Brake shoe working principle
| Structure Type | Braking Force Characteristics | Application Scenarios | Remarks |
|---|---|---|---|
| Leading-trailing shoe | Stable braking force, no self-energizing effect, lowest cost | Rear axle of medium/heavy trucks, trailers | Asymmetric braking, suitable for conventional freight transport |
| Dual-leading shoe | Braking force 50% higher than leading-trailing shoe, strong self-energizing effect | Front axle of light trucks, high-speed commercial vehicles | Braking efficiency decreases in reverse |
| Duo-servo self-energizing | Self-energizing in both forward and reverse directions, maximum braking torque | Heavy trucks, mining vehicles, long downhill conditions | Complex structure, difficult maintenance and adjustment |
3. By Vehicle Model Adaptation (Core Specifications)
| Vehicle Category | Brake Drum Diameter | Shoe Width | Core Features |
|---|---|---|---|
| Light truck | Φ280–Φ320 mm | 40–60 mm | Lightweight design, suitable for blue-plate trucks |
| Medium/heavy truck | Φ380–Φ420 mm | 80–120 mm | Thickened shoe, compatible with dual wheel cylinders |
| Bus/coach | Φ350–Φ400 mm | 70–90 mm | Smooth braking, low noise |
| Trailer | Φ400–Φ420 mm | 100–120 mm | High wear resistance, suitable for continuous braking |
II. Heavy-duty Reinforced Structural Design
Unlike the lightweight design of passenger vehicles, truck brake shoes are specially reinforced structurally for heavy-duty applications. The key component parameters are as follows:
| Component | Heavy-duty Design Points | Core Functions |
|---|---|---|
| Metal brake shoe | High-carbon steel with reinforcing ribs, thickness ≥6 mm, laser quenching | Resists deformation and fracture, transmits ultra-high braking torque |
| Friction lining | Thickness 15–18 mm (only 8–12 mm for passenger vehicles), mainly riveted | Extends service life, prevents detachment under heavy loads |
| Support pin / anchor pin | Enlarged diameter, galvanized / phosphated surface | Resists corrosion and seizure, suitable for high salt spray / heavy-duty conditions |
| Return spring | High-temperature resistant alloy material, stronger elasticity | Ensures rapid return after braking, avoids drag wear |
