DF551S-D | Bus steering axle
The Dongfeng DANA Coach Axle DF551S-D is a high-performance I-beam steering axle based on the F5.5-D platform with a rated load of 5500kg. It comes standard with an air brake system (φ400×150 special brake drum, compatible with 22.5″ wheel flange).
Supports precise adjustment of wheelbase width from 2,424 to 2,510 mm, with flexible adaptation of rim mounting distance from 2,059 to 2,398 mm; Fixed kingpin center distance of 1,870.9 mm enhances steering rigidity, while a 130 mm ultra-large front axle drop (the highest in the series) significantly improves off-road maneuverability;
7° kingpin inclination angle/1° camber angle optimize handling stability, with a 40° outer wheel steering angle; Compatible with 8.25×22.5 heavy-duty wheel rims and 11.00R22.5 wide-base tires, 10-M22×1.5 high-strength bolts combined with a φ335 bolt distribution circle ensure load-bearing safety, air chamber interfaces compatible with NPT1/4/M16×1.5/Z1/4 three standards, optional maintenance-free hub units.
We provide full life cycle services for all customers, from design to power system supply, from installation to commissioning, from after-sales service training to spare parts supply, from trouble shooting to overhaul technical support.
DF551S-D Product Features
Electric Drive Heavy-Duty: Specifically designed for pure electric/hybrid buses, with a load capacity range of 5.5 to 7.5 tons, peak torque output increased by 40%, suitable for intercity/BRT heavy-duty scenarios.
All-around quiet operation: Electric drive-specific gears + active noise reduction system, NVH optimization of 50%, driving noise ≤60dB (urban conditions).
Intelligent electric control braking: Integrated EBS+ESP+energy recovery system, response time ≤0.1s, braking recovery efficiency >20%, supports optional electromagnetic retarder.
Extended maintenance-free operation: IP6K9K fully sealed design + intelligent temperature-controlled lubrication, key components (bearings/motor shaft) lifespan ≥ 800,000 kilometers, maintenance interval exceeding 100,000 kilometers.
Technical Specifications
| Category: | Steering axle |
| Platform: | DF551S-D |
| Basic Structure: | I-beam |
| Rated Load (kg): | 5500 |
| Brake Structure/Specifications: | Air brake/φ400×150、22.5″ |
| Maximum External Width A (mm): | 2424-2510 |
| Rim Installation Distance B (mm): | 2059-2398 |
| Kingpin Center Distance C (mm): | 1870.9 |
| Spring Distance D (mm): | 930-1180 |
| Front Axle Drop (mm): | 130 |
| Kingpin Inclination/Wheel Camber: | 7°/1° |
| Inner Wheel Steering Angle/Outer Wheel Steering Angle: | 40° |
| Rim: | 8.25×22.5 |
| Tire: | 11.00R22.5 |
| Wheel Bolts: | 10-M22×1.5 |
| Wheel Bolt Circle E (mm): | φ335 |
| Wheel Toe (mm): | 1 – 3 |
| Air Chamber Interface Dimensions: | NPT1/4、Z1/4、M16×1.5 |
| Optional Information: | Maintenance-Free Hub Unit |
| Lead Time: | 15 – 30 Working Days |
Model | Rated Load (Kg) | Brake Structure Form/Specification | Maximum Overall Width A (mm) | Rim | Tire | Wheel Bolt |
| DF551S-D | 5500 | Air brake/φ400×150、22.5″ | 2424 – 2510 | 8.25×22.5 | 11.00R22.5 | 10 – M22×1.5 |
| DF651S-D | 6500 | Air brake/φ400×150、22.5″ | 2485 – 2504 | 8.25×22.5 | 11.00R22.5 | 10 – M22×1.5 |
| DF701S-D | 7500 | Air brake/22.5″ | 2491 | 8.25×22.5 | 275/70R22.5 | 10 – M22×1.5 |
| ——END—— | ||||||
Basic information of bus steering axle | |||
| Category | Steering Axle | Basic Structure Form | I – beam |
| Rim Mounting Distance B (mm) | 2059 – 2398 | Kingpin Center Distance C (mm) | 1870.9 |
| Spring Distance D (mm) | 930 – 1180 | Front Axle Drop (mm) | 130 |
| Kingpin Inclination Angle/Wheel Camber Angle | 7°/1° | Inner Wheel Steering Angle/Outer Wheel Steering Angle | 40° |
| Wheel Bolt Distribution Circle E (mm) | φ335 | Wheel Toe – in (mm) | 1-3 |
| Air Chamber Interface Size | NPT1/4、M16×1.5、Z1/4 | Optional Information | Maintenance – free Hub Unit |
| ——END—— | |||

Note: All Above Data are Just for Reference, All Data Might Change Without Notices or Updates, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.

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