Offset Compound Bearing Assembly for Axial Load and Heat Control
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Solution Overview
Problem
Concentric compound bearing assemblies fail to evenly distribute axial loads, leading to increased wear and early failure, especially in high-speed rotational systems like vehicle supercharger systems, and are not suited to withstand generated heat.
Innovation Solution
A compound bearing assembly with an offset coupler supporting an inner and outer bearing, featuring elongated elliptical openings for oil flow and ceramic or titanium components, which distributes loads and provides an oil flow path between the bearings to reduce friction and heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If concentric bearing design is used, then the bearing assembly can support rotational loads, but the axial load is not evenly distributed leading to increased wear and early failure
Solution Approach 1:
The patent applies asymmetry by transitioning from a concentric bearing arrangement to an offset bearing arrangement. The inner bearing and outer bearing are positioned at different radial locations rather than being concentric, creating an asymmetric load path that enables even distribution of axial loads across both bearings. This asymmetric positioning prevents the inner bearing from bearing the entire axial load, thereby reducing wear and extending bearing lifespan.
2Productivity
If high-speed rotation is implemented, then productivity increases, but heat generation increases leading to overheating
Solution Approach 1:
The patent employs hydraulic cooling by introducing a cooling fluid (oil) through the offset coupler into the bearing assembly. The offset positioning of the bearings creates a fluid passage that allows cooling oil to flow between the inner and outer bearings, carrying away heat generated during high-speed rotation. This hydraulic cooling system enables the bearing assembly to maintain operational temperatures even at high rotational speeds, thus preserving productivity while preventing overheating.
3Temperature
If offset coupler with fluid passage is added, then heat dissipation improves, but device complexity increases
Solution Approach 1:
The offset coupler serves multiple functions simultaneously: it positions the inner and outer bearings at offset locations to enable even load distribution, and it provides a fluid passage for cooling oil flow to remove heat. By combining the positioning function and the cooling function in a single component, the patent avoids adding separate complex cooling systems, thus improving heat dissipation while minimizing 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 offset coupler design ensures even load distribution and efficient heat dissipation, enabling the bearing assembly to operate at high speeds without overheating, thus extending its lifespan and improving performance in high-speed applications.
Implementation Method 1
an inner bearing cage including a plurality of elongated openings for allowing oil flow within the inner bearing
Implementation Method 2
the offset coupler positions the inner bearing and the outer bearing such that the outer bearing is offset along the longitudinal axis with respect to the inner bearing to distribute a load from the drive shaft and impeller
Implementation Method 3
the offset coupler positions the inner bearing and the outer bearing such that the outer bearing is offset along the longitudinal axis with respect to the inner bearing to distribute a load from the drive shaft and impeller, and to provide an oil flow path between the inner bearing and the outer bearing
Implementation Method 4
the plurality of inner bearing balls, the plurality of outer bearing balls, or both include ceramic
Data Source
AI summary
Systems and methods are provided for a compound bearing assembly including an offset coupler supporting an inner bearing and an outer bearing for distributing a rotational loading of the compound bearing assembly. In some embodiments, at least one of the bearings comprises a bearing cage with a plurality of elongated openings for receiving a respective plurality of balls. The compound bearing assembly is configured to support a drive shaft of a supercharger system of a vehicle or some other rotational system.