Dongfeng LoongGine Engine parts Generator assembly 3701010-E4203

As the primary power supply component of the vehicle’s electrical system, this generator assembly’s core function is to convert the engine’s mechanical energy into electrical energy to power on-board electrical equipment (e.g., lights, air conditioning, ECU) and charge the vehicle battery. It operates based on the electromagnetic induction principle:

The engine’s crankshaft drives the generator’s pulley via a V-belt, rotating the generator’s rotor (equipped with permanent magnets or field coils).

The rotating rotor creates a changing magnetic field in the stator (wound with three-phase copper coils), inducing alternating current (AC) in the stator windings.

The built-in rectifier (composed of silicon diodes) converts AC to direct current (DC), while the integrated voltage regulator stabilizes the output voltage at 13.5-14.5V DC (for 12V electrical systems) or 27-29V DC (for 24V systems)—preventing overcharging of the battery and protecting sensitive electrical components from voltage fluctuations

Designed to meet the high-power demands of commercial vehicles and machinery, the generator assembly boasts excellent performance and efficiency:

Rated Power Output: Delivers a stable rated power of 1500W-2000W (depending on configuration), fully supporting the electrical load of heavy-duty vehicles (e.g., simultaneous operation of air conditioning, headlights, and GPS systems) without voltage drop.

Speed Adaptability: Maintains rated power output at engine speeds ranging from 1500 rpm (idle) to 6000 rpm (maximum speed), ensuring consistent power supply during both low-speed idling and high-speed driving.

Energy Conversion Efficiency: Achieves a conversion efficiency of ≥85% under rated load conditions—higher than the industry average (80-82%)—reducing the mechanical load on the engine and improving overall fuel efficiency.

Temperature Stability: Operates normally at ambient temperatures from -40℃ to 120℃, with the internal temperature control system preventing overheating via a built-in fan and heat-dissipating aluminum housing

The assembly features a robust structural design and premium materials to withstand harsh operating environments:

Housing & Rotor/Stator: The outer housing is made of high-strength aluminum alloy (ADC12) for lightweight (reducing engine load) and excellent heat dissipation. The rotor shaft uses 40Cr alloy steel (heat-treated to HRC 50-55) for high torsional strength, while the stator windings are made of oxygen-free copper wire (with insulation class H, resistant to 180℃) to prevent wire aging and short circuits.

Bearing & Sealing: Equipped with double-row deep groove ball bearings (from reputable brands like SKF or NSK) with a service life of over 30,000 hours, ensuring smooth rotation and low noise. The front and rear end covers use oil seals with nitrile rubber lips to prevent dust, water, and engine oil ingress—meeting IP54 dustproof and waterproof standards.

Anti-Vibration Design: The mounting brackets are equipped with rubber damping pads to absorb vibration from the engine, reducing stress on the generator’s internal components and extending service life

The generator assembly is widely applied in Dongfeng LoongGine-powered vehicles and machinery, including:

Dongfeng heavy-duty trucks for long-distance cargo transportation (relying on stable power for on-board electronics and battery charging during extended trips);

Medium-duty trucks and buses (supporting high electrical loads from passenger air conditioning, lighting, and safety systems);

Engineering machinery (e.g., excavators, loaders) operating in dusty, high-vibration construction sites—requiring durable power supply components.

In terms of installation, it offers distinct advantages:

Direct OEM Replacement: Matches the original generator’s dimensions, pulley specifications, and mounting points—no modifications to the engine’s front-end drive system or wiring harness are needed. Installation can be completed with standard tools (e.g., socket wrench, belt tensioner tool) in 40-60 minutes.

Pre-Configured Components: The assembly comes fully assembled with the rectifier, voltage regulator, pulley, and electrical connector—eliminating the need for separate component installation and reducing the risk of assembly errors.

Low Maintenance: Under normal use (with regular belt inspection), the assembly has a service life of over 100,000 km, reducing the frequency of replacement and lowering maintenance costs for fleet operators and repair shops