Rotary actuators convert compressed air into limited-angle reciprocating rotary motion, with options from 90° to 360°. They are ideal for automation applications such as workpiece flipping, valve actuation, indexing positioning, and material redirection.
Fokca primarily offers three original SMC series: MSQ rotary table type (integrated platform for direct load mounting), CRQ2 thin type (ultra-slim design), and CRA1 standard type (compact and lightweight). All series feature rack-and-pinion construction with zero backlash, constant torque, and consistent positioning accuracy in both directions.
A rotary actuator, also known as an oscillating cylinder, is a pneumatic actuator that converts compressed air into reciprocating rotary motion within a limited angle. Unlike standard cylinders that produce linear motion, a rotary actuator swings its output shaft back and forth over a defined angular range, typically from 90° to 360°.
Rotary actuators are mainly classified into two types: rack-and-pinion and vane type. Fokca focuses on three major rack-and-pinion series—MSQ, CRQ2, and CRA1—covering a full range of applications from high-speed light loads to heavy-duty, high-precision requirements.
When compressed air enters one side of the cylinder, it drives the piston (rack) in a linear motion. The rack engages with a gear on the output shaft, converting the linear motion into rotary motion. When air is supplied to the opposite side, the piston moves in reverse, causing the output shaft to rotate in the opposite direction.
The key advantages of the rack-and-pinion design include:
· Symmetrical dual-piston structure eliminates backlash, ensuring consistent positioning accuracy in both directions
· Constant output torque throughout the entire rotation angle
· High structural rigidity, capable of withstanding significant radial and axial loads
| Characteristic | MSQ Series | CRQ2 Series | CRA1 Series |
|---|---|---|---|
| Structure Type | Rack & pinion | Rack & pinion | Rack & pinion |
| Positioning | Rotary table unit | Compact rotary actuator | Standard rotary actuator |
| Size Range | 10, 20, 30, 50, 70, 100, 200 | 10, 15, 20, 30, 40 | 30, 50, 63, 80, 100 |
| Rotation Angle | 0–190° continuously adjustable | 90°, 180°, 270° | 90°, 100°, 180°, 190° |
| Angle Adjustment | Fully adjustable | ±5° at each end | Fixed or adjustable types |
| Cushioning | Internal / external | Internal | Adjustable cushioning |
| Load Mounting | Direct mounting supported | Can be used as flange | External mounting required |
| Magnetic Switch | Supported | Supported | Supported |
| Design Features | Integrated platform with bearings | Compact and lightweight | Standard design |
| Port Direction | End / side optional | Single-side porting | Front porting |
| Applications | Workpiece rotation, transfer, indexing | Space-limited, light-duty rotation | Valve actuation, material flipping |
1. For the MSQ series, adjust the swing angle using the adjustment screws. Be sure to tighten the lock nut after adjustment to prevent loosening.
2. In high-speed or heavy-load applications, adjust the cushioning needle valve to avoid piston impact damage to the end cover.
3. The MSQ series includes built-in bearings that can handle certain radial and axial loads. For loads exceeding rated limits, external guides are required.
4. The CRQ2 series allows two magnetic switches to be installed on the same side for intermediate position detection.
5. Regularly check whether the output shaft is loose, whether cushioning is functioning properly, and whether mounting screws are secure.
Q1: What is the difference between rack-and-pinion and vane-type rotary actuators?
A1: Rack-and-pinion actuators provide constant torque, no backlash, and can be equipped with cushioning, making them suitable for heavy-duty and high-precision applications. Vane-type actuators are more compact and cost-effective, but their torque varies with angle, making them better suited for light-duty applications. Fokca primarily offers rack-and-pinion types.
Q2: How is the rotation angle of the MSQ series adjusted?
A2: The MSQ series allows continuous adjustment from 0 to 190° via angle adjustment screws on the end cover. Loosen the lock nut, rotate the adjustment screw to set the angle, and tighten the lock nut afterward.
Q3: Can rotary actuators withstand external loads?
A3: The MSQ series features built-in large bearings, allowing it to directly handle radial and axial loads and support direct workpiece mounting. The CRQ2 and CRA1 series mainly provide rotary output; for larger loads, external support is recommended.
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