YT1 Series Electro Hydraulic Thrusters

 

2. Working Principle

The YT1 Series operates on a simplified electro-hydraulic conversion principle, integrating a centrifugal pump and single-acting cylinder to deliver linear thrust. Its working cycle includes three key states:

2.1 1. Thrust Generation (Actuation)

When activated, the thruster's electric motor drives an integrated centrifugal pump. The pump draws hydraulic oil from the internal reservoir and pressurizes it (typically 6–12 MPa, depending on the model).

Pressurized oil flows into the single-acting hydraulic cylinder, pushing the piston and output rod outward. This generates linear thrust (180–3,200 N) to actuate the target mechanism-e.g., releasing a brake by overcoming spring tension.

2.2 2. Thrust Retention (Sustained Actuation)

Once the output rod reaches the maximum stroke (20–200 mm), the centrifugal pump continues to run, but excess oil is redirected back to the reservoir via an internal relief valve. This maintains stable pressure in the cylinder, keeping the thruster in the extended position without overloading the motor.

2.3 3. Thrust Cessation (Reset)

When de-energized (e.g., machinery stopping or emergency), the motor and pump shut down. Hydraulic pressure dissipates, and the target mechanism's return force (e.g., brake spring tension) pushes the output rod back. Oil flows back to the reservoir, resetting the thruster to its retracted state-allowing the brake to engage or the valve to close.

3. Core Structure & Key Components

The YT1 Series features a lightweight, integrated design with four critical subsystems, optimized for space efficiency and ease of maintenance:

3.1 1. Electric Motor (Power Input)

A three-phase AC induction motor (standard: 380V AC, 50Hz; customizable to 220V AC/60Hz) with power ratings from 0.12–1.1 kW. It uses Class B or F insulation (optional) for heat resistance up to 155°C, suitable for moderate-temperature industrial environments.

The motor is directly flange-mounted to the pump, eliminating transmission components and reducing overall weight (5–30 kg per unit).

3.2 2. Hydraulic Power Unit (Energy Conversion)

Centrifugal Pump: A compact, low-noise pump designed for short-duty cycles, converting motor rotation into hydraulic pressure. Its simple structure minimizes maintenance needs compared to gear or vane pumps.

Internal Reservoir: A cast aluminum or steel reservoir (capacity: 0.2–1.5 L) integrated into the thruster housing. It stores hydraulic oil and includes an oil level gauge for easy inspection.

Relief Valve: A built-in safety valve that limits maximum system pressure, protecting the pump, cylinder, and seals from overpressure damage.

3.3 3. Hydraulic Cylinder (Force Output)

A single-acting cylinder with a chrome-plated output rod (diameter: 12–40 mm) for corrosion resistance and smooth movement. The rod's stroke (20–200 mm) and the cylinder's bore (25–80 mm) determine the thruster's force and travel range.

High-quality seals (Nitrile Rubber/NBR as standard; Fluoropolymer/FKM optional for high temperatures) prevent oil leakage, ensuring reliable performance in temperatures from -20°C to 80°C.

3.4 4. Installation & Protection Components (Adaptability)

Universal Mounting: A rotatable base (90° adjustment) and 360° swiveling rod head allow installation in vertical, horizontal, or inclined (≤15°) orientations, adapting to diverse machinery layouts.

Balance Air Chamber: A chamber on the cylinder casing equalizes internal pressure, enabling flexible mounting angles without affecting oil flow.

Environmental Protection: The motor junction box uses sealed cable glands, and the overall enclosure reaches IP54 protection (optional IP65 for harsh environments), resisting dust and splashing water.

4. Key Features & Advantages

The YT1 Series is distinguished by its simplicity, adaptability, and cost-effectiveness for light-to-medium duty actuation:

4.1 1. Compact & Lightweight Design

Integration of motor, pump, and reservoir into one unit reduces installation space by 50% compared to split hydraulic systems. The cast aluminum housing further lowers weight, making it ideal for machinery with limited load capacity (e.g., small winches).

4.2 2. Fast Response & Short-Duty Efficiency

Thrust build-up time (from startup to full stroke) is ≤ 0.5–1.0 seconds, matching the quick cycle demands of intermittent machinery (e.g., workshop cranes).

Optimized for S2-30min/60min short-duty cycles, the motor and pump avoid overheating during intermittent operation, extending service life.

4.3 3. Easy Installation & Adaptability

Universal mounting angles, rotatable base, and swiveling rod head eliminate the need for custom brackets, simplifying integration into existing systems (e.g., retrofitting YWZ4 brakes).

4.4 4. Low Maintenance & Long Service Life

Self-lubricating hydraulic components (oil acts as lubricant) reduce wear on moving parts.

High-quality seals (NBR/FKM) and stainless steel fasteners resist corrosion, ensuring a service life of ≥ 8,000 working hours under normal use.

4.5 5. Customizable & Cost-Effective

Voltage (220V/380V AC) and insulation class (B/F) can be customized to match local power systems and environmental conditions.

The simplified centrifugal pump design lowers manufacturing and maintenance costs, making it an economical choice for light-to-medium duty applications.

5. Typical Applications

The YT1 Series is widely used as an actuation unit across light-to-medium industrial machinery:

Brake Systems: Primary drive for YWZ4/YWZ4-A series drum brakes in small overhead cranes, workshop winches, and light conveyors.

Industrial Valves & Gates: Actuating control valves, sluice gates, and dampers in water treatment, HVAC, and cement plants.

Mechanical Mechanisms: Driving clamping devices, swing arms, and positioning mechanisms in assembly lines, packaging equipment, and textile machines.

Light Mining/Logistics: Actuating brakes for small mining conveyors and warehouse material handlers, where compact size and low weight are critical.

 

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