تجميع سقف FAW: ال 33 المكونات المهمة التي تتحكم في التروس الخاصة بك

مرحبًا بك في هذا الدليل الفني المهم حول تجميع سقف FAW (الجزء لا. 1702111بي ايه 9 بي). هذا المكون هو “Top Cover” أو “Shifter Tower” assembly for the main gearbox in the FAW Jiefang CA4251P66K24T1A3E5 6×4 جرار نصف مقطورة ديزل. هذا هو الكامل “منطق” system that translates driver input into gear selection.

ال تجميع سقف FAW is the command center for the manual transmission. It is not part of the vehicle’s cabin, but rather the complex, صالحة للخدمة “top lid” of the transmission housing. It contains all the forks, مهاوي, and interlocks that physically move the synchronizers inside the gearbox. The precision of this تجميع سقف FAW is what ensures a smooth, ينظف, and reliable shift.

This in-depth guide is an essential resource for professional transmission technicians and fleet managers. سنقوم بتفكيك الكل تجميع سقف FAW فيه 33 مكونات صالحة للخدمة, including the main ‘Shift arm’ (1702226AA0L), the ‘Shift shaft’ (1702121بي ايه 9 بي), the ‘Neutral switch’ (3774010-367), and all the critical detent springs and seals.

المكون الأساسي: The ‘Top Cover’ السكن (1702111بي ايه 9 بي)

قلب ال تجميع سقف FAW is the ‘Top cover’ (1702111بي ايه 9 بي). This is the main structural housing, precision-cast from aluminum or iron, that bolts to the top of the main transmission case. هذا المكون هو “هيكل عظمي” for all the other internal control components.

This housing is not just a lid. It is precision-machined with multiple parallel bores that are designed to hold the shift shafts (أو “القضبان”). The alignment of these bores must be perfect, as they ensure the shift forks are held in the exact correct position over the synchronizer sleeves. Any warping or damage to this main housing will make shifting impossible. This core component is the foundation of the تجميع سقف FAW.

This ‘Top cover’ also serves as the main sealing surface. It is sealed to the transmission case by a large gasket (غير مدرجة) to prevent gear oil from leaking out. The ‘Dust cover-top cover’ (1702231EA7G) is a critical rubber boot that seals the point where the main shift arm (1702226AA0L) exits the housing, منع الماء, تراب, and road grime from entering the transmission and contaminating the oil. كامل تجميع سقف FAW is designed as a sealed unit.

ال “منطق” 1: Shift Linkage (Shafts, Arms, and Forks)

ال “منطق” التابع تجميع سقف FAW is how it converts the driver’s “نمط H” shift into the movement of a single, specific shift fork. This begins with the ‘Shift arm’ (1702226AA0L), which is the main lever that the external gear stick connects to. This arm pivots on the ‘Shaft-shift’ (1702121بي ايه 9 بي), a hardened steel shaft.

When the driver moves the stick left or right (selecting a “بوابة,” على سبيل المثال, 1-2 مقابل 3-4), this ‘Shift arm’ moves the ‘Shaft-shift’ to line up with a specific ‘Shift fork head/lug’ (1702226بي ايه 9 بي). When the driver pushes the stick forward or back, the arm then pushes or pulls this specific lug.

This ‘Shift fork head/lug’ is attached to a rail, which in turn is attached to the main shift forks (detailed in Assembly 153). This action slides the fork, engaging the gear. The ‘Sliding bushing-top cover’ (1702168BA9P and 1702214BA9P) units are the low-friction bronze bushings that allow the shift shafts to slide smoothly with minimal effort. This mechanical logic is the “عضلة” التابع تجميع سقف FAW.

ال “منطق” 2: Detent and Interlock System

ال تجميع سقف FAW also contains a critical “حاجز” نظام. This is what gives the shifter its positive “انقر” and prevents the transmission from vibrating out of gear. This system is comprised of springs, plungers, and balls:

• ‘Return spring-high gear’ (1702131B73B)
• ‘Return spring-low gear’ (1702132بي ايه 9 بي)
• 'ربيع’ (1702146-أ6ح)
• "كرة فولاذية."’ (Q967105)
• ‘Spring-reverse pin’ (1702147بي ايه 9 بي)
• 'الغطاس’ (1702146-A8L)

Each shift rail (رمح) has small grooves or “detents” machined into it (one for each gear, and one for neutral). A ‘Plunger’ و"الربيع".’ are aligned with each rail. When a gear is selected, the ‘Steel ball’ or ‘Plunger’ is forced by the spring into one of these grooves. هذا “أقفال” the rail in place, preventing vibration from “popping it out of gear.” ال “انقر” the driver feels is this ball dropping into its groove. These springs are a critical part of the تجميع سقف FAWق “feel.”

هذا تجميع سقف FAW also contains the interlock system, which is a set of pins (like ‘Parallel cut pin’ 1701656-A2K and ‘Post pin’ 1702242-A9P) that physically block the *other* shift rails from moving once one rail has been selected. This is the safety logic that makes it impossible to select two gears at once.

الاستشعار الالكتروني: Neutral Switch (3774010-367)

A key electronic component of the تجميع سقف FAW is the ‘Neutral switch assembly’ (3774010-367). This is a simple but critical sensor. It is a plunger-style switch that is threaded into the ‘Top cover’.

When all the shift rails are in their “حيادي” موضع, a groove aligns under this switch, allowing its plunger to drop, which closes an electrical circuit. This sends a “Neutral” signal to the truck’s main ECU. This signal is essential for:

• **Safety Start:** It is part of a safety interlock that prevents the engine from being started “in gear.”
• **Idle Control:** It tells the ECU that the engine is not under load, allowing it to enter its “idle” map for fuel efficiency.
• **PTO Logic:** It is often used as a prerequisite for engaging a Power Take-Off (مأخذ الطاقة).

A failure of this single switch on the تجميع سقف FAW can lead to a “لا بداية” condition that can be very difficult to diagnose.

الأختام, Vents, والسحابات

ال تجميع سقف FAW must be perfectly sealed from the elements but also able to “breathe.” The ‘Breather plug assembly’ (1702165-A8L) is a one-way “كاب” that allows internal pressure (which builds as the gear oil heats up) to vent *out*, but prevents water and dust from getting *in*.

The ‘Oil seal assembly’ (1702235-A7G) is a critical radial seal that is installed on the main ‘Shaft-shift’ (1702121بي ايه 9 بي). It prevents the gear oil inside the تجميع سقف FAW from leaking out where the shift shaft enters.

كامل تجميع سقف FAW is held together and mounted with a large number of high-grade fasteners. This includes ‘Hex cap bolts’ (CQ1501040), 'مسامير شفة سداسية’ (Q1840825), ‘Hex screw plugs’ (1702148-أ6ح, 1702149-A8L), "حشيات الربيع."’ (س40310), and ‘Elastic retaining rings’ (س43322, Q43226, س43034, س43230) to secure all the pins and shafts.

تجميع سقف FAW (غطاء أعلى النقل) قائمة الأجزاء

الجدول التالي يوفر كامل, تفصيل مفصل للجميع 33 components identified in the ‘Top Cover Assembly’ (referred to as the تجميع سقف FAW) رسم تخطيطي للجرار FAW CA4251P66K24T1A3E5.

المواصفات الفنية وسياق التجميع

المواصفات ل تجميع سقف FAW يتم تعريفها من خلال وظيفتها كناقل حركة ميكانيكي “منطق” سبورة. هذا تجميع سقف FAW (Top Cover) is responsible for all gear selection.