QR515MHA-1700010EA
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Comprehensive Professional Description: Chery A5 Complete Gearbox (Part No. QR515MHA-1700010EA)
1. Basic Overview & Core Functional Positioning
The QR515MHA-1700010EA is a fully assembled original equipment manufacturer (OEM) manual transmission gearbox, engineered as a core powertrain component exclusively for the Chery A5 compact sedan, paired with the vehicle’s dedicated displacement gasoline engine to form a complete power transmission system. As the pivotal intermediate link between the engine and drive axle, this complete gearbox undertakes the irreplaceable core functions of torque conversion, speed regulation, and power direction control, translating the engine’s rotational torque and rotational speed into adaptable driving force to meet diverse driving scenarios such as starting, accelerating, cruising, climbing, and reversing.
Tailored precisely to the Chery A5’s chassis layout, power parameters, and vehicle positioning as an economical family compact car, this QR515MHA series gearbox is a front-wheel-drive manual transmission assembly, featuring a compact structure, high transmission efficiency, and reliable durability to fit the vehicle’s daily commuting, urban driving, and medium-load travel demands. It is a fully assembled unit, integrating all internal transmission components, housing, and auxiliary parts, delivering plug-and-play installation convenience for vehicle maintenance and replacement scenarios.
The operational performance, transmission precision, and structural stability of this complete gearbox directly determine the Chery A5’s dynamic response, fuel economy, driving smoothness, and overall reliability. As a fully assembled OEM component, it eliminates the errors and instability caused by separate parts assembly, ensuring consistent factory-calibrated performance; any structural defect, gear mismatch, or assembly deviation can trigger issues like rough shifting, power loss, abnormal noise, or even catastrophic transmission failure, making it a core component that underpins the vehicle’s normal driving and long-term durability.
2. Material Selection & Precision Manufacturing & Assembly Process
The QR515MHA-1700010EA complete gearbox adopts high-performance, wear-resistant engineering materials for all core components, selected based on stringent automotive powertrain material standards, balancing strength, fatigue resistance, and friction performance to withstand long-term high-speed rotation, alternating loads, and thermal stresses. The gearbox housing is crafted from high-strength die-cast aluminum alloy, featuring lightweight properties, excellent rigidity, and effective heat dissipation, reducing the overall powertrain weight and improving vehicle fuel efficiency while protecting internal components from external damage and environmental contamination.
Internal driving gears, driven gears, and synchronizer assemblies are forged from high-grade alloy steel, undergoing precision forging, carburizing and quenching, and precision grinding processes to enhance surface hardness, wear resistance, and core toughness. This treatment ensures gears can withstand high-intensity torque transmission without tooth breakage, pitting, or excessive wear, even under frequent shifting and heavy-load conditions. Synchronizer rings use high-friction, heat-resistant brass or alloy materials, optimizing gear engagement speed and smoothness, avoiding gear grinding and reducing component wear during shifting.
The manufacturing and assembly of this complete gearbox follow Chery’s strict OEM assembly standards, relying on automated production lines and precision tooling to guarantee zero-error assembly of internal components. All gear clearances, shaft concentricity, and synchronizer positioning are calibrated to micron-level tolerances, with strict dynamic balance testing for rotating components to eliminate abnormal vibration and noise. Post-assembly, each unit undergoes comprehensive performance testing, including no-load operation testing, load testing, sealing testing, and shifting smoothness testing, verifying compliance with factory performance indicators before leaving the production line.
Additionally, the gearbox is pre-filled with special gearbox oil matching the QR515MHA model, optimizing lubrication, heat dissipation, and wear reduction for internal components; this pre-filled oil ensures immediate operational stability upon installation, eliminating the risk of insufficient lubrication or incorrect oil selection during aftermarket assembly. The combination of high-performance materials, precision manufacturing, and full-process quality control makes this complete gearbox far superior to refurbished or semi-assembled aftermarket alternatives in durability and operational stability.
3. Structural Design & Key Internal & External Components
The QR515MHA-1700010EA is a 5-speed manual front-wheel-drive complete gearbox, featuring a compact, integrated shaft-layout design tailored to the Chery A5’s front-engine front-wheel-drive layout, minimizing space occupancy and adapting to the vehicle’s limited powertrain compartment. It consists of a robust outer housing and a full set of refined internal components, collaborating to achieve efficient, stable power transmission and smooth gear shifting.
The external structure includes the die-cast aluminum alloy main housing and auxiliary housing, featuring reserved mounting holes, shift lever interface, clutch input shaft interface, drive axle output interface, and gearbox oil inlet/drain port. The housing is designed with heat dissipation fins to accelerate operational heat dissipation, preventing overheating-induced performance degradation; reinforced mounting brackets ensure stable fixation to the vehicle frame, avoiding displacement or vibration under dynamic conditions. The integrated input shaft flange and output shaft flange enable seamless docking with the clutch assembly and drive axles, ensuring efficient power transfer without loss.
Internal core components include the input shaft, output shaft, reverse shaft, 5-speed gear sets (1st to 5th gears), synchronizer assemblies, shift forks, shift shaft mechanism, bearing groups, and sealing components. The gear sets adopt a helical gear design, featuring smooth meshing, low noise, and large torque-bearing capacity, improving transmission stability and reducing operational noise compared to straight gears. Synchronizer assemblies are equipped for each forward gear, realizing friction-free, rapid gear engagement to promote smooth shifting and extend gear service life.
High-precision rolling bearings support all rotating shafts, reducing rotational friction and power loss, ensuring flexible shaft rotation and enhancing transmission efficiency. The shift control mechanism features a calibrated shift stroke and clear gear positioning, eliminating ambiguous shifting and accidental gear engagement, with a dedicated reverse gear locking device to prevent misoperation. Comprehensive oil seals and gaskets are installed at all docking gaps, achieving full sealing to avoid gearbox oil leakage and prevent external dust and moisture from invading the internal cavity.
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