PC60-7 Excavator Turbo 6271 - 81 - 8500 Aluminum Material For 4D95 Engine

49377 - 01760 / 6271 - 81 - 8500 Excavator Turbocharger PC60 - 7 / 8 Engine Turbo

Description

Turbochargers were originally known as turbosuperchargers because all forced induction devices are classified as superchargers. Technically, turbochargers are superchargers, however today, the term "supercharger" is typically applied only to mechanically driven forced induction devices. The key difference between a turbocharger and a conventional supercharger is that a supercharger is mechanically driven by the engine, often through a belt connected to the crankshaft, whereas a turbocharger is powered by a turbine driven by the engine's exhaust gas.[20] Compared with a mechanically driven supercharger, turbochargers tend to be less responsive. Twincharger refers to an engine with both a supercharger and a turbocharger. Belts, chains, shafts, and gears are common methods of powering a supercharger, placing a mechanical load on the engine.For example, on the single-stage single-speed supercharged Rolls-Royce Merlin engine, the supercharger uses about 150 hp (110 kW). Yet the benefits outweigh the costs; for the 150 hp (110 kW) to drive the supercharger the engine generates an additional 400 hp (300 kW), a net gain of 250 hp (190 kW). This is where the principal disadvantage of a supercharger becomes apparent; the engine must withstand the net power output of the engine plus the power to drive the supercharger.

Characteristic

The operating characteristics of the turbine are determined by the specific cross-section of the air flow. The throat of the cross-section is in the transition zone of the entrance passage of the volute. By reducing this throat section, more exhaust gas is confined upstream of the turbine, resulting in a higher pressure ratio to improve the performance of the turbine. A smaller air flow cross-section can produce a higher boost pressure. The flow cross-sectional area of ​​the turbine can be easily adjusted by changing the turbine housing.

In addition to the volute airflow cross-section, the exit area at the turbine inlet also affects the turbine's flow rate. For the machining of turbine casting contours, the cross-sectional size can be adjusted to adjust the boost pressure. The enlargement of the profile will increase the flow cross-sectional area of ​​the turbine.

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