Multi-part Drive Train for Large Swather Rake Heads
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Solution Overview
Problem
Existing hay-making machines with large working widths face technical complexity and high maintenance due to complex drive concepts, leading to vibrations and increased repair needs, particularly with large deflection angles and multiple components required for conversion between working and transport positions.
Innovation Solution
A hay-making machine with a V-shaped arrangement of rake rotors and a multi-part drive train using a W-bend configuration for the intermediate shaft, which includes a rigid intermediate shaft held by a bracket connected to a length-adjustable lifting arm, reduces irregularities and maintains uniform rotational movement, minimizing vibrations and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a complex drive concept with multiple components is used to achieve large working width, then the working width is increased, but the device complexity and maintenance requirements increase
Solution Approach 1:
The drive train is divided into modular components: a main drive shaft connected to individual drive units for each rake rotor. Each drive unit is a self-contained module that can be independently maintained or replaced, reducing overall system complexity while enabling large working width through multiple rotors
Solution Approach 2:
The main drive shaft serves multiple functions: it transmits power to all rake rotors simultaneously and provides a structural framework for mounting drive units. This multi-functionality reduces the need for separate transmission components for each rotor, simplifying the overall drive train while maintaining large working width capability
2Area of moving object
If a complex drive concept with large deflection angles is used, then the working width is increased, but vibrations and wear increase
Solution Approach 1:
Each drive unit is designed with locally optimized components: universal joints are positioned to minimize deflection angles, and drive shafts are sized appropriately for their specific torque and speed requirements. This local optimization reduces vibrations and wear at each connection point while maintaining the overall large working width configuration
Solution Approach 2:
The drive train incorporates damping elements and properly sized drive shafts that are pre-calculated to withstand expected vibration loads. Universal joints are selected with appropriate vibration compensation capabilities, providing beforehand cushioning against the harmful effects of large deflection angles and uneven terrain
3Adaptability or versatility
If multiple individual components are used for position conversion, then the adaptability is increased, but the device complexity increases
Solution Approach 1:
The drive train incorporates telescopic drive shafts that can dynamically adjust their length to accommodate different positions of the rake rotors. This dynamic adjustment capability allows the system to transition between working and transport positions using the same drive train components, reducing the need for separate mechanisms for each position while maintaining full adaptability
Data Source
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AI summary
The present invention provides a haymaking machine with two front rake heads, each rotatably mounted on a front lifting arm, and with at least one rear rake head, characterized in that at least one of the front lifting arms is length-adjustable, wherein the corresponding front rake head is mounted at one end of the front lifting arm and the other end of the front lifting arm is pivotably mounted on a support frame of the haymaking machine, that the corresponding rake head can be driven via a multi-part drive train, and that the multi-part drive train comprises a rigid intermediate shaft which is held via a bracket connected to the front lifting arm.