Gear Tooth Flank Modification for Low-Noise Contact Accuracy
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Solution Overview
Problem
Current psychoacoustic noise reduction methods for gear sets, such as topography scattering, introduce tooth thickness and indexing errors, leading to reduced gear quality and potential premature failure due to edge contact and inconsistent contact patterns, while requiring complex data processing and multiple machine settings for each tooth slot.
Innovation Solution
A method involving controlled stock removal on a work gear using a tool that moves along multiple axes, with first and second level modifications defined by functions like cosine and sinusoidal functions to control maximal flank form deviations and tooth surface modifications, ensuring consistent tooth thickness and indexing without edge contact, applied in generating processes like bevel gear grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If topography scattering is applied to reduce psychoacoustic noise, then noise reduction is achieved, but tooth thickness and indexing errors are introduced
Solution Approach 1:
The modification is segmented into two hierarchical levels: first level controls the maximum amplitude of flank form deviation for each tooth, while the second level defines the specific modification pattern on the tooth surface. This segmentation allows independent optimization of noise reduction amplitude and contact pattern quality.
Solution Approach 2:
The invention changes the parameters of flank form modification by introducing a two-level functional control system. The first level parameter (maximum amplitude) and second level parameter (modification pattern) are independently adjustable, enabling optimization of both psychoacoustic noise reduction and gear quality without the trade-off present in conventional single-level approaches.
2Object-affected harmful factors
If topography scattering is applied, then noise reduction is achieved, but edge contact and inconsistent contact patterns occur
Solution Approach 1:
The second level function provides feedback control by defining the modification pattern based on the first level amplitude parameters. This ensures that the contact pattern remains consistent and predictable while still achieving noise reduction, as the modification is systematically controlled rather than random.
3Object-affected harmful factors
If complex data processing and multiple machine settings are used for each tooth slot, then psychoacoustic optimization is achieved, but manufacturing complexity increases
Solution Approach 1:
The two-level functional approach provides a universal framework that can be applied to all teeth in the gear set using a consistent mathematical model. This eliminates the need for complex individual settings for each tooth slot, as the same functional framework governs all modifications, significantly reducing manufacturing complexity.
Data Source
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AI summary
A method of producing a tooth flank surface on gear teeth by controlled removal of stock material from a work gear with a tool with the work gear and the tool being movable with respect to one another along and/or about a plurality of axes. The tool and work gear are engaged with one another and then moved relative to one another in a generating motion along and/or about the plurality of axes. Stock material is removed from the work gear to produce the tooth surface on the work gear. The generating motion along and/or about the plurality of axes comprises motion along and/or about at least one of the axes with the motion being defined by a function having a first level component and a second level component. The first level component defining a maximum flank form deviation amplitude for each tooth of the work gear, and the second level component defining a modification of the tooth surface of each tooth of the work gear.