Planetary Gear Housing Laser Welding Overlap
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Solution Overview
Problem
Existing transmission housings with integrated internal teeth have unused space due to the necessary overlapping area for laser welding, limiting the compactness and functionality, especially in small transmissions where high transmission ratios are required.
Innovation Solution
A gear housing with a hollow-cylindrical body featuring a first internal toothing and a bearing flange with a second internal toothing in the overlapping area, allowing for laser transmission welding and enabling the integration of an additional planetary gear, thus achieving compact dimensions and high functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an overlap area is provided for laser transmission welding between the bearing flange and housing body, then the manufacturing process is simple and cost-effective, but unused spaces are created that reduce compactness
Solution Approach 1:
The patent merges the overlap area (originally unused space for welding) with a functional second internal toothing. The bearing flange is designed with this second toothing that engages with the first toothing on the housing body, transforming the wasted overlap space into a useful gear engagement zone that provides additional planetary gear support while maintaining the laser welding connection.
2Adaptability or versatility
If two internal toothed sections are integrated into the housing body, then gear functionality is enhanced, but the housing body must be axially open on both sides increasing complexity
Solution Approach 1:
The patent segments the housing structure into two separate components: the housing body with the first internal toothing and the bearing flange with the second internal toothing. This segmentation allows the second toothing to be formed on the bearing flange (which can be axially open on one side only) rather than requiring the entire housing body to be open on both sides, thus reducing structural complexity while maintaining dual gear functionality.
3Volume of moving object
If compact dimensions are achieved in small gearboxes, then space is optimized, but the ability to achieve high transmission ratios is limited
Solution Approach 1:
The patent implements a nested gear configuration where the second internal toothing on the bearing flange engages with the first internal toothing on the housing body, creating a compact dual-stage planetary gear system. This nested arrangement allows two gear stages to be integrated within the same radial space, achieving high transmission ratios without increasing the overall gearbox dimensions.
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 design allows for a high level of functionality with compact dimensions, simplifies assembly, increases stability, and reduces manufacturing costs by using fewer components and optimizing the use of internal space, while also accommodating different gear reductions and thermal expansion through adjustable tooth geometries.
Implementation Method 1
A laser beam is directed onto this overlap area, causing the material of the bearing flange to melt and bond with the housing body
Implementation Method 2
causing the material of the bearing flange to melt and bond with the housing body
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a gearbox housing for a planetary gearbox with a hollow cylindrical housing body (10) having a first internal toothing (11) and a bearing flange (20) that engages coaxially, at least partially, in the housing body (10) to form a contact area (30), wherein the housing body (10) and the bearing flange (20) are metallurgically joined in the contact area (30) by laser transmission welding. The invention is characterized in that the bearing flange (20) has a second internal toothing (21) in the contact area (30). Furthermore, the invention relates to a planetary gearbox and a motor-gearbox combination with such a gearbox housing, as well as a manufacturing method.