Gearwheel Harmonic Tooth Modification for Reliable Noise Correction
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Solution Overview
Problem
Existing gearwheel noise optimization methods, which involve randomly distributed modifications, lead to large measurement deviations when only a few teeth are measured, making correction unreliable and requiring high effort, as the noise-optimized setpoint geometry needs to be specifically considered for each tooth or gap.
Innovation Solution
A gearwheel with a modification in pitch and/or topography changing from tooth to tooth, based on a superposition of at least two harmonic functions differing in amplitude, frequency, or phase shift, allowing for reliable measurement and correction without tooth-specific or gap-specific consideration, ensuring the gearwheel can be manufactured within specified tolerance limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If randomly distributed modifications are applied to gearwheel teeth to improve subjective noise behavior, then noise perception is improved, but measurement deviations increase and reliability of correction decreases
Solution Approach 1:
The patent changes the parameter of modification distribution from random to structured harmonic patterns. By using superposition of harmonic functions with specific frequencies and amplitudes, the pitch and topography modifications follow predictable mathematical patterns rather than random distributions, enabling reliable measurement and correction while maintaining noise reduction benefits
Solution Approach 2:
The patent applies periodic harmonic functions to define the pitch and topography modifications across gearwheel teeth. These periodic patterns with specific frequencies create predictable, repeating modification sequences that can be reliably measured and corrected, unlike random modifications
2Measurement precision
If measurement of all teeth or gaps is performed to enable reasonable measurement despite random modifications, then measurement precision improves, but device complexity and effort increase
Solution Approach 1:
The patent changes the measurement approach by utilizing the known harmonic parameters (frequencies, amplitudes, phases) of the modifications. Instead of measuring all teeth against a complex noise-optimized setpoint geometry, the measurement system can work with standard setpoint geometry and use the harmonic parameters to interpret measurements from fewer teeth, reducing device complexity while maintaining precision
Solution Approach 2:
The patent creates a mathematical model (copy) of the modifications using harmonic functions. This model allows the measurement system to predict expected deviations based on harmonic patterns, enabling accurate measurement and correction without requiring complex measurement of all teeth or access to noise-optimized setpoint geometry
3Measurement precision
If noise-optimized setpoint geometry is provided for each tooth or gap to enable specific measurement and evaluation, then measurement precision improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes from requiring tooth-specific noise-optimized setpoint geometries to using standard setpoint geometry combined with harmonic function parameters. The harmonic parameters (frequencies, amplitudes, phases) serve as additional descriptors that allow measurement and evaluation without deviating from standard manufacturing specifications, thus maintaining manufacturing precision while achieving measurement precision
Data Source
AI summary
A gearwheel, wherein the gearwheel has a setpoint geometry, wherein the gearwheel has a modification superimposed on the setpoint geometry in the form of a pitch and/or topography changing from tooth to tooth, wherein a variation of the pitch and/or topography specified by the modification, observed over a total number of teeth of the gearwheel, corresponds to a superposition of at least two harmonic functions, which differ from one another in one parameter or in multiple parameters, such as their amplitude, frequency, or phase shift.