Rotational Coupling Bearing Shield for Air Gap Debris Blocking
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Solution Overview
Problem
Conventional rotational coupling devices face challenges in preventing contaminants like fluids and particulates from reaching the bearing, which can reduce the device's lifespan. Additionally, existing debris shields require separate assembly, leading to user inconvenience and potential misinstallation.
Innovation Solution
The rotational coupling device incorporates a shield that extends across the air gap between the hub assembly and the electromagnet, inhibiting contaminants from reaching the bearing. The shield is pre-assembled with the device, eliminating the need for separate assembly and reducing the risk of misinstallation. In certain embodiments, the shield also enhances flux transfer within the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is attached to the bearing race to inhibit contaminants, then the bearing is protected from contaminants, but the assembly becomes more complex and requires separate assembly operations
Solution Approach 1:
The shield is integrated directly into the bearing assembly during manufacturing, combining the shield function with the bearing structure. This eliminates the need for separate seal attachment operations and reduces assembly complexity while maintaining bearing protection from contaminants.
Solution Approach 2:
The shield is pre-installed on the bearing during the bearing manufacturing process rather than requiring field assembly. This preliminary action ensures the shield is already in place before the bearing is installed in the coupling device, eliminating separate assembly operations and reducing the risk of improper installation.
2Reliability
If a separate shield is provided for assembly by the end user, then the bearing can be protected from contaminants, but the user may forget or improperly install the shield
Solution Approach 1:
The shield function is merged with the bearing assembly itself, making the protective function an integral part of the bearing rather than a separate component. This ensures the shield is always present and correctly positioned without requiring user action.
Solution Approach 2:
The bearing assembly provides its own protective shielding function through the integrated shield, eliminating the need for the end user to perform any separate installation actions. The protective function is self-contained within the bearing assembly.
3Reliability
If the shield extends across the air gap to improve contaminant protection, then the bearing is better protected, but the device complexity increases
Solution Approach 1:
The shield structure is merged with existing components in the coupling device, such as the hub assembly or electromagnet housing, rather than being a completely separate component. This integration approach provides extended contaminant protection without proportionally increasing device complexity.
Solution Approach 2:
The shield structure serves multiple functions: it protects the bearing from contaminants, maintains proper air gap spacing, and may provide flux transfer paths. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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
The solution effectively prevents contaminants from reaching the bearing, thereby extending the device's lifespan and simplifying user assembly. Additionally, the improved flux transfer in certain embodiments enhances the device's performance.
Implementation Method 1
a shield partially disposed within the air gap and extending across the entire radial length of the air gap
Implementation Method 2
An electromagnet is disposed on the opposite side of the disc relative to the armature and is energized and de-energized to cause the armature to engage with, and disengage from, the disc
Data Source
AI summary
A rotational coupling includes a hub assembly configured for rotation about a rotational axis. The hub assembly includes a hub disposed about the axis and configured to receive a shaft and a disc extending radially outwardly from the hub. An armature and electromagnet are disposed on opposite axial sides of the disc. The electromagnet is fixed against rotation. A bearing is disposed between the hub and the electromagnet. The hub assembly and electromagnet are separated by an air gap on an outboard side of the bearing. A debris shield is axially aligned with, and extends across the radial length of, the air gap and, in some embodiments, is at least partially disposed within the air gap. The shield has a fixed end coupled to one of the hub assembly and electromagnet during assembly and a free end configured to engage the other through a spring force and/or electromagnetic attraction.