Variable Pressure-Angle Sprocket for Low-Tension Noise Control
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Solution Overview
Problem
Existing sprockets with phase variation patterns for reducing noise and vibration are ineffective in managing tension fluctuations and noise generation due to periodic load torque variations, especially when chain tension is low or load torque is small, and can lead to resonance issues.
Innovation Solution
A sprocket design with teeth having an equal pitch and varying working pressure angles relative to the chain, allowing dynamic adjustment of the pitch line with load torque changes, and a continuous variation pattern in working pressure angles to align with torque variation periods, reducing tension fluctuations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a phase variation pattern is used to reduce tension fluctuations, then noise and vibration are suppressed under normal load, but tension fluctuations and noise increase when chain tension is low or load torque is small
Solution Approach 1:
The patent changes the geometric parameters of the sprocket teeth by varying the working pressure angles while maintaining equal pitch between teeth. This parameter variation allows the pitch line to dynamically adjust with load torque changes, suppressing tension fluctuations across different operating conditions including low load scenarios.
Solution Approach 2:
The invention introduces dynamic adaptability to the sprocket design through varying working pressure angles that respond to changing load conditions. The pitch line dynamically shifts based on the applied torque, enabling the system to maintain optimal performance whether the chain is under high tension or low tension conditions.
2Object-affected harmful factors
If teeth are arranged with equal pitch to suppress noise at low load, then tension fluctuations are reduced, but order noises corresponding to periodic load torque variations increase
Solution Approach 1:
The patent applies local quality by giving each tooth a specific working pressure angle tailored to its position in the rotation cycle. This localized variation in tooth geometry allows different parts of the sprocket to optimize for different phases of the periodic load torque variation, suppressing order noises while maintaining equal pitch.
Data Source
AI summary
To provide a sprocket that reduces the influence of tension fluctuations concurrent with load torque variations, that suppresses noise and vibration, and that prevents an increase in tension fluctuations, noise, and vibration even when the chain tension is low and the load torque is small, or in regions where a chain and the sprocket engage without being affected by the tension. The sprocket has a plurality of teeth mating with the chain that are provided with an equal pitch therebetween, and that include teeth with different working pressure angles relative to the chain.