Transfer Input Shaft Lubrication via Connection Holes
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Solution Overview
Problem
Conventional power transmission systems require additional space and complexity for lubrication mechanisms and channels to supply sufficient lubricating fluid to transfer devices, leading to system enlargement.
Innovation Solution
Incorporating a fluid reservoir within the case housing the differential and transfer devices, where the rotation member scoops up lubricating fluid and guides it through connection holes and rib structures to ensure efficient lubrication without the need for external lubrication mechanisms or channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lubrication mechanism or channel is installed in the power transmission system to supply lubricating fluid to the transfer device, then the transfer device receives sufficient lubrication, but the system size and complexity increase
Solution Approach 1:
The transfer input shaft utilizes its own rotation to scoop up lubricating fluid through connection holes, eliminating the need for external lubrication mechanisms. The rotating shaft itself serves as the lubrication delivery system, with lubricant being picked up by the shaft's rotation and distributed to bearing portions automatically
Solution Approach 2:
The transfer input shaft performs multiple functions: it transmits driving force from the transfer input gear to the transfer output shaft, and simultaneously serves as a lubrication distribution mechanism by scooping up lubricating fluid and delivering it to bearing portions through its rotation
2Reliability
If a lubrication mechanism or channel is installed in the power transmission system to supply lubricating fluid to the transfer device, then the transfer device receives sufficient lubrication, but the system size increases
Solution Approach 1:
The transfer input shaft utilizes its own rotation to scoop up lubricating fluid through connection holes, eliminating the need for external lubrication mechanisms. The rotating shaft itself serves as the lubrication delivery system, with lubricant being picked up by the shaft's rotation and distributed to bearing portions automatically
Solution Approach 2:
The lubrication function is merged with the existing transfer input shaft structure. The connection holes are formed directly in the shaft, combining the lubrication delivery path with the shaft itself, thereby eliminating separate lubrication channels and reducing overall system size
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 solution allows for constant and stable lubrication of transfer devices, preventing fluid splashing at high speeds and eliminating the need for additional lubrication mechanisms or channels, thus avoiding system enlargement while ensuring adequate lubrication.
Implementation Method 1
the lubricating fluid is scooped up from the fluid reservoir with the rotating rotation member
Data Source
AI summary
A transfer input shaft 51 of a transfer device 5 of a power transmission system PT has a first connection hole 51a that extends in a rotational axis direction from an end face on the side of a transfer input gear 55 that meshes with a final driven gear 42, and that connects the inside of a transmission case 61 and the inside of a transfer case 53. The transmission case 61 has a rib 62 that receives lubricating fluid scraped up by a final driven gear 42, and guides it toward the first connection hole 51a, in a position facing the end face of the transfer input shaft 51.