Silent Chain Guide Plate Engagement Timing
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Solution Overview
Problem
The silent chain transmission system experiences noise issues due to guide plates contacting sprocket teeth before middle and inner link plates, leading to reduced noise performance when the silent chain is in a transverse-runout state.
Innovation Solution
The guide plates are designed to avoid contact with sprocket teeth by setting the engagement starting points of link plates at positions where guide plates do not engage with sprocket teeth until link plates start to engage, maintaining the original engagement configuration and preventing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide plate is positioned to engage with the sprocket tooth early, then the chain engagement is more stable, but noise increases due to guide plate contact before link plate engagement
Solution Approach 1:
The link plate serves as an intermediary element that engages with the sprocket tooth before the guide plate. By designing the engagement sequence so that the link plate (intermediary) contacts the sprocket first, the direct contact between the guide plate and sprocket is prevented, thereby reducing noise while maintaining stable chain engagement
Solution Approach 2:
The link plate is positioned to perform preliminary engagement with the sprocket tooth before the guide plate engages. This preliminary action by the link plate ensures that the guide plate does not contact the sprocket prematurely, thus preventing noise generation while maintaining reliable chain engagement
Data Source
AI summary
In a silent chain transmission, noise performance is improved by preventing guide plates of a silent chain from contacting sprocket teeth before the link plates of the chain contact the sprocket teeth. The silent chain transmission comprises a silent chain in engagement with a sprocket. The silent chain comprises guide rows, each having a pair of guide plates and a plurality of middle link plates, and non-guide rows, each having a plurality of inner link plates. An engagement starting point of the middle link plate with a sprocket tooth and an engagement starting point of the inner link plate with the sprocket tooth are set at positions such that the guide plate is prevented from contacting the sprocket tooth before the respective link plates start to engage the sprocket tooth when runout of the chain in the direction of its width occurs.