Extruded Ring Gear Production for Flexible Small-Batch Planetary Gears
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Solution Overview
Problem
The high costs and production time associated with producing ring gears for planetary gear trains using injection molding, especially for small batches, as each specification requires a new mold, limiting cost-effective production of small lots.
Innovation Solution
A method utilizing an extrusion process to produce a continuous profile, which is then cut to desired lengths to form ring gear bodies, allowing for adaptable production without the need for multiple molds, with internal toothing formed during extrusion and end plates added via joining methods for customization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If injection molding process is used to produce ring gears, then manufacturing precision and quality are improved, but production costs and production time increase significantly for small batches
Solution Approach 1:
The ring gear production is segmented into two independent parts: a continuous profile produced by extrusion and individual ring gear bodies cut from this profile. This segmentation allows the expensive mold to be used only once for the continuous profile, while individual parts are obtained through cutting, dramatically reducing per-unit costs for small batches while maintaining precision through the controlled extrusion process
Solution Approach 2:
The continuous profile with internal toothing is produced in advance through extrusion as a preliminary action. This pre-formed profile serves as a ready-to-cut blank for multiple ring gears, eliminating the need to re-create the complex toothing geometry for each individual gear and reducing both cost and time for small batch production
2Manufacturing precision
If new injection molds are produced for each ring gear specification, then manufacturing precision is ensured, but production time and device complexity increase
Solution Approach 1:
A single extrusion mold produces a universal continuous profile that can be cut into multiple ring gears with different specifications (different numbers of teeth, different diameters) by varying the cutting positions and methods. This universal profile eliminates the need to produce new molds for each specification, reducing mold production time while maintaining precision through controlled cutting processes
Solution Approach 2:
Different ring gear specifications are achieved by changing parameters during the cutting process (cutting length, cutting position, number of cuts) rather than changing the mold itself. The continuous profile serves as a master from which various configurations can be derived through parameter variation in the cutting stage, eliminating repeated mold production cycles
3Reliability
If traditional production methods are used for small lots of planetary gear trains, then quality is maintained, but production cost increases
Solution Approach 1:
The production method segments the ring gear into a continuous profile (produced once by extrusion) and individual cuttable sections. This allows small lots to be produced economically by cutting only the required number of ring gear bodies from the continuous profile, maintaining quality through controlled extrusion and cutting while dramatically reducing costs compared to producing each ring gear as a complete injection molded part
Solution Approach 2:
The continuous profile acts as a disposable master from which multiple ring gears can be cut. Once the continuous profile has been cut into the required number of ring gear bodies, it can be discarded or recycled, eliminating the need for expensive reusable injection molds while still enabling quality production of small batches
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 approach reduces production costs and time, enabling quick production of ring gears with varying specifications and stages from a single continuous profile, with the ability to easily modify configurations and eliminate manual processing steps, resulting in a cost-effective and efficient manufacturing process.
Implementation Method 1
a continuous profile is produced by an extrusion process
Implementation Method 2
the cutting can comprise a laser cutting on the rotating end profile
Data Source
AI summary
A method for producing a ring gear for a planetary gear train, wherein a continuous profile is produced by an extrusion process and the continuous profile is subsequently cut to a predetermined cutting length in order to form a ring gear body.