V-Ribbed Belt Compression Layer Segmentation for Slip Noise Reduction
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Solution Overview
Problem
Existing V-ribbed belts face challenges in reducing slip noise and maintaining power transmission capacity, especially in wet conditions, due to inadequate noise reduction and potential reduction in power transmission efficiency.
Innovation Solution
A V-ribbed belt design featuring a compression rubber layer with a surface rubber layer having numerous pores and an inner rubber layer with a higher storage modulus, which reduces slip noise and maintains power transmission capacity in wet conditions by balancing wear resistance and bending fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a porous rubber composition is used for the compression rubber layer to reduce slip noise, then noise reduction is improved, but power transmission capacity deteriorates
Solution Approach 1:
The compression rubber layer is divided into two distinct layers: a surface rubber layer with pores for noise reduction and an inner rubber layer with higher storage modulus for power transmission. This segmentation allows each layer to specialize in one function, resolving the contradiction between noise reduction and power transmission capacity.
Solution Approach 2:
Different regions of the compression rubber layer are given different properties: the surface rubber layer has low storage modulus (20-40 MPa) with pores for noise reduction, while the inner rubber layer has high storage modulus (30-50 MPa) for power transmission. This local differentiation of material properties resolves the contradiction by optimizing each region for its specific function.
2Power
If the storage modulus of the compression rubber layer is increased to maintain power transmission capacity, then power transmission is improved, but slip noise increases
Solution Approach 1:
The compression rubber layer is segmented into surface and inner layers with different storage moduli. The surface layer has lower storage modulus to reduce slip noise, while the inner layer has higher storage modulus to maintain power transmission capacity, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
The surface rubber layer is designed with specific local quality (lower storage modulus and porous structure) for noise reduction, while the inner rubber layer has different local quality (higher storage modulus) for power transmission. This local quality differentiation allows the belt to simultaneously achieve noise reduction and power transmission.
3Object-generated harmful factors
If pores are formed on the pulley contact surface to reduce slip noise, then noise reduction is improved, but wear resistance deteriorates
Solution Approach 1:
The compression rubber layer is segmented into a surface rubber layer containing pores for noise reduction and an inner rubber layer providing structural support and wear resistance. This segmentation protects the porous surface structure from direct wear while maintaining noise reduction functionality.
Solution Approach 2:
The surface rubber layer has local quality optimized for noise reduction (porous structure, lower storage modulus), while the inner rubber layer has local quality optimized for wear resistance (higher storage modulus, denser structure). This local quality differentiation resolves the contradiction between noise reduction and wear resistance.
4Power
If the storage modulus of the surface rubber layer is increased to improve power transmission, then power transmission is improved, but bending fatigue resistance deteriorates
Solution Approach 1:
The surface rubber layer has lower storage modulus (20-40 MPa) optimized for bending fatigue resistance and noise reduction, while the inner rubber layer has higher storage modulus (30-50 MPa) optimized for power transmission. This local quality differentiation resolves the contradiction between power transmission and bending fatigue resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces slip noise and maintains power transmission capacity in wet conditions, enhancing the performance of V-ribbed belts in engine room applications.
Implementation Method 1
a surface rubber layer including numerous pores on a pulley contact surface
Implementation Method 2
reduces slip noise and maintains power transmission capacity
Implementation Method 3
transmits power between pulleys upon coming into contact with the pulleys
Data Source
AI summary
A vehicle periphery monitoring system is provided, in which by matching a behavior of a semitransparent tire image with an operation from a driver's viewpoint, a feeling of strangeness is reduced, an intuitive space perception is assisted and also a moving direction and a behavior of a vehicle can be easily perceived. In a side-view monitor system an image processing controller converts a real camera image including a blind spot into an image to be viewed from a driver's viewpoint to generate a blind spot image, and superimposes a semitransparent vehicle image which is obtained by making a vehicle viewed from the driver's viewpoint semitransparent and a semitransparent tire image which is obtained by making a tire semitransparent and displaying a behavior following a handle operation viewed from the driver's viewpoint on the blind spot image.