Arbre d'entraînement du pont central: Déconstruction 10 Pièces critiques pour une fiabilité ultime de la transmission

This technical guide provides a complete deconstruction of the Arbre d'entraînement du pont central assemblage pour le FAW Jiefang CA3250P66K2L1T1E 6×4 tombereau. Nous analyserons le 10 distinct types of serviceable components that create this critical link, which is essential for transferring torque from the inter-axle differential to the middle axle.

Le Arbre d'entraînement du pont central, also known as an inter-axle propshaft, is a high-speed, high-torque component. Its function is to connect the truck’s transfer case (or inter-axle differential) output to the input pinion of the first (milieu) essieu arrière. This specific shaft is relatively short but must endure extreme angles and high rotational speeds, especially when the 6×4 axle lock is engaged. This deconstruction focuses on the serviceable units, providing a clear path for technicians to perform rebuilds and maintenance, which is crucial for maximizing vehicle uptime and ensuring the reliability of the tandem-axle system.

Cœur 1: Le “Articulation” Logique (The Universal Joint Assemblies)

The U-joint is the component that allows the Arbre d'entraînement du pont central to transmit power smoothly across constantly changing angles. This assembly uses two complete U-joints (one at each end), which are constructed from five key serviceable part types.

1. Composant: ‘Cross and needle roller bearing assy’ (2205030B761) – Quantité 2
Ce (Comp 5) is the core of the U-joint, often called the cross or spider. It includes four precision-ground trunnions (bras) and four pre-packaged needle roller bearing caps. These caps are pressed into the yokes and retain the grease that is critical for smooth, low-friction articulation. Failure of these bearings is a primary cause of Arbre d'entraînement du pont central vibration.

2. Composant: ‘Flange yoke’ (2205023B761) – Quantité 2
Ce (Comp 2) is the flange that physically connects the U-joint to the vehicle’s flanges (Par exemple, at the inter-axle differential and the middle axle pinion). Le Arbre d'entraînement du pont central assembly requires two of these, one for each U-joint.

3. Composant: Groupe de fixations (Q32914 & Q1851455T) – Quantité 8 chaque
This group includes the ‘Type I non-metallic insert hex lock nut’ (Comp 1) and the ‘Hexagon flange bolt’ (Comp 3). Ce Logique de fixation est un système critique pour la sécurité. The non-metallic insert in the nut provides prevailing torque, empêchant les boulons de vibrer desserrés. This is essential for a high-RPM component like the Arbre d'entraînement du pont central.

4. Composant: ‘Circlip’ (2205041-A0M) – Sélectionner 8
Ce (Comp 4) is a precision-fit circlip, or snap ring. The Bill of Materials (Nomenclature) specifies ‘Select 8’ and lists multiple sub-part numbers (2205042-A0M, 2205043-A0M, etc.). Ce Selective Fit Logic is vital for assembly. A technician must select a circlip of a specific thickness to achieve the exact, minimal end-play for the U-joint bearing caps. Using the wrong thickness will lead to either immediate binding or premature failure from excessive movement.

Cœur 2: Le “Longueur & Couple” Logique (The Shaft Body Assembly)

This group of components forms the main body of the Arbre d'entraînement du pont central. It is responsible for handling the “plunge” (dynamic length change) as the axles articulate and for transferring the full torque load.

1. Composant: ‘Rear axle drive shaft weld yoke, spline tube and yoke assy’ (2201015-51B) – Quantité 1
Ce (Comp 8) est le principal composant structurel. It consists of the main driveshaft tube, which is permanently welded to a yoke at one end and a spline tube (an internal spline) at the other. Ce Welded Logic is a design choice for maximum strength and rigidity. The welds ensure the yokes and tube act as a single piece, allowing them to transfer immense torque without failure. This is the backbone of the Arbre d'entraînement du pont central.

2. Composant: ‘Spline shaft yoke assy’ (2205020B761) – Quantité 1
Ce (Comp 6) is the ‘slip yoke’. It is a yoke (which holds the other U-joint) that is permanently attached to a matching external spline shaft. This external spline is designed to slide, or plunge, in and out of the spline sleeve (Comp 8).

Ce Plunge Logic is essential for a tandem-axle truck. As the axles articulate over uneven terrain, the distance between them and the transfer case changes. This slip-yoke assembly allows the Arbre d'entraînement du pont central to change length dynamically. This prevents the assembly from binding and destroying the U-joints, transfer case bearings, or axle pinion bearings.

3. Composant: ‘Grease nipple’ (CQ70001) – Quantité 1
Ce (Comp 7) is a standard ‘zerk’ convenable. It is threaded into the slip-yoke assembly (Comp 6) to allow for periodic lubrication of the internal and external splines. Regular greasing is the most important maintenance step to prevent the splines from fretting, corroding, or seizing. A dry slip yoke is a common cause of Arbre d'entraînement du pont central échec.

Cœur 3: Le “High-Speed Stability” Logique (The Balancing System)

This final component group is dedicated to a single, critical purpose: high-speed rotational stability. Un déséquilibré Arbre d'entraînement du pont central will cause destructive, harmonic vibrations throughout the entire vehicle.

1. Composant: ‘Balance plate’ (2205071C6H & 2205071-A0M) – Quantité selon demande.
Ce (Comp 9 and Comp 10) are two different types of precisely weighted metal plates. The BOM lists multiple variations for each type and a quantity of ‘As Required’. This indicates the Dynamic Balancing Logic.

After the full Arbre d'entraînement du pont central is assembled, it is spun on a high-speed balancing machine. Electronic sensors detect micro-imbalances. A technician then spot-welds these balance plates (Comp 9 or Comp 10) onto the shaft body (Comp 8) to counteract any heavy spots.

This precision balancing is the final step in manufacturing and is essential for a smooth, vibration-free operation. A shaft that has lost a balance weight will cause immediate and severe vibration, which can quickly destroy seals, roulements, and U-joints. Cela rend le Arbre d'entraînement du pont central a precision-tuned component.

Arbre d'entraînement du pont central: Complete 10-Part Serviceable Breakdown

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 10 serviceable component types in the Arbre d'entraînement du pont central assemblage pour le FAW Jiefang CA3250P66K2L1T1E 6×4 tombereau. Components listed as ‘As Required’ or ‘Select’ are precision-fitting parts that must be chosen by the technician to meet build specifications.

Spécifications de base

The specifications for this Arbre d'entraînement du pont central are defined by its role as a high-torque, high-angle inter-axle connector. Understanding these specifications is key to ordering the correct assembly for the tandem-axle drivetrain.