Composants de contrôle interne de FAW: À l'intérieur du 32 Pièces critiques qui modifient votre transmission

Bienvenue dans ce guide technique critique sur le Composants de contrôle interne de FAW, le complet “shift logic” assembly for the manual transmission in the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel. Ce système est le “cerveau” that translates the driver’s hand movement into mechanical gear selection.

Le Composants de contrôle interne de FAW are not the gears themselves, mais l'ensemble “top-cover” assembly of forks, rails, and interlocks that physically move the synchronizer sleeves. When the driver moves the gear stick, they are moving this assembly, which in turn selects the desired gear.

This in-depth guide is an essential resource for professional transmission technicians. Nous déconstruirons l'ensemble Composants de contrôle interne de FAW système dans son 32 serviceable parts, including the shift forks for every gear, the shift rails (arbres) they ride on, and the critical interlock and detent mechanisms that ensure safe, precise shifting.

Composants de base: The Shift Fork System

Le “muscle” de la Composants de contrôle interne de FAW is the set of shift forks. Ce sont des robustes, acier forgé “jougs” that ride in the grooves of the synchronizer sliding sleeves (as detailed in assembly 145). This parts list details the complete set:

• ‘Fork-1st, 2nd gear’ (1702031-A9P)
• ‘Fork-3rd, 4th gear’ (1702041-A9P & 1702048-A9P)
• ‘Fork-5th, 6th gear’ (1702051-A9P, 1702053-A9P, 1702052-A9P)
• ‘Fork-reverse gear’ (1702067-A9P)

When the driver selects a gear, the gear lever (via the ‘Shaft-shift mechanism’ 1702078-A1K) selects one of these forks. The ‘Shaft-shift fork support’ (1702073-A9P) then slides this fork “avant” ou “backward.” This fork, à son tour, slides the synchronizer sleeve, which engages the gear. The ‘Fork-reverse gear’, Par exemple, is responsible for moving the reverse idler gear into its mesh position.

Le “coussinets” ou “dents” of these forks are the primary wear item. They are in constant contact with the spinning synchronizer sleeve. Over millions of shifts, ces coussinets peuvent s'user. Worn shift forks are a primary cause of a “négligent” manette de vitesse, grinding gears, or the transmission “sortir” of gear under load. These forks are the most critical moving parts of the Composants de contrôle interne de FAW.

Le “Logique”: Interlock System (1702081-A9P)

The most important “logique” de la Composants de contrôle interne de FAW is the **interlock system**. It is a critical safety mechanism that makes it physically impossible to select two different gears at the same time (which would instantly lock and destroy the transmission).

Ce “porte logique” is created by a clever mechanical system of plates, balls, and pins:

• ‘Interlock plate’ (1702081-A9P, 1702082-A9P, 1702083-A9P, 1702089-A9P)
• ‘Steel ball’ (Q967165) – 4 unités
• ‘Bushing-interlock plate’ (1702084-A9P)

This is how it works: The shift shafts (rails) run parallel to each other. Between them are channels containing the ‘Steel balls’. When all shafts are in neutral, the balls can move freely. Cependant, as soon as one shift shaft (Par exemple, the 1st/2nd gear shaft) est déplacé, its ‘Interlock plate’ pushes one of the ‘Steel balls’ *sideways* into a groove on the *other* shift shafts (Par exemple, the 3rd/4th shaft). Ce “rogue” ball, now out of its channel, physically blocks the other shafts from moving.

This ensures that only one shift shaft, and therefore only one shift fork, can be moved out of its neutral position at any given time. C'est simple, robust mechanical “logique” is a core feature of the Composants de contrôle interne de FAW. A worn ‘Interlock plate’ or a missing ‘Steel ball’ is a critical failure that could allow a double-gear engagement.

Le “Detent” Système (Autobloquant)

Le “détente” system provides the “sentir” of the gear shift and prevents the transmission from vibrating out of gear. Cette partie du Composants de contrôle interne de FAW is comprised of the ‘Cover-self-locking mechanism’ (1702227-A9P), its ‘Gasket’ (1702228-A9P), and the four ‘Self-locking spring’ (1702061AA4P) unités.

Each shift shaft has three “détente” grooves machined into it: one for Neutral, one for the “avant” engrenage (Par exemple, 3rd), and one for the “en arrière” engrenage (Par exemple, 4ème). The ‘Self-locking spring’ pushes a small steel ball or “plunger” (often part of the 1702061AA4P assembly) into this groove.

When the driver shifts, they must apply enough force to overcome this spring, causing the ball to “sortir” of the neutral groove and “pop into” the 3rd gear groove. C'est ce qui crée le “cliquez” ou “je pense” that confirms the gear is fully engaged. It also serves as a critical locking mechanism, as the spring’s force holds the shaft in place, preventing engine vibration from “marche” the fork and causing the transmission to pop out of gear. A weak or broken ‘Self-locking spring’ is the primary cause of a transmission that will not stay in gear. This detent system is a key “logique” de la Composants de contrôle interne de FAW.

Limiters and Electronic Switches

Le Composants de contrôle interne de FAW also include physical “s'arrête” and electronic “sensors.” The ‘Limit stop block-shift rail’ (1702092-A9P) and ‘Limit stop block-reverse gear’ (1702068-A9P) are the final “hard stops” that prevent the shift forks from over-traveling. They are secured with ‘Flat head dowel pin’ (1702097-A9P) unités.

The most important electronic part is the ‘Stop light switch assembly’ (3729100-71UN). This is the **reverse light switch**. It is a simple plunger-style switch. When the driver moves the ‘Fork-reverse gear’ (1702067-A9P), the shift shaft presses this plunger, which completes an electrical circuit, turning on the truck’s white reverse lights and sounding the backup alarm. This switch is a critical safety component of the Composants de contrôle interne de FAW.

Enfin, the ‘Shaft-shift rocker arm’ (1702074-A9P) et son « Support’ (1702072-A9K) form the pivot that transfers the driver’s shift-lever motion to the main shift shafts. L'ensemble Composants de contrôle interne de FAW assembly is a complex mechanical computer.

FAW Internal Control Components Parts List

Le tableau suivant fournit l'intégralité, ventilation détaillée de tous 32 components identified in the ‘Internal Control Components’ (Shifter Assembly) schéma du tracteur FAW CA4251P66K24T1A3E5. Ce Composants de contrôle interne de FAW le système est le “logique” de la boîte de vitesses.

Spécifications techniques et contexte d'assemblage

Les spécifications pour le Composants de contrôle interne de FAW are defined by its function as the transmission’s mechanical “logique” board. Ce Composants de contrôle interne de FAW system is responsible for all gear selection.