Главный блок FAW, левый нижний центральный вал в сборе: Внутри 14 Критически важные компоненты, которые управляют этим

Добро пожаловать в это важное техническое руководство по Главный блок FAW, левый нижний центральный вал в сборе (Часть №. 1701271-A2V). Это полный, load-bearing gear and shaft set for the main gearbox of the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач.

The Главный блок FAW, левый нижний центральный вал в сборе, also known as a “counter-shaft,” is the literal workhorse of the transmission. This gearbox uses a “twin-countershaft” дизайн, meaning it splits the engine’s torque between this shaft and an “Upper Right” вал. This design is the key to its heavy-duty torque capacity.

This in-depth guide is an essential resource for professional transmission technicians and parts specialists. Мы разберем всю Главный блок FAW, левый нижний центральный вал в сборе в свой 14 исправные компоненты, including the main shaft, all of its drive gears, the critical bearings, and all associated locking hardware.

The “Twin-Shaft” Logic Explained

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

Эта сборка, а Главный блок FAW, левый нижний центральный вал в сборе, is one of those two critical shafts. By splitting the torque, а “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.

The “логика” of this system requires that both the Главный блок FAW, левый нижний центральный вал в сборе и его “Upper Right” twin are perfectly “рассчитанный по времени” so that their helical gear teeth engage the main shaft 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.

Основной компонент: The ‘Left Countershaft’ (1701271-A2V)

Основа Главный блок FAW, левый нижний центральный вал в сборе is the ‘Left countershaft’ (1701271-A2V). Это сингл, 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 is in permanent, constant mesh with the “input drive gear” on this Главный блок FAW, левый нижний центральный вал в сборе. 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 Главный блок FAW, левый нижний центральный вал в сборе absolutely critical.

The Main Drive Gears (3р-д, 4й, 5й, Reduction)

The “логика” принадлежащий Главный блок FAW, левый нижний центральный вал в сборе is embodied in its set of fixed, constant-mesh drive gears. This parts list details the following:

• ‘3rd gear-countershaft’ (1701212-А9К)
• ‘4th gear-countershaft’ (1701213-А9К)
• ‘5th gear-countershaft’ (1701214-А9К)
• ‘Reduction gear-countershaft’ (1701217-A7G)

Это “водить машину” шестерни. They are fixed (splined or press-fit) to the ‘Left Countershaft’ and are *always* spinning at the same speed as the shaft. They are in permanent, constant mesh with their corresponding “управляемый” шестерни, which spin freely on the main shaft (а “второй вал”).

Когда водитель выбирает “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 Главный блок FAW, левый нижний центральный вал в сборе, 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

Весь Главный блок FAW, левый нижний центральный вал в сборе is supported at both ends by heavy-duty bearings.

• **Front Bearing (1701225-A2V-C00):** This ‘Cylindrical roller bearing with stop ring’ supports the front of the countershaft. Это “roller” несущий, designed for extreme radial loads. The “stop ring” (a circlip) имеет решающее значение, 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 rear bearing’ (1701233-A9p) is secured by a ‘Hex head bolt’ (CQ1511235S). This disc spins with the Главный блок FAW, левый нижний центральный вал в сборе and flings oil *away* from the rear bearing seal, preventing leaks and ensuring a long service life.

Окончательно, 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 Главный блок FAW, левый нижний центральный вал в сборе is transferred.

FAW Main Box Left-Lower Centre Shaft Assembly Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 14 components identified in the ‘Main Box Left-Lower Centre Shaft Assembly’ схема трактора FAW CA4251P66K24T1A3E5. Этот Главный блок FAW, левый нижний центральный вал в сборе is a key to the transmission’s torque capacity.

Технические характеристики и контекст сборки

Технические характеристики Главный блок FAW, левый нижний центральный вал в сборе are defined by its function as the core, torque-handling gear cluster of the transmission. Весь Главный блок FAW, левый нижний центральный вал в сборе is a precision-balanced and matched set.