Detailed Introduction
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Composite Brake Pads for Railway Passenger Coaches-Technical Specifications
Material Composition&Structure
Friction Material:
Matrix:Thermoset phenolic resin(15-25%)
Reinforcements:
?Aramid fibers(10-15%)
?Glass fibers(8-12%)
Friction modifiers:
?Graphite(5-8%)
?Antimony trisulfide(3-5%)
Fillers:
?Alumina(15-20%)
?Calcium carbonate(10-15%)
Backing Plate:
?Material:S355JR high-strength steel
?Thickness:6-8mm
?Surface treatment:Zinc-aluminum coating(50μm)
Design Features
Standard dimensions:200×80×30mm(typical)
Surface geometry:
?Cross-drilled cooling holes(?5mm)
?Laser-cut grooves(depth 2mm,width 3mm)
?Chamfered edges(45°)
Working Principle
When braking is initiated:
Hydraulic pressure(15-20MPa)activates caliper
Pads contact disc at 0.8-1.2N/mm2pressure
Kinetic energy converts to heat(peak 400-600°C)
Friction coefficient maintains 0.38±0.03
Technical Advantages
|Characteristic|Performance Data|
|Friction Stability|μvariation<5%(50-350km/h)|
|Wear Resistance|≤0.08cm3/MJ(UIC 541-5)|
|Noise Level|<72dB(A)80km/h|
|Environmental|Asbestos-free,RoHS compliant|
|Weight Saving|40%lighter vs cast iron|
Maintenance Protocol
Inspection:
Visual check every 10,000km
Thickness measurement(minimum 5mm)
Thermal imaging for hot spots
Replacement:
Standard interval:80,000-120,000km
Must use matched pairs(LR/HR)
Installation:
Clean mounting surface(Sa2.5)
Apply copper-free antiseize compound
Torque bolts to 85±5Nm
Certification&Standards
EN 14535-1:2015(Railway applications)
UIC 541-4 Brake performance
ISO 26865:2013 Noise testing
Note:Optimal performance requires:
Proper bedding-in(200-300 brake applications)
Compatible brake disc material(EN 15663)
Regular brake fluid replacement(DOT 4+)
Current technical evolution includes:
Embedded RFID chips for wear monitoring
Graphene-enhanced friction materials
Self-diagnosing sensor pads(IoT enabled)
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