bolt configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration simplifies the adjustment and maintenance of the chopping device, reducing the risk of mechanical failure and maintaining the non-positive connection with minimal parts and maintenance costs, while preventing bending stress-induced fractures.
Implementation Method 1
which is able to be brought into a frictional connection by a pressure plate arranged on a shaft end region of the drive shaft and acting on the clutch disk unit
Data Source
AI summary
A drive connection couples a drive wheel to a drive shaft at the end of a chopping drum through a clutch arrangement including a clutch disk unit having clutch disks on the drive wheel side and clutch disks on the drive shaft side, the disks being frictionally engaged with each other by a pressure plate arranged on a drive shaft end region and acting on the clutch disk unit, and a connecting bolt arranged concentrically to the drive shaft. Formed on the connecting bolt is a first external thread located for being brought into engagement with a first threaded bore provided in the pressure plate, and a second external thread for being brought into engagement with a second threaded bore provided in the shaft end region, wherein the first and second external threads and the first and second threaded bores have thread directions configured to oppose one another.