Planetary Transmission Flat Notch Coupling for Compact Gear Stages
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Solution Overview
Problem
Existing planetary transmissions face challenges in minimizing axial and radial installation space, leading to complex designs and increased costs due to the need for additional components and extensive machining.
Innovation Solution
The implementation of a flat notch toothing system, also known as a spur toothing system, which directly or indirectly connects the sun shaft and planetary carrier, eliminating the need for a hub and allowing for axial and radial space savings by using fastening elements like screws, thereby simplifying production and machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional planetary transmission design is used, then the transmission can achieve required torque and speed ratios, but it occupies larger axial and radial installation space
Solution Approach 1:
The planetary carrier is segmented into a hub portion and a planetary gear carrier portion, allowing independent optimization of each component. The hub portion connects to the sun shaft while the gear carrier portion supports the planetary gears, enabling space reduction without compromising structural integrity
Solution Approach 2:
The planetary gears are nested within the planetary carrier structure, with the sun shaft positioned centrally and planetary gears orbiting around it. This nested arrangement minimizes radial space occupation while maintaining the required gear meshing geometry for torque transmission
2Reliability
If additional components like hubs are added to connect sun shaft and planetary carrier, then the connection stability is improved, but the production cost and machining complexity increase
Solution Approach 1:
The hub portion of the planetary carrier is merged with the planetary gear carrier portion into a single integrated component. This consolidation eliminates the need for separate hub assemblies and reduces the number of fastening elements required, thereby lowering production costs while maintaining connection stability through the unified structure
Solution Approach 2:
The planetary carrier hub is designed to serve multiple functions simultaneously: it provides structural support for the planetary gears, establishes the connection interface with the sun shaft, and defines the orbital path for planetary gear rotation. This multi-functionality reduces the need for additional specialized components
3Volume of moving object
If the planetary carrier is made compact to save space, then installation space is reduced, but accessibility for machining becomes more difficult
Solution Approach 1:
The planetary carrier is segmented into distinct functional portions with clear geometric separation. The hub portion has a simplified geometry optimized for machining accessibility, while the gear carrier portion accommodates the planetary gears. This segmentation allows each portion to be machined independently with appropriate tool access, despite the overall compact design
Data Source
AI summary
A planetary transmission includes at least two planetary stages. A sun shaft of a planetary stage of the at least two planetary stages is connected for transmission of torque via a coupling toothing system to a planetary carrier of a second transmission stage of the at least two planetary stages that follows the first transmission stage. The coupling toothing system is a flat notch toothing system. A drive train of a wind power plant, in which a corresponding planetary transmission is used as transmission, is also provided. A wind power plant that is equipped with a corresponding drive train is provided. An industrial application that has a corresponding planetary transmission as transmission is also provided.