Gear Pair Testing via Structure-Borne Noise Screening
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Solution Overview
Problem
Current methods for testing gear pairs are either too time-consuming and reproducible or too imprecise, making it challenging to rapidly and reliably determine the suitable installation position and quality of gearsets, which affects noise level and fatigue life.
Innovation Solution
A device and method combining structure-borne noise testing or rotational acceleration measurement with single-flank working test, where a specific installation position is first determined using structure-borne noise criteria, followed by a quantitative single-flank working test to assess the gear pair's running behavior, allowing for rapid and reliable quality testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-flank working test is performed at multiple installation positions to check displacement sensitivity, then measurement reliability is improved, but measurement time increases significantly
Solution Approach 1:
The patent applies preliminary action by performing a rough screening test (structure-borne noise or rotational acceleration measurement) at multiple installation positions first to identify promising candidates, then performing the more time-consuming single-flank working test only at selected positions. This preliminary classification allows the system to filter out unsuitable gear pairs before investing significant measurement time, thereby resolving the contradiction between comprehensive testing and time consumption.
2Productivity
If structure-borne noise testing or rotational acceleration measurement is used, then measurement speed is improved, but measurement precision deteriorates
Solution Approach 1:
The patent segments the measurement process into two distinct stages: a fast screening stage using structure-borne noise or rotational acceleration measurement to evaluate multiple installation positions quickly, and a precise evaluation stage using single-flank working test at selected positions. This segmentation allows the system to leverage the speed advantage of the first method while ensuring final precision through the second method, resolving the contradiction between measurement speed and precision.
Solution Approach 2:
The patent applies partial action by using the faster structure-borne noise or rotational acceleration measurement for the majority of installation positions (partial testing), and reserving the more precise but time-consuming single-flank working test for only the most promising positions (excessive precision where needed). This selective application of measurement precision resolves the contradiction by applying high precision only where necessary while maintaining overall measurement speed.
3Manufacturing precision
If single-flank working test is performed at all installation positions, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent uses structure-borne noise or rotational acceleration measurement as a preliminary filtering step to identify installation positions that show promising running behavior characteristics. Only at these pre-selected positions is the more time-consuming single-flank working test performed. This preliminary classification enables the system to maintain high manufacturing precision assessment while significantly improving productivity by avoiding exhaustive testing at all positions.
Solution Approach 2:
The patent introduces structure-borne noise or rotational acceleration measurement as an intermediary method that bridges the gap between fast but less precise screening and slow but precise single-flank working test. This intermediary provides a quick assessment that guides subsequent precise measurements, enabling the system to achieve high manufacturing precision assessment with improved productivity by reducing the number of positions requiring detailed testing.
Data Source
AI summary
A device (10) for measuring the running behavior of a gear pair having a rolling device (12) which comprises one spindle (15, 16) per gear (13, 14) and has at least one drive (17; 18) for driving one of the gears (13, 14). Furthermore, a structure-borne noise sensor (20), a sequence controller (30), and a speed sensor system (23, 24) are provided. The sequence controller (30) is designed in such way that a combined test of the gear pair may be performed, in which, in a first search run, a specific installation position is ascertained using structure-borne noise testing and subsequently a single-flank working test is performed at the specific installation position.