Arbre central supérieur gauche du sous-boîte: Déconstruction 4 Pièces critiques pour un entraînement auxiliaire impeccable

Welcome to this specialized technical analysis of the Arbre central supérieur gauche du sous-boîte, a critical component within the CA10TA160M 10-speed transmission. Ce composant est indispensable pour le FAW Jiefang CA3250P66K2L1T1E 6×4 tombereau. Ce guide déconstruit le 4 composants qui forment l'ensemble Arbre central supérieur gauche du sous-boîte assembly for professional service.

Le Arbre central supérieur gauche du sous-boîte is a high-torque countershaft, ou “layshaft,” for the auxiliary (Hi/Lo range) section of the gearbox. Its logic is to receive power from the main box and transmit it to the final output gears, enabling the 10-speed “range split” function that is critical for a heavy-duty dump truck.

Cœur 1: Le “Arbre & Engrenage d'entraînement” Logique (The Core Assembly)

This component is the literal foundation of the Arbre central supérieur gauche du sous-boîte assemblée. C'est un seul, integrated part that provides the “conduire” for the auxiliary gearbox.

1. Composant: ‘Welded intermediate shaft assy – boîte auxiliaire’ (1701515-A7G)
Ce (Comp 4) est le composant central. The name ‘Welded intermediate shaft assy’ (焊接中间轴总成) tells us exactly what it is. C'est le Arbre central supérieur gauche du sous-boîte lui-même, and it is a non-serviceable assembly, meaning the gear(s) are permanently welded to the shaft.

Le Welded Logic is a design choice for extreme strength. Instead of using splines or keys that can shear under high torque, the manufacturer has welded the gear(s) directly to the shaft. This creates a single, solid piece of steel that can withstand the immense, low-speed torque multiplication of the dump truck’s range box.

Le Logique de l'arbre intermédiaire est sa fonction. Ce Arbre central supérieur gauche du sous-boîte agit comme le “countershaft” ou “layshaft” for the auxiliary gearbox. It receives power from the ‘Sub-Box Drive Gear’ (which is connected to the mainshaft) et, à son tour, its gear(s) are in constant mesh with the Hi/Lo range gears on the final output shaft.

Ce Arbre central supérieur gauche du sous-boîte is one of several (Par exemple, Supérieur gauche, En haut à droite) that form a robust, power-splitting design. Ce “multi-countershaft” layout is the key to the CA10TA160M’s high torque capacity, as it distributes the load across multiple gear contact points instead of just one.

Cœur 2: Le “Palier & Soutien” Logique (Le système de montage)

This group represents the complete bearing assembly that supports the Arbre central supérieur gauche du sous-boîte. UN “soudé” shaft like this requires a bearing system that can handle immense, multi-directional forces.

1. Composant: ‘Tapered roller bearing outer ring’ (306/42-1-1) – Quantité 2
Ce (Comp 1) est le “tasse” ou “outer race” of the bearing. Deux d'entre eux sont utilisés, one for the front bearing and one for the rear. This cup is precision-machined and is pressed *into the bore* of the auxiliary gearbox housing, where it remains stationary.

2. Composant: ‘Tapered roller bearing inner ring’ (306/42-1-2) – Quantité 2
Ce (Comp 2) est le “cône” ou “inner ring” of the bearing, which includes the tapered rollers in their cage. This cone is pressed *onto the journals* (fin) de la Arbre central supérieur gauche du sous-boîte (Comp 4) and spins with it.

Le Logique du rouleau conique is the most important concept for this Arbre central supérieur gauche du sous-boîte. Unlike a simple ball bearing (which handles radial loads well) or a thrust washer (which handles axial loads well), a tapered roller bearing is specifically designed to handle *both* massive radial loads (le “pousser” force provenant de l'engrenage) and massive *axial* loads (le “poussée” force generated by helical-cut gears) *at the same time*.

Le Opposed Mounting Logic is how they work. The two tapered bearings (Comp 1 + Comp 2) are mounted in “opposition” at the front and rear of the Arbre central supérieur gauche du sous-boîte. This creates an extremely rigid assembly that can support the shaft against thrust forces in *both* directions (avant et arrière), ensuring perfect gear mesh alignment under all load conditions.

Le Logique de service is why they are listed as separate inner and outer rings. Ils sont un “matched set” and must be replaced as one. A technician presses the outer rings into the housing and the inner rings onto the Arbre central supérieur gauche du sous-boîte before final assembly.

Cœur 3: Le “Pre-load & Positionnement” Logique (The Shim)

This final component is one of the most critical parts of the entire Arbre central supérieur gauche du sous-boîte assemblée. It is a single washer that ensures the longevity of the expensive bearings and shaft.

1. Composant: ‘Positioning washer’ (1701518-A7G)
Ce (Comp 3) is the ‘Positioning washer’. In a tapered roller bearing application, this is not a simple washer; c'est un “cale” ou “gasket-shim.” Its thickness is precisely controlled, and its function is to set the “bearing pre-load.”

Le Logique de préchargement is a high-precision assembly task. Tapered roller bearings cannot be “lâche” (with end play), nor can they be “too tight.” They require a specific, slight amount of “presser” ou “pré-chargement” to function correctly.

During assembly of the Arbre central supérieur gauche du sous-boîte, a technician installs the components and measures the “terminer la lecture” (the in-and-out movement) avec un indicateur à cadran. They then select a ‘Positioning washer’ (Comp 3) of the *exact* thickness required to eliminate that end play and add the correct, specified pre-load (Par exemple, 0.05mm).

This washer is often placed between a bearing’s outer ring (Comp 1) and the housing or bearing cover. Its thickness is the only thing that guarantees the correct pre-load.

UN Arbre central supérieur gauche du sous-boîte with incorrect pre-load (Par exemple, a shim that is too thick or too thin) will suffer catastrophic bearing failure in a very short time. Too tight, and the bearings will overheat and seize. Too loose, and the shaft will “marcher” axialement, causing the gear teeth to misalign and destroying both the shaft (Comp 4) and the gears it meshes with. Donc, this ‘Positioning washer’ (Comp 3) est un composant critique.

Arbre central supérieur gauche du sous-boîte: Répartition complète en 4 parties

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 4 types de composants dans le Arbre central supérieur gauche du sous-boîte assemblage pour le FAW Jiefang CA3250P66K2L1T1E 6×4 tombereau.

Spécifications de base

Les spécifications pour le Arbre central supérieur gauche du sous-boîte are defined by its role as a high-load, high-precision countershaft for the auxiliary gearbox.