Helical Differential Ring Gear Oil Splatter Cutaway
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In power transfer devices, working oil is not adequately removed from the differential chamber due to blocking by the reservoir plate, leading to residual oil and increased stirring resistance on the differential ring gear.
Innovation Solution
A power transfer device design featuring a helical differential ring gear and a partitioning member with a cutaway portion above the oil surface, allowing raked-up oil to be splattered into the working oil storage chamber, reducing residual oil and stirring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a reservoir plate is used to partition the differential chamber and storage chamber, then the structure is simple and easy to manufacture, but working oil is blocked from flowing out of the differential chamber
Solution Approach 1:
The invention extracts the harmful blocking function from the reservoir plate by introducing a cutaway portion. This removes the obstruction to oil flow while preserving the partitioning function, allowing oil to be raked out of the differential chamber without being blocked by the reservoir plate structure.
Solution Approach 2:
The cutaway portion creates a localized opening in the reservoir plate structure. This local modification allows oil to pass through specific regions while maintaining the overall partitioning structure, enabling differential oil to flow into the storage chamber without compromising the entire partition design.
2Reliability
If working oil is raked up by the differential ring gear, then lubrication is provided, but stirring resistance increases due to residual oil in the differential chamber
Solution Approach 1:
The cutaway portion extracts the residual oil from the differential chamber by allowing it to flow into the storage chamber. This removal of excess oil reduces the stirring resistance that would otherwise increase energy consumption of the differential ring gear.
Solution Approach 2:
The invention changes the oil distribution parameter in the differential chamber by enabling flow into the storage chamber. This parameter change reduces the volume of residual oil, thereby reducing stirring resistance and energy consumption while maintaining necessary lubrication.
3Productivity
If the differential ring gear is configured to rake working oil, then oil is directed toward the storage chamber, but a solid partition blocks the oil flow
Solution Approach 1:
The cutaway portion extracts the blocking function from the reservoir plate, creating an opening that allows oil to flow freely from the differential chamber to the storage chamber. This maintains the productive oil circulation path without adding complex flow control mechanisms.
Solution Approach 2:
Instead of making the reservoir plate fully permeable or adding complex flow control devices, the invention inverts the approach by creating a localized cutaway opening. This simple inversion of the solid partition concept allows oil flow while maintaining structural integrity and simplicity.
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
Effectively suppresses oil residence in the differential chamber and reduces stirring resistance by directing raked-up oil into the storage chamber, enhancing the operational efficiency of the power transfer device.
Implementation Method 1
the differential ring gear is constituted as a helical gear configured to provide a motion component directed toward the working oil storage chamber to raked-up working oil
Implementation Method 2
working oil raked up by the differential ring gear is splattered from the cutaway portion toward the working oil storage chamber by a motion component in a tangential direction by rotational motion of the differential ring gear
Data Source
AI summary
A sector-shaped cutaway portion which exposes a portion of a differential ring gear from a tooth tip to a tooth root is formed in a flange portion of a reservoir plate to extend in the rotational direction of the differential ring gear from an opening initial-end portion which is provided at a location rotated from the vertically lower portion of the differential ring gear by 90 degrees in the rotational direction, and the helix of the differential ring gear is formed so as to provide a motion component directed toward a converter housing (toward a working oil storage chamber) to working oil raked up by the differential ring gear. Consequently, working oil raked up by the differential ring gear can be directly splattered from the cutaway portion toward the converter housing, which makes it possible to suppress a residence of working oil in a differential chamber.