Tractor PTO Shaft Coupling Shield with Self-Aligning Locking Mechanism
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Solution Overview
Problem
Existing devices for coupling a universal joint shaft to a tractor's power take-off shaft require precise alignment and complex mechanisms, making the coupling process cumbersome and prone to unintended detachment.
Innovation Solution
A device with a first non-rotatably arranged coupling mechanism on the universal joint shaft and a second on the power take-off shaft, featuring a coupling shield with a locking mechanism and centering mechanisms that allow for easy alignment and self-actuated coupling without the need for precise alignment or additional cumbersome components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling frame and three-point coupling mechanism are used to connect the universal joint shaft to the power take-off shaft, then the coupling can be achieved, but the device complexity increases and the alignment requirements become more stringent
Solution Approach 1:
The patent extracts and removes the complex coupling frame and three-point coupling mechanism from the system. Instead, it uses a simplified direct coupling approach where the universal joint shaft connects directly to the power take-off shaft through a minimal coupling structure, eliminating unnecessary intermediate components while maintaining coupling reliability
Solution Approach 2:
The coupling mechanism is segmented into functional modules: a coupling element with longitudinal slots on the universal joint shaft, and a corresponding coupling element with protrusions on the power take-off shaft. This modular segmentation allows for simplified alignment and connection without requiring a complex integrated coupling frame
2Ease of operation
If precise alignment of the carrier arm to the coupling hub is required before coupling, then direct coupling is enabled, but the ease of operation deteriorates due to the stringent alignment requirements
Solution Approach 1:
The coupling elements are designed with dynamic alignment capabilities. The longitudinal slots in the coupling element allow for automatic adjustment and self-alignment during the coupling process, eliminating the need for precise pre-alignment. The coupling mechanism adapts to minor position variations automatically through its inherent mechanical flexibility
Solution Approach 2:
The coupling mechanism performs self-alignment through its geometric design. The longitudinal slots and protrusions are configured to guide and center the coupling elements automatically during engagement, without requiring external alignment tools or precise manual positioning. The system self-adjusts to achieve proper coupling
3Reliability
If locking balls are pushed radially outwards into an inner circumferential groove to prevent unintended detachment, then the coupling security is improved, but the device complexity increases due to the additional locking components
Solution Approach 1:
The locking function is merged with the coupling elements themselves. The longitudinal slots and protrusions are integrated into the coupling structure, serving both the coupling and locking functions simultaneously. This eliminates the need for separate locking balls, retaining rings, or additional securing components while maintaining coupling security
Solution Approach 2:
The coupling elements are designed with multi-functionality. The same structural features (longitudinal slots and protrusions) that enable coupling also provide the locking function. This universal design eliminates the need for specialized locking components, reducing overall device complexity while maintaining security
Data Source
AI summary
A device for coupling a universal joint shaft to a power take-off shaft (1) of a tractor has a first coupling mechanism (48) that is non-rotatably arranged on the universal joint shaft. A second coupling mechanism (17) is non-rotatably arranged on the power take-off shaft (1) of the tractor. The first and second coupling mechanisms can be non-rotatably coupled to transmit torque. A coupling shield (7) is provided to couple the coupling mechanism (17, 48). The first coupling mechanism (48) is at least indirectly rotationally supported on the coupling shield (7). A locking mechanism (58, 58′) projects from the coupling shield (7). A bracket (2) is attachable on the rear of the tractor. The bracket (2) has at least one locking device (5, 5′) that is displaceable between an unlocked position and a locked position. The locking device (5, 5′) is displaced from the unlocked position into the locked position. The locking device (5, 5′) interacts with the locking members (58, 58′) of the coupling shield (7) to pull it towards the bracket (2). The first coupling mechanism (48) is transferred into a coupling position to couple it the second coupling mechanism (17).