Vehicle Drive Lubricating Structure with Partition Wall Communication Hole
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Solution Overview
Problem
The existing dual-axis vehicle drive system lubricating structure struggles to effectively lubricate the bearing supporting the counter shaft due to the partition wall and bearing placement, which obstructs the flow of lubricating oil scooped up by the reduction gear pair.
Innovation Solution
A lubricating structure with a case, electric motor, counter shaft, reduction gear pair, catch tank, partition wall, bearing, oil passage, and communication hole is designed to guide lubricating oil from the gear chamber to the motor chamber, ensuring the bearing supporting the counter shaft is adequately lubricated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition wall is provided to partition the case into gear chamber and motor chamber, then the scooping effect of lubricating oil by reduction gear pair is improved, but the bearing supporting counter shaft cannot be lubricated due to blocked oil flow
Solution Approach 1:
A communication hole is introduced as an intermediary structure in the partition wall to allow lubricating oil to pass from the gear chamber to the motor chamber. This mediator resolves the contradiction by maintaining both the partitioning function for improved scooping effect and the oil flow path for bearing lubrication, without requiring complex additional mechanisms.
2Length of moving object
If bearing is positioned to overlap with large-diameter gear to reduce axial size, then axial dimension is reduced, but lubricating oil cannot reach the bearing
Solution Approach 1:
The communication hole acts as a mediator that bridges the spatial separation caused by the compact bearing positioning. It allows lubricating oil to travel through the partition wall and reach the bearing in the motor chamber, maintaining lubrication reliability despite the reduced axial size and overlapping configuration.
3Quantity of substance
If partition wall is introduced to improve oil scooping, then oil supply to gear chamber is enhanced, but oil flow to motor chamber is obstructed
Solution Approach 1:
The partition wall with communication hole segments the case into functional zones (gear chamber and motor chamber) while maintaining controlled fluid communication. This segmentation allows the system to benefit from improved oil scooping in the gear chamber while still providing accessible oil flow to the motor chamber through the strategically positioned communication hole.
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 configuration ensures reliable lubrication of the counter shaft bearing by facilitating the flow of scooped-up lubricating oil from the reduction gear pair to the motor chamber, addressing the previous difficulty in lubricating the counter shaft bearing.
Implementation Method 1
scooping up lubricating oil, which is stored at a bottom in a case of the vehicle drive system and supplied to a lubricated portion, with the reduction gear
Implementation Method 2
a communication hole provided in the partition wall, the communication hole providing communication between the oil passage and the motor chamber
Data Source
AI summary
A partition wall that partitions an inside of a case into a gear chamber in which a reduction gear pair is accommodated and a motor chamber in which an electric motor is accommodated, a bearing provided at a bearing support portion of the partition wall so as to overlap with a side portion of a large-diameter gear of the reduction gear pair in a direction of an axis and supporting a counter shaft, an oil passage provided in the gear chamber and guiding lubricating oil, scooped up by the large-diameter gear to a catch tank, and a communication hole provided in the partition wall and providing communication between the oil passage and the motor chamber, are provided. Lubricating oil introduced into the motor chamber via the communication hole is supplied to the bearing.