Rotating Upper Link Sleeve for Tractor Three-Point Lift
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Solution Overview
Problem
Existing mechanical upper links for three-point power lifts on agricultural tractors require manual adjustment and cannot be easily secured in a transport position without requiring a free hand, making operation cumbersome.
Innovation Solution
A longitudinally variable upper link with a cylindrical connecting sleeve and internal threads, allowing length adjustment by rotating the sleeve, and incorporating a retaining bar with a locking region and a support element to secure the upper link in a transport position using a self-locking snap closure or similar mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper link is blocked in transport position using a securing pin inside a U-shaped receiving plate, then the upper link can be secured in a predetermined transport position, but the upper link requires manual holding with the free hand during repositioning
Solution Approach 1:
The snap closure mechanism is designed to be self-retaining, where the retaining catch automatically engages with the locking region on the retaining bar when the upper link is in the transport position. The self-locking feature eliminates the need for manual intervention to maintain the blocked position, allowing both hands to remain free during operation.
2Adaptability or versatility
If the upper link length is made variable for different attachments, then adaptability to different seed drills and implements is improved, but the adjustment mechanism increases device complexity
Solution Approach 1:
The upper link incorporates a telescopic design with a cylindrical connecting sleeve that can be rotated to adjust the length. The sleeve contains internal threads that engage with corresponding external threads on the fastening elements, allowing the operator to extend or retract the upper link to the required length before securing it in place. This dynamic adjustment capability enables the same upper link to accommodate various attachment widths.
3Ease of operation
If a self-locking snap closure mechanism is implemented, then the upper link can be secured without manual intervention, but the mechanism structure becomes more complex
Solution Approach 1:
The snap closure mechanism is implemented as a separate, integrated component rather than a complex assembly. The retaining catch is designed as a distinct element that engages with the locking region on the retaining bar, creating a self-locking feature that secures the upper link in the transport position without requiring additional manual intervention or overly complex structural modifications.
Data Source
AI summary
An upper link for a three-point power lift of an agricultural tractor including a cylindrical connecting sleeve, a first fastening element rotated into a first open end of the cylindrical connecting sleeve and configured to be attached to the agricultural tractor, a second fastening element rotated into a second open end of the cylindrical connecting sleeve and configured to produce a releasable connection to an attachment, and a retaining bar attached to the first fastening element. The retaining bar includes a bar portion having a locking region for receiving a retaining catch and runs spaced apart along the cylindrical connecting sleeve. The retaining bar includes a support element encompassing the cylindrical connecting sleeve such that the connecting sleeve is rotationally displaceable, and the length of the upper link is varied by rotating the cylindrical connecting sleeve.