- Ciudad de ChangChun, Provincia de Jilin, Porcelana
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Bienvenido a esta guía técnica crítica sobre la Conjunto de marcha atrás FAW, el completo “ocioso” gearset for the manual transmission in the FAW Jiefang CA4251P66K24T1A3E5 6×4 tractor semirremolque diésel. This assembly is solely responsible for enabling the vehicle to move backward.
El Conjunto de marcha atrás FAW is a high-strength gear system with a simple but critical logic. It is not in constant mesh with the main gearset. En cambio, it is a separate “ocioso” gear that is physically moved into place by the driver’s shift linkage, intentionally reversing the flow of power to the main shaft.
This in-depth guide is an essential resource for professional transmission technicians and parts specialists. Deconstruiremos todo Conjunto de marcha atrás FAW en su 5 componentes reparables, including the ‘Reverse idler gear’ (1701481-A7G), the ‘Idler shaft’ (1701482-A0L), its ‘Needle roller bearing’, and all critical locating hardware.
El corazón de la Conjunto de marcha atrás FAW is the ‘Reverse idler gear’ (1701481-A7G). Este es un trabajo pesado, forged steel gear that is precisely engineered to handle the high-torque, low-speed demands of moving a fully-loaded tractor in reverse.
Unlike the helical-cut (angular) gears used for forward motion (which are quiet and smooth), this gear is typically a “estimular” engranaje, with straight-cut teeth. This straight-cut design is mechanically simpler and incredibly strong, able to withstand the high shock-load of being “slid” into mesh. This is what produces the characteristic “gimoteo” sound when driving in reverse.
When the driver selects reverse, a shift fork slides this ‘Reverse idler gear’ into a very specific position: *between* the counter-shaft’s reverse drive gear and the main shaft’s reverse synchronizer sleeve. Este es el “lógica” del Conjunto de marcha atrás FAW. By introducing a third gear into the power path (Counter-shaft -> Idler Gear -> Eje principal), it reverses the direction of the main shaft, causing the truck to move backward.
The teeth on this gear must be perfectly formed and hardened. A chipped or broken tooth on this single gear will make reverse inoperable and will send hardened steel fragments throughout the entire transmission, destroying other gears and bearings. This makes the quality of the Conjunto de marcha atrás FAW‘s main gear critical.
El engranaje loco de marcha atrás’ does not float; it spins on the ‘Idler shaft’ (1701482-A0L). This is the stationary “eje” para todo Conjunto de marcha atrás FAW. This shaft is a large-diameter, precision-ground, and case-hardened steel rod.
This shaft is mounted securely (often press-fit or bolted) into the transmission housing. It must be perfectly parallel to the main shaft and counter-shaft to ensure that when the idler gear slides into mesh, the gear teeth are perfectly aligned.
Any wear, tanteo, or bending on this shaft is a critical failure. If the shaft is worn, the idler gear will be able to “tambalearse” on its axis. This wobble will cause a loud, growling noise in reverse and, more dangerously, will prevent the gear teeth from meshing correctly. This can cause the gear to “pop out” under load or, in a worst-case scenario, shatter the gear teeth. The ‘Idler shaft’ is the rigid foundation of the Conjunto de marcha atrás FAW.
El engranaje loco de marcha atrás’ (1701481-A7G) must be able to spin freely on the ‘Idler shaft’ with minimal friction. This is the job of the ‘Needle roller bearing’ (1701485-A7G). This is the key “antifricción” componente de la Conjunto de marcha atrás FAW.
This bearing is a “caged” set of small-diameter steel rollers (needles). It is pressed into the bore of the idler gear. This design is chosen for its extremely high **radial load capacity** in a very compact space. It allows the gear to support the immense separating forces created when the gear teeth are under torque.
This bearing is lubricated by the transmission’s “splash” oiling system. A failure of this bearing is a common fault in a high-mileage Conjunto de marcha atrás FAW. It is typically diagnosed as a loud, agudo “gimoteo” o “rumble” that only occurs when the truck is in reverse (either moving or stationary with the clutch out). If this bearing collapses, the gear will seize to the shaft or be destroyed, resulting in a total loss of reverse.
Los dos últimos componentes del Conjunto de marcha atrás FAW are responsible for “juego final” control and security.
