Work Vehicle Three-Point Hitch Attachment Leveling Mechanism
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Solution Overview
Problem
Existing three-point hitch attachment devices for work vehicles often result in an inclined position of the attachment relative to the ground during pivoting, leading to uneven working depths and potential soil compaction issues during crab steering operations.
Innovation Solution
An adjusting device is integrated between the lifting device and the lower links, which automatically corrects the tilting movement, ensuring the attachment maintains a horizontal position by compensating for the displacement caused by the pivoting mechanism, thereby preventing tilting and maintaining consistent working depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lower links are pivoted to enable crab steering operation, then the attachment can run at an angle to the direction of travel, but the attachment assumes an inclined position relative to the ground causing uneven working depths
Solution Approach 1:
A turntable is introduced as an intermediary component between the lower links and the attachment. The turntable receives pivoting movement from the lower links and transfers it to the attachment, while its vertical axis allows the attachment to maintain a horizontal position relative to the ground even when the lower links are displaced at angles, thus preventing tilting during crab steering operations
Solution Approach 2:
The solution adds a vertical dimension to the pivoting mechanism by introducing a turntable that rotates about a vertical axis. This allows the attachment to be positioned at angular orientations (for crab steering) while maintaining its horizontal working position, separating the orientation function from the elevation function
2Device complexity
If the upper link is rigidly articulated to the work vehicle frame, then the structure is simplified, but displacing the lower links causes the attachment to tilt around its longitudinal center axis
Solution Approach 1:
The turntable acts as a mediator between the rigid upper link articulation and the lower link displacement. It absorbs the tilting effect that would otherwise be transmitted to the attachment, allowing the simple rigid upper link structure to be maintained while preventing attachment instability during lower link pivoting
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 solution allows for efficient operation without additional structural components, ensuring the attachment remains level and protects the soil by maintaining consistent working depth and reducing soil compaction during crab steering.
Implementation Method 1
a lifting device which has a lifting piston arranged in a power lift block
Implementation Method 2
a pivoting device for the synchronous displacement of the lower links from their basic position into a position in which the angle of one lower link is increased and that of the other lower link is reduced analogously
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The mechanism (4) has a three-point suspension for receiving a mounting device with a pair of lower link (6,7). A pivoting unit is used for the synchronous displacement of the lower links out of basic position into another position. The second ends (28,29) are provided with receptacles having coupling elements (30,31) coupled to the attachment. An actuating device (33) is arranged between a lifting device (14) and lower links by which a displacement of the pivoting unit of the lower links and horizontal position of the unmodified second ends are maintained.