Задний воздухозаборник FAW: Загадка давления в кабине, состоящая из трех частей & Комфорт решен

Welcome to this critical technical breakdown of the Задний воздухозаборник FAW сборка (Артикул: 5610010-А86-С00). This is one of the most clever, yet overlooked, “логика” components on the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. Its primary function is not for climate control; это критично “выравнивание давления” система.

The “логика” принадлежащий Задний воздухозаборник FAW is to act as a one-way “exhauster” valve for the sealed cab. Этот сингл, simple component is solely responsible for making the doors easy to close. It also ensures a constant, fresh air exchange from the HVAC system, и (наиболее критично) it creates a “one-way” seal that prevents hazardous exhaust fumes and road dust from being *sucked* into the cab.

This in-depth guide is essential for cab technicians, body shops, и специалисты по запчастям. The Задний воздухозаборник FAW assembly is a simple 3-part system. We will deconstruct this system, analyzing the ‘Rear air vent assy’ (МГУ 1) as the primary “логика” компонент, and the two-piece, vibration-isolating fastener system (МГУ 2 & 3) that provides its unique mounting “логика.”

МГУ 1: The “Односторонний клапан” Logic of the Vent (5610010-А86-С00) (The “дольше” Модуль)

The ‘Rear air vent assy’ (5610010-А86-С00) is the primary MSU of the Задний воздухозаборник FAW система. Этот компонент представляет собой “черный ящик” that is not designed to be repaired, only replaced. It is a louvered, rectangular vent, typically hidden from view on the rear bulkhead of the cab, often behind an interior trim panel or under the sleeper bunk.

Его “логика” is to act as a one-way valve, and it performs three critical functions for the cab.

1. The “Door Slam” Логика (Pressure Release):

This is the component’s most important “логика” for the driver. A modern truck cab is a nearly-airtight, sealed box. When a driver goes to close the heavy, well-sealed door, they are trying to compress all the air inside that box. This creates an “air pillow” of high pressure that *pushes back* against the door, making it extremely hard to latch without slamming it.

The Задний воздухозаборник FAW assembly contains several lightweight, flexible rubber flaps. Когда дверь закрыта, the sudden spike in cab pressure *pushes* these flaps open, allowing a large volume of air to escape instantly. Этот “exhale” logic releases the air pillow, allowing the door to close smoothly and latch with minimal effort.

2. The “Fresh Air” Логика (HVAC Exhaust):

The cab’s HVAC (Обогрев, Вентиляция, и кондиционер) system is a “positive pressure” система. Its fans are constantly blowing fresh (or recirculated) air *into* the sealed cab. Этот “old” воздух, along with driver’s breath (CO2), must have a way to get *out*.

The Задний воздухозаборник FAW acts as the HVAC system’s dedicated exhaust port. The slight positive pressure from the fan is enough to gently push the rubber flaps open, allowing stale, humid, and CO2-filled air to be silently exhausted from the cab. Этот “логика” of constant air exchange is critical for keeping the driver alert and preventing the windows from fogging up.

3. The “Anti-Fume” Логика (One-Way Sealing):

Это “логика” of the rubber flaps themselves. They are *one-way* valves. They only open from the *inside-out*.

When the truck is at highway speed, the aerodynamics of the cab create a powerful “slipstream” или “vacuum” zone directly behind the rear bulkhead. This low-pressure area would *suck* air *into* the cab through any available opening.

This suction pulls the flaps of the Задний воздухозаборник FAW *tightly shut*, creating a perfect seal. Этот “логика” is a critical safety feature. It prevents the vacuum from pulling in road dust, water spray, и (most dangerously) carcinogenic diesel exhaust fumes that can be trapped in the “грязный” air behind the cab.

Режимы отказа & Serviceability of the Vent (МГУ 1)

The ‘Rear air vent assy’ is a single MSU. It is not designed to be repaired, only replaced. As a mechanical component, it is prone to failure over the life of the Задний воздухозаборник FAW сборка.

Режим отказа 1: Clogging. Это самая распространенная поломка. The vent, often located low on the cab wall, can become clogged with dust, insulation fibers, или мусор (НАПРИМЕР., paper, листья).

• Symptom: The doors are suddenly very difficult to close.
• Диагностика: The technician inspects the Задний воздухозаборник FAW (МГУ 1) and finds the flaps are blocked.

Режим отказа 2: Flap Failure (Cracked or Stuck). The EPDM rubber flaps can become brittle and crack with age, or get “липкий” and stick shut.

• Symptom (Stuck Shut): Doors are hard to close, windows fog up.
• Symptom (Stuck Open/Cracked): Громкий “шум ветра” или “свист” from the rear of the cab at highway speeds. The driver may also report the smell of exhaust fumes in the cab.

In all these cases, the service “логика” это просто: the technician replaces the single ‘Rear air vent assy’ МГУ.

МГУ 2 & 3: The “Plastic-on-Plastic” Anti-Vibration Logic

Это “installation logic” для Задний воздухозаборник FAW, and it is a clever piece of NVH engineering. The system uses one screw and one special nut.

МГУ 2: ‘Cross recessed pan head self-tapping screw’ (CQ2714816F6) – Кол-во 1

This single screw is the fastener. Его “саморез” logic means it is designed to cut its own threads as it is driven in.

МГУ 3: ‘Ventilated embedded plastic nut’ (Q39805) – Кол-во 1

This is the key component. Этот “embedded plastic nut” (или “snap-in” орех) это “логика” ассамблеи. This MSU is pushed into the *metal* hole in the cab’s bulkhead *first*. It snaps into place.

The “Логика изоляции”: The ‘Rear air vent assy’ (МГУ 1) is then placed, and the ‘Self-tapping screw’ (МГУ 2) is driven *through* the plastic vent flange and *into* the ‘Plastic nut’ (МГУ 3).

This creates a **plastic-on-plastic** connection. Весь Задний воздухозаборник FAW assembly *never* makes hard contact with the cab’s metal body. Этот “логика” of isolation is 100% for NVH. It prevents the vibrating metal wall of the cab from transferring its energy to the plastic vent, which would cause a “гул” или “греметь” inside the cab.

These fasteners are critical MSUs. If a technician breaks this one-time-use plastic nut, it *must* be replaced with an OEM part. Using a standard metal nut would defeat the anti-rattle “логика” of the entire system.

FAW Rear Air Vent Parts List & Технические характеристики

В следующей таблице представлена ​​полная, подробная разбивка всех 3 типы компонентов, указанные в Задний воздухозаборник FAW в сборе для трактора FAW CA4251P66K24T1A3E5.

Технические характеристики

Технические характеристики Задний воздухозаборник FAW are defined by its “triple-logic” function as a pressure-release, HVAC exhauster, and one-way fume barrier for the cab.