Aerial platform rotary actuator enabling basket swing

Aerial Work Platform · 7th of 7 · #31 Final Product

Aerial Work Platform
Rotary Actuator

The only true rotary actuator in 31 products. Not a cylinder with a linkage — a vane or gear mechanism that produces rotation directly. 360° of continuous swing from a compact housing that fits inside the boom knuckle joint. The final product in Korea Ever-Power's mobile machinery range.

500–5,000 NmTorque

0–360°Swing Angle

21 MPaStandard Pressure

True Rotary — Not a Cylinder with a Linkage, Not a Motor with a Gearbox

Rotary actuator internal vane mechanism

Product #5 (small excavator rotary actuator) carries the name "rotary" but is actually a linear cylinder connected to a swing linkage — the cylinder pushes a lever arm, and the lever arm rotates the boom. This works for the excavator's limited ±30° offset angle, but it cannot produce continuous 360° rotation, and the packaging is too bulky for the tight knuckle joints of an aerial platform boom.

Product #16 is genuinely rotary: a vane or gear set inside a cylindrical housing converts hydraulic pressure directly into rotational torque. The output shaft rotates — no linkage, no lever arm, no angular limitation. The compact cylindrical housing bolts directly into the boom knuckle joint or basket pivot, producing smooth 360° rotation from a package that occupies 30–50% less volume than a cylinder-and-linkage arrangement producing the same torque.

Korea Ever-Power manufactures the rotary actuator as the seventh and final product in the aerial work platform hydraulic cylinder range — and the 31st and final product in the complete mobile machinery catalogue.

Technical Specifications

Parameter	Specification
Product	Aerial Work Platform Rotary Actuator
Function	Platform and crank arm swing (0–360° rotation)
Type	Vane type (≤2,000 Nm) / Gear type (2,000–5,000 Nm)
Torque	500 – 5,000 Nm
Swing Angle	0 – 360°
Pressure	21 MPa (standard working pressure)
Application	Aerial Work Platform (basket swing, crank arm, jib rotation)
Certification	ISO 9001 · EN 280 / ANSI A92 compatible

Vane vs Gear — Two Mechanisms for Different Torque Ranges

Vane type — compact, 500–2,000 Nm

A single or double vane inside a cylindrical housing swings under hydraulic pressure, producing torque proportional to the vane area × pressure × radius. Vane actuators are compact and lightweight — ideal for platform basket swing and jib rotation on smaller boom lifts. Single-vane designs achieve 360° continuous rotation; double-vane designs produce 2× torque but limit the angle to 90–180°.

Gear type — robust, 2,000–5,000 Nm

A rack-and-pinion or helical gear mechanism converts the linear force of an internal piston into rotary output. Gear actuators handle higher torque and greater shock loads than vane types — suitable for heavy crank arm swing on large articulating booms. The gear mechanism also provides more precise angular positioning (±0.5°) than vane types (±1–2°). Contact Korea Ever-Power for rotary actuator selection guidance.

Rotary actuator enabling platform basket swing

Manufacturing Process

Vane actuators: the housing bore is honed to Ra 0.2–0.4 µm — the vane tip seals against the bore, so the bore finish directly affects internal leakage and torque efficiency. Vane-tip seals are PTFE-composite for low friction and 20,000+ hour life. Gear actuators: the rack is precision-ground and induction-hardened; the pinion is carburised steel; mesh backlash ≤0.05 mm for precise angular positioning.

Both types are hydrostatic tested at 1.5× rated pressure (31.5 MPa) and torque-tested at rated pressure — verifying that output torque matches the specification within ±5%. Every rotary actuator is swing-tested for smooth 360° rotation (vane) or full-angle rotation (gear) without stick-slip, cogging, or torque ripple.

OEM & ODM

What You Provide

Platform model, required torque, swing angle, rotation speed, angular positioning accuracy, type preference (vane/gear), mounting envelope (housing diameter and depth), system pressure, and the boom knuckle joint or basket pivot assembly drawing.

What the Factory Delivers

Rotary actuator (vane or gear) with engineering drawing, torque, angle, housing dimensions, shaft output, and mounting details. Hydrostatic + torque + smooth-rotation test certificate. Seal kits. Browse the mobile machinery cylinder family and the Korea Ever-Power catalogue.

Workshop

FAQ

How does this differ from the excavator rotary actuator (#5)?

#5 is a linear cylinder connected to a swing linkage — it converts linear motion to rotation through an external mechanism and is limited to approximately ±30° of boom offset. #16 is a true rotary device — the internal vane or gear produces rotation directly, achieving continuous 360° swing in a compact housing. The true rotary design is smaller, smoother, and unrestricted in angle.

Why only 21 MPa — lower than the other AWP cylinders at 30 MPa?

The torque requirement for platform basket swing (500–5,000 Nm) is modest compared to the linear force requirements of the luffing, telescopic, and outrigger cylinders. 21 MPa standard pressure produces adequate torque from the vane/gear geometry without requiring the heavier housings, seals, and port fittings needed at 30 MPa. The lower pressure also reduces seal wear and extends service life — important for a component that operates continuously during every basket repositioning movement.

Can Korea Ever-Power supply the complete 7-product aerial platform set?

Yes — electric cylinder (#10), luffing (#11), outrigger (#12), telescopic (#13), leveling (#14), steering (#15), and rotary actuator (#16) are available as a complete matched system for aerial platform OEMs. This final product completes the 31-product Korea Ever-Power mobile machinery hydraulic cylinder catalogue — spanning 6 equipment categories from small excavators to mining dump trucks to aerial work platforms. Browse telescopic cylinders and industrial engineering cylinders.