The YWZ4-400/D45 (often written as YWZ4-400/45) is a medium - duty electro - hydraulic drum brake (400 mm drum diameter, matched with YT1-45Z/6 thruster). It is suitable for working and parking braking of medium - sized cranes, conveyors, and hoists, with a rated braking torque of 1000 N·m and reliable fail - safe performance.
Core Specifications
| Parameter | Value |
|---|---|
| Drum diameter | 400 mm |
| Rated braking torque | 1000 N·m (adjustable range: 400–1000 N·m) |
| Matched thruster | YT1-45Z/6 (450 N thrust, 60 mm stroke) |
| Brake clearance | 0.8–1.2 mm (manual adjustment) |
| Friction lining | Non - asbestos, thickness 16 mm (replace when ≤5 mm) |
| Operating system | Normally closed (spring - applied, electro - hydraulic released) |
| Ambient temp | -20 °C to +50 °C |
| Weight | ~68 kg |
| Installation center height | 320 mm |
| Insulation class | B (thruster motor) |
| Action frequency | Up to 1200 times/hour |
Structure & Working Principle
Key Advantages
Applications
Installation & Maintenance
Structure: Reinforced brake frame + left/right brake shoes + high - stiffness return spring + manual clearance adjustment mechanism + YT1-45Z/6 electro - hydraulic thruster + fixed base. The main swing hinge points are equipped with self - lubricating bearings, which have high transmission efficiency and do not need lubrication during use.
Fail - Safe Operation:
Power - on (release): The thruster motor starts, and the hydraulic pressure pushes the pushrod upward. Through the lever mechanism, the brake shoes retract, compressing the return spring, and the brake releases.
Power - off (braking): The thruster loses power, the pushrod retracts under the action of spring force and gravity. The return spring rebounds, driving the brake shoes to clamp the drum, realizing stable braking.
High - torque output: The 1000 N·m rated torque can meet the braking requirements of medium - sized heavy - duty equipment.
Reliable safety: The normally closed design ensures immediate braking when the power is cut off, preventing equipment sliding.
Low - maintenance: The self - lubricating hinge and manual clearance adjustment mechanism simplify daily maintenance.
Durable: The non - asbestos friction lining has stable friction performance (μ≈0.35) and strong high - temperature resistance.
Good compatibility: It can be interchanged with old YWZ series brakes of the same specification, and the spare parts are easy to obtain.
Primary: Working and parking braking for gantry cranes, bridge cranes, large electric hoists, and heavy - duty belt conveyors in factories, ports, and mining areas.
Secondary: Braking for medium - sized lifting equipment, material handling machinery, and transmission shafts in metallurgy, coal, and chemical industries.
Installation:
Install on a rigid base to avoid vibration during braking. Ensure the drum concentricity (runout ≤0.15 mm) and the thruster pushrod is aligned without lateral force.
Correctly connect the thruster to a 380 V three - phase power supply, and fill the thruster with ISO VG 32/46 hydraulic oil to the specified level.
Before commissioning, adjust the brake clearance to 0.8–1.2 mm (uniform on both sides), and test the flexibility of braking and release.
