Segmented Master Gearwheel for Tolerance-Based Rolling Tests
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Solution Overview
Problem
The existing rolling test for gearings using master gearwheels with uniform teeth geometry generates redundant information and fails to predict the subsequent rolling behavior of the gearing to be tested, especially when considering tolerance positions and direction of geometric deviations.
Innovation Solution
A master gearwheel with segments having different tooth geometries that simulate extreme tolerance positions of the mating gear, allowing for the evaluation of rotational errors and hobbing behavior, thereby providing more informative results on the rolling behavior of the gearing to be tested.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a master gearwheel with uniform tooth geometry is used for rolling test, then the measurement process is simple and standardized, but redundant information is generated and rolling behavior prediction is not possible
Solution Approach 1:
The master gearwheel is divided into multiple segments, where each segment contains teeth with specific geometric deviations. This segmentation allows different tooth geometries to be systematically arranged, enabling the generation of meaningful test data for various tolerance positions without creating redundant information across the entire gearwheel.
Solution Approach 2:
Different segments of the master gearwheel are assigned different tooth geometries that correspond to specific tolerance positions or deviation types. This local differentiation ensures that each segment provides targeted information about specific geometric deviations, eliminating the redundancy present in uniform geometry designs while maintaining manufacturing feasibility.
2Ease of operation
If a master gearwheel with uniform tooth geometry is used, then the test procedure is straightforward, but the rolling behavior with actual mating gear cannot be predicted
Solution Approach 1:
The master gearwheel is pre-configured with segments representing extreme tolerance positions and typical deviation patterns before the actual rolling test. This preliminary setup allows the test to directly simulate real-world operating conditions, enabling reliable prediction of rolling behavior with actual mating gears while maintaining a straightforward test procedure.
Solution Approach 2:
The tooth geometry parameters are systematically varied across different segments to represent different tolerance positions and deviation types. This parameter differentiation enables the test to capture the influence of various geometric deviations on rolling behavior, providing reliable predictions without complicating the test operation.
3Manufacturing precision
If all tolerance positions are considered for determining rolling test tolerances, then comprehensive coverage is achieved, but the test complexity and data evaluation burden increase
Solution Approach 1:
Instead of testing all tolerance positions uniformly, the master gearwheel is segmented to represent only the most critical tolerance positions and typical deviation patterns. This segmentation reduces the number of test configurations needed while maintaining comprehensive coverage of essential tolerance scenarios, thereby simplifying data evaluation.
Solution Approach 2:
The most influential tolerance positions and deviation types are extracted and represented in specific segments of the master gearwheel. This extraction approach focuses the test on the most critical factors affecting rolling behavior, reducing overall test complexity while maintaining adequate manufacturing precision coverage.
Data Source
AI summary
A master gearwheel for the rolling test of gearings, wherein the master gearwheel has a gearing having a number of teeth, wherein the master gearwheel has at least two segments, wherein one tooth or several teeth of the teeth are assigned to each of the segments and wherein the teeth of one of the segments has a geometry which is different from the geometry of the teeth of another of the segments.