Product Description
Our pneumatic fail-safe brakes are spring-applied, air-released safety units engineered to provide rapid-response emergency stopping and zero-slip holding torque for automated production lines, heavy winding spool shafts, printing presses, and industrial conveyor drives.
Pneumatic Actuation & Core Safety Engineering
Instant Fail-Safe Engagement: Utilizes high-force internal disc springs that instantly clamp the friction brake tracks the moment air pressure drops or a power outage disrupts the pneumatic solenoid supply.
Low-Friction Quad-Seal Technology: The internal piston chamber features premium nitrile or fluororubber (Viton) multi-lip seals, maintaining absolute pressure holding with an ultra-low breakaway pressure requirement of less than 1.5 bar.
Rapid Exhaust Optimization: Designed with low internal air volume clearance and oversized intake/exhaust ports to maximize airflow speed, achieving emergency locking response times of under 50 milliseconds.
Dry, Maintenance-Free Operation: Internal slide tracks feature permanent solid-graphite lubricants, allowing the brake cylinder to perform flawlessly for millions of strokes without requiring inline oil lubrication.
Structural Alignment & Machining Tolerances
| Component Stage | Control Method & Quality Metric |
| Cylinder Body | Hard-anodized high-tensile aluminum alloy or ductile iron with a mirror-honed inner bore. |
| Piston Shaft | Precision-ground steel with a hard chrome-plated surface layer to resist corrosion and scuffing. |
| Spring Stack | Multi-layer Belleville disc springs sorted via automated load-cell sorting to ensure exact force balances. |
| Shoe Retainer | Integrated floating caliper layout that automatically accommodates minor shaft runout up to 0.2mm. |
| Fastener Quality | Grade 12.9 high-tensile alloy steel structural fasteners torqued to strict engineering metrics. |
Dynamic Performance Verification
Every pneumatic unit undergoes multi-point pressure and structural performance logging before packing. Factory Test Reports (FTR) verify the following data arrays:
Pressure Leakage Hold: Static pressure tests at maximum rating (typically 6 to 7 bar) to confirm zero drop over 30 minutes.
Millisecond Response Logging: Digital sensor tracking to measure the precise speed from air exhaust to 100% torque engagement.
Spring Fatigue Stroke: Rapid cycle test blocks to verify spring return stability and lockup consistency.
Smart Upgrades & Configuration Matrix
| Category | Available Engineering Options |
| Valve Integration | Direct-mounted quick exhaust valves (QEV) to further compress emergency braking response times. |
| Telemetry Sensors | Inductive proximity sensors to monitor "Brake Released" or "Lining Worn" positions for PLC inputs. |
| Corrosion Shielding | Stainless steel 316 internal components for harsh food-processing or offshore marine use. |
| Manual Release | Integrated mechanical bolt overrides allowing manual brake release during factory setup or zero-air maintenance. |
| Friction Matrix | High-energy semi-metallic linings for high-speed indexing / Organic quiet linings for textile machinery. |
Model Designation
External dimensions
Outline dimensions table
| Product model | A | a1 | a2 | a3 | b1 | b2 | B | C | d | n | K | P | L | E | W | H |
| SB(YQP)50 | 77 | 77 | 90 | 38 | 38 | 38 | 154 | 150 | 20.5 | 8 | 56 | 102 | 300 | 240 | 110 | 299 |
| SB(YOP)100 | 95 | 95 | 105 | 45 | 55 | 45 | 190 | 180 | 25 | 8 | 71 | 102 | 348 | 286 | 140 | 345 |
| SB(YQP)160 | 110 | 120 | 135 | 65 | 70 | 65 | 260 | 235 | 31 | 8 | 87 | 106 | 412 | 370 | 170 | 398 |
| SB(YQP)250 | 130 | 120 | 160 | 75 | 80 | 75 | 300 | 275 | 37 | 8 | 87 | 106 | 456 | 370 | 170 | 459 |
| SB(YQP)315 | 140 | 175 | 205 | 85 | 90 | 82.5 | 335 | 330 | 37 | 8 | 137 | 106 | 476 | 410 | 270 | 500 |
| SB(YQP)400 | 170 | 180 | 220 | 120 | 110 | 110 | 440 | 420 | 50 | 8 | 137 | 142 | 602 | 546 | 270 | 549 |
Brake Disc-Related Dimensions
| Product model | b | D | d1 | d2Max | ||
| SB(YQP)50 | 30 | 36 | 40 | ≥500 | D-120 | D-300 |
| SB(YQP)100 | 30 | 36 | 40 | ≥500 | D-150 | D-380 |
| SB(YQP)160 | 30 | 36 | 40 | ≥600 | D-180 | D-440 |
| SB(YQP)250 | 30 | 36 | 40 | ≥600 | D-180 | D-480 |
| SB(YQP)315 | 30 | 36 | 40 | ≥1200 | D-280 | D-600 |
| SB(YQP)400 | 30 | 36 | 40 | ≥1800 | D-280 | D-660 |
Technical data
| Product model | Clamping force (KN) | release pressure(Mpa) | Open valve oil volume (ML) | Retreat distance(mm) | Friction coefficient (μ) | Installation bolts/strength values/torque(N.m) | Weight (excluding bracket)(Kg) |
| SB(YQP)50 | 50 | 11 | 15 | 2 | 0.4 | 8-M20,12.9,750 | 90 |
| SB(YQP)100 | 100 | 12 | 50 | 2 | 0.4 | 8-M24,12.9,1000 | 150 |
| SB(YQP)160 | 160 | 12 | 70 | 2 | 0.4 | 8-M30,12.9,1500 | 310 |
| SB(YQP)250 | 250 | 13 | 95 | 2 | 0.4 | 8-M36,12.9,2500 | 552 |
| SB(YQP)315 | 315 | 14 | 115 | 2 | 0.4 | 8-M36,12.9,3540 | 672 |
| SB(YQP)400 | 400 | 12 | 170 | 2 | 0.4 | 8-M48,12.9,4000 | 1100 |
Operational Longevity & Site Practice
Air Supply Quality: Ensure incoming compressed air runs through a standard 5-micron filter and moisture separator to prevent internal cylinder condensation.
Seal Check: Periodically inspect the exhaust port mufflers for any signs of pneumatic oil mist, which indicates internal piston seal wear.
Torque Adjustments: Verify lining wear indicators; maintain correct backing clearance to prevent air stroke inflation from slowing down engagement speeds.
FAQ
Q: What minimum air pressure is required to keep this fail-safe brake fully released?
A: Standard models require a minimum air pressure of 4.5 to 5.5 bar to fully compress the internal springs and clear the friction path. Lower pressures can cause the brake shoes to drag.
Q: How does a pneumatic safety brake compare to an electromagnetic brake?
A: Pneumatic fail-safe brakes deliver significantly higher torque-to-size ratios, run cooler because they do not have electric coils drawing continuous power, and are naturally explosion-proof.
Q: Can this brake handle tension control applications, or is it strictly for on-off safety stops?
A: This specific series is built as a spring-applied fail-safe brake for emergency stops and holding. For continuous tensioning or slipping duty, please ask our team for our air-applied, pressure-modulated tension brake series.
Q: Are the friction linings easily replaceable without removing the brake from the main shaft?
A: Yes. Our caliper/shoe housing design uses split retaining configurations, allowing maintenance technicians to slide out the worn lining pads simply by removing the side access bolts.
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