Planetary Transmission Disk Layout for Sun Gear Separation
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Solution Overview
Problem
Conventional planetary transmission stages face challenges in achieving a long service life while maintaining a compact configuration and ensuring reliable lubricant supply and mutual protection between sun gears.
Innovation Solution
Incorporating a centrally positioned, axially uninterrupted disk between sun gears, which acts as a spacer and lubricant channel, and using nitrided steel disks with radially extending channels to ensure continuous lubricant supply and prevent sun gear contact, while being retained securely through snap rings and stepped bores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a disk is interposed between the first sun gear and the second sun gear to prevent mutual contact, then the service life is extended, but the axial space requirement increases
Solution Approach 1:
A disk is introduced as an intermediary element between the first sun gear and the second sun gear. This disk serves as a physical barrier that prevents direct contact between the two sun gears, thereby extending the service life of the transmission by eliminating wear and potential damage from gear-to-gear contact.
Solution Approach 2:
The patent employs a thin disk structure that provides effective separation between sun gears while minimizing axial space consumption. The disk is designed with optimal thickness to achieve the protective function without unnecessarily increasing the axial dimension of the transmission assembly.
2Length of moving object
If the disk is made thin to maintain compact configuration, then the axial space is reduced, but the structural strength may be compromised
Solution Approach 1:
The disk is constructed from composite materials that provide high strength-to-weight ratio and adequate mechanical properties despite the thin profile. This allows the disk to maintain structural integrity and perform its protective function effectively while keeping the axial space requirement minimal for compact transmission design.
3Reliability
If lubricant channels are provided through the disk, then the lubricant supply is improved, but the manufacturing complexity increases
Solution Approach 1:
The disk incorporates segmented lubricant channels that are strategically positioned to deliver lubricant to critical areas. These channels are integrated into the disk structure during manufacturing, providing reliable lubricant supply to the planet gears and other moving components while maintaining manufacturability through standard machining or molding processes.
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 enhances the service life of the transmission by maintaining a compact design, ensuring reliable lubrication, and preventing sun gear contact, thereby increasing the transmission's durability and efficiency.
Implementation Method 1
the disk is made from steel and is subjected to a nitriding treatment
Data Source
AI summary
A transmission includes at least a first and a second planetary transmission stage. The first planetary transmission stage has a first planet-gear carrier including bolts on which first planets which mesh with a first sun gear are rotatably mounted, and the second planetary transmission stage has a second planet-gear carrier including bolts on which second planets which mesh with a second sun gear are rotatably mounted. The first planet-gear carrier is connected to the second sun gear in a torsionally fixed manner, and a disk is accommodated centrally in the first planet-gear carrier in a recess, e.g., in an axially uninterrupted recess, which is situated axially between the first sun gear and the second sun gear.