ZL30 Winch Drive Planetary Gearbox

ZL30
The catalogue splits here.

Todo winch drive planetary gearbox below the ZL30 was built for the hydraulic era. The ZL30 and every ZL model above it are built for the electric era — 4,000 rpm, helical gears, DIN 5-6 accuracy, and a peak-to-continuous ratio that changes how shock loads are handled.

The vessel or mine has an existing hydraulic power unit. The applicable standard requires an in-drum brake (4xxW has it; ZL does not). The fleet is standardised on 4xxW and cross-compatibility matters. The operating environment is above -25 deg C.

The winch is powered by an electric motor (AC induction, PMSM, BLDC). Regenerative braking energy recovery is part of the energy strategy. Low noise matters (helical gears). The application needs ratios below 60 or above 300 (outside 4xxW range). The VFD provides electronic braking and the motor has an integrated electromagnetic brake.

A grab crane strike produces torque spikes of 180-250% of continuous rated load. At 27,000 Nm continuous x 2.5 = 67,500 Nm peak demand. The ZL30 peak of 75,500 Nm covers this with 12% margin. A 4xxW model at 27,000 Nm continuous (similar to the 407W3 at 26,000 Nm) would peak at approximately 52,000 Nm — insufficient for the 67,500 Nm spike. The ZL30 handles grab duty that the equivalent 4xxW model cannot.

Marine winches handling towing wires, mooring lines, and anchor wires experience snatch loads when the cable goes from slack to taut. These transients can reach 2.5-3.0 times the steady-state tension for 50-200 milliseconds. The ZL30 75,500 Nm peak absorbs snatch events up to 2.8x the continuous rating without exceeding the gear tooth bending limit — allowing the winch designer to size the gearbox based on the continuous duty requirement rather than the worst-case transient.

When the electric motor brake engages at full hoisting speed to perform an emergency stop, the motor deceleration torque plus the suspended load inertia produce a combined torque at the gearbox output that can exceed 2x the steady-state lifting torque. The ZL30 2.8:1 peak ratio provides the margin for these emergency events without gear damage — and the electric motor VFD can be programmed to limit the deceleration rate so the combined torque stays within the 75,500 Nm envelope.

Electric Crane Hoists (10-25 t SWL)

Battery-electric and mains-electric crane hoists replacing hydraulic systems on new-build mobile cranes, tower cranes, and offshore platform cranes. The ZL30 at ratio 40-100 paired with a 100-250 kW PMSM motor provides the hoisting torque with 40% lower noise than the equivalent 4xxW hydraulic system, plus regen braking that recovers 15-25% of the lowering energy. The slewing drive handles the crane rotation on the same electric platform.

Electric Marine Deck Winches

All-electric or hybrid-electric vessel deck winches for mooring, towing, and cargo handling. The ZL30 at ratio 80-200 paired with a 50-150 kW AC induction motor eliminates the hydraulic power unit, oil reservoir, and associated piping — reducing the deck equipment weight by 30-40% and eliminating the environmental risk of hydraulic oil spills on deck. The IP67+ sealing handles the marine environment, and the helical gears keep the noise below the crew comfort limits for winches mounted near accommodation.

Automated Industrial Hoists

Servo-motor-driven overhead hoists in manufacturing, warehousing, and logistics centres where precise load positioning and automated cycle control are essential. The ZL30 DIN 5-6 accuracy preserves the motor encoder resolution through the gear reduction, enabling the PLC to command the hoist position to sub-millimetre accuracy. The 4-stage option at ratios 500-1,259 provides ultra-slow precision for final component placement in automated assembly lines.

Does the ZL30 share components with the ZL24 wheel drive?

The ZL30 and ZL24 share the same helical gear architecture, the same DIN 5-6 accuracy standard, the same housing material (QT600-3), and the same sealing philosophy (IP67+ FKM). However, the ZL30 is configured for winch drum integration (rotating housing with drum flanges) while the ZL24 is configured for wheel hub mounting (output flange rotation). The internal gear sets may share the same tooth counts at overlapping ratios, but the housing, output shaft, and seal arrangement are different. They are cousins, not twins.

Why is the ZL30 peak-to-continuous ratio 2.8:1 versus approximately 2.0:1 for the 4xxW series?

The ZL helical gear tooth profile distributes load across a wider contact band than the straight-cut gears in the 4xxW series. This wider contact area allows the tooth to carry higher transient loads before the bending stress reaches the fatigue endurance limit. Additionally, the 100,000-hour life rating of the ZL series is calculated at the continuous torque — the peak torque is explicitly rated for short-duration events (sub-10-second), which allows a higher peak-to-continuous spread than the FEM M5/M6 classification used for the 4xxW series (which includes the peak loading in the fatigue calculation).

