Technical Specifications of Conventional Railway Bogies
(Key Parameters and Design Standards)
1.Structural Design & Configuration
- Type:
- Common designs: 2-axle rigid frame bogie (e.g., Y25, BT-10), 3-axle bogie for heavy freight.
- Articulated bogies for high-speed trains (e.g., SGP 400 used in ICE).
- Suspension System:
- Primary suspension: Coil springs + hydraulic dampers; vertical stiffness range: 8–15 MN/m.
- Secondary suspension: Air springs or rubber-metal composites; lateral stiffness: 3–6 MN/m.
- Wheelbase:
- Standard: 1,800–2,500 mm (freight), 2,500–3,000 mm (passenger).
- High-speed variants: Extended to 3,200 mm for stability.
2. Material & Manufacturing Standards
- Frame Material:
- Cast steel (EN 15085 compliance) or welded steel alloy (e.g., S355J2G3).
- Lightweight designs: Aluminum alloy (e.g., 6005A-T6) or composite materials for high-speed applications.
- Axle Material:
- EA4T/EN 13261 forged steel, heat-treated for fatigue resistance.
- Surface hardness: 250–300 HB.
3. Performance Parameters
- Axle Load Capacity:
- Freight bogies: 22.5–32.5 tons/axle (UIC 530-2 standard).
- Passenger bogies:17–22 tons/axle.
- Speed Ratings:
- Conventional freight: ≤120 km/h.
- Passenger coaches:160–200 km/h.
- High-speed:≥250 km/h (e.g., FLEXX Eco bogies by Bombardier).
- Braking System:
- Disc brake diameter:640–750 mm(EN 14535 compliant).
- Brake shoe material:cast iron** or composite sintered pads.
4.Critical Dimensions & Tolerances
- Wheel Diameter:
- New wheels: 840–915 mm (freight),860–920 mm(passenger).
- Minimum allowable after wear: 760 mm(UIC 510-3).
- Gauge Width:
- Standard: 1,435 mm (ISO 1005-1), with tolerance ±3 mm.
- Bogie Height:
- Floor-to-rail height: 1,000–1,200 mm (adjustable via suspension).
5. Maintenance & Compliance
- Inspection Intervals:
- Routine checks: Every 30,000–60,000 km (visual inspection of bolts, springs).
- Overhaul cycle: 1.2–1.5 million km (disassembly for axle bearing replacement).
- Standards Compliance:
- UIC 615-4(dynamic performance),EN 13749 (structural strength).
- ISO 1005 Series (material and component specifications).
Application Notes
- Freight Bogies: Prioritize high axle load tolerance and low maintenance costs; commonly use 3-piece bogies in North America (AAR M-976).
- Passenger Bogies: Focus on ride comfort (NMV ≤ 2.5, per UIC 513) and noise reduction (< 75 dB at 200 km/h).
- Retrofitting: Compatibility with ETCS/ATP systems for modernized fleets.
