Transmission Shaft Layout to Cut Oil Stirring Resistance
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Solution Overview
Problem
The arrangement of an air breather chamber and an oil catch tank in a power transmission device can restrict the placement of shafts, forcing some shafts to be immersed in the oil reservoir, leading to increased stirring resistance.
Innovation Solution
The power transmission device is designed with an air breather chamber provided above and near the third shaft, an oil catch tank above and near the first shaft, and an oil guide above the second shaft, allowing the second shaft to be positioned outside the oil reservoir, reducing stirring resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the air breather chamber and oil catch tank are provided in the case, then the oil level of the oil reservoir can be lowered to reduce stirring resistance, but the arrangement of these components restricts the placement of shafts and may force shafts to be immersed in the oil reservoir
Solution Approach 1:
The patent applies dimensional arrangement by positioning the air breather chamber above the third shaft and the oil catch tank above the first shaft in the vertical dimension, while the second shaft is arranged in the horizontal plane outside the oil reservoir. This spatial distribution across different dimensions resolves the contradiction by allowing optimal placement of both the oil management components and the shafts without mutual interference.
2Productivity
If the second shaft is positioned outside the oil reservoir, then stirring resistance is reduced and power transmission efficiency is improved, but the arrangement of air breather chamber and oil catch tank may restrict this placement
Solution Approach 1:
The patent segments the case interior into distinct functional zones: the oil reservoir area containing the first and third shafts, and the air-breathing area above where the second shaft is positioned. The air breather chamber and oil catch tank are strategically placed to define these zones, allowing the second shaft to operate in the air zone outside the oil reservoir, thereby reducing stirring resistance while maintaining organized spatial segmentation.
3Device complexity
If shafts are forced to be immersed in the oil reservoir due to component arrangement, then the air breather chamber and oil catch tank can be properly positioned, but stirring resistance increases and power transmission efficiency decreases
Solution Approach 1:
The patent introduces the air breather chamber as an intermediary component that mediates between the oil reservoir and the atmosphere. By positioning this chamber above the third shaft and using it as a spatial reference point, the design creates a buffer zone that allows the second shaft to be positioned outside the oil reservoir while maintaining proper oil management functionality through the oil catch tank system.
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 reduces stirring resistance of the shafts, improving power transmission efficiency by positioning the second shaft outside the oil reservoir and enabling effective oil management through the oil catch tank.
Implementation Method 1
a third gear portion (331) which receives power from the second gear portion (221) and at least a part of which is immersed in the oil reservoir (10a)
Implementation Method 2
an oil catch tank (10c) that reserves an oil raked up by the third gear portion (331)
Implementation Method 3
an oil guide (10d) that introduces the oil raked up by the third gear portion (331) into the oil catch tank (10c)
Implementation Method 4
an air breather chamber (10b) that separates air and an oil in the case (10) and communicates with the atmosphere
Implementation Method 5
When the oil level is lowered, stirring resistance of the shaft immersed in the oil reservoir is reduced, thereby improving power transmission efficiency of the device
Data Source
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AI summary
[PROBLEMS] Stirring resistance of a shaft in an oil reservoir is improved. [SOLUTIONS] A power transmission device includes a case including an oil reservoir at a lower portion thereof, and a first shaft, a second shaft, and a third shaft which are shaft-supported by the case. The first shaft is connected to a power source and includes a first gear portion which outputs power from the power source. The second shaft includes a second gear portion which receives power input from the first gear portion and which outputs the received power. The third shaft includes a third gear portion which receives power from the second gear portion and which has at least a part immersed in the oil reservoir. The case includes an air breather chamber that separates air and an oil in the case and communicates with the atmosphere, an oil catch tank that reserves an oil raked up by the third gear portion, and an oil guide that introduces the oil raked up by the third gear portion into the oil catch tank. The air breather chamber is provided above and near the third shaft. The oil catch tank is provided above and near the first shaft. The oil guide is provided above the second shaft. The second shaft is disposed outside the oil reservoir in the case.