125/250kW Central E-axle (rear/Mid-axle) for electric tractor
Advantage
Advantage 1: Control strategy advantage
Torque assist can realize power without interrupting gear shifting;
It can realize heavy-load ramp-up shifting and improve operational efficiency; Optimize the control strategy and improve driving comfort;
Advantage 2: Excellent power performance
The total power of the system is up to 440KW;
The maximum climbing degree of the 49T tractor is more than 35%;
The maximum speed can reach 125km/h;
Advantage 3: Cost advantage
The use of 300,000 kilometers of long-lasting oil, the use of maintenance-free bearings at the end of the wheel, lower maintenance costs;
The assembly has high efficiency, low power consumption and lower operating costs;
The service life of system B10 can reach 1 million kilometers, which is more worry-free to use;
Pumbaa PMEA40000Z Central E-axle (rear/Mid-axle) Matching vehicle type： tractor
Pumbaa PMEA40000Z Central E-axle (rear/Mid-axle) Technical parameters
Rated axle load(kg) |
13000 |
Axle housing forming method |
Stamping and welding |
Housing cross-section(mm) |
135×150×16 |
Gearbox ratio |
13.203/4.367 |
Wheel ratio |
3.947 |
Nominated/peak output torque(Nm) |
320/820 |
Rated/peak power(kw) |
125/250 |
Maximum speed(rpm) |
11000 |
Motor dimensions（mm） |
Φ354×270 |
Leaf spring mounting distance(mm) |
1040 |
Rim mounting distance(mm) |
1875 |
Overall width(mm) |
2420 |
Brake specifications |
Drum pose/φ410×220 |
Air chamber size/connection size(mm) |
30/24 M16×1.5 |
Maximum braking torque(0.8MPa) |
2×18000Nm |
Wheel bolt specifications |
2-10×M22×1.5 |
Wheel bolts are distributed in a circle diameter(mm) |
Φ335 |
Locate the stop(mm) |
Φ280.8 |
Assembly weight(kg) |
1030 |
Pumbaa PMEA40000Z Central E-axle (rear/Mid-axle) Application examples
Small batches are used in Sany Heavy Truck, Baidu Commercial Vehicle (Deepway), Foton Daimler, Zero One Smart Card, etc.
Product R&D process
Central e-axle test:
Noise test of electric bridge bench
Durability test of electric drive bridge bench
Assembly air tightness test
Vibration test of electric bridge platform
Road testing of the whole vehicle
Customer loading test
The Battle for Breakthrough in Electric Drive Axles: A "Power Revolution" from Decentralization to Integration
Abstract
The electric drive axle (eAxle), the "power hub" of electric vehicles (EVs), is undergoing a technological breakthrough from "decentralized components" to "highly integrated systems." This paper analyzes its technical challenges, breakthrough paths, and future trends, revealing how it drives EVs toward "greater efficiency and smarter intelligence."
1. Introduction
Global EV penetration exceeded 18% in 2024, with the electric drive axle (eAxle) emerging as the "power heart" whose technological advancements directly impact range, performance, and safety—key drivers of industrial upgrading.
2. Technical Challenges: Three Bottlenecks of Decentralized Design
Traditional eAxles use a "motor + inverter + reducer" decentralized layout, facing:
● Large size: Accounting for 15%-20% of vehicle weight (early solutions);
● High cost: Independent component procurement + assembly, costing over 30% of total;
● Low efficiency: Energy loss up to 15% (copper + magnetic losses).
（Structural Diagram of Electric Drive Axle）
3. Technological Breakthroughs: Four Leaps from Decentralization to Integration
3.1 High Integration: Reducing Size and Cost
Through "integrated die-casting + modular design," eAxles now integrate motors, inverters, and reducers into a single housing (e.g., Huawei DriveONE, Tesla eAxle), reducing volume by 40% and cost by 25% (e.g., XPeng G6 eAxle).
3.2 Wide-Bandgap Devices: Efficiency Surpassing 97%
SiC/GaN replaces silicon-based IGBTs, cutting conduction losses by 50% and increasing switching frequency 10x (e.g., Porsche Taycan eAxle), achieving 97% system efficiency and extending range by 10%.
3.3 800V High-Voltage Adaptation: Balancing Ultra-Fast Charging and Performance
Supporting 800V high-voltage platforms (e.g., XPeng G9, Porsche Taycan), eAxles match 250kW ultra-fast chargers, enabling 300km range top-up in 10 minutes, while reducing current ripple (<2%)
3.4 Intelligent Synergy: Deep Integration with Autonomous Driving
Equipped with sensors (current/temperature/position) and communication modules (CAN/Ethernet), eAxles receive autonomous driving commands (e.g., "accelerate to 80km/h in 2 seconds") and pre-adjust torque output (e.g., Tesla FSD eAxle) with <10ms latency.
(Electric Drive Axle Technology)
4. Future Trends: From "Power Unit" to "Mobile Energy Storage Node"
By 2027, mainstream eAxles will:
● Achieve power density exceeding 6000W/kg (current 4000W/kg);
● Integrate V2G (vehicle-to-grid) functionality for grid balancing (e.g., Germany’s V2G pilot);
● Adopt AI for intelligent control (e.g., predictive energy management via NPU).
( Electric Drive Axle)
Conclusion
Breakthroughs in electric drive axles are driving EVs from "mechanical propulsion" to "intelligent energy nodes." With future advancements in integration, wide-bandgap devices, and AI, eAxles will emerge as the core hub for "power + energy storage + intelligence," supporting global carbon neutrality goals.
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