WPWDKS ウォームドライブ減速機 | 鋳鉄製ギアボックス

Cast Iron Worm Gear Speed Reducer Housing

The HT200 grey iron housing — a hallmark of every serious cast iron worm gear speed reducer — delivers structural stiffness without machining distortion. Wall thickness is calculated to keep deflection under 0.02 mm at rated torque, protecting gear mesh alignment over the full service life.

56–62 HRC Worm Surface — Handles Shock Loads

20CrMnTi carburized and oil-quenched worm hits 56–62 HRC surface hardness while keeping a tough core. This is what separates a true heavy duty worm drive gearbox from a commodity unit — the surface resists micro-pitting under load reversals that would score a through-hardened worm within months.

Universal IEC Flange Mounting

The WPWDKS qualifies as a universal worm gearbox precisely because it accepts IEC frame 56 through 80 on a single housing without adapters in most cases. Switchover from one motor size to another takes under 20 minutes on the bench.

Tin-Bronze Worm Wheel — Quieter, Longer Life

Copper-10-3# tin-bronze has a coefficient of friction against hardened steel of 0.03–0.06 under lubricated conditions. The result: operating noise on size 80 measures below 65 dB(A) at 1 m, and heat generation per unit of transmitted power drops compared to aluminium-bronze alternatives.

Double-Stage Cascading Available

Two WPWDKS units bolted in series multiply the effective ratio beyond 1:60 — without custom gearing. This is the approach preferred by worm gear reducer manufacturers supplying textile and chemical dosing lines where output shaft RPM may need to fall below 10 RPM at constant motor speed.

VFD Compatible — No Derating Below 30 Hz

The housing geometry provides sufficient oil-splash lubrication to the worm contact zone down to 30% of rated motor speed, making the WPWDKS a reliable partner for variable-frequency drive control without additional forced-lubrication hardware on sizes up to 135.

Requires consistent low-speed output with washdown-compatible sealing. KSK seals with optional stainless shaft extensions handle IP54 splash conditions.

Noise-sensitive environments benefit from the bronze-on-steel mesh geometry, which keeps acoustic output below 65 dB(A) at rated load on standard sizes.

Double-stage cascading achieves output speeds below 10 RPM for precise volumetric control without a separate gearmotor.

High-cycle, dusty environments need a sealed cast-iron body. HT200 housing maintains tolerance under thermal cycling from kiln proximity.

Fabric roll drives need repeatable low-speed torque. The 1:50 and 1:60 ratio options cover most dyeing-machine mandrel speeds without VFD fine-tuning.

Feed rolls and band-saw guides benefit from the worm’s natural self-locking tendency at ratios above 1:30 — a safety feature at no extra cost.

Q1: Is the WPWDKS Worm Drive Speed Reducer the same worm wheel reducer as the WPWDKA series?

Same center-distance sizing and ratio range, but the KS variant uses a different shaft output configuration optimized for direct-coupled loads. Check the dimensional drawings — shaft key and output bore dimensions differ between suffixes.

Q2: What’s the thermal limit of this cast iron worm gear speed reducer?

Maximum housing surface temperature is 80°C. At ambient 25°C, sizes ≤135 stay within this limit under continuous rated load. Size 155 and above may need a cooling fan on the motor or an oil cooler if ambient exceeds 35°C and duty cycle is >90%.

Q3: Can this heavy duty worm drive gearbox be mounted in any orientation?

Yes — foot, flange, and shaft-mount orientations are all supported. The oil fill plug position must be adjusted for each orientation per the supplied diagram to maintain correct oil level at the worm mesh contact point. Incorrect orientation filling is the leading cause of premature failure in field installations.

Q4: Do you stock spare worm wheels and worms separately?

Yes. Bronze worm wheels and hardened worms are held in stock for sizes 40–175. Lead time for size 200 and 250 spare sets is typically 7–10 working days. Specify the size code and ratio when ordering to ensure correct mesh geometry.

Q5: Which oil grade is recommended for a universal worm gearbox running at 1:60 ratio?

ISO VG 220 mineral or PAO synthetic for ambient 10–40°C. At high ratios the worm speed is low, reducing splash lubrication efficiency — switch to VG 320 if ambient exceeds 40°C or if the duty cycle is intermittent with long idle periods between runs.

Protective Packaging

Small units (≤60 kg) ship in double-wall export cartons. Larger sizes use wooden crates with internal foam blocking. Pallet stacking per customer request.

Factory QC Before Dispatch

Every reducer runs a no-load break-in cycle and passes noise & seal checks. A QC report is issued with each order of 5+ units.

Flexible Transport Mode

Air express for urgent small orders; LCL or FCL sea freight for volume. We match the mode to cargo weight and your required delivery window.

Arrival Inspection & After-Sales

Inspect goods on receipt and photograph any transit damage before signing. Damage claims are processed within 48 hours of notification with photo evidence.

“Fitted 6 units of WPWDKS 100 to our packaging conveyors. Eighteen months later, not one oil leak, not one bearing replacement. The dimensional accuracy across all 6 was within 0.3 mm on every bolt circle — that matters when you’re doing a batch installation.”

“I’ve been in machinery my whole career and this is genuinely the first gearbox I’ve ordered that arrived already filled with oil, already tested, and actually quiet. It’s almost suspicious. I keep waiting for something to go wrong, but it’s been 11 months. Still suspicious.”

“Ordered 20 units of size 135 for a ceramics plant retrofit. Delivery was 9 working days from order confirmation. One unit had a minor paint scratch on the housing — replacement was sent by DHL within 4 days. The gear mesh on all units was consistent and quiet at first start-up.”

Splined Shafts & Yokes

Precision-machined to ±0.02 mm spline pitch for vibration-free input connection.

IEC Motor Adapters

B5 and B14 adapter plates for IEC frames 56–132. Drop-in motor swaps with no machining.

ジョーカップリング

Rigid and flexible couplings for output-shaft-to-equipment connections. Spider elements in polyurethane or hytrel.

Agricultural Gearboxes & Mowers

Disc mower, spreader, and rotary tiller gearboxes for equipment running alongside worm reducers.

Ready to specify or order?

Send us the required size, ratio, motor frame, and quantity. In-stock sizes ship within 3 business days. Engineering selection support is included at no charge.