Standard Right-Angle Planetary Gearbox for General Industry — WPL Series (WPL40–WPL120)

The WPL series standard right-angle planetary gearbox delivers 90-degree power transmission for general industrial applications where perpendicular motor-to-load axis arrangement is dictated by machine layout, but where the efficiency, backlash, and cost premium of the WPLE/WPLF precision series is not warranted. Four frame sizes from WPL40 through WPL120 cover motor compatibility from 50 W to 4,000 W with gear ratios spanning 3:1 to 512:1 through single, two-stage, and three-stage configurations — the widest ratio range in our right-angle product family, matching the PL series standard inline range.

Where WPLE/WPLF targets servo motor positioning with ≤4 arcmin backlash and efficiency up to 97%, WPL series serves the wider industrial market where conveyor drives, packaging machinery, and material handling equipment require reliable 90-degree torque transmission across millions of duty cycles at the lowest possible unit cost. Sealed lifetime lubrication eliminates the quarterly oil-change intervals that keep maintenance teams busy on conventional worm gearboxes operating in the same applications.

Roller Shutter & Gate Drives

Industrial roller shutters and security gate actuators use WPL three-stage (100:1–256:1) for very slow, controlled gate movement at high holding torque. WPL40 and WPL60 cover the 50–750 W motor range for gates up to 200 kg panel weight. Note: an external mechanical brake or worm pre-stage is required for power-failure holding on vertical gates.

Mixing & Agitator Drives

Tank agitators and mixing vessels often mount the motor above the tank with the impeller shaft running vertically through the lid — a natural right-angle drive application. WPL series IP54 housing handles splash and vapour from mixing operations. WPL80 and WPL120 cover industrial mixing motors 300–4,000 W.

Architectural Shading & BIPV

Building-integrated photovoltaic panel tilt systems and motorised façade louvres require slow, precise angle control at 0.5–5 rpm output — a natural three-stage WPL40 application at 256:1–512:1 ratio with 50–100 W motors. Sealed grease eliminates maintenance access requirements on inaccessible façade installations.

Cost-optimised unit pricing does not mean reduced quality controls. WPL series goes through the same bevel contact pattern verification and IP54 ingress testing protocol as our precision right-angle series — the testing cost is the same regardless of product grade.

Factory Acceptance Tests — Every Unit

• ✔ Bevel contact pattern check under load
• ✔ Full-load torque test at 110% rated
• ✔ IP54 ingress test — pressure differential
• ✔ Output shaft runout ≤0.03 mm
• ✔ Noise check at rated speed

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→ Conveyor CV Drive Shafts

When the WPL output flange cannot be positioned directly adjacent to the conveyor head drum — common in long-centre conveyor systems with thermal expansion or structural deflection — CV drive shafts transmit torque with full angular and axial compensation without loading the gearbox output bearing.

• ▸ Angular misalignment ±8°
• ▸ Torque to 2,500 N·m

→ Worm Gearbox (Self-Locking)

For applications where WPL does not provide the inherent back-drive prevention needed — vertical gate drives, inclined conveyor load-holding, or carton-drop vertical axes — a worm stage provides self-locking capability where WPL provides efficiency and torque density for the primary reduction stages upstream.

• ▸ Self-locking at ratios ≥40:1
• ▸ Combined system ratios to 50,000:1

→ Agricultural Bevel Gearboxes

For outdoor agricultural conveying, spread-rate drives, and field equipment where WPL provides the speed reduction and the bevel stage provides multi-output splitting at PTO-compatible shaft interfaces for direct tractor coupling.

• ▸ PTO-compatible input flanges
• ▸ IP67 for continuous field operation

We switched from worm gearboxes to WPL80 across 38 conveyor head drives in our automotive parts factory. Oil change interval eliminated — that was 76 oil changes per year across the facility. Energy bills dropped about 8% on those conveyors. At 22 months operation, zero gearbox-related stoppages. The any-angle mounting meant we could reuse the existing motor mounting frames without modification.

