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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

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Model

Rated Load (Kg)

Brake Structure Form/Specification

Maximum Overall Width A (mm)

Rim

Tire

Wheel Bolt

DF551S-D5500Air brake/φ400×150、22.5″2424 – 25108.25×22.511.00R22.510 – M22×1.5
DF651S-D6500Air brake/φ400×150、22.5″2485 – 25048.25×22.511.00R22.510 – M22×1.5
DF701S-D7500Air brake/22.5″24918.25×22.5275/70R22.510 – M22×1.5
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Basic information of bus steering axle

CategorySteering AxleBasic Structure FormI – beam
Rim Mounting Distance B (mm)2059 – 2398Kingpin Center Distance C (mm)1870.9
Spring Distance D (mm)930 – 1180Front Axle Drop (mm)130
Kingpin Inclination Angle/Wheel Camber Angle7°/1°Inner Wheel Steering Angle/Outer Wheel Steering Angle40°
Wheel Bolt Distribution Circle E (mm)φ335Wheel Toe – in (mm)1-3
Air Chamber Interface SizeNPT1/4、M16×1.5、Z1/4Optional InformationMaintenance – free Hub Unit
——END——

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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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Sales Manager-Mrs.Wendy Fu

Spare Parts Sales-Miss. Nora Cao

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