Agricultural Header Driveline Torque Limiter and Flywheel Integration
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Solution Overview
Problem
Traditional combine harvester drivelines are complex and lack a straightforward alternative for efficiently managing the reciprocating motion of knives, particularly in configurations with overload protection and telescopic shafts.
Innovation Solution
A driveline arrangement featuring a transverse drive shaft, bevel gearbox, lateral drive shaft, and a torque limiter with a clutch mechanism, which stabilizes the rotation and includes a flywheel to counteract vibrations, allowing for efficient and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional belt or chain transmission with a wobble box is used to drive reciprocating knives, then the driveline configuration is straightforward, but the device complexity increases and operational efficiency decreases
Solution Approach 1:
The patent replaces the traditional belt or chain transmission system with a gear-based transmission system. Specifically, a first gear on the transverse drive shaft engages with a second gear on the lateral drive shaft, providing more efficient mechanical power transmission and reducing driveline complexity while improving operational efficiency
Solution Approach 2:
The patent introduces a torque limiter as an intermediary component between the bevel gearbox and the transmission system. This torque limiter includes a clutch mechanism that automatically engages or disengages based on torque conditions, protecting the system from overload while simplifying the overall driveline configuration
2Adaptability or versatility
If a telescopic shaft is used to enable cutterbar movement for varying header table length, then the adaptability improves, but the device complexity increases due to the need for overload clutch mechanisms
Solution Approach 1:
The patent employs a telescopic lateral drive shaft that can dynamically adjust its length. The shaft includes nested segments that can extend or retract, allowing the cutterbar to move forward and backward for varying the header table length while maintaining a relatively simple driveline configuration without complex overload clutch mechanisms
Solution Approach 2:
The torque limiter serves multiple functions: it protects the driveline from overload, stabilizes the rotation of the lateral drive shaft, and works jointly with the flywheel to counteract vibrations. This multi-functionality reduces the need for additional separate components, thereby reducing device complexity
3Stability of the object's composition
If the lateral drive shaft rotation is stabilized using a flywheel, then the operational smoothness improves, but the weight of the moving object increases
Solution Approach 1:
The patent merges the torque limiter housing with the flywheel into a single integrated component. The housing of the torque limiter is configured to realize or contribute to the function of stabilizing the rotation of the lateral drive shaft, and the flywheel is incorporated within or as part of this housing structure. This integration allows the system to benefit from both the torque limiting function and the rotational stabilization function without the weight penalty of separate components
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
The solution provides a simpler and more effective driveline configuration that stabilizes the rotation of the lateral drive shaft, reducing complexity and enhancing operational efficiency by incorporating a torque limiter and flywheel for overload protection.
Implementation Method 1
a clutch mechanism configured to rotatably engage or disengage the housing relative to the hub or vice versa
Implementation Method 2
The header according to the invention may be a combine header or any other agricultural header comprising reciprocating knives
Implementation Method 3
a driveline comprises a flywheel so that the torque limiter and the flywheel jointly perform the stabilizing function
Implementation Method 4
The lateral drive shaft is coupled respectively to the bevel gearbox and the transmission by a first and second universal joint
Implementation Method 5
a bevel gearbox, a lateral drive shaft adjacent a sidewall and a transmission
Data Source
Figure 1~2
Figure 3~5b
Figure 6
AI summary
An agricultural header (1) comprises a header frame formed by back wall (4) and two sidewalls (3), and a set of knives configured to undergo a reciprocating transverse movement. The header further comprises a driveline for driving said reciprocating movement, the driveline including a transverse drive shaft (15) at the back of the header frame, a bevel gearbox (18), a lateral drive shaft (21) adjacent a sidewall and a transmission (31) in the vicinity of the knives and configured to directly drive the knife motion. According to the invention, a torque limiter (35) is mounted between the drive shaft and the transmission, said torque limiter comprising a housing (47), a central hub (49) and a clutch mechanism configured to rotatably engage or disengage the housing relative to the hub or vice versa. The housing (47) is configured to realize or contribute to the function of stabilizing the rotation of the lateral driveshaft (21) when the clutch mechanism is engaged.