Tedder Hydraulic Folding for Three-Position Adjustment
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Solution Overview
Problem
Existing tedders face challenges with complex and expensive hydraulic systems that require multiple circuits and cylinders, leading to increased weight and error-proneness, while also needing multiple hydraulic connections from the carrier vehicle to achieve different folding positions.
Innovation Solution
A tedder with a simplified hydraulic system using two folding cylinders, a carrier cylinder, and a pressure closing valve, along with a valve means that bypasses the pressure closing valve to allow adjustment in multiple positions using only one hydraulic connection from the carrier vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex hydraulic systems with multiple circuits and cylinders are installed to achieve different folding positions, then the tedder can be positioned in multiple configurations, but the device complexity, cost, and weight increase
Solution Approach 1:
The patent merges the functions of multiple hydraulic circuits into a single hydraulic connection from the carrier vehicle. The hydraulic system uses one connection point that provides pressure to both the folding cylinders and the carrier cylinder through a shared hydraulic line, eliminating the need for separate hydraulic circuits for each function.
Solution Approach 2:
The single hydraulic connection from the carrier vehicle serves multiple functions: it provides pressure to the folding cylinders for folding the wing arms, provides pressure to the carrier cylinder for lifting the carrier beams, and enables control of the valve means for position adjustment. This multi-functional hydraulic connection reduces the overall system complexity.
2Adaptability or versatility
If multiple hydraulic connections from the carrier vehicle are used to achieve different folding positions, then the tedder can be adjusted in multiple positions, but the weight and number of components increase
Solution Approach 1:
The patent combines multiple hydraulic functions into a single connection from the carrier vehicle. The hydraulic line from the carrier vehicle connects to a common hydraulic connection point on the tedder, which then distributes pressure to both the folding cylinders and the carrier cylinder, eliminating the need for separate hydraulic connections.
3Shape
If the tedder is folded completely in transport position to comply with road regulations, then the dimensions are reduced, but the time required for folding and positioning increases
Solution Approach 1:
The patent introduces an intermediate headland position that is dynamically adjustable between the fully extended working position and the fully folded transport position. This intermediate position allows the tedder to be folded only partially (wing arms lifted about 10 degrees) when needed, providing flexibility in positioning without requiring complete folding, thus reducing the time required for position changes.
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
Enables the tedder to be adjusted in three positions - working, headland, and transport - with reduced complexity, cost, and weight, while maintaining compatibility with various carrier vehicles and preventing mechanical drivetrain damage.
Implementation Method 1
The hydraulic system comprises at least two folding cylinders for folding the wing arms and a pressure closing valve for limiting the hydraulic pressure supplied to the folding cylinders
Implementation Method 2
a pressure closing valve for limiting the hydraulic pressure supplied to the folding cylinders
Implementation Method 3
a valve means that is formed and arranged to bypass the pressure closing valve upon actuation
Data Source
Figure 1
Figure 2~4
Figure 5a
AI summary
The invention relates to a tedder comprising a main frame connectable to a carrier vehicle, two pivotal wing arms including at least one carrier beam respectively oriented transversely to the direction of travel, a plurality of rotors arranged on the carrier beams for tedding and turning harvested material and a hydraulic system. The hydraulic system comprises two folding cylinders for folding the wing arms and a pressure closing valve for limiting the hydraulic pressure of the folding cylinders. The hydraulic system further comprises a carrier cylinder for lifting the carrier beams with respect to the main frame, wherein a valve means that is formed and arranged to bypass the pressure closing valve upon actuation.