YWZ4 Series Electric Hydraulic Drum Brakes: Industrial-Grade Stopping Power for Cranes & Heavy Machinery

The YWZ4 series electric hydraulic drum brakes are the industry standard for reliable stopping power in industrial crane and hoist applications. Engineered for demanding environments, these fail-safe spring-applied brakes deliver consistent performance across a wide torque range of 100 to 8000 N·m, making them the preferred choice for overhead cranes, gantry cranes, and material handling equipment worldwide.

Compatible with both Ed series and YT1 series electro-hydraulic thrusters, the YWZ4 series offers unmatched flexibility for new installations and retrofit projects. With compliance to DIN 15430 and JB/T 6406-2006 standards, these brakes ensure your equipment meets international safety requirements while minimizing maintenance downtime.

## Key Specifications at a Glance

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## Why Choose YWZ4 Series Drum Brakes?

### 1. Self-Lubricating Bearings for Maintenance-Free Operation

The YWZ4 series features self-lubricating bearings at all main swing hinge points, eliminating the need for regular lubrication and reducing maintenance requirements by up to 70% compared to conventional brake designs. This innovation ensures consistent transmission efficiency and extends the operational lifespan of your braking system, even in continuous-duty applications.

### 2. Flexible Brake Pad Installation Options

Choose between riveted or inserted brake pad installation types based on your maintenance preferences and operational requirements. The riveted option provides maximum security for high-vibration environments, while the inserted design allows for faster pad replacement—reducing maintenance downtime by up to 40%.

### 3. Fail-Safe Spring-Applied Design

Safety is paramount in industrial lifting operations. The YWZ4 series employs a spring-applied, power-released design that automatically engages the brake in the event of power failure or thruster malfunction. This fail-safe mechanism ensures your load remains secure even during electrical outages, complying with international crane safety standards.

### 4. Wide Thruster Compatibility

The YWZ4 series works seamlessly with both Ed series (modern, high-efficiency) and YT1 series (classic, proven) electro-hydraulic thrusters. This compatibility ensures easy integration with existing crane systems and provides flexibility for thruster selection based on your specific duty cycle and performance requirements.

## YWZ4 Series Model Specifications

Select the optimal YWZ4 model based on your required braking torque, brake wheel diameter, and thruster preference. Each model is engineered to deliver precise, reliable stopping power for specific load requirements.

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Note: Custom specifications available upon request. Contact our engineering team for models with YT1 series thrusters or special environmental requirements.

## Primary Applications

The YWZ4 series drum brakes are engineered for reliable performance across diverse industrial applications where safety and precision are non-negotiable.

### Overhead & Gantry Cranes

Ideal for bridge cranes, gantry cranes, and jib cranes in manufacturing facilities, warehouses, and logistics centers. The YWZ4 series provides secure holding during loading/unloading operations and emergency stopping capability for hoist, trolley, and bridge motions.

### Construction & Hoisting Equipment

Deployed in tower cranes, construction hoists, and material elevators where exposure to dust, vibration, and varying temperatures demands robust braking performance. The IP65 protection rating ensures reliable operation in challenging construction environments.

### Metallurgy & Steel Mills

Suitable for ladle cranes, charging cranes, and ingot handling equipment in high-temperature environments. Optional high-temperature configurations with heat-resistant brake linings extend operational capability up to 300°C ambient temperature.

### Mining & Bulk Material Handling

Trusted in stacker-reclaimers, conveyor systems, and mine hoists where heavy loads and continuous operation require dependable braking. The fail-safe design ensures load security during power fluctuations common in mining operations.

## How YWZ4 Series Drum Brakes Work

The YWZ4 series operates on a proven spring-applied, hydraulic-release principle that ensures fail-safe performance in critical lifting applications.

### Braking Phase (Power Off)

When electrical power is disconnected or the thruster is de-energized, powerful compression springs force the brake arms to pivot, pressing the brake pads firmly against the rotating brake wheel. The resulting friction generates the rated braking torque, securely holding the load in position.

### Release Phase (Power On)

When the thruster receives power, the internal motor drives a hydraulic pump that extends the thruster rod, overcoming the spring force and releasing the brake pads from the brake wheel. The hydraulic system provides smooth, controlled release action that minimizes mechanical shock to the drive system.

