Planetary Gear Lubrication via Equal-Distance Oil Holes
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Solution Overview
Problem
In double pinion type planetary gear mechanisms, the uneven distances of pinion shafts from the carrier axis lead to inadequate lubrication of inner diameter side pinion shafts, reducing their durability due to insufficient lubricating oil supply.
Innovation Solution
The lubricating structure features an oil catch plate with inner and outer diameter side introducing holes of equal distance from the carrier axis, ensuring equal lubricating oil supply to both sides without separate introducing sections, simplifying the oil catch plate's shape and enhancing design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate introducing sections are provided for outer diameter side and inner diameter side pinion shafts, then lubricating oil can be supplied to both pinion shafts, but the outer periphery of the oil catch plate becomes complicated in shape
Solution Approach 1:
The introducing section is segmented into two independent oil introducing holes: an outer diameter side lubricating oil introducing hole and an inner diameter side lubricating oil introducing hole. Each hole independently supplies lubricating oil to its respective pinion shaft, eliminating the need for complex separate introducing sections while ensuring reliable lubrication to both pinion shafts.
2Reliability
If separate introducing sections are provided for outer diameter side and inner diameter side pinion shafts, then lubricating oil can be supplied to both pinion shafts, but sealing member disposal becomes difficult
Solution Approach 1:
The introducing section is divided into two independent oil introducing holes with separate sealing members. Each hole has its own sealing member disposed at the periphery, allowing for simple and independent sealing of each lubrication path. This segmentation makes it easy to install and maintain sealing members compared to complex integrated introducing sections.
3Device complexity
If a single introducing section is used for both pinion shafts, then the oil catch plate shape is simple, but lubricating oil is not supplied to the inner diameter side pinion shaft when oil amount is insufficient
Solution Approach 1:
The introducing section is segmented into two independent oil introducing holes: an outer diameter side lubricating oil introducing hole and an inner diameter side lubricating oil introducing hole. Each hole independently supplies lubricating oil to its respective pinion shaft, eliminating the need for complex separate introducing sections while ensuring reliable lubrication to both pinion shafts.
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 ensures consistent lubrication for both outer and inner diameter side pinion shafts, improving the durability of the inner diameter side bearing section and simplifying the design of the oil catch plate, reducing manufacturing complexity and maintaining sealing efficiency.
Implementation Method 1
an oil catch plate has been generally provided on a side face of a carrier in the planetary gear mechanism so as to lead lubricating oil to bearing members that support pinion shafts
Data Source
AI summary
There is provided a lubricating structure of a planetary gear mechanism which can simplify the outer shape of an introducing section formed by an oil catch plate, for introducing lubricating oil, and ensure a high degree of design freedom. In a double pinion type planetary gear mechanism, the distance from the axis of a carrier to the outermost edge of an opening in the direction of the carrier's diameter in an lubricating oil introducing hole formed in an outer diameter side pinion shaft and the distance from the axis of the carrier to the outermost edge of an opening in the direction of the carrier's diameter in an lubricating oil introducing hole formed in an inner diameter side pinion shaft are equal to each other. Therefore, lubricating oil can be supplied to the inner diameter side pinion shaft through the introducing section irrespective of the amount of lubricating oil that can be supplied to the outer diameter side pinion shaft. Also, the shape of a centrifugal cancel piston as the oil catch plate forming the introducing section can be simplified to increase the degree of design freedom.