Shaft Mounting Assembly with Anti-Rotation Key and Torque Indicator
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Solution Overview
Problem
Wedge-type bearing assemblies are difficult to mount on a shaft due to the inner ring rotating independently of the sleeve, making it challenging to determine the correct tightening torque, leading to potential over or under tightening.
Innovation Solution
A split cylindrical adapter sleeve with a radially outwardly facing tapered surface and a positive locking key to prevent inner ring rotation, along with a visual indicator on the lock nut to signify sufficient tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a tapered sleeve and lock nut are used to mount the bearing assembly, then the bearing assembly can accommodate shafts with varying circumferences, but the inner ring rotates independently of the sleeve making it difficult to determine correct tightening torque
Solution Approach 1:
The patent employs color-coded torque indicators on the lock nut that change color or display different colors based on the tightening torque applied. This visual feedback system allows the operator to easily determine when the correct tightening torque has been achieved, eliminating the difficulty of judging torque without specialized tools while maintaining the adaptability of the tapered sleeve design.
2Reliability
If a lock nut is used to tighten the inner ring onto the sleeve, then the bearing assembly can be secured to the shaft, but it is difficult to prevent over or under tightening
Solution Approach 1:
The patent incorporates visual feedback mechanisms in the form of color-coded indicators on the lock nut that provide real-time information about the tightening torque being applied. This feedback system allows the operator to adjust the tightening process to achieve the precise correct torque, preventing both over-tightening and under-tightening while ensuring reliable secure engagement of the bearing assembly with the shaft.
3Ease of operation
If the inner ring is allowed to rotate independently during tightening, then the lock nut can be threaded onto the sleeve, but the inner ring may rotate with the nut without moving axially relative to the sleeve
Solution Approach 1:
The patent separates the rotational function and axial movement function into distinct components. The lock nut is designed to rotate independently to tighten the assembly, while the inner ring is prevented from rotating independently through anti-rotation features such as keys or splines. This segmentation allows the lock nut to be easily threaded and tightened without causing unwanted rotation of the inner ring, simplifying the overall operation while controlling the relative movements.
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
Prevents independent rotation of the inner ring, allows easy determination of proper tightening, and ensures secure engagement with the shaft, preventing over or under tightening.
Implementation Method 1
The sleeve is typically pulled into engagement with the tapered bore in the inner ring of the bearing assembly by a lock nut axially fixed relative to the sleeve and threadably engaging the inner ring. Rotation of the nut around the sleeve draws the inner ring over the sleeve to produce a the wedge-like engagement between the tapered sleeve and the tapered bore. The wedge-like engagement creates an interference fit between the sleeve and the inner ring and compresses the sleeve into locked engagement with the shaft.
Data Source
AI summary
A wedge-type bearing assembly includes a split cylindrical adapter sleeve for wrapping around a shaft. The sleeve has a radially outwardly facing tapered surface. An inner ring encircles the adapter sleeve and has a radially inwardly facing surface engaging the tapered surface of the adapter sleeve. In one embodiment, a visual indicator fixed to a lock nut connecting the adapter sleeve and inner ring indicates when the adapter sleeve is sufficiently tightened onto the shaft. In another embodiment, a positive locking key prevents rotation of the inner ring relative to the adapter sleeve.