Standard Economical Planetary Gearbox for General Industry — PL Series (PL40–PL160)

The PL series standard planetary gearbox fills the widest band of industrial transmission requirements — applications that need reliable torque multiplication across millions of operating cycles, consistent ratio accuracy, and sealed low-maintenance operation, but do not demand the ultra-low backlash of precision servo systems. Six frame sizes from PL40 through PL160 deliver output torque from 4.5 N·m to 800 N·m, covering servo, stepper, and induction motor outputs from 50 W to 6,000 W without requiring intermediate coupling stages or custom adapters.

Where PLE/PLF precision-grade reducers prioritise backlash below 4 arcminutes for servo positioning, and PF high-torque units target sustained heavy-load mining drives, PL series is optimised for the cost-sensitive industrial middle ground: printing lines, food conveyors, textile machinery, and automated handling systems where 10–20 arcmin backlash is entirely adequate and purchase price directly affects machine BOM competitiveness.

Automated Storage & Retrieval

Stacker crane travel and lift drives in ASRS warehouses run 20+ hours per day over 10-year equipment lifecycles. PL series 30,000-hour sealed service life eliminates the gearbox replacement intervals that force ASRS shutdowns in conventional open-sump unit installations.

Packaging & Labelling Machinery

Rotary labelling head drives and carton erection servo systems specify PL80 and PL100 in applications where consistent torque at moderate speed determines throughput rate. Sealed grease prevents product contamination from lubricant spray common in high-speed packaging environments.

Woodworking & Panel Saws

Automated panel-saw feed drives and horizontal band-saw table drives generate wood dust and chip contamination that shortens conventional open-housing reducer life. PL series IP54 sealed housing blocks sawdust ingress, making PL100–PL160 the standard choice for woodworking automation.

ISO 9001:2015 applies to the full manufacturing process — from gear blank procurement through final shipping inspection. Cost-optimised pricing does not mean reduced quality controls; PL series goes through the same inspection protocol as our precision and heavy-duty lines.

Factory Acceptance Tests — Every Unit

• ✔ Backlash measurement — output shaft to input rotation
• ✔ Full-load torque test at 110% rated — 15 min sustained
• ✔ IP54 ingress test — pressure differential method
• ✔ Output shaft runout ≤ 0.03 mm
• ✔ Noise check at rated speed — anomalous units quarantined

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→ CV Joint Drive Shafts

When the driven shaft axis cannot be held in rigid alignment with the PL output flange — typical of conveyor drives with frame flex, heated ovens with thermal expansion, or suspended belt drives — CV drive shafts absorb misalignment without generating bending forces in the PL output bearing.

• ▸ Angular misalignment ±8°
• ▸ Full-float axial compensation
• ▸ Torque range to 2,500 N·m

→ Worm Gearbox (Right-Angle & Self-Locking)

Where the driven axis requires a 90-degree output direction or inherent back-drive prevention — dancer roll tension control, inclined conveyor holding, or actuator gate drives — a worm gearbox stage downstream of PL series combines self-locking capability with the wide ratio range of the planetary pre-stage.

• ▸ Self-locking at ratios ≥40:1
• ▸ Combined ratios to 10,000:1 possible

→ Agricultural & Food-Grade Gearboxes

Food processing conveyor systems and agricultural bulk-handling equipment often require multi-output right-angle drives downstream of the main PL reducer. Food-grade bevel gearboxes with NSF-approved lubricants connect PL series output to multi-shaft take-off configurations in food-contact zones.

• ▸ NSF H1 food-grade lubricant options
• ▸ IP67 for CIP wash-down zones

We standardised our 8 conveyor machine models on PL80 and PL100. Across 240 units in the field over 3 years, two units returned — both due to installation errors, not product failure. The consistent dimensions across frames made our mechanical design engineering much simpler. Will continue as our standard specification.

Used PL60 on our yarn winding machines for 2 years — 180 units across our customer base. The sealed grease design is critical in a textile fibre environment; the previous open-sump reducers we used required cleaning every 3 months and had lint contamination failures. Zero contamination incidents since switching to PL series.

PL40 units on desktop CNC laser engravers — the 10,000 rpm input speed allows our 6,000 rpm DC servo motor to run at rated speed without derating. Very compact at 40 mm frame, fits our column structure with minimal clearance. Minor comment: the motor adapter plate tolerance on the pilot bore was on the wide side of spec — not a problem in practice, but worth noting for high-concentricity applications.

PL120 units on our ASRS stacker crane travel drives — 8-hour continuous operation, 6 days a week. 4 years without a single gearbox failure across 18 cranes. The sealed design means our maintenance team does not touch them — which is exactly what we needed for an unattended night-shift warehouse. Price-to-reliability ratio is excellent.

QHow does PL series backlash compare to PLE/PLF, and when does the difference matter?

PL series delivers ≤10 arcmin single-stage backlash — adequate for conveyor drives, textile machinery, printing press auxiliaries, and general automation where positioning tolerance is measured in millimetres, not micrometres. PLE/PLF precision-grade achieves ≤4 arcmin for servo robotics and CNC machines where backlash directly degrades part accuracy. If your application does not involve closed-loop servo positioning with tight tolerance requirements, PL series is the right choice and avoids paying for precision you will not use.

QWhy does PL40 have a 10,000 rpm input limit when larger frames are limited to 6,000 rpm?

Input speed limits are governed by centrifugal forces on the planet gear bearings and the planet carrier dynamic balance. The smaller PL40 frame uses smaller, lighter planet gears that can sustain higher centrifugal loading at elevated rpm without exceeding bearing DN limits. Larger frames use heavier planet assemblies where the same rpm would generate unsustainable bearing load — hence the 6,000 rpm limit that applies to PL60 through PL160. This makes PL40 uniquely suited for small high-speed motors that run at 4,000–8,000 rpm, a pairing where larger frames are unsuitable.

QCan I upgrade from PL to PLE without changing the machine design?

Yes — PL and PLE/PLF series share identical external housing dimensions, flange bolt patterns, and input adapter plate configurations across equivalent frame sizes. Swap the gearbox without changing drawings, test fixtures, or motor mounting. Note: after upgrading to PLE precision grade, your servo drive's position-loop gain may benefit from upward tuning to exploit the tighter backlash — most modern servo drives handle this via a single parameter adjustment.

QDoes the IP54 protection class cover high-pressure jet washing during CIP cycles?

IP54 covers splashing from any direction but not sustained water jet pressure above low-pressure spray levels. For CIP (clean-in-place) washing with high-pressure nozzles, or food plant hose-down cycles, specify the IP65 option which adds resistance to directed water jets from any angle. IP65 is available on request for all PL frame sizes at a minor price premium.

QWhat is the maximum continuous torque I can use without reducing service life?

The rated torque figures in the model comparison table represent the 30,000-hour design life load. Operating continuously at 100% rated torque achieves this full life. To extend life beyond 30,000 hours, operate at 70–80% of rated torque — this reduces Hertz contact stress on gear flanks and extends L10 bearing life non-linearly. Occasional peaks up to 150% of rated torque (not sustained) are tolerated by the gear geometry without damage.

QAre non-standard ratios available, and what is the lead time?

Yes. Non-standard ratios between 3:1 and 512:1 are engineered for OEM accounts with minimum order quantities of 20 units. Lead time for non-standard ratios is typically 3–4 weeks. For the most common OEM ratios — 5:1, 10:1, 20:1, 30:1, 50:1, 100:1 — PL80 and PL100 frames are maintained in stock and ship within 3–5 business days. Provide your motor model number, required output speed, and application duty cycle for a detailed selection recommendation.