YWZ4-100/E23 Drum Brake

The YWZ4-100/E23 is a medium-duty industrial drum brake engineered for stopping, load-holding, and speed control of rotating machinery-including small-to-medium conveyors, winches, cranes, and mechanical transmission systems. Classified as a fail-safe, spring-engaged, electro-hydraulic released brake, it features a compact design optimized for light-to-medium loads and easy integration. The model designation (YWZ4-100/E23) clarifies its core parameters: "YWZ4" for the 4th-generation Drum Brake series, "100" for the brake drum diameter (100 mm), and "E23" for the matched electro-hydraulic thruster model (providing release power). Widely used in general industry, logistics, and light mining, it ensures reliable operation under loads of 50–300 tons and moderate working conditions (dust, normal temperature). Below is a detailed breakdown of its core attributes, working principle, key features, typical applications, and technical specifications:

1. Model Interpretation & Core Function

The YWZ4-100/E23's model code directly reflects its design and matching components, facilitating quick equipment pairing:

Model Segment	Meaning
YWZ4	4th-Generation Drum Brake (spring-engaged, electro-hydraulic released)
100	Brake drum diameter: 100 mm (small-sized drum for light-to-medium loads)
E23	Matched electro-hydraulic thruster model (E-series, 23 denotes thrust/power parameters)

Its core functions target safety and control for medium-duty machinery:

Normal Braking: Decelerating or stopping machinery smoothly during routine operation, matching the equipment's working cycle.

Emergency Stopping: Rapidly engaging in power loss, overspeed, or system faults to prevent machinery runaway.

Static Load Holding: Securing loads (e.g., lifted goods, conveyor materials) during downtime or maintenance to avoid accidental movement.

2. Working Principle

The YWZ4-100/E23 operates on a fail-safe principle (spring-engaged for braking, electro-hydraulic thrust for release), ensuring safety even if the power system fails. Its working cycle includes three key states:

2.1 Brake Engagement (Safety State)

When the machinery is stationary, in emergency, or powered off, internal compression springs expand to push the brake shoes outward.

The brake shoes (lined with friction material) press tightly against the inner surface of the rotating drum, generating braking torque through friction to stop the drum or hold it stationary.

2.2 Brake Release (Operating State)

When the machinery needs to run, the matched E23 electro-hydraulic thruster is activated. The thruster converts electrical energy into linear hydraulic thrust.

The thrust pulls the brake lever mechanism, compressing the internal springs and retracting the brake shoes from the drum-creating a 0.3–0.5 mm clearance.

The drum rotates freely with the machinery shaft, enabling normal operation.

2.3 Emergency Response (Fault State)

In case of power loss, thruster failure, or emergency shutdown, the thruster's thrust dissipates instantly.

The compression springs expand immediately, driving the brake shoes to clamp the drum-engaging the brake within ≤ 0.5 seconds to stop the machinery quickly.

3. Core Structure & Key Components

The YWZ4-100/E23 features a compact, modular design with four critical subsystems, optimized for ease of installation and maintenance:

3.1 Brake Drum & Shoe Assembly (Friction Core)

Brake Drum: 100 mm diameter, made of HT200 gray cast iron with a quenched inner surface (hardness HB 180–220) for wear resistance. The drum is mounted on the machinery shaft via a keyway connection.

Brake Shoes: Two arc-shaped steel shoes lined with resin-based friction pads (friction coefficient μ ≥ 0.35). The pads are riveted or bolted to the shoes for easy replacement.

Shoe Support: A cast iron bracket that fixes the shoes and ensures they swing stably during engagement/release.

3.2 Actuation & Spring Mechanism (Power Core)

Matched E23 Electro-Hydraulic Thruster: Provides linear thrust (typically 230 N) to release the brake. It integrates a motor, hydraulic pump, and cylinder, with a rated voltage of 380V AC (50Hz) and power of 0.12 kW.

Compression Springs: High-strength carbon steel (65Mn) springs that provide clamping force (1.5–2.5 kN) for brake engagement. The spring force is adjustable to fine-tune braking torque.

