Description

Technical Specification & Payment and Trade Terms & Delivery and Packaging

Desc.	Turbocharger	Part No	404729 4955686 4041789 QST30 5321615 4042917 4033508 4042918 4042919 4955329
Brand Name	Cummins, Detroit, DCEC, CCEC, XCEC etc.	Other parts	pls contact freely if you need other P/N
Engine Type	Diesel engine, Gas engine, Diesel Generator, Marine engine, Construction engine Pump engine etc.	Spare Type	Wearing spare parts, maintenance tools, repair kit, upper and lower engine gasket kit.
Condition:	Original and brand new	Applicatble industriy	Retail, marine engines, Construction works, Energy & Mining etc
Key Word:	Original spare parts and engine repair tool kits	Trade terms	FOB EXW CIF DDU DDP, Door to door is available in some countries.
Delivery time:	Most parts are in stock, bulk order based on qty	Payment	T/T, L/C, D/A, Alipay, Western Union, Paypal etc.
Place of origin	China/USA/Japan/Austria/Mexico	Package	Neutral or original packaging
About the product	Turbocharger The turbocharger, often colloquially referred to as the "snail" or "screw" due to its resemblance to a snail shell or conch, is the most critical component of the turbocharging system. It plays a pivotal role in enhancing volumetric efficiency and consists of three main sections: the intake end, the exhaust end, and the connecting central housing. 1. Intake End: The intake end comprises the compressor housing, which includes the compressor inlet, compressor outlet, and compressor wheel. The compressor wheel draws in ambient air, compresses it, and delivers it to the engine for improved combustion efficiency. 2. Exhaust End: The exhaust end features the turbine housing, which contains the turbine inlet, turbine outlet, and turbine wheel. The turbine wheel is driven by the high-temperature exhaust gases from the engine, thereby rotating the compressor wheel via a common shaft. 3. Central Housing: Connecting the two housings is the bearing housing, which houses the shaft that supports both the compressor and turbine wheels. This shaft operates at extremely high speeds, typically ranging from 120,000 to 160,000 rpm. The bearing housing also includes oil and water channels for lubrication and cooling, ensuring reliable operation under extreme conditions. Thermal Challenges and Heat Dissipation One of the most significant challenges faced by the turbocharger is managing high temperatures. The turbine encounters exhaust gases reaching temperatures exceeding 900°C (the first heat source), which drives the turbine wheel and subsequently the compressor wheel. The high-speed rotation of the shaft generates substantial frictional heat (the second heat source), while the compression of air by the compressor wheel further increases temperature (the third heat source). These combined thermal loads necessitate effective heat dissipation mechanisms. Dedicated oil and water passages within the turbocharger facilitate efficient cooling, maintaining optimal operating temperatures and extending component life. Turbine Shaft Design The turbine shaft, despite appearing as a simple metal tube, is a highly engineered precision component designed to withstand extreme rotational speeds and temperatures. Traditional designs utilize bushing bearings, which rely on pressurized oil for support and cooling. However, modern advancements have introduced ball bearings, offering several advantages: Reduced Friction: Ball bearings provide lower friction, improving turbo response and reducing lag. Stable Operation: They offer more stable dynamic control compared to floating bushing bearings. Lower Oil Requirements: Ball bearings place less demand on oil pressure and quality, indirectly enhancing durability. However, ball bearings are generally less durable than bushing bearings, with a typical lifespan of around 70,000 to 80,000 kilometers. Additionally, they are more challenging and costly to repair, leading some manufacturers prioritizing durability (such as KKK) to avoid their use. Turbine Wheel Design Turbine wheels can be classified into two types based on blade design: Axial Flow (Waterwheel Type: Features straight blades that allow exhaust gas to collide directly, generating rotational force. Radial Flow (Windmill Type: Utilizes curved blades that not only harness collision forces but also optimize airflow between blades, capturing more energy from expanding exhaust gases. The diameter and number of blades influence the turbine's performance characteristics. Fewer blades generally result in poorer low-speed response but superior high-speed performance and sustained power delivery. Compressor Wheel Design While both the turbine and compressor wheels serve as the power sources for the turbocharger, their functions differ, leading to distinct blade designs. The primary goal of the compressor wheel is to efficiently compress air and deliver it to the engine. Original equipment manufacturer (OEM) turbochargers typically feature full-blade designs, where blades extend continuously from top to bottom. To enhance high-speed efficiency, some aftermarket designs incorporate partial blades alongside full blades. Another key consideration in compressor wheel design is maintaining uniform airflow. Traditional radial impellers experience rapid changes in gas flow rates between blades, leading to potential issues such as compressor surge-a phenomenon where excessive compressed air cannot be delivered due to insufficient pressure generation, resulting in unstable operation.

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1 Cummins engine parts Production technology 6