- Чанчунь город, Провинция Цзилинь, Китай
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Welcome to this comprehensive technical analysis of the FAW Main Box Centre Shaft Assembly Component, the complete counter-shaft gear cluster for the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. This assembly is the literal “рабочая лошадка” inside the transmission.
The FAW Main Box Centre Shaft Assembly Component (also known as the counter-shaft) is responsible for taking the single input speed from the engine’s clutch and “splitting” it into multiple gear ratios. It is in constant mesh with the input shaft and the main shaft, handling 100% of the engine’s torque.
This in-depth guide is an essential resource for professional transmission rebuilders and parts specialists. Мы разберем всю FAW Main Box Centre Shaft Assembly Component в свой 16 исправные части, including the main shaft, all drive gears, the critical bearings, and the hardware that holds it all in perfect alignment.
The backbone of the FAW Main Box Centre Shaft Assembly Component is the ‘Countershaft’ (1701211-A9p) сам. Это сингл, massive, forged component made from high-carbon, case-hardened steel. It is designed to be the primary torque-bearing shaft in the transmission.
Its function is to “counter” the rotation of the input shaft. The input shaft’s gear (1701121-А0Л, from the previous assembly) is in constant, permanent mesh with one of the gears on this FAW Main Box Centre Shaft Assembly Component. 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 “шаги,” 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 Main Box Centre Shaft Assembly Component absolutely critical.
The “логика” принадлежащий FAW Main Box Centre Shaft Assembly Component is embodied in its drive gears. This parts list details the main set of constant-mesh gears:
Это “водить машину” шестерни. They are fixed (splined or press-fit) to the countershaft and are *always* spinning at the same speed as the countershaft. They are in permanent, constant mesh with their corresponding “управляемый” шестерни, which spin freely on the main shaft. When the driver selects “3третья передача,” they are actually engaging a clutch (а “синхронизатор”) that locks the *freewheeling 3rd gear* to the main shaft. The power flow is then from the input gear, к FAW Main Box Centre Shaft Assembly Component, through this ‘3rd gear-countershaft’ (1701212-А9К), to the main shaft, and out to the wheels.
These gears are “helically cut” (with angled teeth). This is a critical design choice for a heavy-duty FAW Main Box Centre Shaft Assembly Component. The angled teeth engage gradually and smoothly, which is far quieter than “straight-cut” spur gears. This design also allows for more than one tooth to be in contact at any given time, spreading the immense torque load over a wider surface area and providing superior strength.
The ‘Reduction gear-countershaft’ (1701217-А0Л) is another critical drive gear within the FAW Main Box Centre Shaft Assembly Component. This is typically the “низкий” или “creeper” механизм, providing the maximum torque multiplication for starting the truck from a dead stop, especially on a hill.
This gear must be precisely located on the shaft. This is the job of the ‘Spacer’ (1701247-A7K) and the ‘Circlip-reduction gear’ (1701229-A7G). The spacer is a hardened steel sleeve that provides the correct “stand-off” distance from the other gears, while the circlip (а “snap ring”) fits into a groove on the shaft to lock the gear in its final fore-and-aft position.
Этот FAW Main Box Centre Shaft Assembly Component is held together by various keys, including the ‘Woodruff Key’ (1701226-A7G) and ‘Flat Key’ (1701228-A7G). These small steel parts sit in a slot on the shaft and a corresponding slot in the gear, physically locking the two together to transfer all rotational torque. The ‘Spring Dowel Pin’ (Q5280510) is also used to pin one of the components, like the spacer, на месте.
Весь FAW Main Box Centre Shaft Assembly Component spins at engine speed, supported at both ends by massive bearings that are pressed into the transmission housing.
**Front Bearing (NU309NRB1/YA6):** This is the ‘Cylindrical roller bearing with stop ring’. This heavy-duty roller bearing supports the front of the countershaft. It is designed to handle extreme *radial* loads (the separating force from the gears). The “stop ring” (a circlip on its outer race) имеет решающее значение, as it locks the bearing into the transmission case, setting the “end-play” на весь FAW Main Box Centre Shaft Assembly Component.
**Rear Bearing (1701235-A9p):** This is the ‘Cylindrical roller bearing’ that supports the rear of the shaft. It sits in a precision-bored hole in the mid-housing.
