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372-1005010AB

Brand: Chery

Model: QQ

Product Name：Crankshaft

Part Number: 372-1005010AB

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Product Details

Comprehensive Professional Description: Chery QQ Crankshaft (Part No. 372-1005010AB)

1. Basic Overview & Core Positioning

The 372-1005010AB is a genuine original equipment manufacturer (OEM) crankshaft assembly, meticulously designed and manufactured exclusively for Chery QQ mini passenger vehicles equipped with the 372 series three-cylinder naturally aspirated gasoline engine. As one of the most critical rotating and power-converting components within the engine’s core powertrain system, the crankshaft holds an irreplaceable position in the entire vehicle’s power transmission chain, serving as the pivotal link that transforms the reciprocating linear motion of engine pistons into continuous, usable rotational torque. This torque is subsequently transmitted to the clutch assembly, transmission system, drive shafts, and ultimately to the vehicle’s wheels, enabling forward and reverse movement of the Chery QQ.

Tailored specifically to the structural characteristics and operational parameters of the Chery 372 series three-cylinder engine, this crankshaft is engineered to withstand the unique dynamic loads, vibration patterns, and thermal stresses inherent to small-displacement three-cylinder powerplants. Unlike universal aftermarket crankshafts, the 372-1005010AB is not a one-size-fits-all component; it is precision-machined to match the exact bore, stroke, connecting rod dimensions, and engine block layout of the Chery QQ’s 372 engine, ensuring seamless integration, optimal power output, and long-term operational stability. It bears the full brunt of alternating mechanical stresses, cyclic impact loads, and high-frequency torsional forces generated during the engine’s four-stroke combustion cycle (intake, compression, combustion, exhaust), making its structural integrity, material durability, and machining precision directly determinative of the engine’s overall performance, service life, fuel efficiency, and operational reliability.

For the Chery QQ, a compact urban microcar designed for daily commuting, city driving, and lightweight utility, the 372-1005010AB crankshaft is the cornerstone of engine dependability. It is engineered to meet Chery’s stringent OEM quality standards, passing a battery of rigorous performance tests including fatigue resistance testing, dynamic balance calibration, torsional stiffness assessment, and wear resistance trials. This ensures the crankshaft can endure prolonged daily operation, frequent start-stop cycles, and varying load conditions typical of urban driving, without compromising performance or incurring premature mechanical failure. In the entire engine assembly, the crankshaft works in tandem with pistons, connecting rods, bearings, and the flywheel to form a complete power conversion system, and any defect or deviation in its design or manufacturing can trigger catastrophic engine damage, including bearing seizure, piston scuffing, or even complete engine failure.

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2. Material Selection & Precision Manufacturing Process

The performance and durability of the 372-1005010AB crankshaft are fundamentally rooted in its premium material formulation and state-of-the-art manufacturing processes, adhering to strict automotive industry standards and Chery’s internal quality control protocols. This crankshaft is forged from high-grade ductile iron (nodular cast iron), a material selected for its exceptional combination of mechanical properties ideal for engine crankshaft applications: high tensile strength, superior fatigue resistance, excellent torsional stiffness, and outstanding wear resistance, all while maintaining cost-effectiveness and suitability for mass production. Ductile iron is engineered with spherical graphite particles embedded within the metal matrix, which effectively absorb and disperse mechanical stress, prevent crack propagation, and enhance the material’s toughness—critical attributes for withstanding the cyclic loads and impact forces of engine operation.

The manufacturing journey of the 372-1005010AB crankshaft begins with precision hot forging, which compresses the raw ductile iron ingot into a near-net-shape crankshaft blank. This forging process refines the metal’s grain structure, aligns the grain flow to follow the crankshaft’s contour, and eliminates internal voids or porosity, significantly boosting its structural strength and fatigue life compared to cast crankshafts. Following forging, the crankshaft blank undergoes a sophisticated thermal refining process, including normalized annealing and quenching and tempering, which optimizes the material’s hardness, toughness, and internal stress distribution. This heat treatment eliminates residual stresses from forging, prevents deformation during high-temperature operation, and ensures the crankshaft maintains its dimensional stability even under extreme engine thermal loads.

Next, the crankshaft undergoes precision computer numerical control (CNC) machining, the most critical stage in achieving the stringent dimensional tolerances required for OEM performance. Every key feature—including main journals, connecting rod journals, crank throws, counterweights, oil passages, and flange surfaces—is machined to sub-micron level accuracy, ensuring perfect alignment with mating components such as main bearings, connecting rod bearings, and the flywheel. The journal surfaces, which bear the brunt of rotational friction, are subjected to precision grinding and surface hardening treatment, typically induction hardening or nitriding. This process creates a hardened, wear-resistant surface layer with a controlled depth, enhancing the journal’s resistance to abrasive wear, scuffing, and fatigue cracking, while retaining a tough, ductile core to absorb impact loads.

Post-machining, the crankshaft undergoes strict dynamic balance testing and correction, a mandatory step for three-cylinder engines due to their inherent rotational imbalance. Specialized balancing machines detect even minor mass deviations across the crankshaft’s rotating assembly, and excess material is precisely removed from the counterweights to achieve perfect balance. This eliminates excessive rotational vibration, reduces noise, harshness, and vibration (NVH) levels, minimizes stress on bearings and engine mounts, and ensures smooth engine operation across all RPM ranges. Finally, the crankshaft undergoes thorough quality inspection, including dimensional verification, hardness testing, crack detection (via magnetic particle or ultrasonic testing), and oil passage flow testing, to ensure every unit meets Chery’s OEM specifications before leaving the production line.

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Summary: Chery QQ Crankshaft (Part No. 372-1005010AB)

The 372-1005010AB is an authentic OEM crankshaft tailored exclusively for Chery QQ mini cars equipped with the 372 series three-cylinder gasoline engine, serving as a core engine component that converts pistons’ reciprocating linear motion into rotational torque to power the vehicle.

Forged from high-grade ductile iron, it undergoes precision hot forging, thermal refining, CNC machining and strict dynamic balance calibration, featuring high torsional stiffness, fatigue resistance and wear resistance. Key structures include precision main/connecting rod journals, optimized counterweights and integrated lubrication oil passages, ensuring smooth rotation, low NVH and reliable lubrication to reduce friction and wear.

This crankshaft is only compatible with Chery QQ 372 series engine models, non-interchangeable with other vehicle or engine variants. Professional installation is required, and routine maintenance involves regular oil changes, oil leak checks and wear inspections to sustain stable engine performance and prolong service life.

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