مجموعة منطق فرامل المحور الخلفي FAW: انهيار حاسم ل 23 مكونات السلامة

مرحبًا بك في هذا الدليل الفني المهم حول مجموعة منطق فرامل المحور الخلفي FAW (حَشد 547). هذا هو الكامل, S-Cam, “self-adjusting” drum brake assembly for the *rear-most* drive axle of the FAW Jiefang CA4251P66K24T1A3E5 6×4 جرار نصف مقطورة ديزل. This assembly is the primary “service brake” responsible for providing the majority of the vehicle’s stopping power.

ال مجموعة منطق فرامل المحور الخلفي FAW is a heavy-duty pneumatic “منطق” نظام. Its function is to convert high-pressure air from the ‘Spring brake chamber’ (3530015-98R-C00) into immense mechanical stopping force. This is achieved through the rotational logic of the ‘S-Cam’ and the ‘Rear slack adjuster assembly’ (3501205DCA1Q).

This in-depth guide is an essential resource for professional brake technicians and fleet managers. سنقوم بتفكيك الكل مجموعة منطق فرامل المحور الخلفي FAW فيه 23 مكونات صالحة للخدمة, including the S-cams, slack adjusters, brake shoes, support brackets, and the critical springs and rollers that ensure fail-safe operation. Understanding this مجموعة منطق فرامل المحور الخلفي FAW is paramount for vehicle safety.

جوهر “منطق” 1: The S-Cam Actuation System

قلب ال مجموعة منطق فرامل المحور الخلفي FAW‘s actuation “منطق” هو “S-Cam.” This assembly includes the ‘Rear left cam’ (3502015-98ر) and ‘Rear right cam’ (3502020-98ر). This is a simple, robust, and incredibly powerful mechanism.

This component is a solid, S-shaped, forged steel “cam” that is part of a shaft. This shaft passes through the ‘Rear brake support’ (3502026-98ر) and is supported by ‘Bushing-cam shaft’ (3502409-98ر). On the outside of the مجموعة منطق فرامل المحور الخلفي FAW, this shaft is splined to the ‘Slack adjuster assembly’ (3501205DCA1Q).

Here is the “منطق” التابع مجموعة منطق فرامل المحور الخلفي FAW in action:

1. The driver presses the brake pedal, sending air to the ‘Spring brake chamber’ (3530015-98R-C00).
2. The air chamber pushes a rod, which rotates the ‘Slack adjuster’.
3. The ‘Slack adjuster’ rotates the S-cam shaft.
4. ال “ق” profile of the cam rotates between the two ‘Brake shoe rollers’ (3502394BA2T).
5. As the “high spot” التابع “ق” rotates, it acts as a wedge, forcing the two ‘Rear brake shoe friction plate assembly’ (3502375-98ر) units apart with immense mechanical advantage.
6. This forces the ‘Brake lining’ (3502407-98ر) into the ‘Rear brake drum’ (see Assembly 524/525), creating the friction that stops the truck.

When the driver releases the pedal, air is vented, and the ‘Return springs’ (3501436CA1Q, 3502392-98ر) snap the shoes back together, forcing the S-cam to rotate back to its “بيت” موضع. هذا بسيط, powerful logic is the standard for heavy-duty air brakes. ال مجموعة منطق فرامل المحور الخلفي FAW relies on this S-cam design for its stopping power.

جوهر “منطق” 2: The Self-Adjusting System (3501205DCA1Q)

The most important safety “منطق” التابع مجموعة منطق فرامل المحور الخلفي FAW هو “self-adjusting” capability, as noted in the diagram title. This is the function of the ‘Rear slack adjuster assembly’ (3501205DCA1Q).

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

This ‘Slack adjuster’ assembly is the solution. إنه “intelligent” lever. It contains an internal one-way clutch mechanism. During normal braking, it acts as a solid lever. لكن, if the travel (ال “slack”) becomes too great, the internal mechanism “النقرات” one notch on its return stroke. هذا “انقر” slightly rotates the resting position of the S-cam shaft, permanently “adjusting” ال “بيت” position of the brake shoes to be closer to the drum.

هذا “self-adjusting” logic is a critical safety feature that ensures the مجموعة منطق فرامل المحور الخلفي FAW 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 “على”) or not apply (if stuck “عن”). This component is a key part of the مجموعة منطق فرامل المحور الخلفي FAW نظام.

The Foundation: بين قوسين, Shoes, and Springs

كامل مجموعة منطق فرامل المحور الخلفي FAW must be mounted to the non-rotating axle housing (see Assembly 328/400). هذا “foundation” is provided by the ‘Rear brake support’ (3502026-98ر). 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’ (3502375-98ر, 3502380-98ر) are the main friction components. These are the steel “shoes” that hold the ‘Brake lining’ (3502407-98ر). These linings are attached with ‘Brake lining plate rivets’ (3502408-A0E). The shoes themselves pivot on the ‘Brake shoe shaft’ (3502086-98ر) and ‘Brake shoe shaft bushing’ (3502409-98ر).

ال “fail-safe” منطق مجموعة منطق فرامل المحور الخلفي FAW is provided by the springs. The ‘Return spring’ (3501436CA1Q) is a high-tension spring that is constantly *pulling* the brake shoes *away* from the drum. The ‘Return spring hook pin’ (3502392-98ر) 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 مجموعة منطق فرامل المحور الخلفي FAW ل “drag,” leading to overheating, brake fade, and potential fire.

ال “Muscle”: ‘Spring Brake Chamber’ (3530015-98R-C00)

ال “عضلة” التابع مجموعة منطق فرامل المحور الخلفي FAW is the ‘Rear left/right spring brake chamber assembly’ (3530015-98R-C00, 3530020-98R-C00). هذا هو “spring brake” أو “maxi-brake” chamber, which is a key “منطق” and safety component.

This chamber is actually *two* chambers in one:

1. **Service Brake:** ال “أمام” half is a standard air chamber. When the driver presses the pedal, air enters this chamber, pushing a rod to apply the مجموعة منطق فرامل المحور الخلفي FAW.
2. **Parking/Emergency Brake:** ال “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+ رطل لكل بوصة مربعة).

هذا هو “fail-safe” منطق. To drive the truck, the driver must “charge” the system, sending air to this rear chamber to “cage” or compress the powerful spring, *releasing* the parking brake. If the truck ever loses all air pressure (على سبيل المثال, from a burst خط الفرامل فاو or compressor failure), this spring is automatically released, mechanically applying the مجموعة منطق فرامل المحور الخلفي FAW and stopping the truck. The ‘Support’ (3501033-242) and ‘Dust cover-brake shoe’ (3502031-98ر) help protect these vital components.

FAW Rear Axle Brake Logic Assembly Parts List (1/2)

يعرض الجدول التالي الجزء الأول من التقسيم التفصيلي لـ مجموعة منطق فرامل المحور الخلفي FAW (547) رسم تخطيطي للجرار FAW CA4251P66K24T1A3E5.

FAW Rear Axle Brake Logic Assembly Parts List (2/2)

يوضح هذا الجدول المكونات المتبقية لل مجموعة منطق فرامل المحور الخلفي FAW (547) رسم بياني.

المواصفات الفنية وسياق التجميع

المواصفات ل مجموعة منطق فرامل المحور الخلفي FAW are defined by its function as a heavy-duty, S-Cam, self-adjusting air brake. ال مجموعة منطق فرامل المحور الخلفي FAW is a primary safety system.