The YT1 series electro-hydraulic thruster is a widely used linear actuator integrating an AC motor, centrifugal pump, and hydraulic cylinder. It is mainly paired with drum brakes, disc brakes, and rail clamps for industrial equipment such as cranes, conveyors, and hoists. It adopts a spring-return, hydraulic-drive working mode, featuring stable thrust, low noise, and fail-safe performance. Below is a detailed overview of its core parameters, structural features, working principle, common faults, and maintenance guidelines.
Core Technical Parameters (Typical Models)
The YT1 series has multiple models classified by thrust and stroke (e.g., YT1-25Z/4, YT1-45Z/5, YT1-90Z/8). The following are the general technical specifications of the series:
| Parameter | General Specification |
|---|---|
| Rated Thrust Range | 250–12,500 N |
| Rated Stroke Range | 40–120 mm |
| Motor Power | 0.09–1.5 kW (3-phase AC 380V, 50Hz; single-phase AC 220V optional) |
| Duty Cycle | S3-25%/40%/60% (suitable for intermittent operation) |
| Hydraulic Oil Type | ISO VG32/46 hydraulic oil (low-temperature resistant oil optional for -25℃ environments) |
| Oil Capacity | 0.2–2.5 L (varies by model) |
| Protection Class | IP54/IP55 (motor housing; IP65 optional for outdoor use) |
| Working Temperature | -25℃ to +50℃ |
| Weight | 8–65 kg (varies by model) |
| Compliance Standard | JB/T 10603-2006 |
Key Structural Features
Integrated Compact Design
Combines motor, pump, and cylinder into a single unit, with no external hydraulic pipelines, saving installation space and reducing oil leakage risks.
Equipped with a transparent oil level gauge and drain plug for easy oil level checking and replacement.
Fail-Safe Spring Return Mechanism
When powered on, the motor drives the pump to generate hydraulic pressure, pushing the push rod to extend and release the brake.
When powered off, the internal return spring drives the push rod to retract, enabling the brake to clamp automatically, ensuring equipment safety during power outages.
Adjustable Thrust & Stroke
The thrust can be adjusted by modifying the spring preload; the stroke can be fine-tuned via the limit nut on the push rod to match the brake's release requirements.
Corrosion & Dust Resistance
The motor housing uses a sealed structure; fasteners are galvanized or treated with anti-corrosion coating, suitable for dusty, humid industrial environments.
Working Principle
The YT1 series operates on a hydraulic drive, spring return principle, matching the normally-closed brake's working logic:
Release State (Power-On)
When the motor is energized, it drives the centrifugal pump to rotate, pressurizing the hydraulic oil in the chamber. The high-pressure oil pushes the piston and push rod outward, compressing the brake's braking spring and achieving brake release.
Braking State (Power-Off)
When the power is cut off, the pump stops working, and the hydraulic pressure disappears. The thruster's internal return spring and the brake's braking spring drive the push rod to retract, making the brake clamp the wheel/drum to achieve braking.
Speed Regulation
The extension/retraction speed of the push rod can be adjusted by installing a throttle valve on the oil circuit to meet the brake's response speed requirements.
Typical Applications
Crane Equipment: Paired with YWZ series drum brakes for lifting and traveling mechanism braking of overhead cranes, gantry cranes, and port cranes.
Conveying Machinery: Used for belt conveyor belt tensioning and emergency braking systems.
Mining & Metallurgical Equipment: Matched with heavy-duty brakes for mine hoists, blast furnace charging machines, and other high-load equipment.
Rail Clamps: Coordinated with YFX series wind-resistant wedge brakes to provide release power for rail clamping devices.
