The Jenwyn Tech JEA55-73-S1-01 is an integrated 5.5t electric drive axle engineered for commercial vehicle platforms with a design axle load of 5.5 t to 6.5 t.
Our 5.5t electric drive axle system integrates the traction motor, reduction gearbox, and axle housing into a single assembly weighing approximately 480 kg. Currently in volume series production, the axle is primarily applied in 7–8 metre buses and light-duty logistics trucks.
1. Integrated Architecture & Chassis Layout Advantages
The 5.5t electric drive axle integrates the electric motor, reduction gearbox, and axle assembly into a unified structure. By shifting propulsion directly to the rear axle, the system eliminates several conventional drivetrain components:
- Eliminates intermediate components: Removes the propeller shaft (driveshaft), separate transmission, and clutch.
- Reduces vehicle component count: Fewer mechanical parts streamline assembly and improve overall transmission efficiency.
- Simplifies chassis packaging: Eliminates the need to design around driveline inclination angles (universal joint angles), creating more usable space within the chassis frame.
- Lightweight design: Lowers total vehicle curb weight, which directly enhances the vehicle’s effective payload capacity.
2. Mechanical & Powertrain Performance
The 5.5t electric drive axle provides the torque and power required for typical daily commercial logistics and passenger transit duty cycles.
- Motor Output: Delivers a rated power of 73 kW (peak power of 160 kW) and a rated torque of 203 Nm (peak torque of 550 Nm).
- Motor Speed: Operates at a rated speed of 3,800 rpm with a maximum speed of 12,000 rpm.
- Dual Reduction Ratios: Available in two factory gear ratios to match specific operational requirements:
- 15.52:1 Ratio: Provides a maximum output torque of 8,536 Nm.
- 12.68:1 Ratio: Provides a maximum output torque of 6,974 Nm.
- Mechanical Differential: Utilizes a standard mechanical differential, providing reliable differential performance while minimizing control complexity for the vehicle’s electronic control system.
- Thermal & Lubrication Design: Engineered with effective internal lubrication and a large housing surface area for heat dissipation.
3. Key Technical Specifications
| Item | Parameter |
|---|---|
| Product Model | JEA55-73-S1-01 |
| Drive Configuration | Rear-Wheel Drive (RWD) |
| Rated Payload Capacity | 5.5 tonnes |
| Designed Axle Load | 5.5 t – 6.5 t |
| Total System Weight | Approx. 480 kg |
| Rated / Peak Motor Power | 73 kW / 160 kW |
| Rated / Peak Motor Torque | 203 Nm / 550 Nm |
| Rated / Max Motor Speed | 3,800 rpm / 12,000 rpm |
| Reduction Ratios | 15.52:1 or 12.68:1 |
| Maximum Output Torque | 8,536 Nm (at 15.52) / 6,974 Nm (at 12.68) |
| Brake Specification | 17.5-inch Disc Brake |
| Brake Actuation Options | Pneumatic (Air Brake) or Hydraulic |
| Wheel Bolt Circle (PCD) | Φ205 mm / Φ222.25 mm |
| Production Status | Volume series application |
4. Braking Configuration & Homologation Flexibility
The JEA55-73-S1-01 5.5t electric drive axle is equipped with 17.5-inch disc brakes and can be configured with either pneumatic (air) or hydraulic actuation.
Braking compatibility is a critical consideration when integrating an electric axle into an existing vehicle platform, as demonstrated by practical project requirements in regulated markets such as the United States:
The Regulatory Context: FMVSS Compliance
In the United States, all on-road vehicles must comply with Federal Motor Vehicle Safety Standards (FMVSS). Braking systems are governed by specific standards based on the braking mechanism:
The Cost of Altering the Braking Architecture
Converting an existing chassis certified with hydraulic disc brakes to an air brake system changes the applicable regulatory standard. This requires a full vehicle re-certification process, including:
- Brake dynamometer testing
- Full-vehicle stopping distance testing
- Parking brake grade holding tests
- Platform-specific ABS validation
Completing this re-homologation typically requires 12 to 24 months and a budget on the order of millions of dollars before the first vehicle can be sold.
The Advantage of Retaining Hydraulic Disc Brakes
If a customer’s target chassis is already certified with a hydraulic disc brake system, equipping our 5.5t electric drive axle with hydraulic disc brake wheel ends allows the manufacturer to maintain their existing certification baseline. This eliminates the need for a new brake certification program, enabling immediate order execution and deployment.
5. Manufacturing Base & Validation Capabilities
To ensure manufacturing precision, consistency, and long-term reliability for volume series supply, the production base operates as a digitalized, intelligent manufacturing facility equipped with advanced production machinery and automated process controls.
Automated Production & Process Traceability
- High-Precision Tooling: The facility integrates multiple flexible machining lines, imported automatic friction welding machines, laser welding systems for seamless component joining, and imported final drive assembly lines.
- Dedicated Gear Plant: Features a dedicated gear manufacturing facility covering nearly 8,000 square metres.
- End-to-End Automation & Traceability: Automated systems manage scheduling and material distribution with minimal manual intervention. Each axle carries a serialized QR code, enabling complete digital traceability throughout the manufacturing process.
- Production Capacity: Phase I of the new energy vehicle axle base is built to support an annual capacity of 80,000 electric drive axle assemblies.
Comprehensive Validation & Testing Center
Product verification is supported by a dedicated 6,400 square metre testing center representing a total investment of RMB 350 million, with individual high-end test benches valued at over RMB 20 million.
The testing center provides comprehensive validation across three core axle functions:
- Structural Support: Bench testing for chassis load capacity and structural durability.
- Power Transmission: Driveline performance and efficiency validation across varied operating cycles.
- Braking Performance: Dedicated validation for pneumatic and hydraulic braking systems.
Equipped to simulate diverse real-world operating conditions, the facility rigorously conducts chassis load-bearing trials, dynamic endurance tests, and NVH evaluations. Guided by a strict quality principle displayed across the facility—”The later a defect is identified, the higher the cost of quality correction”—every unit is engineered to meet stringent commercial vehicle standards prior to delivery.
Discuss Your Electric Drive Axle Requirements
Looking for an electric drive axle for a bus, logistics truck or other commercial EV platform?
Email us at contact@jenwyntech.com or fill out the inquiry form below to discuss your project requirements.