Conjunto do eixo central esquerdo-inferior da caixa principal FAW: Dentro do 14 Componentes críticos que o impulsionam

Bem-vindo a este guia técnico crítico sobre o Conjunto do eixo central esquerdo-inferior da caixa principal FAW (Parte não. 1701271-A2V). Este é um completo, load-bearing gear and shaft set for the main gearbox of the FAW Jiefang CA4251P66K24T1A3E5 6×4 trator semirreboque diesel.

O Conjunto do eixo central esquerdo-inferior da caixa principal FAW, também conhecido como “contra-eixo,” is the literal workhorse of the transmission. This gearbox uses a “contraeixo duplo” projeto, meaning it splits the engine’s torque between this shaft and an “Upper Right” haste. This design is the key to its heavy-duty torque capacity.

Este guia detalhado é um recurso essencial para técnicos profissionais de transmissão e especialistas em peças.. Vamos desconstruir todo Conjunto do eixo central esquerdo-inferior da caixa principal FAW em seu 14 componentes reparáveis, incluindo o eixo principal, all of its drive gears, the critical bearings, and all associated locking hardware.

O “Twin-Shaft” Logic Explained

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

Esta montagem, o Conjunto do eixo central esquerdo-inferior da caixa principal FAW, is one of those two critical shafts. By splitting the torque, o “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.

O “lógica” of this system requires that both the Conjunto do eixo central esquerdo-inferior da caixa principal FAW e seu “Upper Right” twin are perfectly “cronometrado” 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.

Componente principal: The ‘Left Countershaft’ (1701271-A2V)

A espinha dorsal do Conjunto do eixo central esquerdo-inferior da caixa principal FAW is the ‘Left countershaft’ (1701271-A2V). Este é um único, enorme, forged component made from high-carbon, aço endurecido. 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, malha constante com o “input drive gear” on this Conjunto do eixo central esquerdo-inferior da caixa principal FAW. 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 “passos,” 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 Conjunto do eixo central esquerdo-inferior da caixa principal FAW absolutely critical.

The Main Drive Gears (3terceiro, 4th, 5th, Redução)

O “lógica” do Conjunto do eixo central esquerdo-inferior da caixa principal FAW 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)

Estes são os “dirigir” engrenagens. They are fixed (estriado ou 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 “dirigido” engrenagens, which spin freely on the main shaft (o “segundo eixo”).

Quando o motorista seleciona “3terceira marcha,” they are actually engaging a clutch (a “sincronizador”) that locks the *freewheeling 3rd gear* to the main shaft. The power flow is then from the input gear, para o Conjunto do eixo central esquerdo-inferior da caixa principal FAW, 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

O inteiro Conjunto do eixo central esquerdo-inferior da caixa principal FAW is supported at both ends by heavy-duty bearings.

• **Rolamento Dianteiro (1701225-A2V-C00):** This ‘Cylindrical roller bearing with stop ring’ supports the front of the countershaft. É um “roller” consequência, designed for extreme radial loads. O “anel de parada” (a circlip) é crítico, as it locks the bearing’s outer race into the front transmission housing, setting the shaft’s position.
• **Rolamento traseiro (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 Conjunto do eixo central esquerdo-inferior da caixa principal FAW and flings oil *away* from the rear bearing seal, preventing leaks and ensuring a long service life.

Finalmente, 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% do torque do Conjunto do eixo central esquerdo-inferior da caixa principal FAW is transferred.

FAW Main Box Left-Lower Centre Shaft Assembly Parts List

A tabela a seguir fornece o completo, detalhamento de todos 14 components identified in the ‘Main Box Left-Lower Centre Shaft Assembly’ diagrama para o trator FAW CA4251P66K24T1A3E5. Esse Conjunto do eixo central esquerdo-inferior da caixa principal FAW is a key to the transmission’s torque capacity.

Especificações Técnicas e Contexto de Montagem

As especificações para o Conjunto do eixo central esquerdo-inferior da caixa principal FAW are defined by its function as the core, torque-handling gear cluster of the transmission. O inteiro Conjunto do eixo central esquerdo-inferior da caixa principal FAW is a precision-balanced and matched set.