غطاء السقف الكسوة الخارجية: تفكيك 10 الأجزاء المهمة للديناميكية الهوائية الخالية من العيوب

Welcome to our complete technical deconstruction of the غطاء السقف الكسوة الخارجية نظام, a primary feature of the FAW Jiefang CA3250P66K2L1T1E 6×4 تفريغ الشاحنة. هذا الدليل يكسر 10 critical parts that form this assembly, which is essential for aerodynamics, cab protection, and integrating marker lighting.

ال غطاء السقف الكسوة الخارجية is a highly engineered assembly that combines the function of a sun visor, an aerodynamic deflector, and a housing for safety lighting. It is not a simple piece of trim, but a structural component that must withstand high wind speeds and constant vibration. This analysis will deconstruct the main shell, its complex mounting system, and all associated hardware.

جوهر 1: The ‘Aerodynamic Shell’ منطق (The Visor Assembly)

This is the primary component and visual centerpiece of the غطاء السقف الكسوة الخارجية نظام. It is the large, contoured shell that defines the top-front profile of the J6P cab.

1. عنصر: ‘Roof sun visor assembly’ (5704010-أ01) – الكمية 1
هذا (شركات 1) is the main structural shell. It is a large, molded component made from a high-impact composite polymer or ABS plastic, designed to be both lightweight and extremely rigid.

The Aerodynamic Logic is its primary function. The precise, curved shape of this visor is not just for styling; it is an aerodynamic deflector. It is engineered to catch the air hitting the flat front of the cab and direct it smoothly up and over the roof.

This action significantly reduces aerodynamic drag, which is a major factor in fuel consumption on highway-capable trucks like the CA3250P66K2L1T1E. It also helps to keep the roof and the tops of the doors cleaner by managing airflow.

The Protection Logic is also critical. This shell acts as a sacrificial “cap” for the cab’s sensitive roof seam. It protects the main cab-to-roof weld from direct exposure to rain, الجليد, sun (UV degradation), والحطام. This is a vital part of the NOT-FOUND_LIN K[133, Roof Panel Assembly] نظام.

The Structural Logic is evident in its design. The underside is molded with reinforcement ribs to prevent it from flexing, “oil-canning” (الضرب), or vibrating at high speeds, which would lead to noise and fatigue cracks. This rigidity is essential for the غطاء السقف الكسوة الخارجية to function.

جوهر 2: The ‘Structural Mount’ منطق (The Bracket System)

This group represents the heavy-duty framework that physically attaches the غطاء السقف الكسوة الخارجية shell to the steel cab body. This is a four-part, symmetrical system designed to handle extreme forces.

1. عنصر: ‘Left/Right connection plate assembly’ (5704035-أ01 / 5704040-أ01) – الكمية 1 كل
هؤلاء (شركات 2 and Comp 3) are the primary load-bearing mounts. هم “التجميعات,” meaning they are complex brackets, not simple plates. They bolt directly to the cab’s A-pillars or roof frame, providing the main connection points.

2. عنصر: ‘Left/Right support rod bracket assembly’ (5704065-أ01 / 5704070-أ01) – الكمية 1 كل
هؤلاء (شركات 5 and Comp 6) are the secondary supports. Their presence indicates that the ‘connection plates’ alone are not enough. These ‘support rods’ likely triangulate the mounting system.

The Symmetrical Logic is key. By using mirrored left/right components, the design ensures that wind-loading and vibration forces are distributed equally on both sides of the cab, preventing uneven stress on the غطاء السقف الكسوة الخارجية.

The Triangulation Logic is why both “plates” و “rod brackets” are used. The plates handle the main vertical load (gravity) and shear force. The support rod brackets are designed to counteract the ‘peel’ force—the lift and torque generated by wind trying to rip the visor off the cab at high speed. This dual-bracket system creates an extremely rigid, unmoving platform, which is essential for the longevity of the main shell.

جوهر 3: The ‘Integrated Systems’ منطق (Lamps & Dampers)

This logic group covers the non-structural components that are integrated *into* the غطاء السقف الكسوة الخارجية, demonstrating its role as a multi-function housing.

1. عنصر: ‘Speed lamp base assembly’ (5704180-أ01) – الكمية 1
هذا (شركات 7) is the mounting component for the cab’s “سرعة” أو “marker” lights. This proves the غطاء السقف الكسوة الخارجية (شركات 1) is molded with a specific cutout and mounting points to accept this electrical assembly.

The Integration Logic means the visor serves as a conduit and housing, protecting the wiring and the lamp base from the elements. The ‘assembly’ nature of the lamp base allows for easier servicing of the bulbs without having to detach the entire roof shell.

2. عنصر: ‘Limit tube – sun visor’ (5704047-242) – الكمية 8
هؤلاء (شركات 4) are arguably the most important parts for NVH (ضوضاء, اهتزاز, Harshness). These are not structural tubes; they are small, elastomeric (ممحاة) spacers or bushings.

The Damping Logic is their entire purpose. هؤلاء 8 tubes are placed between the plastic visor shell and the metal mounting brackets. They “float” the panel. They create a buffer that isolates the shell, absorbing the high-frequency vibrations from the engine and road.

Without these limit tubes, the vibration would transfer directly to the large plastic shell, causing it to rattle, resonate (hum), and eventually fatigue-crack. A lost or degraded limit tube is the most common cause of a rattling غطاء السقف الكسوة الخارجية.

جوهر 4: The ‘Vibration-Proof’ منطق (The Complete Fastener Set)

This final group details the 23 pieces of specialized hardware that hold the entire غطاء السقف الكسوة الخارجية together. The choice of fasteners is a deliberate engineering decision.

1. عنصر: ‘Combination bolt’ (CQ1460616F6) – الكمية 12
هؤلاء (شركات 8) are the main structural bolts. الاسم “مزيج” هو المفتاح: they have captive, pre-installed spring lock washers and flat washers. هؤلاء 12 bolts are likely used to secure the 4 main brackets (Comps 2, 3, 5, 6) to the cab.

2. عنصر: ‘Cross recessed… المسمار الجمع’ (Q2360620F6) – الكمية 3
هؤلاء (شركات 9) are smaller “combination screws,” also with locking washers. Their quantity of 3 strongly suggests they are the fasteners for the ‘Speed lamp base assembly’ (شركات 7).

3. عنصر: ‘Cross recessed… أفسد… حَشد’ (Q2360625F6B) – الكمية 8
هذا (شركات 10) hardware set’s quantity of 8 perfectly matches the 8 ‘Limit tubes’ (شركات 4). This confirms their partnership. هذا التجميع (a screw, غسالة الربيع, and flat washer) is the fastener that passes *through* the limit tubes to secure the shell to the brackets.

The Vibration-Proof Logic is the unifying theme. Every single fastener in this غطاء السقف الكسوة الخارجية system is a “combination” أو “حَشد” type that includes a spring washer. This is non-negotiable. The spring washer provides constant tension, locking the fastener and preventing it from loosening under the constant, severe vibration of a dump truck.

غطاء السقف الكسوة الخارجية: Complete 10-Part Breakdown

الجدول التالي يوفر كامل, تفصيل مفصل للجميع 10 أنواع المكونات في غطاء السقف الكسوة الخارجية (System 142) لفاو جيفانغ CA3250P66K2L1T1E 6×4 تفريغ الشاحنة.

المواصفات الأساسية

المواصفات ل غطاء السقف الكسوة الخارجية are defined by its complex role as an aerodynamic, الهيكلية, and electrical-housing assembly.