RHC7 1144002100 Excavator Turbocharger EX200-1 Hitachi Turbocharger

The turbocharger of an excavator is an exhaustactuated air compressor installed onto the engine block. Its core operational logic is using waste exhaust gas energy to compress intake air, which optimizes diesel combustion efficiency, greatly increasing power output, cutting fuel consumption and minimizing black smoke emissions.

Core Functions

Power Enhancement PerformanceFor engines of equal swept volume, turbocharging increases power by 30%–50% with remarkable torque growth, supporting powerful heavyload and uphill working performance.

Fuel Conservation & Emission Mitigation BenefitsAdequate air intake enables full fuel combustion, reducing fuel usage by roughly 5% and lowering black smoke, CO and hydrocarbon emission outputs.

LowRPM Torque Improvement FunctionHigher lowspeed torque delivers greater traction force for excavator heavyload startup and digging activities.

Basic Structure (Three Main Functional Modules)

Turbine Section (Exhaust Side Unit)Linked to the exhaust manifold, hightemperature exhaust gas ranging 600–900 ℃ strikes the turbine impeller, spinning the main shaft at 100,000–200,000 rpm.

Compressor Section (Intake Side Unit)Coaxially driven, the compressor wheel compresses air filtered by the air cleaner and feeds boosted air into engine cylinder assemblies.

Center Bearing Housing (LubricationCooling Module Unit)Featuring floating bearings and engineoil lubricationcooling flow passages, it endures extreme heat and ultrafast rotational speeds. Engine oil dissipates heat to avoid bearing seizure failures.

Working Principle (4Stage Operation Cycle)

Exhaust Gas Impulse Driving PhaseHighheat highpressure exhaust flows into the turbine casing and rotates the turbine wheel rapidly.

Coaxial Synchronous Supercharging PhaseThe turbine shaft drives the compressor impeller to spin at matching high rotational velocity.

Intake Air Pressurization PhaseThe compressor draws in filtered ambient air and compresses it to 0.1–0.2 MPa with increased air temperature.

Intercooler Heat Reduction PhaseHeated compressed air is cooled by the intercooler to boost air density, then enters cylinders for increased fuel injection and higher power output.