WPL60 on a horizontal form-fill-seal machine — 6 axes. The sealed grease was mandatory for our food contact zone approval. Previous worm reducers required oil analysis every 6 months; WPL eliminated that entirely. We've now standardised the entire WPL range across 4 machine models. The WPL ↔ WPLF interchangeable housing saved us significantly on prototype fixture tooling.

WPL40 three-stage (256:1) for architectural louvre drives in a commercial building. The 256:1 ratio lets us use standard 70W single-phase motors without a VFD — direct-on-line switching with the louvre moving at 0.7 rpm. Simple, reliable, and no drive electronics to fail in a rooftop installation. 3 years operation. Minor note: IEC motor adapter drawing could be clearer on the pilot bore tolerance for non-standard motor frames.

WPL120 for scissor lift tables in our EV battery assembly facility. The 90° arrangement kept the motor in the horizontal position beneath the table for easy access, while the output shaft drove the vertical screw directly. 18 months of 3-shift assembly production, zero gearbox issues. We also tested one WPL120 upgraded to WPLF120 during the trial — the mounting was a perfect swap, confirmed the interchangeability claim.

QWhat is the key difference between WPL and WPLE/WPLF series?

WPL is optimised for general industrial applications where cost is a primary criterion and servo-class backlash precision is not required — conveyor drives, lift tables, packaging machinery. WPLE/WPLF targets servo motor integration with ≤4 arcmin backlash and efficiency up to 97% for positioning applications such as AGV steering, solar trackers, and precision rotary indexing. Both series share identical housing dimensions, so WPL units can be replaced with WPLF if application requirements change without redesigning the machine mounting.

QWhy does WPL reach 512:1 when WPLE/WPLF maximum is also 512:1 but WPL goes to three stages?

Both series support up to 512:1 through multi-stage configurations. The difference is the efficiency and cost profile at each stage count. WPL three-stage (85%+ efficiency) is cost-optimised for general industrial low-speed drives where the energy cost difference from WPLF's higher efficiency is not justified by the application duty cycle. WPLF three-stage adds the precision backlash specification that WPL does not offer — relevant only when the application uses closed-loop position control.

QCan WPL hold a vertical load without an external brake?

No. WPL bevel-planetary design is not inherently self-locking. For gravity-loaded vertical axes — scissor lifts, gate drives, vertical feed axes — an external spring-set mechanical brake is required for fail-safe load holding on power failure. The motor holding torque alone is not a reliable substitute. If self-locking is essential and an external brake is impractical, a worm gearbox stage should be cascaded downstream, or the application should be re-evaluated for WPLF with a brake.

QDoes WPL require a specific mounting orientation for the sealed grease lubrication to work correctly?

No — any mounting orientation is fully supported. The sealed grease fill does not pool under gravity the way oil-bath worm gearboxes do. There are no oil-level windows to monitor, no drain plugs to position downward, and no orientation-dependent lubrication starvation risk. This eliminates a machine layout constraint that conventional worm gearboxes impose and allows the motor and gearbox to be oriented to best suit machine access and maintenance requirements.

QWhat is the efficiency difference between WPL single, two, and three-stage configurations?

Each planetary stage contributes approximately 2–3% efficiency loss. Single-stage WPL: ≥90%. Two-stage: ≥87%. Three-stage: ≥85%. In energy cost terms for a 750 W motor running 6,000 hours/year, the difference between single and three-stage is approximately €27/year at €0.15/kWh — generally insignificant compared to the BOM cost saving from eliminating a VFD for slow-speed operation. If efficiency above 90% is a design requirement at any ratio, specify WPLF series which achieves 94–97% across all configurations.

QCan I use WPL with a VFD (variable frequency drive)?

Yes, WPL series is fully VFD compatible. When operating at low VFD frequencies (below 25 Hz), reduce continuous torque to account for reduced motor cooling — typically derate to 70% of rated torque below 20 Hz. Do not exceed the gearbox rated input speed regardless of VFD frequency setting. One practical advantage of the three-stage 512:1 WPL configuration is specifically that it eliminates VFD underfrequency operation for very low output speeds — a direct cost saving by enabling standard DOL motor control instead of VFD investment.