Rubber Crawler Guide Rubber Heat Reduction
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Solution Overview
Problem
Rubber crawlers with existing compositions experience reduced lifespan due to heat generation from friction between the drive wheel and guide rubber, and inadequate abrasion and scratch resistance, leading to premature degradation.
Innovation Solution
A rubber crawler design featuring a guide rubber composition with a specific blend of butadiene rubber, natural rubber, isoprene rubber, and carbon black, and an inner peripheral rubber composition with styrene-butadiene rubber and carbon black, optimized for reduced heat generation, enhanced abrasion resistance, and improved adhesiveness between the guide and inner peripheral rubbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guide rubber using the rubber composition as described in PTL 1 is fabricated, then abrasion resistance and crack resistance are improved, but heat generation from contact with the drive wheel increases and service life is impaired
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber by specifying precise ranges of polybutadiene rubber (5-40% with specific molecular weight distribution and cis-1,4 bond content) and diene-based rubber (95-60% by mass). These parameter adjustments optimize the balance between abrasion resistance and heat generation, resolving the contradiction by fine-tuning the rubber's viscoelastic properties to reduce energy loss as heat while maintaining durability.
Solution Approach 2:
The patent creates a composite rubber material combining multiple rubber types (polybutadiene rubber with specific molecular weight distribution, diene-based rubber) in precise proportions. This composite approach allows the guide rubber to simultaneously achieve high abrasion resistance from the polybutadiene component while controlling heat generation through the diene-based rubber component, thus resolving the technical contradiction.
2Duration of action of stationary object
If the guide rubber composition is optimized for reduced heat generation, then service life is improved, but abrasion resistance may be compromised
Solution Approach 1:
The patent specifies precise parameter ranges for the rubber composition, including polybutadiene rubber content (5-40%) with controlled molecular weight distribution (Mw/Mn = 1.6-3.5) and cis-1,4 bond content (98% or more). These parameter optimizations ensure the rubber achieves both reduced heat generation for extended service life and sufficient abrasion resistance for reliable operation.
Solution Approach 2:
The patent applies local quality by specifying different rubber component ratios and properties for different functional requirements within the guide rubber. The polybutadiene rubber component provides abrasion resistance, while the diene-based rubber component controls heat generation, allowing the single guide rubber to simultaneously achieve both durability aspects without compromise.
3Reliability
If carbon black with high nitrogen adsorption specific surface area is used, then abrasion resistance is improved, but heat generation increases
Solution Approach 1:
The patent specifies precise parameters for carbon black selection, including nitrogen adsorption specific surface area and dibutyl phthalate absorption values. By controlling these parameters, the patent optimizes the carbon black's reinforcing effect for abrasion resistance while managing its impact on heat generation, resolving the contradiction between durability and thermal performance.
Solution Approach 2:
The patent applies local quality by selecting carbon black with specific surface area and absorption characteristics that provide localized reinforcement where needed for abrasion resistance, while maintaining overall heat generation at acceptable levels through careful material selection and composition control.
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 solution effectively reduces heat generation, enhances abrasion and scratch resistance, and improves adhesiveness, resulting in a longer-lasting rubber crawler with improved performance.
Implementation Method 1
the guide rubber that is reduced in heat generation to be caused due to contact and abrasion between a drive wheel of a machine body and a rolling wheel
Implementation Method 2
contact and abrasion between a drive wheel of a machine body and a rolling wheel
Implementation Method 3
a guide rubber obtained by crosslinking a specified guide rubber composition and an inner peripheral rubber obtained by crosslinking a specified inner peripheral rubber composition
Data Source
AI summary
Provided is a rubber crawler including a guide rubber that is reduced in heat generation and excellent in abrasion resistance and an inner peripheral rubber that is excellent in scratch resistance and abrasion resistance and having excellent adhesiveness between the guide rubber and the inner peripheral rubber.The rubber crawler of the present invention includes a guide rubber obtained by crosslinking a guide rubber composition and an inner peripheral rubber obtained by crosslinking an inner peripheral rubber composition, the guide rubber composition containing a rubber component (A) and a carbon black (B), the rubber component (A) containing a butadiene rubber and at least one selected from a natural rubber and isoprene rubber, and containing 50 to 80% by mass of the natural rubber and the isoprene rubber and 20 to 50% by mass of the butadiene rubber, the carbon black (B) containing a carbon black (B-1) having an N2SA of 60 to 125 m2/g and a DBP absorption of less than 130 mL/100 g and a carbon black (B-2) having an N2SA of less than 60 m2/g and a DBP absorption of 110 mL/100 g or more, and a total content of the carbon black (B-1) and the carbon black (B-2) is 25 to 65 parts by mass based on 100 parts by mass of the rubber component; the inner peripheral rubber composition containing a rubber component (a) and a carbon black (b), the rubber component (a) containing 60 to 100% by mass of SBR and 0 to 40% by mass of a diene-based rubber other than the styrene-butadiene rubber, and a carbon black in an amount of 50 to 70 parts by mass based on 100 parts by mass of the rubber component.