Блок тормозной логики FAW Zhongqiao: Критический анализ 23 “Модель АБС” Компоненты

Welcome to this critical technical analysis of the Блок тормозной логики FAW Zhongqiao (Сборка 549). Это полный, S-Cam, “Модель АБС” drum brake assembly for the “Zhongqiao” or *centre* (вперед) drive axle of the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. This assembly is a primary “service brake” responsible for providing a large portion of the vehicle’s stopping power.

The Блок тормозной логики FAW Zhongqiao is a heavy-duty pneumatic “логика” система. Its function is to convert high-pressure air from the ‘Spring brake chamber’ (3530015-98Р-С00) into immense mechanical stopping force. This is achieved through the rotational logic of the ‘S-Cam’ (3502015-98р) and the ‘Rear slack adjuster assembly’ (3501205DCA1Q).

This in-depth guide is an essential resource for professional brake technicians and fleet managers. Мы разберем всю Блок тормозной логики FAW Zhongqiao систему в свою 23 исправные компоненты, including the S-cams, slack adjusters, brake shoes, support brackets, and the critical springs and rollers that ensure fail-safe operation. Understanding this Блок тормозной логики FAW Zhongqiao is paramount for vehicle safety.

Основной “Логика” 1: The S-Cam Actuation System

Сердце Блок тормозной логики FAW Zhongqiao‘s actuation “логика” это “S-Cam.” This assembly includes the ‘Rear left cam’ (3502015-98р) and ‘Rear right cam’ (3502020-98р). This is a simple, robust, and incredibly powerful mechanism.

This component is a solid, S-shaped, кованая сталь “камера” that is part of a shaft. This shaft passes through the ‘Rear brake support’ (3502026-98р) and is supported by ‘Bushing-cam shaft’ (3502409-98р). On the outside of the Блок тормозной логики FAW Zhongqiao, this shaft is splined to the ‘Slack adjuster assembly’ (3501205DCA1Q).

Here is the “логика” принадлежащий Блок тормозной логики FAW Zhongqiao in action:

1. The driver presses the brake pedal, sending air to the ‘Spring brake chamber’ (3530015-98Р-С00).
2. The air chamber pushes a rod, which rotates the ‘Slack adjuster’.
3. The ‘Slack adjuster’ rotates the S-cam shaft.
4. The “С” profile of the cam rotates between the two ‘Brake shoe rollers’ (нет в списке, but part of shoe assy).
5. Как “high spot” принадлежащий “С” rotates, it acts as a wedge, forcing the two ‘Rear brake shoe friction plate assembly’ (3502375-98р) units apart with immense mechanical advantage.
6. This forces the ‘Brake lining’ (3502407-98р) into the ‘Rear brake drum’ (see Assembly 528), creating the friction that stops the truck.

When the driver releases the pedal, air is vented, and the ‘Return springs’ (3502436-98р, 3502392-98р) snap the shoes back together, forcing the S-cam to rotate back to its “дом” позиция. This simple, powerful logic is the standard for heavy-duty air brakes. The Блок тормозной логики FAW Zhongqiao relies on this S-cam design for its stopping power.

Основной “Логика” 2: The Self-Adjusting System (3501205DCA1Q)

The most important safety “логика” принадлежащий Блок тормозной логики FAW Zhongqiao is its “self-adjusting” capability. This is the function of the ‘Block assembly’ (3501205DCA1Q), which is the self-adjusting slack adjuster.

As the ‘Brake lining’ (friction material) wears down, а “gap” between the shoe and the drum increases. This means the S-cam must rotate further and further to make contact. Этот “слабый” results in a long, “губчатый” pedal travel and dangerously slow brake application.

This ‘Block assembly’ (slack adjuster) это решение. It is an “intelligent” рычаг. It contains an internal one-way clutch mechanism. During normal braking, it acts as a solid lever. Однако, if the travel (а “слабый”) becomes too great, the internal mechanism “clicks” one notch on its return stroke. Этот “click” slightly rotates the resting position of the S-cam shaft, permanently “adjusting” а “дом” position of the brake shoes to be closer to the drum.

