PTO Coupling Automatic Engagement Mechanism
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Solution Overview
Problem
Connecting and disconnecting mid-mounted implements, such as mower decks, to tractors is difficult due to the weight of the implement and the need for precise alignment of connection points, particularly for the PTO coupling, which requires additional effort and can be cumbersome.
Innovation Solution
An automatic connection mechanism featuring a pair of rear and forward lift linkages with pivotably connected draft links and a PTO coupling system using male and female members with splines, where the male PTO coupling member has a stepped outer body and beveled splines, allowing for axial movement and automatic engagement with the female PTO coupling member, facilitating quick and easy attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual connection methods are used for PTO coupling, then connection strength and reliability are ensured, but connection time and operational complexity increase significantly
Solution Approach 1:
The PTO coupling mechanism is designed to automatically align and engage the male and female coupling members through their own geometric features (beveled splines, tapered surfaces) without requiring external alignment tools or manual positioning adjustments, enabling the connection to serve itself
Solution Approach 2:
The coupling members are pre-configured with beveled splines and tapered surfaces that automatically perform the alignment function during the insertion process itself, eliminating the need for preliminary manual alignment operations before connection
2Measurement precision
If precise alignment of connection points is required, then connection accuracy is improved, but ease of operation deteriorates due to additional alignment effort
Solution Approach 1:
The PTO coupling members feature asymmetric beveled splines where one spline is longer than the others, creating a unique insertion orientation that automatically guides correct alignment during the connection process, eliminating the need for separate alignment operations
Solution Approach 2:
The coupling members incorporate tapered and curved surfaces that provide smooth guidance during insertion, allowing the male coupling member to automatically follow the tapered path into correct alignment with the female coupling member without requiring precise manual positioning
3Strength
If traditional PTO coupling methods are used, then connection strength is maintained, but device complexity increases due to additional alignment requirements and manual steps
Solution Approach 1:
The alignment function and connection function are merged into a single integrated action through the beveled spline design, where the same geometric features that provide mechanical strength also automatically perform alignment during insertion, eliminating the need for separate alignment mechanisms
Data Source
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AI summary
An automatic connection mechanism for a mid-mounted implement (100, 200) to a tractor (105) is disclosed. The automatic connection mechanism includes a rear lift linkage (114, 214) pivotably attached to the tractor (105), that automatically and releasably engage the rear of the implement (100, 200). The forward lift linkage (116, 216) is pivotably attached to the front of the implement (100, 200), and automatically and releasably engages the forward end of the tractor (105). A PTO coupling member (152, 252, 302) also is attached to the rear lift linkage to engage an opposing PTO coupling member (168, 268, 301) on the implement.