### Torque Calculation

The braking torque of YWZ4 series brakes is calculated using the formula:

T = F × (D/2) × μ × n

**Where:
** **T = Braking torque (N·m)
** **F = Spring force (N)
** **D = Brake wheel diameter (m)
** **μ = Friction coefficient (typically 0.35-0.45)
** n = Number of friction surfaces

## Installation & Operating Requirements

### Environmental Conditions

- Temperature Range: -20°C to +50°C (standard models); -40°C to +50°C (with optional heater) - Relative Humidity: ≤ 90% (non-condensing) - Altitude: ≤ 2000m above sea level - Atmosphere: Free from flammable, explosive, or corrosive gases (corrosion-resistant models available)

### Electrical Requirements

- Thruster Power Supply: 380V/50Hz 3-phase AC (standard); 220V, 415V, 440V available - Duty Cycle: S3-40% (standard); S3-60% available for high-frequency applications - Operating Frequency: Up to 1200 cycles/hour (depending on thruster model)

### Installation Standards

The YWZ4 series conforms to JB/ZQ4388-1997 installation dimensions and JB/T6406-2006 technical requirements, ensuring compatibility with standard industrial mounting configurations. The brake can be installed in horizontal or vertical orientations to accommodate different crane designs.

## YWZ4 vs YWZ8 vs YWZ9: Which Series is Right for You?

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Choose YWZ4 when: You need a reliable, versatile drum brake with wide thruster compatibility for general crane and hoist applications. The YWZ4 series offers the best balance of performance, availability, and cost-effectiveness for most industrial braking requirements.

## Frequently Asked Questions

### What is the difference between YWZ4 and YWZ9 brake series?

The YWZ4 series is a versatile, proven design compatible with both Ed and YT1 thrusters, offering torque up to 8000 N·m. The YWZ9 series features a more modern design with higher capacity (up to 16000 N·m) and is optimized for heavy-duty applications. YWZ4 is ideal for general industrial use, while YWZ9 suits demanding heavy-lift operations.

### How do I select the right YWZ4 model for my crane?

Select based on three factors: (1) Required braking torque (typically 1.75x the load torque for hoisting), (2) Brake wheel diameter matching your crane design, and (3) Thruster selection based on duty cycle. Our engineering team can assist with precise calculations using your motor power, gear ratio, and drum diameter.

### What maintenance does a YWZ4 brake require?

YWZ4 brakes feature self-lubricating bearings that eliminate regular lubrication needs. Maintenance includes: (1) Visual brake pad inspection every 3 months, (2) Air gap adjustment when pad wear exceeds 50%, (3) Thruster oil level check every 6 months, and (4) Annual torque testing. Brake pad replacement is typically needed every 2-5 years depending on duty cycle.

### Can YWZ4 brakes operate in high-temperature environments?

Standard YWZ4 brakes operate from -20°C to +50°C. For steel mills and foundries with ambient temperatures up to 300°C, we offer high-temperature configurations with heat-resistant brake linings, thermal shields, and specialized thrusters. Contact us for metallurgy-grade specifications.

### How does the fail-safe mechanism work?

YWZ4 brakes use a spring-applied, power-released design. When power is cut, compression springs automatically apply the brake. When power is restored, the electro-hydraulic thruster overcomes spring force to release the brake. This ensures the load remains secure during power failures, meeting international crane safety standards.

## Related Products & Accessories

Complete your braking system with these compatible products:

- Ed Series Electro-Hydraulic Thrusters - High-performance thrusters for YWZ4 brakes with precise control and long service life - YT1 Series Electric Hydraulic Actuators - Classic design thrusters, cost-effective alternative for standard applications - YWZ8 Series Electric Hydraulic Drum Brake - Compact design for space-constrained installations - YWZ9 Series Electric Hydraulic Drum Brake - Heavy-duty option for demanding applications up to 16000 N·m - ZDL Series Brake Wheels - Compatible brake wheels in diameters from 100mm to 800mm

## Request a Quote for YWZ4 Series Drum Brakes

Ready to upgrade your crane braking system? Our engineering team is available to help you select the optimal YWZ4 model for your specific application. Provide your requirements and receive a detailed quotation including technical specifications, delivery schedule, and customization options.

Contact us today to discuss your project requirements, request technical documentation, or schedule a consultation with our brake specialists.