Vehicle Transmission Lubricating System Gravity Oil Return
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Solution Overview
Problem
Lubricating systems for vehicle transmission devices, particularly in electric and hybrid vehicles, face challenges in maintaining a stable oil level in the first oil storage part due to low levels in the second oil storage part or catch tank, leading to insufficient lubrication of gear mechanisms and bearings.
Innovation Solution
A lubricating system with a third oil storage part positioned above the first and second oil storage parts, featuring a first outlet that allows lubricating oil to flow by gravity to the first oil storage part without passing through the second, ensuring stable oil levels and eliminating the need for complex control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricating oil is supplied from the second oil storage part to the first oil storage part to control oil level, then the oil level in the first oil storage part can be maintained, but the system becomes complex and unreliable when the second oil storage part level is low
Solution Approach 1:
The invention divides the oil storage system into three independent storage parts (first, second, and third oil storage parts) with separate functions. The third oil storage part is specifically dedicated to receiving excess oil from the first oil storage part and returning it when needed, creating a segmented backup system that simplifies control logic while maintaining reliability.
Solution Approach 2:
The third oil storage part acts as an intermediary between the first and second oil storage parts. It receives oil from the first storage part when oil level is high and returns oil to the first storage part when oil level is low, mediating the oil level control without requiring direct complex control between the first and second storage parts.
2Device complexity
If a mechanical oil pump is used to supply lubricating oil to the gear mechanism, then the system is simple, but it cannot maintain stable oil level when the second oil storage part level is low
Solution Approach 1:
The third oil storage part is pre-filled with lubricating oil and positioned at a higher location than the first oil storage part. This preliminary preparation ensures that when the first oil storage part level drops, oil can immediately flow back to it by gravity without requiring active pumping or control intervention.
Solution Approach 2:
The third oil storage part is positioned at a higher elevation than the first oil storage part, creating a gravitational potential difference that enables automatic oil flow. This height difference establishes an equipotential system where oil naturally flows from high to low levels, eliminating the need for complex pumping control.
3Ease of operation
If the third oil storage part is positioned above the first and second oil storage parts, then gravity enables automatic oil flow, but the system height increases
Solution Approach 1:
The third oil storage part is positioned in the vertical dimension above the first and second oil storage parts. This vertical arrangement exploits the height dimension to enable gravity-driven automatic oil flow control, simplifying operation while accepting the trade-off of increased system height.
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 maintains stable oil levels in the first oil storage part, ensuring adequate lubrication regardless of the second oil storage part's level, reduces the need for complex control systems, and achieves cost reduction by simplifying the system design.
Implementation Method 1
a first outlet that allows lubricating oil to flow out by gravity toward a first oil storage part without passing through a second oil storage part
Data Source
AI summary
A lubricating system of a vehicle transmission device includes a third oil storage part that is provided above a first oil storage part and a second oil storage part in a vehicle height direction. The third oil storage part stores lubricating oil, and includes a first outlet that allows the lubricating oil to flow out by gravity toward the first oil storage part without passing through the second oil storage part. As the lubricating oil is thus returned from the first outlet to the first oil storage part without passing through the second oil storage part, the oil level in the first oil storage part can be stably maintained with the lubricating oil supplied thereto regardless of the oil level in the second oil storage part.