Planetary Transmission Disc Pack Lubrication via Dual Collecting Grooves
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Solution Overview
Problem
Existing planetary transmissions in motor vehicles face challenges in efficiently supplying lubricant to the disc pack, leading to potential inefficiencies and increased wear due to inadequate lubrication.
Innovation Solution
A dual collecting groove system is integrated into the planetary transmission, with one groove connected to the planetary gear pin and another to the inner disc support, along with radial lubricant channels and a lubricant tube, ensuring targeted and efficient lubrication of the disc pack through centrifugal force and controlled lubricant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single collecting groove is used for lubricant supply, then the structure is simple, but the lubricant distribution to the disc pack is insufficient and not targeted
Solution Approach 1:
The single collecting groove is divided into multiple collecting grooves (first collecting groove connected to ring gear, second collecting groove connected to planetary gear pin). Each groove independently collects and directs lubricant to specific areas of the disc pack, enabling targeted lubrication while maintaining structural simplicity through modular design.
2Productivity
If lubricant supply is not targeted, then the structure is simple, but operational losses increase and efficiency decreases
Solution Approach 1:
Different collecting grooves are positioned to supply lubricant to different local areas of the disc pack. The first collecting groove supplies lubricant through radial lubricant channels to one region, while the second collecting groove supplies to another region, ensuring each area receives adequate lubrication without excess loss.
3Reliability
If multiple collecting grooves and radial channels are added for targeted lubrication, then lubricant distribution improves, but the device complexity increases
Solution Approach 1:
The multiple collecting grooves and radial lubricant channels are integrated into the existing planetary transmission housing structure. The grooves and channels form a unified lubricant distribution system that combines collection, guidance, and delivery functions within the existing component framework, minimizing additional complexity.
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
The solution provides a robust and efficient lubricant supply mechanism, minimizing losses and enhancing the operational efficiency and longevity of the disc pack components.
Implementation Method 1
leveraging centrifugal forces and rotational dynamics
Data Source
AI summary
A planetary transmission has a collecting groove for a lubricant and a planetary gear set having a planetary support rotatable around a planetary gear set axis of rotation in relation to a housing of the planetary transmission, planetary gears rotatably mounted on the planetary support, and a ring gear meshing with the planetary gears. The transmission has a disc coupling having an inner disc support connected to the collecting groove in a rotationally fixed manner, an outer disc support connected to the housing of the planetary transmission in a rotationally fixed manner, and a set of friction discs. The inner disc support is connected to the ring gear in a rotationally fixed manner. The ring gear and/or a cylinder portion connected to the ring gear in a rotationally fixed manner has a first lubricant channel running radially with respect to the planetary gear set axis of rotation.