Rotatable Gear Locking Element for Tractor PTO Shaft Hub
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Solution Overview
Problem
The existing shaft-hub connection mechanisms, particularly in tractor power take-off systems, are inconvenient and time-consuming to handle due to the need for simultaneous compression and rotation of a snap ring, which can lead to loss and interruptions in fieldwork.
Innovation Solution
A twistable locking element with a gear design that is complementary to the second shaft, allowing for easy establishment and detachment of the shaft-hub connection by transitioning between locked and unlocked positions, preventing loss and simplifying the handling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a snap ring is used to secure the shaft-hub connection, then the connection can be secured axially, but the handling becomes inconvenient and time-consuming due to the need for simultaneous compression and rotation
Solution Approach 1:
The locking element is made rotatable relative to the first shaft, transitioning between locked and unlocked positions. This dynamic capability allows the operator to easily secure or release the connection by simply rotating the locking element, eliminating the complex simultaneous compression and rotation required for snap rings.
Solution Approach 2:
The locking element automatically maintains the shaft-hub connection in the locked position through its gear engagement with the second shaft. The design allows the connection to be secured by simple rotation, with the system itself maintaining the locked state without requiring continuous operator intervention or complex manual manipulation.
2Reliability
If a snap ring is used to secure the shaft-hub connection, then the connection can be established, but the risk of loss increases and interruptions in fieldwork occur
Solution Approach 1:
The locking element is integrated with the first shaft through a rotatable connection, merging the securing function directly into the shaft assembly. This integration ensures the locking element cannot be lost separately, as it remains permanently attached to the first shaft while still allowing easy operation.
Solution Approach 2:
The rotatable connection between the locking element and first shaft allows the locking element to move freely for operation but remains physically attached, preventing loss while enabling easy transition between locked and unlocked states during fieldwork.
3Ease of operation
If a locking element with gear is used instead of snap ring, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The locking element combines multiple functions into a single component: it provides axial securing through gear engagement, allows easy operation through rotation, and prevents loss through integration with the first shaft. This multi-functionality reduces the need for separate components like snap rings and simplifies the overall system.
Solution Approach 2:
The locking mechanism is segmented into distinct functional parts: the locking element itself, the gear engagement interface, and the rotatable connection to the first shaft. This segmentation allows each component to be optimized for its specific function while maintaining overall simplicity and ease of manufacture.
Data Source
AI summary
A coupling mechanism secures a shaft-to-collar connection for two shafts, such as an extension shaft stub and a tractor PTO shaft. An annular locking element on the first shaft prevents an axial disconnection of an established connection. One of the shafts has a collar with a positive engagement element for a locking engagement with the other shaft. The other shaft includes a positive engagement for a locking engagement with the collar. To enable an easier handling of the axial locking of the shaft to collar connection, the locking element includes a first set of teeth which are complementarily to a second set of teeth on the second shaft. The locking element is rotatably arranged on the first shaft and can be rotated from a locked position to an unlocked position. In the locked position the teeth overlap.