How does the ZL30 handle load holding without an integrated brake?

Three methods, identical to the ZL wheel drive approach: (1) Motor-integrated electromagnetic brake — most PMSM and AC induction motors offer a factory brake option that acts on the motor shaft and is multiplied through the gear ratio. (2) Electronic braking via the VFD — motor short-circuit braking or active current braking holds the load through the motor controller. (3) External drum calliper brake for applications requiring a purely mechanical hold independent of the electrical system. For lifting applications, at least two independent braking methods are required by EN 14492 and equivalent standards.

Can the ZL30 winch drive be used with a hydraulic motor instead of an electric motor?

Technically yes — the input spline accepts any shaft that matches the mechanical interface. However, most hydraulic motors at the 27,000 Nm torque level operate at 1,500-3,000 rpm, which underutilises the ZL30 4,000 rpm input capability. The helical gears and DIN 5-6 accuracy, which cost more than straight-cut gears, provide no benefit with a hydraulic motor that does not use encoder feedback. For hydraulic drive at this torque level, the 4xxW series (407AW or 407W3) is the more cost-effective choice. Choose the ZL30 only when the motor is electric.

What noise level does the ZL30 produce compared to the 407W3 at the same torque?

The ZL30 helical gears produce approximately 8-12 dB(A) less noise than the 407W3 straight-cut gears at equivalent speed and torque. At 2,000 rpm input under full load, the ZL30 typically measures 65-70 dB(A) at 1 metre versus 76-82 dB(A) for the 407W3. On an electric crane with no engine noise, this difference is the primary audible characteristic of the hoist system. For cranes operating near hospitals, residential areas, or indoor environments, the ZL30 noise advantage is often the specification driver.

What is the ratio 1,259 at 4-stage used for in a winch application?

At ratio 1,259 with a 3,000 rpm motor: output = 2.4 rpm. On a 400 mm PCD drum: line speed = 3.0 m/min. This is ultra-precision territory — lowering a sensor package into a borehole, deploying a remotely operated vehicle (ROV) through a moon pool, or positioning a delicate instrument at the end of a cable where speed must be measured in millimetres per second. The 4-stage ratio range extends the ZL30 from conventional crane hoist duty all the way to laboratory-grade cable positioning — in one product family. Contact Coreia Ever-Power for 4-stage dimensional data at your specific ratio.

All-electric 20 t mobile crane, main hoist, ZL30 at ratio 65, paired with a 200 kW PMSM motor and VFD. The hoist noise reduction compared to our hydraulic baseline was exactly what the ZL30 data sheet predicted: 10 dB(A) lower at the operator station. Regen braking recovers 19% of the lowering energy to the battery — extending the crane battery range by approximately 12% over a typical construction day cycle. The 75,500 Nm peak handled every grab-release and snatch-load event during our 6-month field trial without any vibration anomaly or oil temperature excursion. We are standardising the ZL30 across the electric crane product line.

All-electric mooring winch on a hybrid-electric coastal ferry. ZL30 at ratio 120, 75 kW AC induction motor. The winch eliminated the hydraulic power unit that occupied 2.4 m² of engine room floor space and 180 kg of weight. The ZL30 plus motor total weight is 95 kg less than the previous hydraulic winch assembly. The IP67+ sealing has survived 14 months of salt water deck wash without any seal degradation. Mooring line snatch loads during berthing in crosswinds — measured at 2.3x steady-state — were absorbed within the ZL30 peak capacity without any audible or tactile indication of stress. The ferry operator is converting all 4 mooring winches to ZL30 during the next dry-dock.

Automated overhead hoist in a heavy-parts warehouse, ZL30 at ratio 400 (4-stage), 30 kW PMSM servo motor. The hoist positions 5-tonne engine blocks onto machining fixtures at 0.5 mm accuracy — measured by laser tracker, confirmed over 2,000 placement cycles. The DIN 5-6 gear accuracy preserves the motor encoder resolution through the 4-stage reduction, which is essential for our closed-loop position control. The 4-star is a dimensional observation: the 4-stage ZL30 is approximately 40 mm longer axially than the 2-stage at the same housing diameter, which required a minor drum housing modification on our existing hoist frame. Having the per-stage dimensional addition published in the catalogue data sheet would have caught this during the specification phase.