Understanding the Structure and Mechanism of Hydraulic Rotary Actuators

Hydraulic rotary actuators are essential components in industrial and mobile machinery, converting hydraulic energy into controlled rotational motion. This article delves into the structural design and working principles of the CY2 series hydraulic rotary actuator, with a focus on its key components and features.

Key Components of the CY2 Hydraulic Rotary Actuator

The structure of the CY2 series hydraulic rotary actuator is meticulously designed to ensure efficiency and durability. Below are its major components:

1. Integrated Gear Ring (1): The gear ring is integrated into the actuator housing and remains stationary during operation. Its internal grooves interact with the piston sleeve’s helical splines to facilitate rotational motion.

2. Central Shaft (2): This shaft features a mounting flange and integral bearings, which provide robust support for both axial and radial loads. The shaft connects directly to the machinery and transmits rotational motion.

3. Piston Sleeve (3): The annular piston sleeve has internal and external helical grooves. These grooves engage with the central shaft and the gear ring, translating linear hydraulic force into rotational motion.

4. End Cap (4): The end cap seals the actuator housing, maintains axial clearances, and allows adjustments with screws and retaining pins. It also ensures the system is pressurized effectively.

Operational Mechanism

The CY2 hydraulic rotary actuator converts linear motion into rotational motion using a double-helical spline system:

1. When hydraulic fluid is introduced into the actuator, pressure forces the piston sleeve to move axially.

2. The internal helical splines of the piston sleeve engage with the central shaft, causing it to rotate.

3. Simultaneously, the sleeve’s external splines interact with the stationary gear ring, doubling the rotational effect.

This synchronized action results in precise and powerful rotational motion, making the actuator ideal for tasks requiring high torque and accuracy.

Load Support and Durability

The CY2 series actuators are engineered for heavy-duty performance, with features that enhance their durability:

Radial Load Support: High-strength guide rings (e.g., 302) prevent wear and distribute loads evenly.

Axial Load Isolation: Thrust washers (304) absorb axial forces, reducing stress on the central shaft.

Counterbalance Valve: Built-in valves provide overload protection, positional locking, and controlled rotation under eccentric loads.

Maintenance and Customization

Regular maintenance and the use of proper tools are crucial for the longevity of hydraulic rotary actuators. The following practices are recommended:

Seal Replacement: Always replace seals and bearings as complete kits to ensure compatibility and performance.

Timing Adjustments: Use markers and inspection tools to align timing marks during reassembly.

Customized Tools: Create or use specialized tools, such as modified screwdrivers, to simplify seal installation and avoid damage to components.

Applications of the CY2 Series Hydraulic Rotary Actuator

With its compact structure, high torque output, and reliable operation, the CY2 series is widely used in:

Industrial Automation: Positioning systems and robotic arms.

Construction Machinery: Boom rotation and grapple operations.

Mining Equipment: Drill positioning and material handling.

Vehicle Systems: Steering mechanisms and traction systems.

Conclusion

The CY2 series hydraulic rotary actuator showcases an innovative design that combines strength, precision, and adaptability. Understanding its structure and mechanism highlights why it is a preferred choice for demanding industrial and mobile applications.

For more insights into hydraulic rotary actuators or technical support, contact Changsha Chiyu Hydraulic Equipment Co., Ltd. or refer to your equipment’s serial number for detailed specifications. Ensure proper maintenance and use authentic components to maximize performance and durability.