2911100U1510
Brand: JAC
Model: S5
Product Name：Rear Sub Frame
Part Number: 2911100U1510
Product Details
1. Basic Overview & Core Functional Positioning
The 2911100U1510 Rear Sub Frame, also known as the rear suspension subframe or rear auxiliary frame assembly, is an authentic OEM structural chassis component exclusively manufactured for the JAC Refine S5 compact SUV series. As a fundamental load-bearing and connecting part of the vehicle’s rear chassis system, this rear subframe is installed beneath the rear passenger compartment, serving as a unified mounting platform for the entire rear multi-link independent suspension, rear shock absorbers, stabilizer bar, brake assembly, and rear wheel hub components. It acts as a critical bridge between the vehicle body and rear suspension system, undertaking multiple core functions including structural load bearing, vibration isolation, impact buffering, and suspension positioning. This part is specially calibrated and dimensioned to match the JAC S5’s unique butterfly-shaped rear subframe layout and four-link independent suspension structure, ensuring highly consistent chassis geometry and precise wheel positioning parameters during vehicle operation.
Unlike ordinary simple support brackets, the 2911100U1510 Rear Sub Frame is designed as an integrated chassis structural assembly that determines the overall rigidity, handling stability, and riding comfort of the JAC S5. During daily driving, it bears vertical loads from vehicle curb weight, passenger weight, and cargo load, while resisting lateral and torsional forces generated during cornering, lane changing, and uneven road driving. By fixing all rear suspension components on a unified rigid frame, it effectively avoids suspension displacement and parameter deviation, maintaining accurate wheel camber and toe angles. Additionally, equipped with matched rubber mounting bushings, the subframe isolates road vibration and tire noise transmitted from the ground to the vehicle body, significantly improving the vehicle’s NVH (Noise, Vibration, Harshness) performance and optimizing overall driving smoothness.
The part number 2911100U1510 is a dedicated exclusive specification code for JAC Refine S5, featuring unique mounting hole positions, overall dimensions, and structural curvature that cannot be interchanged with subframes of other JAC models such as Refine S3, M4, or pickup series. Manufactured in strict accordance with JAC original factory chassis design standards and IATF 16949 international automotive quality certification, every structural parameter and assembly tolerance is precisely adapted to the JAC S5 chassis platform. Compared with low-precision aftermarket subframes that are prone to deformation, hole position deviation, and insufficient rigidity, the genuine 2911100U1510 subframe effectively prevents common chassis faults such as vehicle drifting, uneven tire wear, loose chassis feeling, and abnormal rear suspension noise, maintaining original chassis handling performance for a long time.
2. Material Selection & Manufacturing Standards
The 2911100U1510 Rear Sub Frame adopts high-strength automotive-grade structural steel materials and integrated welding molding technology to adapt to long-term complex stress working conditions, including alternating load impact, torsional extrusion, and harsh outdoor environmental erosion. The main frame body is made of high-quality low-alloy high-strength steel plate with a tensile strength exceeding 550MPa, which features excellent structural rigidity, torsion resistance, and fatigue resistance. Different from ordinary carbon steel materials, this high-strength steel has stronger anti-deformation ability, effectively resisting permanent structural torsion and bending deformation caused by long-term driving on bumpy roads and heavy-load conditions. Meanwhile, the frame body adopts optimized hollow pipe structure and lightweight hole-opening design, which reduces unnecessary chassis weight while ensuring structural strength, improving vehicle fuel economy and chassis dynamic response speed.
All welding joints of the subframe adopt automated robotic arc welding technology, with uniform welding seam density and penetration depth, eliminating welding defects such as virtual welding, missing welding and welding bubbles that easily occur in manual welding. The overall welding forming precision is high, ensuring the flatness of the mounting surface and the positional accuracy of all mounting holes. The surface of the subframe undergoes multi-layer anti-corrosion treatment, including sandblasting rust removal, electrophoretic primer coating, and black anti-rust finish spraying. This complete anti-corrosion process enables the part to effectively resist rainwater erosion, road salt corrosion in winter, and muddy water splashing, avoiding rust, peeling and material aging, and greatly extending the service life of the chassis structure.
Each finished 2911100U1510 Rear Sub Frame undergoes strict factory quality inspection, including overall dimensional tolerance detection, three-coordinate precision hole position calibration, torsion fatigue testing, impact resistance testing, and salt spray corrosion resistance testing. All products pass long-term chassis bench simulation tests to verify structural stability under full-load and limit working conditions. The genuine subframe maintains stable structural performance without deformation or looseness after hundreds of thousands of kilometers of complex road driving, with durability far exceeding ordinary aftermarket welded subframes, fully meeting JAC’s strict chassis safety and reliability standards.
3. Structural Composition & Working Principle
The 2911100U1510 Rear Sub Frame adopts a mature butterfly-shaped integrated closed-frame structure exclusive to JAC S5, composed of main longitudinal beams, reinforced cross beams, suspension mounting bases, bushing mounting holes, and fixed bolt hole groups. The overall structure is compact and rigid, forming a closed force-bearing loop. The front and rear longitudinal beams bear vertical and longitudinal impact forces, while the middle reinforced cross beams enhance lateral torsion resistance, effectively dispersing and decomposing concentrated stress generated during driving. All suspension mounting points are integrally stamped and welded with the frame body, ensuring high precision and non-deformable positioning of installation positions.
The subframe is connected to the vehicle body through four sets of high-elasticity rubber isolation bushings installed at the front and rear ends. This flexible connection structure is the core of vibration isolation and noise reduction. When the vehicle passes through bumpy roads, road vibration and impact are first absorbed and buffered by the rubber bushings, avoiding rigid vibration directly transmitted to the vehicle body, thus improving riding comfort. At the same time, the high-rigidity frame structure firmly locks the spatial position of the rear suspension multi-link structure, ensuring that the suspension operates strictly according to the preset stroke and angle during compression and rebound, preventing suspension displacement and parameter disorder.
In daily driving working conditions, the subframe realizes two core working states: rigid support and flexible vibration isolation. During straight-line stable driving, it maintains high rigidity to ensure stable tire grounding and straight-line driving stability. During steering and bumpy road driving, it absorbs torsional stress and vibration through structural elasticity and rubber bushing buffering, balancing chassis rigidity and comfort. The optimized force transmission path design of the 2911100U1510 subframe effectively reduces chassis resonance, suppresses rear end floating during high-speed driving, and significantly improves the JAC S5’s high-speed stability and cornering limit performance.
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