**Baffles (1701233-A7G / 1701233-A9p):** These bearings are protected by the ‘Baffle-countershaft front bearing’ and ‘Baffle-countershaft rear bearing’. Это “slinger” discs. As the transmission’s gear oil is violently splashed around, these baffles, which spin with the shaft, sling the oil *away* from the bearing seals. This prevents them from being overwhelmed and failing, which would allow the gear oil to leak out and the bearing to run dry. This is a critical durability feature of the FAW Main Box Centre Shaft Assembly Component, and these baffles are secured by the ‘Hex head bolts’ (CQ1511645S, CQ1511235S).
В следующей таблице представлена полная, подробная разбивка всех 16 components identified in the ‘Main Box Centre Shaft Assembly Component’ схема трактора FAW CA4251P66K24T1A3E5. The proper assembly of this FAW Main Box Centre Shaft Assembly Component is key to a quiet, reliable transmission.
| Отметка | Часть №. | Наименование | Количество |
|---|---|---|---|
| 1 | 1701233-A9p | перегородка – countershaft rear bearing | 1 |
| 2 | 1701235-A9p | Cylindrical roller bearing | 1 |
| 3 | 1701211-A9p | Промежуточный вал | 1 |
| 4 | 1701226-A7G | Woodruff key | 1 |
| 5 | Q5280510 | Spring dowel pin | 1 |
| 6 | 1701228-A7G | Flat key | 1 |
| 7 | 1701212-А9К | 3rd gear-countershaft | 1 |
| 8 | 1701213-А9К | 4th gear-countershaft | 1 |
| 9 | 1701214-A1K | 5th gear-countershaft | 1 |
| 10 | 1701247-A7K | Проставка | 1 |
| 11 | 1701217-А0Л | Reduction gear-countershaft | 1 |
| 12 | 1701229-A7G | Circlip-reduction gear | 1 |
| 13 | NU309NRB1/YA6 | Cylindrical roller bearing with stop ring | 1 |
| 14 | 1701233-A7G | Baffle-countershaft front bearing | 1 |
| 15 | CQ1511645S | Болт с шестигранной головкой | 1 |
| 16 | CQ1511235S | Болт с шестигранной головкой | 1 |
Технические характеристики FAW Main Box Centre Shaft Assembly Component are defined by its function as the core, torque-handling gear cluster of the transmission. Весь FAW Main Box Centre Shaft Assembly Component is a precision-balanced and matched set.
| Приложение для автомобиля | FAW Цзефан CA4251P66K24T1A3E5 6×4 Трактор |
| Группа компонентов | FAW Main Box Centre Shaft Assembly Component |
| Общее имя | Countershaft Assembly / Промежуточный вал |
| Main Shaft P/N | 1701211-A9p |
| Gear Set | 3р-д (А9К), 4й (А9К), 5й (A1K), Reduction (А0Л) |
| Gear Type | Constant-Mesh, Helical-Cut |
| Front Bearing P/N | NU309NRB1/YA6 (Roller Bearing w/ Stop Ring) |
| Rear Bearing P/N | 1701235-A9p (Cylindrical Roller Bearing) |
| Bearing Protection | Передний (A7G) & Задний (A9p) Baffles |
| Основная функция | To receive input torque and create multiple gear ratios by driving the main shaft gears. |
Запчасти ФАВ, включая блок цилиндров в сборе, тщательно упакованы, чтобы обеспечить безопасную доставку. Каждый компонент закреплен защитными материалами для предотвращения повреждений при транспортировке.. Логистическая сеть гарантирует своевременную доставку по всему миру., поддержка эффективных операций по техническому обслуживанию. Ниже приведено изображение, иллюстрирующее стандартную упаковку запчастей для грузовиков FAW., демонстрация внимания к деталям в обращении и хранении.
Такой подход к упаковке сводит к минимуму риск коррозии или ударного повреждения., обеспечение доставки таких деталей, как блок цилиндров FAW в сборе, в идеальном состоянии.. Клиенты могут положиться на логистику FAW для обеспечения стабильного качества и надежности..
FAW — один из старейших и крупнейших производителей автомобилей в Китае., с уставным капиталом в юанях 35.4 млрд юаней и общие активы юаней 457.83 миллиард юаней.
КИТАЙСКАЯ ГРУППА FAW CO., ООО. (сокращение от FAW), бывший Китайский первый автомобильный завод, можно проследить его корни до июля 15, 1953, когда началось строительство первого сборочного завода. FAW — один из старейших и крупнейших производителей автомобилей в Китае., с уставным капиталом в юанях 35.4 млрд юаней и общие активы юаней 457.83 миллиард юаней.
Продажи тяжелых грузовиков в Китае по всему миру “пять подряд”, продажи тяжелых грузовиков по всему миру “шесть подряд”, продажа тракторов для 16 годы подряд абсолютный лидер отрасли.
