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Brand: C.OEFT
OE numbers: 025CHA-1509100
Product Name: Transmission Input Shaft
Compatible model:025CHA-1509101
Product status: Original
Number of teeth on the product: -
Product weight:0.4265kg
Packaging size: 32*13*4cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: For Chery 025
1. Core Power Reception and Torque Transmission
As the primary interface between the engine (or torque converter) and the transmission’s internal gear set, the 025CHA-1509100 input shaft serves as the "first link" in the power transmission chain. The front spline section of the shaft directly mates with the clutch assembly (in manual/dual-clutch transmissions) or torque converter (in automatic transmissions), capturing rotational power from the engine. It then transmits this torque to the main gear set via its integrated gear teeth or rear spline section, enabling the transmission to adjust speed and torque ratios according to driving demands. For example, in a light commercial vehicle hauling a 2-ton load, the input shaft efficiently transfers the engine’s 350 N·m torque to the transmission’s 1st gear, which amplifies the torque to 1330 N·m (via a 3.8:1 gear ratio) to ensure sufficient starting power. Without this core function, the transmission would be unable to receive and distribute engine power, rendering the vehicle inoperable.
2.Clutch Engagement/Disengagement Coordination
In manual (MT) and dual-clutch (DCT) transmission systems, the 025CHA-1509100 input shaft plays a critical role in coordinating smooth clutch operation. The precision-machined spline section of the shaft provides a stable sliding surface for the clutch hub, ensuring uniform contact pressure when the clutch is engaged. The low-friction DLC coating allows the clutch hub to slide freely along the splines during disengagement, eliminating "clutch drag" (a common issue that causes gear grinding and increased wear). Additionally, the strict dimensional accuracy of the shaft ensures that the clutch disc remains perfectly aligned with the flywheel, even as components heat up and expand during operation (with a thermal expansion coefficient of 11.2×10⁻⁶/°C). This alignment prevents uneven clutch wear and extends the clutch’s service life by 30-40% compared to systems with low-precision input shafts.
1. Premium Alloy Material for Superb Strength and Toughness
The 025CHA-1509100 transmission input shaft is constructed from high-grade chrome-molybdenum-vanadium alloy steel (42CrMoV4), a material renowned for its exceptional combination of tensile strength and impact toughness. Through a rigorous two-stage heat treatment process—including high-temperature quenching (at 860-880°C) and tempering (at 580-600°C)—the shaft achieves a surface hardness of HRC 60-63 and a core toughness of ≥1400 MPa. This material optimization enables it to withstand extreme torque loads of up to 420 N·m, making it ideal for heavy-duty transmission systems (such as those in light commercial vehicles and mid-size SUVs equipped with 2.0L-2.5L turbocharged engines). Compared to standard 45# carbon steel input shafts, its fatigue resistance is enhanced by 60%, effectively preventing premature failure caused by long-term cyclic torque impacts (e.g., frequent start-stop cycles in urban logistics transportation).
2. Ultra-Precision Machining for Zero-Error Transmission
Every 025CHA-1509100 input shaft undergoes a multi-step precision machining process using CNC turning centers and five-axis grinding machines, with dimensional tolerance strictly controlled within ±0.003 mm and surface roughness (Ra) as low as 0.2 μm. The shaft’s key functional parts—including the spline section, bearing journals, and gear teeth—feature exceptional concentricity (runout ≤0.005 mm) and perpendicularity (deviation ≤0.002 mm). The spline teeth adopt a modified involute profile with a tooth contact area of over 92% when mated with the clutch hub, ensuring uniform torque distribution and eliminating localized stress concentrations. This high-precision manufacturing not only minimizes power loss caused by component misalignment (reducing energy waste by 3-5%) but also eliminates abnormal noise and vibration during gear engagement, enhancing the overall smoothness of the transmission system.
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