Friction Transmission Belt Wet Slip Sound Reduction
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Solution Overview
Problem
Friction drive belts used in vehicle accessory systems experience 'stick-slip' and slip sound issues when wet, leading to noise generation, which existing technologies have not adequately addressed.
Innovation Solution
A friction transmission belt with a pulley contacting portion made of a rubber composition containing ethylene-α-olefin elastomer, mixed with 10-50 parts by mass of calcium carbonate and carbon black with a DBP oil absorption amount of 300 cm3/100 g or more, reducing slip sound even in wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon black is mixed in the rubber composition to improve friction and wear resistance, then wear resistance is improved, but slip sound and noise increase when the belt is wet
Solution Approach 1:
The patent uses a composite rubber composition containing both carbon black and hydrophilic inorganic filler (such as silica or alumina) to simultaneously achieve wear resistance and noise reduction. The carbon black provides friction and wear resistance, while the hydrophilic inorganic filler absorbs water and reduces slip sound, creating a synergistic effect that resolves the contradiction between wear resistance and noise generation.
Solution Approach 2:
The patent specifies precise parameter ranges for the rubber composition, including carbon black content (20-80 parts by mass per 100 parts rubber) and hydrophilic inorganic filler content (30-150 parts by mass per 100 parts rubber), along with specific DBP oil absorption values (120-200 cm³/100g). By optimizing these parameters, the composition achieves both wear resistance and noise reduction performance.
2Object-generated harmful factors
If hydrophilic inorganic filler is added to reduce slip sound when wet, then noise is reduced, but wear resistance may be compromised
Solution Approach 1:
The patent creates a composite rubber composition that combines hydrophilic inorganic filler for noise reduction with carbon black for wear resistance. The specific formulation (30-150 parts hydrophilic inorganic filler + 20-80 parts carbon black per 100 parts rubber) ensures that both functions are maintained simultaneously, with the carbon black compensating for any potential wear resistance loss from the inorganic filler.
Solution Approach 2:
The patent applies different filler materials to different functional requirements within the same rubber composition. The hydrophilic inorganic filler is optimized for noise reduction properties, while carbon black is optimized for wear resistance, with each component performing its specialized function in the composite material system.
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 belt effectively reduces slip sound and noise during operation, even when wet, while maintaining resistance to wear and heat, as demonstrated by the examples tested.
Implementation Method 1
carbon black whose DBP oil absorption amount measured according to the method A specified in Japanese Industrial Standards (JIS) K 6217-4 is 300 cm3/100 g or more are mixed
Data Source
AI summary
A belt body (10) of a friction transmission belt (B) includes a pulley contacting portion (13) made of a rubber composition. The rubber composition forming the pulley contacting portion (13) includes an ethylene-α-olefin elastomer as a rubber component, and in the rubber composition, 10-50 parts by mass of calcium carbonate relative to 100 parts by mass of the rubber component, and carbon black whose DBP oil absorption amount measured according to the method A specified in Japanese Industrial Standards (JIS) K 6217-4 is 300 cm3/100 g or more are mixed.