YZA10-20 Series Hydraulic Power Unit

The YZA10-20 Series​ is a compact, modular, and high-reliability hydraulic power unit (HPU) or hydraulic power pack. It is designed to generate, control, and deliver pressurized hydraulic fluid to actuate a single cylinder or a simple hydraulic circuit, most commonly as the power source for single-acting, spring-return hydraulic actuators​ like those used in industrial disc brakes.

Core Function & Design Philosophy

Unlike the self-contained electro-hydraulic thruster, the YZA10-20 is a modular component system. It separates the functions of power generation (motor+pump+reservoir) and actuation (the separate hydraulic cylinder/actuator). This design offers greater flexibility in system layout and servicing.

Its primary purpose is to provide a compact, integrated power source for fail-safe, spring-applied brakes. When energized, it builds pressure to retract the spring-applied brake (extend or retract the piston of a separate hydraulic cylinder). When de-energized, system pressure is released, and the brake's spring force returns the piston, expelling fluid back to the reservoir.

Key Components & Features

Integrated Power Pack Design:

Reservoir/Tank:​ A small, sealed oil tank (e.g., 0.1 to 0.5 liters) is integrated into the unit body.

Electric Motor:​ A standard AC induction motor (e.g., 0.18 kW ~ 0.37 kW) provides the drive.

Hydraulic Pump:​ A small, fixed-displacement gear or vane pump generates fluid flow and pressure.

Modular & Compact Construction:​ The motor, pump, and reservoir are combined into a single, block-like unit, minimizing footprint and leak points. The "10-20" designation often relates to its displacement or pressure class.

Designed for Spring-Return (Single-Acting) Circuits:​ It is optimized to work with a single-acting hydraulic cylinder. The pump supplies pressure in one direction only (to release the brake). The spring in the connected actuator provides the return force and fluid displacement back to the reservoir.

Integrated Manifold/Valve Block (Typical):​ The unit often incorporates essential control valves:

Pressure Relief Valve:​ Protects the system from overpressure.

Non-Return Valve (Check Valve):​ Maintains pressure in the line to hold the brake released, even when the motor is off for short periods.

Manual Release Valve (Optional but common):​ A manual screw or plunger to mechanically release system pressure, allowing the spring to apply the brake for maintenance or testing.

Dry Motor Design:​ The electric motor is completely separate from the hydraulic fluid, enhancing electrical safety and motor longevity.

Typical Technical Data

Motor Power:​ Small, typically 0.18 kW, 0.25 kW, or 0.37 kW (1/4 HP, 1/3 HP, 1/2 HP).

Voltage:​ Standard 3-phase (380V, 415V, 50Hz) or single-phase (110V, 220V) options.

Rated Pressure:​ Commonly in the range of 40 to 70 bar (580 to 1015 psi).

Displacement/Flow Rate:​ Low flow, suited for small to medium cylinder volumes (e.g., 0.1 - 0.3 cm³/rev).

Reservoir Capacity:​ Small, typically 0.1L to 0.5L.

Duty Cycle:​ Suitable for intermittent or continuous duty, depending on motor sizing and cooling.

Primary Application

Its dominant application​ is as the power source for spring-applied, hydraulically released (SAHR) brake calipers​ on:

Machine Tools:​ Spindle brakes, axis holding brakes.

Servo Motors & Gearboxes:​ Holding brakes on industrial robots and precision drives.

Wind Turbines:​ Pitch and yaw brakes, safety locks.

Material Handling:​ Conveyor stop brakes, indexing systems.

It is the preferred alternative to pneumatic systems where only hydraulic or electric power is available.

Advantages

Compact and Integrated:​ Saves space and simplifies piping.

Flexible Installation:​ Can be remotely mounted from the brake actuator.

Reliable and Clean:​ Eliminates the need for a large, central hydraulic system or compressed air lines.

Maintainable:​ Individual components (motor, pump) can be serviced or replaced separately.

Quiet Operation:​ Compared to larger HPUs.

Summary

The YZA10-20 Series Hydraulic Power Unit​ is a compact, modular, and efficient power source designed specifically to control spring-applied, hydraulically released braking systems. It represents a system-level approach, separating the power generation (HPU) from the work component (brake cylinder), offering flexibility, reliability, and easy maintenance for industrial motion control and safety applications. It is the core of a modular hydraulic brake release system.

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