**’Gasket/Washer – engranaje loco de marcha atrás’ (1701487-A7G):** La lista de piezas requiere dos de estos.. These are not “juntas”; they are **thrust washers**. estos estan endurecidos, precision-ground, and polished steel washers that are placed on either side of the idler gear (between the gear and the transmission case/circlip). Their job is to absorb the **axial load** (the fore-and-aft force) that is generated as the gear is slid into mesh. They provide a low-friction, replaceable wear surface. Worn-out thrust washers are a primary cause of a “sloppy” shifter feel or a transmission that “jumps” out of reverse.
**’Circlip – eje loco inverso’ (1701488-A7G):** This is the final retaining component. This large “snap ring” (circlip) is fitted into a groove cut into the ‘Idler shaft’. It acts as the final “hard stop,” preventing the entire assembly (the gear, cojinete, and thrust washers) from sliding off the end of the shaft. It is a single-use part; a fatigued circlip that is re-used can fail, allowing the entire Conjunto de marcha atrás FAW to fall apart inside the transmission.
La siguiente tabla proporciona la información completa, desglose detallado de todos 5 components identified in the ‘Reverse Gear Assembly’ diagrama para el tractor FAW CA4251P66K24T1A3E5. A rebuild of the Conjunto de marcha atrás FAW requires replacing all bearings, washers, y circlips.
| Marca | Número de pieza. | Nombre de la pieza | Cantidad |
|---|---|---|---|
| 1 | 1701488-A7G | clip de seguridad – eje loco inverso | 1 |
| 2 | 1701487-A7G | Gasket/Washer – engranaje loco de marcha atrás | 2 |
| 3 | 1701482-A0L | Idler shaft | 1 |
| 4 | 1701485-A7G | Needle roller bearing | 1 |
| 5 | 1701481-A7G | Engranaje loco de marcha atrás | 1 |
Las especificaciones para el Conjunto de marcha atrás FAW se definen por su función como un alto par, sliding-mesh idler gear system. todo el Conjunto de marcha atrás FAW is a matched set of components.
| Solicitud de vehículo | FAW Jiefang CA4251P66K24T1A3E5 6×4 Tractor |
| Grupo de componentes | Conjunto de marcha atrás FAW |
| Main Gear P/N | 1701481-A7G (Engranaje loco de marcha atrás) |
| Main Shaft P/N | 1701482-A0L (Idler shaft) |
| Bearing Type | 1x Needle roller bearing (1701485-A7G) |
| Gear Type | Spur-Cut (Straight-Cut) Engranaje loco |
| Actuation Method | Sliding-Mesh (via Shift Fork) |
| Control de empuje | 2x Thrust Washers (1701487-A7G) |
| Security Fastener | 1x Circlip (1701488-A7G) |
| Función primaria | To be inserted between the counter-shaft and main shaft, reversing the direction of power flow. |
piezas FAW, incluido el conjunto del bloque de cilindros, Se empaquetan con cuidado para garantizar una entrega segura.. Cada componente está asegurado con materiales protectores para evitar daños durante el transporte.. La red logística garantiza envíos puntuales en todo el mundo., apoyando operaciones de mantenimiento eficientes. A continuación se muestra una imagen que ilustra el embalaje estándar de las piezas de camiones FAW., mostrando la atención al detalle en el manejo y almacenamiento.
Este enfoque de embalaje minimiza el riesgo de corrosión o daños por impacto., asegurando que piezas como el conjunto de bloque de cilindros FAW lleguen en perfectas condiciones. Los clientes pueden confiar en la logística de FAW para obtener calidad y confiabilidad constantes.
FAW es uno de los fabricantes de automóviles más grandes y antiguos de China, con capital registrado de RMB 35.4 mil millones de yuanes y activos totales de RMB 457.83 mil millones de yuanes.
CHINA FAW GROUP CO., LIMITADO. (abreviatura de FAW), anteriormente China First Automobile Works, puede rastrear sus raíces hasta julio 15, 1953, cuando comenzó a construirse su primera planta de ensamblaje. FAW es uno de los fabricantes de automóviles más grandes y antiguos de China, con capital registrado de RMB 35.4 mil millones de yuanes y activos totales de RMB 457.83 mil millones de yuanes.
Ventas globales de camiones pesados en China “cinco seguidos”, ventas de camiones pesados a nivel mundial “seis seguidos”, venta de tractores para 16 años consecutivos líder absoluto en la industria.
