Wuxi Tengye Machinery Co., Ltd. manufactures high-precision hydraulic and pneumatic cylinders and cylinder components, including rotary swing-type cylinders that convert hydraulic power into reciprocating rotary motion.Tengye

 

A rotary actuator — commonly called a swing cylinder, oscillating cylinder or oscillating cylinder — is a hydraulic component that outputs rotary torque and reciprocating swing motion instead of linear movement. Where a standard cylinder extends and retracts a piston rod, a rotary actuator rotates an output shaft through a controlled angle. It is widely used in automation, material handling, robotic systems and machine tools where precise angular positioning and high torque are required.

 

 

 

A rotary actuator operates on the same Pascal's principle as a linear hydraulic cylinder: pressure applied to a sealed liquid is transmitted equally in all directions.Tengye

 

Pressurized oil enters one chamber of the actuator, pushing against a vane, piston rack or helical spline mechanism. This converts the linear hydraulic force into rotational torque on the output shaft. When the oil flow is reversed, the output shaft rotates back in the opposite direction, producing controlled reciprocating swing motion.

 

 

- Housing and end caps — contain the working chambers and withstand system pressure.

- Output shaft — transmits torque to the driven mechanism.

- Vane, piston rack or helical spline — the mechanism that converts hydraulic force into rotation.

- Sealing system — high-pressure seals prevent internal and external leakage.

- Bearings — support the shaft and handle radial and axial loads.

 

 

 

One or more vanes are fixed to the output shaft inside a circular housing. Oil pressure pushes the vane, rotating the shaft. Compact and light, vane types typically provide swing angles up to approximately 280°.

 

A hydraulic piston drives a rack, which meshes with a pinion gear on the output shaft, converting linear motion into rotation. This design delivers high torque and can provide swing angles up to 360° with precise positioning.

 

A helical spline mechanism converts piston movement into rotation within a compact envelope, offering high torque density and angular precision — ideal for space-constrained applications.

 

 

 

- High torque output — powerful rotation from a compact package.

- Precise angular control — accurate swing angle for positioning and indexing.

- Smooth, shock-resistant motion — hydraulic damping provides controlled movement.

- High reliability — robust construction suited to harsh industrial environments.

- Direct rotary drive — eliminates the need for gearboxes or linkage mechanisms.

 

 

 

- Industrial automation — clamping, indexing, turning and material handling.

- Robotic systems — wrist rotation and gripper positioning.

- Valve actuation — quarter-turn ball and butterfly valve operation.

- Construction and engineering machinery — bucket rotation, boom swing and attachment positioning.

- Metallurgical equipment — tilting, flipping and positioning of heavy components.

- Packaging and food machinery — product flipping and orientation.

 

 

 

1. Required torque — calculate the torque needed to drive your load.

2. Swing angle — determine whether you need up to 90°, 180°, 280° or full 360° rotation.

3. Operating pressure — match the actuator to your system's pressure level.

4. Speed and cycle time — select the flow and size that meet production cycle requirements.

5. Mounting and environment — consider shaft configuration, load type and working conditions.

6. Seal and material quality — choose reliable seals and precision-machined components for long service life.

 

 

Wuxi Tengye Machinery Co., Ltd. combines more than 10 years of precision tube and cylinder manufacturing experience to produce hydraulic and pneumatic cylinders, custom rotary actuators and their precision cylinder barrels and piston rods. Located in Wuxi, near Shanghai Port, the company supplies quality components to customers worldwide.Tengye

 

Contact Tengye Machinery with your swing angle, torque and installation requirements to receive a tailored rotary actuator solution.