FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي: انهيار شامل ل 16 أجزاء قابلة للخدمة

مرحبًا بك في هذا الدليل الفني الشامل حول FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي. This is a complete, load-bearing gear and shaft set for the main gearbox of the FAW Jiefang CA4251P66K24T1A3E5 6×4 جرار نصف مقطورة ديزل.

ال FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي, also known as the “counter-shaft,” is one of the most critical components in a heavy-duty transmission. It is part of a “twin-countershaft” تصميم, working in tandem with a second (lower left) shaft to split the engine’s torque, thereby doubling the gearbox’s strength.

This in-depth guide is an essential resource for professional transmission technicians and parts specialists. سنقوم بتفكيك الكل FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي فيه 16 مكونات صالحة للخدمة, including the main ‘Countershaft’ (1701211-A9P), all of its drive gears, the critical bearings, and all associated locking hardware.

ال “Twin-Shaft” Logic Explained

The main gearbox of this FAW tractor uses a **twin-countershaft** (أو “twin-shaft”) تصميم. This is the gold standard for heavy-duty applications. Instead of one large countershaft handling 100% of the engine’s torque, the load is “ينقسم” 50/50 between two smaller, identical countershafts.

هذا التجميع, ال FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي, is one of those two critical shafts. By splitting the torque, ال “separating forces” (the forces of the gear teeth trying to push each other apart) are balanced. This dramatically reduces the stress on the transmission housing and the bearings, allowing the gearbox to be lighter, more compact, and significantly more durable.

ال “منطق” of this system requires that both the FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي and its “Lower Left” twin are perfectly “توقيت” so that their helical gear teeth engage the main shaft gears at the exact same instant. If the timing is off by a single tooth, one shaft will take the entire load, leading to its rapid and catastrophic failure.

المكون الأساسي: The Countershaft (1701211-A9P)

The backbone of the FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي is the ‘Countershaft’ (1701211-A9P) نفسها. This is a single, massive, forged component made from high-carbon, case-hardened steel. It is designed to be the primary torque-bearing component in the main box.

Its function is to “counter” the rotation of the input shaft. The input shaft’s gear (see assembly 143) is in permanent, constant mesh with the “input drive gear” on this FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي. This means that any time the clutch is engaged and the engine is spinning, this countershaft is also spinning.

The shaft itself is precision-machined with multiple “steps,” splines, and bearing journals. The splines are used to mount the various drive gears, while the journals provide a mirror-smooth, ultra-hard surface for the main roller bearings to ride on. A bent or twisted countershaft is a catastrophic failure that requires a full transmission rebuild, making the integrity of this core FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي absolutely critical.

The Main Drive Gears (3rd, 4ذ, 5ذ, Reduction)

ال “منطق” التابع FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي is embodied in its set of fixed, constant-mesh drive gears. This parts list details the following:

• ‘3rd gear-countershaft’ (1701212-A9K)
• ‘4th gear-countershaft’ (1701213-A9K)
• ‘5th gear-countershaft’ (1701214-A9K)
• ‘Reduction gear-countershaft’ (1701217-A7G)

هذه هي “يقود” التروس. They are fixed (splined or press-fit) to the ‘Countershaft’ and are *always* spinning at the same speed as the shaft. They are in permanent, constant mesh with their corresponding “driven” التروس, which spin freely on the main shaft (ال “العمود الثاني”).

When the driver selects “3rd gear,” they are actually engaging a clutch (أ “synchronizer”) that locks the *freewheeling 3rd gear* to the main shaft. The power flow is then from the input gear, إلى FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي, through this ‘3rd gear-countershaft’, to the main shaft, and out to the wheels. These helically-cut gears are designed for quiet, high-torque operation.

Bearing and Alignment System

كامل FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي is supported at both ends by heavy-duty bearings.

• **Front Bearing (1701205-A2V-C00):** This ‘Cylindrical roller bearing with stop ring’ supports the front of the countershaft. إنه أ “roller” تحمل, designed for extreme radial loads. ال “stop ring” (a circlip) أمر بالغ الأهمية, as it locks the bearing’s outer race into the front transmission housing, setting the shaft’s position.
• **Rear Bearing (1701215-A2V-C00):** This ‘Cylindrical roller bearing’ supports the rear of the shaft inside the main housing.

These bearings are protected by “baffles,” which are oil slingers. The ‘Baffle-countershaft front bearing’ (1701233-A7G) and ‘Baffle-countershaft rear bearing’ (1701233-A9P) are secured by ‘Hex head bolts’ (CQ1511235S, CQ1511645S). These discs spin with the shaft, flinging oil *away* from the bearing seals, preventing leaks and ensuring a long service life for the FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي.

أخيراً, the ‘Circlip-reduction gear’ (1701229-A7G) and ‘Spacer’ (1701247-A7K) are used to lock the ‘Reduction gear’ in its precise location on the shaft. The ‘Woodruff Key’ (1701226-A7G), ‘Flat Key’ (1701228-A7G), and ‘Spring dowel pin’ (Q5280510) are all used to physically lock the various gears to the shaft, ensuring they cannot spin freely and that 100% of the torque from the FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي is transferred.

FAW Upper Right Centre Shaft Assembly Of The Main Box Parts List

الجدول التالي يوفر كامل, تفصيل مفصل للجميع 16 components identified in the ‘Main Box Upper Right Centre Shaft Assembly’ رسم تخطيطي للجرار FAW CA4251P66K24T1A3E5. هذا FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي is a key to the transmission’s torque capacity.

المواصفات الفنية وسياق التجميع

المواصفات ل FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي are defined by its function as the core, torque-handling gear cluster of the transmission. كامل FAW مجموعة عمود المركز الأيمن العلوي للصندوق الرئيسي is a precision-balanced and matched set.