FAW Sub-Box Input Gear Assembly: تحليل خبير ل 5 المكونات الأساسية

مرحبًا بكم في هذا التحليل الفني الخبير لـ FAW Sub-Box Input Gear Assembly, الكامل “مدخل” group for the auxiliary “المربع الفرعي” of the manual transmission in the FAW Jiefang CA4251P66K24T1A3E5 6×4 جرار نصف مقطورة ديزل.

ال FAW Sub-Box Input Gear Assembly is the critical component that receives 100% of the power from the transmission’s main box and transfers it into the auxiliary box (the range/splitter section). This mechanism is what turns a 6-speed main box into a 12-speed transmission, providing the high and low ranges necessary for a heavy-duty tractor.

This guide is an essential resource for professional transmission rebuilders and parts specialists. سنقوم بتفكيك الكل FAW Sub-Box Input Gear Assembly فيه 5 مكونات صالحة للخدمة, including the main ‘Input Gear’ (1701431-A8P), its critical ‘Deep groove ball bearing’ (6218 NR/YA7), and the associated locating plates and circlips.

فهم “الصندوق الفرعي” منطق

لفهم FAW Sub-Box Input Gear Assembly, one must first understand the “المربع الفرعي,” also known as the auxiliary transmission or range box. Heavy-duty transmissions like the one in this FAW tractor are often “6+1” أو “8+1” speed main boxes. To achieve the 12, 16, أو 18 speeds needed for heavy hauling, this main box is bolted to a 2-speed “sub-box.”

This sub-box has two settings: “نطاق منخفض” (معدات التخفيض) و “نطاق عالي” (a direct drive). The driver shifts through the main box pattern (على سبيل المثال, 1-6) while in “قليل,” then flips a switch. This engages the sub-box synchronizer, shifting it from Low to High. The driver then shifts through the *same* 1-6 pattern again, which now function as gears 7-12.

ال FAW Sub-Box Input Gear Assembly (1701431-A8P) هو “الباب الأمامي” إلى هذا المربع الفرعي. It is in constant mesh with the output gear of the main transmission, and it is the component that all the synchronizers and gears inside the sub-box receive their power from. لذلك, this single gear and shaft assembly handles the full, multiplied torque of the engine in *every single gear*. Its durability is absolutely paramount, as a failure here renders the entire transmission inoperable. ال FAW Sub-Box Input Gear Assembly is a zero-failure-tolerance component.

المكون الأساسي: معدات الإدخال (1701431-A8P)

قلب ال FAW Sub-Box Input Gear Assembly is the ‘Input gear-sub box’ (1701431-A8P). هذا ضخم, helically-cut gear that is permanently integrated with its shaft. This component is forged from a single billet of high-manganese, حالة تصلب الصلب (like 18CrNiMo7-6) to provide an incredibly tough inner core that resists shock-load and an glass-hard outer surface that resists wear.

الحلزونية (بزاوية) cut of the gear teeth is a critical design choice for the FAW Sub-Box Input Gear Assembly. This design allows the gear teeth to engage gradually, which is significantly quieter than “spur” (straight-cut) التروس. والأهم من ذلك, the helical cut allows multiple teeth to be in mesh at the same time, spreading the immense torque load over a much larger surface area.

A chipped tooth on this single gear, often from a bad shift or driveline shock, هو فشل ذريع. It would send hardened steel fragments throughout the entire auxiliary transmission, destroying all other gears and bearings. وهذا يجعل FAW Sub-Box Input Gear Assembly‘s gear one of the most durable components in the driveline.

The Main Bearing: محمل كرة أخدود عميق (6218 NR/YA7)

The ‘Input gear-sub box’ shaft is supported by the ‘Deep groove ball bearing’ (6218 NR/YA7). This is the single most important component for the alignment and low-friction rotation of the entire FAW Sub-Box Input Gear Assembly.

ال “6218” designation indicates this is a large, heavy-duty bearing with a 90mm (3.54 في) bore. A ball bearing is used here because it is exceptionally good at handling both **Radial Loads** (the separating force from the helical gears) and **Axial Loads** (ال “التوجه” or push/pull force) في كلا الاتجاهين.

ال “NR/YA7” suffix is the most critical part:

• **ن:** Indicates a “snap ring groove” is machined into the *outer* race of the bearing.
• **ر:** Indicates that the “حلقة المفاجئة” (or circlip) *is included* with the bearing.

This snap ring is the “منطق” of the mounting system. The bearing is pressed onto the FAW Sub-Box Input Gear Assembly رمح. The entire assembly is then inserted into its precision bore in the transmission case. The snap ring (1701358-A7G) then fits into this “ن” أخدود, locking the *outer* race of the bearing to the case. This single ring prevents the entire FAW Sub-Box Input Gear Assembly from moving fore or aft.

A failure of this bearing is a primary cause of transmission failure. It is often first heard as a high-pitched “أنين” أو “ترعد” that is present in all gears and is tied to vehicle speed. If this bearing seizes or collapses, ال FAW Sub-Box Input Gear Assembly will be destroyed.

The Alignment System: Circlips and Locating Plate

The final three components of the FAW Sub-Box Input Gear Assembly are dedicated to precision alignment and “shimming” (setting the correct end-play).

**1. ‘Circlip-input gear bearing’ (1701357-A7G):** This is a large snap ring, or circlip. Its function is to lock the *inner* race of the 6218 bearing onto the ‘Input gear-sub box’ رمح. This prevents the shaft from sliding *out* of the bearing.

**2. ‘Locating ring-circlip’ (1701358-A7G):** This is the snap ring that fits into the “ن.ر” groove on the *outer* race of the 6218 تحمل. It locks the *outer* race of the bearing into the transmission case. These two circlips, one on the inner race and one on the outer, إنشاء أ “locked” assembly that is fixed to both the shaft and the case.

**3. ‘Locating plate-input gear bearing’ (1701432-A9K):** هذا هو “يربك” أو “كاب” that is often bolted over the bearing on one side. It serves two functions: it acts as a final, متكرر “قف” to prevent the bearing from moving, and it acts as an oil “slinger” or shield, protecting the bearing’s seal from direct splash and helping to channel lubrication into the bearing.

معاً, هؤلاء 5 components form the complete, صالحة للخدمة FAW Sub-Box Input Gear Assembly. A transmission rebuilder must replace these circlips, as re-using a “انتشرت” أو “fatigued” circlip is a major risk. If one fails and falls into the rotating gearset, it will destroy the entire transmission. ال FAW Sub-Box Input Gear Assembly relies on these small parts.

FAW Sub-Box Input Gear Assembly Parts List

الجدول التالي يوفر كامل, تفصيل مفصل للجميع 5 components identified in the ‘Sub-Box Input Gear Assembly’ رسم تخطيطي للجرار FAW CA4251P66K24T1A3E5. إعادة بناء كاملة لل FAW Sub-Box Input Gear Assembly requires these precision-matched parts.

المواصفات الفنية وسياق التجميع

المواصفات ل FAW Sub-Box Input Gear Assembly يتم تعريفها من خلال وظيفتها باعتبارها الابتدائي, constant-mesh input drive for the transmission’s auxiliary (يتراوح) قسم. ال FAW Sub-Box Input Gear Assembly هي مجموعة مطابقة الدقة.