VW/Audi Group (1.9 TDI, 2.0 TDI, etc.)
Some Mercedes-Benz & BMW diesel models (verify compatibility before purchase)
The Bosch fuel injector 0445110917 is a solenoid-controlled common rail diesel injector designed for high-pressure direct injection systems. Below are its key structural characteristics:
1. Main Components & Structure
A. Nozzle Assembly (Injection Tip)
Multi-hole nozzle (typically 5-7 precision-drilled holes) for fine fuel atomization.
Needle valve controlled by hydraulic pressure and solenoid actuation.
Tight sealing to prevent fuel leaks when closed.
B. Solenoid Actuator
Electromagnetic coil that opens the injector when energized.
Fast response time (typically <1 ms) for precise fuel metering.
High-force actuation to overcome rail pressure (up to 2,000+ bar in some systems).
C. Control Valve (Hydraulic Servo System)
Two-stage operation:
Solenoid opens a pilot valve, releasing control chamber pressure.
Hydraulic pressure lifts the needle for fuel injection.
Precision-machined surfaces for minimal leakage.
D. High-Pressure Connections
Common rail inlet (for high-pressure fuel supply).
Leak-off return line (returns excess fuel to the tank).
Sealing washers & O-rings (copper crush washer for rail connection, Viton seals for leak-off).
2. Material Composition
Body & Nozzle Holder: High-strength steel (hardened for durability).
Needle & Nozzle: Wear-resistant alloys (e.g., tungsten carbide-coated).
Solenoid Core: Ferromagnetic materials for rapid magnetic response.
Seals: High-temperature-resistant polymers (Viton, PTFE).
3. Key Functional Features
High-Pressure Tolerance: Designed for 1,600–2,500 bar rail pressure.
Precision Fuel Metering: Microsecond-level injection timing control.
Multi-Injection Capability: Supports pilot, main, and post injections for cleaner combustion.
Integrated Filter: Some models include a micro-filter to protect the nozzle.
Maintenance Tips
Use ultra-low-sulfur diesel (ULSD) to prevent deposits.
Replace fuel filters regularly to avoid contamination.
Clean injectors professionally (ultrasonic cleaning for severe deposits).
