Drive End Bearing Cooling via Auxiliary Airflow Paths
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Solution Overview
Problem
Conventional main air flow paths in alternators are ineffective in cooling the drive end bearing due to pre-heated air, which reduces the bearing's lifespan.
Innovation Solution
The implementation of a drive end fan with auxiliary air flow inlet apertures that draw ambient temperature air and direct it radially outward along auxiliary bearing cooling system air paths adjacent to auxiliary fins on the front housing face, allowing the fins to transfer heat from the drive end bearing to the air flow, thereby cooling the bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional main air flow paths are used to cool the drive end bearing, then the bearing is cooled by air flow through the alternator, but the air is pre-heated by rectifiers and stator windings making cooling ineffective
Solution Approach 1:
The air cooling system is segmented into separate pathways: a first air flow path cools the drive end bearing using ambient temperature air drawn through inlet apertures in the drive end fan, while a second air flow path handles cooling of rectifiers and stator windings. This segmentation prevents hot air from preheating the bearing cooling air, resolving the temperature effectiveness issue while maintaining bearing reliability
Solution Approach 2:
The drive end fan serves as an intermediary device that performs dual functions: it drives the main air flow path for general cooling while simultaneously drawing ambient temperature air through its inlet apertures to create a separate cooling flow for the drive end bearing. This intermediary action enables independent control of bearing cooling temperature without affecting overall system cooling
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
This method enhances the cooling efficiency of the drive end bearing by utilizing ambient temperature air, reducing the bearing's temperature and prolonging its lifespan.
Implementation Method 1
the auxiliary fins transfer drive end bearing heat to the air flow
Implementation Method 2
the auxiliary fins transfer drive end bearing heat to the air flow, which cools the drive end bearing
Data Source
AI summary
Certain embodiments provide systems and methods for cooling a drive end bearing. The system may include an alternator including a drive end bearing, a drive end fan and a front housing face. The drive end fan may include a shaft aperture and auxiliary air flow inlet apertures positioned circumferentially around the shaft aperture. The front housing face may include auxiliary fins coupled to the drive end bearing. The auxiliary fins may protrude from the front housing face. The auxiliary fins may be arrayed axially on the front housing face. In various embodiments, the drive end fan is rotated to draw air through the auxiliary air flow inlet apertures and adjacent to at least a portion of auxiliary fins of the front housing face. The at least a portion of the auxiliary fins transfers heat from the drive end bearing to the air.