4955300
Product Details
Comprehensive Professional Description: Dongfeng H30 Small Control Arm (Part No. 4955300)
1. Basic Overview & Core Functional Positioning
The 4955300 is an authentic Original Equipment Manufacturer (OEM) small control arm, exclusively engineered and produced by Dongfeng Motor Corporation for the Dongfeng H30 compact sedan—a vehicle renowned for its practicality, fuel efficiency, and reliable performance in urban and suburban driving scenarios. As a critical component of the Dongfeng H30’s front suspension system, the 4955300 small control arm plays an irreplaceable role in connecting the vehicle’s steering knuckle to the frame, directly influencing steering precision, ride comfort, handling stability, and overall safety. Specifically designed to match the structural specifications of the Dongfeng H30’s suspension system, this small control arm serves as a key load-bearing and motion-transmitting component, ensuring the vehicle maintains optimal tire alignment, absorbs road vibrations, and adapts to various road conditions.
The Dongfeng H30, launched by Dongfeng Motor as a flagship compact sedan, is equipped with a front MacPherson independent suspension system—an arrangement that relies heavily on the small control arm to balance flexibility and stability. The 4955300 small control arm works in tandem with other suspension components, including the shock absorber, coil spring, stabilizer bar, and ball joint, to transfer vertical and lateral forces between the tire and the vehicle frame. When the vehicle encounters uneven road surfaces, potholes, or bumps, the small control arm absorbs and dissipates impact forces, reducing vibrations transmitted to the vehicle cabin and ensuring a smooth ride. Additionally, it maintains precise tire alignment during steering and braking, preventing irregular tire wear and ensuring responsive handling—critical for safe driving, especially at high speeds or in emergency maneuvering.
The unique part number 4955300 serves as a definitive identifier for this genuine OEM component, guaranteeing strict compliance with Dongfeng’s original design standards, material specifications, and performance benchmarks. This part number distinguishes the genuine 4955300 from inferior aftermarket alternatives, which often lack structural integrity, precision fitment, and corrosion resistance—leading to premature failure, poor steering response, uneven tire wear, and even potential safety hazards. The small control arm operates in a harsh environment, exposed to road debris, moisture, road salt, extreme temperatures (ranging from -40°C to 80°C), and constant mechanical stress from acceleration, braking, and cornering. A faulty 4955300 can result in symptoms such as abnormal steering noise (clunking or squeaking), loose steering, uneven tire wear (especially on the inner or outer edges), and reduced handling stability. As such, the genuine 4955300 is an essential replacement part for Dongfeng H30 owners and professional automotive repair technicians.
2. Premium Material Selection & Precision Manufacturing Process
The 4955300 Small Control Arm is crafted from high-performance, automotive-grade materials, carefully selected to withstand the extreme operating conditions of the Dongfeng H30’s suspension system—including constant mechanical stress, impact forces, corrosion, and environmental contaminants. Dongfeng’s engineering team prioritized a balance of structural strength, flexibility, corrosion resistance, and lightweight design when selecting materials for the 4955300, ensuring that the small control arm can maintain reliable performance throughout its service life.
The core body of the 4955300 small control arm is constructed from high-strength steel (Q345B), a material renowned for its excellent tensile strength (345 MPa minimum), yield strength, and ductility—ideal for withstanding the vertical and lateral loads exerted on the suspension system during driving. The steel is processed through a hot-rolled forming process to enhance its structural integrity and eliminate internal defects, ensuring uniform strength across the entire component. The surface of the steel body is treated with a multi-layer anti-corrosion coating, including a zinc phosphate undercoat and a high-temperature electrostatic powder topcoat, which provides superior resistance to rust, oxidation, and corrosion caused by road salt, moisture, and environmental pollutants. This coating ensures the small control arm remains durable even in harsh driving conditions, such as coastal areas or regions with heavy snowfall.
The 4955300 also features a high-precision ball joint, a critical component that connects the small control arm to the steering knuckle. The ball joint is manufactured from high-carbon chromium bearing steel (GCr15), which offers exceptional wear resistance, hardness, and fatigue strength. The ball stud is precision-ground to a smooth surface finish (Ra ≤ 0.4μm) to minimize friction, while the ball socket is lined with a wear-resistant PTFE (polytetrafluoroethylene) bushing, ensuring smooth rotation and reducing noise during steering and suspension movement. Additionally, the ball joint is sealed with a high-temperature, oil-resistant rubber boot, which prevents dust, dirt, and moisture from entering the joint and causing premature wear or failure.