Этот “self-adjusting” logic is a critical safety feature that ensures the Блок тормозной логики FAW Zhongqiao is always in perfect adjustment, providing a firm pedal and immediate stopping power. A failed slack adjuster (one that is seized or has a broken spring) is a critical fault that will cause the brakes on that wheel to either drag (if stuck “на”) or not apply (if stuck “off”). This component is a key part of the Блок тормозной логики FAW Zhongqiao система.

The Foundation: Кронштейны, Shoes, and Springs

Весь Блок тормозной логики FAW Zhongqiao must be mounted to the non-rotating centre axle housing (see Assembly 400). Этот “foundation” is provided by the ‘Rear brake support’ (3502026-98р). This heavy-duty steel “spider” bracket is the anchor for the entire system, secured to the axle flange by ‘Hex flange bolts’ (Q1841040T).

The ‘Rear left (up/down) brake shoe friction plate assembly’ (3502375-98р, 3502380-98р) are the main friction components. These are the steel “shoes” (‘Rear brake shoe web’ – 3502398-98р) that hold the ‘Brake lining’ (3502407-98р). These linings are attached with 128 ‘Brake lining plate rivets’ (3502408-А0Е). The shoes themselves pivot on the ‘Rear brake shoe shaft’ (3502086-98р).

The “отказоустойчивый” logic of the Блок тормозной логики FAW Zhongqiao is provided by the springs. The ‘Return spring’ (3502436-98р) is a high-tension spring that is constantly *pulling* the brake shoes *away* from the drum. The ‘Return spring hook pin’ (3502392-98р) and ‘Cotter pins’ (Q43690) hold it in place. The instant the driver releases the brake pedal, this spring snaps the shoes back, immediately releasing the brake. A broken or weak return spring is a dangerous fault that will cause the Блок тормозной логики FAW Zhongqiao к “drag,” leading to overheating, brake fade, and potential fire.

The “Мышцы”: ‘Spring Brake Chamber’ (3530015-98Р-С00)

The “мышца” принадлежащий Блок тормозной логики FAW Zhongqiao is the ‘Rear left/right spring brake chamber quick connector assembly’ (3530015-98Р-С00, 3530020-98Р-С00). This is a “spring brake” или “maxi-brake” chamber, which is a key “логика” and safety component.

This chamber is actually *two* chambers in one:

1. **Service Brake:** The “передний” half is a standard air chamber. Когда водитель нажимает на педаль, air enters this chamber, pushing a rod to apply the Блок тормозной логики FAW Zhongqiao (as described with the S-Cam).
2. **Parking/Emergency Brake:** The “back” half contains a massive, powerful spring that is *always* trying to push the rod and apply the brake. The *only* thing that releases it is high-pressure air (80+ пси).

Это “отказоустойчивый” логика. To drive the truck, the driver must “charge” the system, sending air to this rear chamber to “клетка” or compress the powerful spring, *releasing* the parking brake. If the truck ever loses all air pressure (НАПРИМЕР., from a burst FAW Brake Line or compressor failure), this spring is automatically released, mechanically applying the Блок тормозной логики FAW Zhongqiao and stopping the truck. The ‘Support’ (3501033-242) and ‘Dust cover-brake shoe’ (3502031-98р) help protect these vital components.

FAW Zhongqiao Brake Logic Assembly Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 23 components identified in the ‘Zhongqiao Brake Logic Assembly (Модель, АБС)’ (549) схема трактора FAW CA4251P66K24T1A3E5.

Технические характеристики и контекст сборки

Технические характеристики Блок тормозной логики FAW Zhongqiao are defined by its function as a heavy-duty, S-Cam, self-adjusting air brake. The Блок тормозной логики FAW Zhongqiao is a primary safety system for the centre drive axle.