Heavy-Duty Performance | High Torque Density | Precision Angle Control
Our comprehensive line of Rotary Hydraulic Cylinders converts high-pressure hydraulic energy into limited-angle rotary mechanical energy. Unlike continuous-rotation hydraulic motors, these compact executive components deliver exceptional output torque and high-precision angular positioning, making them the ultimate solution for high-load, space-constrained industrial applications.
Core Advantages & Technical Benefits
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High Torque Density: Delivers massive rotational torque within an ultra-compact footprint, making it ideal for tight, high-load installation spaces.
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Zero Backlash & Precise Positioning: Direct-drive engineering ensures outstanding repeatability, structural rigidity, and exceptional stability.
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Robust Shock Resistance: The fully enclosed, heavy-duty structure withstands severe dust, high humidity, marine corrosion, and intense impact loads.
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Hydraulic Self-Locking Security: Features absolute position-holding capabilities under continuous pressure holding conditions for maximum operational safety.
Working Principles & Main Mechanisms
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Rack & Pinion Type: The linear movement of the internal piston drives the heavy-duty rack, which turns the integrated gear to rotate the output shaft (Best for up to 360° rotation and heavy turning).
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Helical/Spiral Slot Type: Piston rods equipped with guide pins slide along precision-machined internal helical grooves, smoothly translating linear strokes into precise rotation (Standard 90°, zero backlash).
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Vane Type: High-pressure hydraulic oil directly pushes the internal vanes to generate instant rotational torque, featuring an ultra-compact and fast-response design (Best for up to 270° rotation).
Technical Specification & Selection Matrix
1. Mechanism Type Comparison
| Cylinder Type | Standard Rotation Angles | Rated Pressure (MPa) | Output Torque Range | Key Features | Primary Applications |
| Vane Type | 90° / 180° / 270° | 7 – 21 | Low to Medium | Compact footprint, rapid response, lightweight | 3C automation, light fixtures, indexing tables |
| Rack & Pinion | 90° / 180° / 360° | 16 – 31.5 | Medium to High | Maximum shock load resistance, wide angle ranges | Construction machinery, heavy-duty turnover |
| Helical / Spiral | Standard 90° (Customizable) | 16 – 31.5 | Medium | Ultra-precise positioning, minimal backlash | Machine tool chucks, precision workholding |
| Hollow Rotary | 90° / 180° | 16 – 21 | Medium | Center through-hole for routing rods, pipes, lines | CNC lathes, automatic bar feeders |
2. General Specifications
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Rated Pressure Range: 7 MPa to 35 MPa (Standard industrial configurations: 21 MPa / 31.5 MPa)
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Standard Angular Configurations: 90° (Most Common), 180°, 270°, 360° (Full periphery rotation available via rack & pinion).
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Output Torque Range: Several hundred to tens of thousands of $\text{N}\cdot\text{m}$ (Up to 50,000 $\text{N}\cdot\text{m}$).
Mounting Options & Customized Configurations
To match diverse mechanical frame layouts, we support multiple mounting styles and optional integrations:
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Mounting Structures: Upper Flange, Lower Flange, Square Base (Side/Bottom tapped holes), Shaft-End Direct Connection, and Built-In/Embedded styles.
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End Cushioning Devices: Optional hydraulic or rubber cushions for high-frequency start-stop cycles to eliminate inertial impacts.
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Position Feedback: Optional integration of high-precision angle sensors/proximity switches for closed-loop automated control.
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Surface Protection: Optional specialized anti-corrosion marine coatings and heavy-duty dust boots for outdoor or corrosive environments.
Typical Applications
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Workholding & Fixtures: 90° rotary clamping and quick-clamping mechanism arm-swings in automotive and 3C CNC machining lines.
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Construction & Heavy Machinery: Excavator attachments, log grapples, pile drivers, and heavy steering mechanisms.
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Machine Tools & Turning Centers: Lathe power chuck actuation, rotary table indexing, and tool magazine flipping.
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Factory Automation & Robotics: Heavy-duty AGV/AMR steering wheels, robotic wrist joints, and palletizing turnover units.
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Marine & Offshore Engineering: Marine crane slewing, deck machinery, and heavy-duty industrial valve actuators.