The manufacturing process of the 4955300 Small Control Arm follows a strict, ISO 9001 and IATF 16949 certified production workflow, consistent with Dongfeng’s global quality standards and modern automotive suspension component manufacturing practices. The production process begins with precision cutting of the high-strength steel plate using CNC plasma cutting equipment, ensuring accurate dimensions and clean edges. The steel plate is then formed into the required shape using a hydraulic press, with multiple forming stages to ensure the component’s curvature and structural integrity. After forming, the component undergoes a series of heat treatments (annealing and quenching) to enhance its hardness and fatigue resistance, followed by precision machining of the mounting holes, ball joint socket, and other critical surfaces to ensure a perfect fit with the Dongfeng H30’s suspension system.
The ball joint assembly is manufactured with strict quality control, including precision grinding of the ball stud, PTFE bushing installation, and rubber boot sealing. Each ball joint is tested for rotational smoothness, load-bearing capacity, and sealing performance to ensure it meets Dongfeng’s strict standards. The entire small control arm is then subjected to a series of rigorous tests, including static load testing (to verify load-bearing capacity), fatigue testing (to simulate 100,000+ kilometers of driving), corrosion testing (salt spray test for 720 hours), and dimensional accuracy testing. Only components that pass all these tests are allowed to leave the factory, ensuring the 4955300 delivers reliable performance in the Dongfeng H30.
3. Structural Composition & Key Design Features
The 4955300 Small Control Arm features a precision-engineered structural design, tailored to the specific layout and requirements of the Dongfeng H30’s front MacPherson suspension system. The component’s structural composition is optimized to provide superior load-bearing capacity, precise motion transmission, and easy installation, with key design features that address the unique challenges of suspension operation in compact sedans. Unlike generic aftermarket small control arms, which often have a simplistic design with poor structural rigidity, the 4955300 incorporates multiple specialized features to ensure consistent performance and long service life.
One of the key design features of the 4955300 is its integrated one-piece steel body design. The body is formed as a single unit, eliminating the need for welding (which can create weak points and potential failure risks) and ensuring uniform structural strength. The body features a curved, aerodynamic shape that optimizes load distribution, reducing stress concentration and enhancing fatigue resistance. The front end of the body is equipped with a precision-machined ball joint socket, which houses the ball joint and connects to the steering knuckle, while the rear end features two mounting holes that attach to the vehicle’s frame via rubber bushings.
The rubber bushings, another critical design feature of the 4955300, are made of high-quality EPDM (Ethylene Propylene Diene Monomer) rubber, reinforced with a steel sleeve. These bushings are designed to absorb vibrations and reduce noise, isolating the suspension system from the vehicle frame and improving ride comfort. The bushings also allow for slight rotational movement of the small control arm, accommodating the suspension’s up-and-down motion while maintaining structural stability. The steel sleeve inside the bushing ensures a tight fit with the mounting bolts, preventing looseness and ensuring precise alignment.
The 4955300 also features a optimized ball joint design, which is pre-lubricated with high-temperature lithium-based grease to ensure smooth rotation and reduce wear. The ball joint’s rubber boot is designed with a flexible, bellows-like structure that allows for maximum movement while maintaining a tight seal, preventing contamination. Additionally, the ball joint is designed to be replaceable, allowing for easy maintenance and reducing the overall cost of ownership—though the genuine 4955300’s ball joint is engineered to last the lifetime of the component under normal driving conditions.
To enhance structural rigidity and reduce weight, the 4955300’s body features a series of reinforcing ribs, strategically placed in high-stress areas to distribute loads evenly and prevent bending or deformation. The mounting holes are precision-machined to match the exact dimensions of the Dongfeng H30’s frame and steering knuckle, ensuring a seamless fit and eliminating the need for modifications during installation. The component’s overall weight is optimized (approximately 2.8kg), reducing unsprung mass and improving suspension responsiveness and fuel efficiency.
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