Lever Mechanism: Steel levers that transmit the thruster's thrust to compress the springs, ensuring smooth and efficient brake release.

3.3 Safety & Control Components (Control Core)

Limit Switches: Optional position sensors (one for "engaged," one for "released") that send signals to the PLC, enabling interlock control (machinery starts only when the brake is released).

Adjustment Screws: Used to adjust the brake clearance and spring force, ensuring consistent braking performance.

Manual Release Lever: A mechanical lever for manual brake release during power loss, facilitating maintenance.

3.4 Mounting & Protection Components (Durability Core)

Mounting Base: A steel base with slotted holes for ±5 mm horizontal/vertical adjustment, simplifying alignment with the brake drum during installation.

Dust Cover: A sheet metal cover with IP54 protection, shielding internal components from dust and light water splashes.

Anti-Corrosion Coating: Epoxy resin coating on external metal parts to resist rust and mild industrial corrosion.

4. Key Features & Advantages

The YWZ4-100/E23 stands out for its compact design, reliable performance, and cost-effectiveness, with core benefits:

4.1 Fail-Safe Reliability

Spring-engaged design ensures automatic braking in power or thruster failure, eliminating the risk of machinery runaway-critical for light-to-medium duty lifting and conveying equipment.

4.2 Compact & Space-Saving

Small drum diameter (100 mm) and integrated structure make it suitable for machinery with limited installation space (e.g., small winches, conveyor tail drums).

4.3 Easy Installation & Maintenance

Modular components (replaceable pads, thruster) and adjustable mounting base simplify installation and alignment.

Friction pads can be replaced in ≤ 15 minutes, and the thruster is easy to disassemble for maintenance.

4.4 Stable Braking Performance

Resin-based friction pads have stable friction performance (μ ≥ 0.35) across temperatures (-20°C to 80°C), ensuring consistent braking torque (50–100 N·m).

The arc-shaped shoes fit the drum tightly, distributing friction evenly and avoiding local wear.

4.5 Cost-Effective & Versatile

Low initial cost and maintenance expenses make it an economical choice for general industrial applications.

Compatible with various small-to-medium machinery (winches, conveyors, small cranes) due to its flexible mounting and adjustable braking torque.

5. Typical Applications

The YWZ4-100/E23 is widely used in light-to-medium duty industrial machinery:

Small Winches & Hoists: Safety brakes for electric winches and small hoists in workshops, warehouses, and construction sites-holding lifted goods (500 kg–5 tons) securely.

Light Conveyors: Brakes for belt conveyors and roller conveyors in logistics centers, food processing plants, and small mines-ensuring smooth start-stop and preventing reverse movement on inclines.

Mechanical Transmission Systems: Brakes for small gearboxes, pumps, and fans-controlling speed and stopping quickly during faults.

Small Cranes: Safety brakes for jib cranes and gantry cranes in small workshops-providing reliable braking for light loads (≤ 10 tons).

6. Technical Specifications

Parameter	Specification (YWZ4-100/E23)
Product Type	Fail-safe spring-engaged drum brake (electro-hydraulic released)
Brake Drum
- Diameter	100 mm
- Material	HT200 gray cast iron
- Max Speed	≤ 1500 RPM
Nominal Braking Torque	50–100 N·m
Matched Thruster (E23)
- Thrust Force	230 N
- Power Rating	0.12 kW
- Power Supply	380V AC (50Hz)
Friction Pads
- Material	Resin-based composite
- Friction Coefficient (μ)	≥ 0.35
- Service Life	≥ 8,000 working hours
Operating Conditions
- Temperature Range	-20°C to 80°C
- Protection Class	IP54
- Relative Humidity	≤ 90% (non-condensing)
Response Time
- Engagement	≤ 0.5 seconds
- Release	≤ 0.3 seconds
Mounting Type	Base-mounted
Weight	≈ 12–15 kg
Compliance Standards	GB/T 18839, JB/T 6406

The YWZ4-100/E23 combines compact design, reliable fail-safe performance, and cost-effectiveness, making it an ideal safety component for light-to-medium duty rotating machinery-where operational safety, space efficiency, and affordability are key requirements.

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