Inverted Tooth Chain Inside Flank Projection for Chordal Motion Reduction
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Solution Overview
Problem
Conventional inverted tooth chain systems experience significant noise and vibration due to chordal action during meshing with sprockets, as the chain is forced out of a straight line path to compensate for vibration, which does not optimize chain/sprocket meshing dynamics and may exacerbate transverse vibration.
Innovation Solution
The design minimizes perpendicular chain movement by optimizing the projection of inside flanks relative to outside flanks, ensuring the engaging flank of each sprocket tooth makes initial contact with the leading inside flanks of the chain, with a maximum inside flank projection of 0.010×P to 0.020×P, thereby reducing chordal motion to no more than 40% of the maximum chordal rise distance, and maintaining inside flank engagement to minimize noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional inside flank engagement is used, then power transmission is achieved, but chain-sprocket impact noise and vibration increase due to chordal action
Solution Approach 1:
The patent modifies the geometric parameters of the chain link toes by optimizing the projection of inside flanks relative to outside flanks. Specifically, the inside flanks are designed with a controlled projection distance (0.010×P to 0.020×P) to alter the meshing sequence and reduce chordal motion, thereby decreasing impact noise and vibration while maintaining power transmission capability
Solution Approach 2:
The patent introduces dynamic control of chain-sprocket engagement by sequencing the contact of different chain toes with sprocket teeth. The inside flanks are designed to make initial contact followed by outside flanks, creating a controlled dynamic meshing process that reduces impact forces compared to conventional simultaneous engagement
2Object-affected harmful factors
If chain is forced out of straight line path to compensate for vibration, then vibration is addressed, but chordal motion increases to no more than 40% of maximum chordal rise distance
Solution Approach 1:
The patent changes the geometric parameters of chain link toes, specifically the projection distance of inside flanks (0.010×P to 0.020×P), to control the meshing sequence and reduce chordal motion while maintaining chain stability and straight line path
3Object-generated harmful factors
If maximum inside flank projection of 0.010×P to 0.020×P is used, then chordal motion is reduced to no more than 40% of maximum chordal rise distance, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies an optimized range for inside flank projection (0.010×P to 0.020×P) that balances chordal motion reduction with manufacturability. This parameter range achieves sufficient noise and vibration reduction while remaining feasible for conventional manufacturing processes
Data Source
AI summary
An inverted tooth chain includes a plurality of rows. The inside flanks of the leading toes of each chain row project outwardly relative to the outside flanks of the trailing toes of the preceding chain row by a maximum amount λMAX wherein: 0.010×P≦λMAX≦0.020×P or, preferably, 0.015×P≦λMAX≦0.020×P, where P =chain pitch. The inverted tooth chain is meshed with a sprocket to define a system having a maximum chordal rise distance CR wherein said chordal motion in the inverted tooth chain upstream relative to said sprocket is less than 40% of said maximum chordal rise distance CR.