Modular Insulated Bearing System with Interchangeable Caps
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Solution Overview
Problem
Conventional electric machine bearing designs require multiple expensive and hard-to-procure insulated brackets and seals to accommodate user modifications, leading to high production costs and long lead times due to the need for different geometries and frequent bearing damage during conversion from non-insulated to insulated configurations.
Innovation Solution
A modular anti-friction insulated bearing system with a common bracket and interchangeable outer and inner bearing caps, along with a press-fitted insulation sleeve, allows for minimal machining and stocking of parts, enabling cost-effective and efficient user modifications without damaging the bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different brackets are stocked for each seal and insulation configuration, then user modification requirements are met, but inventory costs and complexity increase significantly
Solution Approach 1:
The system divides the bearing assembly into modular components: a common bracket, interchangeable seals, and replaceable bearing units. This segmentation allows different seal configurations to be accommodated without requiring different brackets, reducing inventory complexity while maintaining adaptability.
Solution Approach 2:
A single universal bracket design is created that can accommodate multiple seal types and both insulated and non-insulated configurations. This universal bracket serves multiple functions across different motor configurations, eliminating the need to stock multiple specialized brackets.
2Adaptability or versatility
If the inner cap is replaced during modification from non-insulated to insulated bracket, then insulation requirement is met, but the bearing is damaged and must be scrapped
Solution Approach 1:
The bearing is pre-assembled with the inner cap as an integrated unit. When modification from non-insulated to insulated configuration is needed, the entire pre-assembled bearing unit is replaced rather than disassembling and replacing just the inner cap, preventing bearing damage.
Solution Approach 2:
The inner cap is nested within the bearing assembly as an integrated component. The insulation sleeve is then nested over the bearing outer diameter. This nested structure allows the bearing and inner cap to be replaced together as one unit, preserving bearing integrity during modifications.
3Object-affected harmful factors
If specialized insulated bearings and brackets are used, then insulation against shaft currents is achieved, but procurement cost and difficulty increase
Solution Approach 1:
An insulation sleeve is introduced as an intermediary component that provides electrical isolation between the bearing and the motor housing. This sleeve can be easily fitted over standard bearings, achieving insulation without requiring expensive specialized insulated bearings.
Solution Approach 2:
The electrical insulation property is achieved by adding an insulating layer (sleeve) rather than changing the fundamental bearing material or structure. This allows standard, readily available bearings to be used while achieving the required insulation parameter.
Data Source
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AI summary
An anti-friction insulated bearing system, including a bracket (62) disposed about a motor driveshaft (71) and a bearing (72) disposed within the bracket configured to support the driveshaft for rotation. The system also includes an outer bearing cap (68) disposed proximal a drive end of the bracket and an inner bearing cap (70). The system further includes an insulation sleeve (66) disposed within the bracket proximal the bearing. The outer bearing cap, the inner bearing cap and the insulation sleeve are configured as modular components of the system. The modular insulation sleeve allows the use of standard anti-friction rolling element bearings. The modular components have common inner and outer bearing caps that can be used across a multitude of configurations with a minimal number of parts.