WPEX 2段式ウォームギア減速機 | 2段駆動

One Housing for Two Stages

Both worm reduction stages share one cast housing — no intermediate coupling, shorter drive train, simpler mounting compared to two separate ウォームギア減速機 in series.

Low Noise Below 50 dB(A)

Worm mesh noise is lower than equivalent helical or spur stages. The WPEX cast iron housing provides additional vibration damping at both mesh frequencies — relevant in textile, food, and stage machinery environments.

Double Self-Locking

At high ratios where both stages are ≥ 20:1, both worm pairs independently self-lock. The strongest static hold of any WP-series ウォームギア減速機 configuration — back-drive must overcome two self-locking meshes simultaneously.

Single Oil Service Point

Both stages share one oil sump — one fill port, one drain, one change interval. Versus two separate units: half the oil service events, no intermediate shaft coupling to grease, simpler preventive maintenance schedule.

What typical output speed range is the WPEX used for in practice?

Published range is 25–300 rpm. In practice the WPEX ウォームギア減速機 is most commonly specified at the lower end — 2–25 rpm — where a single-stage WP cannot achieve the needed speed from a standard motor. At 300 rpm output the total ratio is only 5:1, which a single-stage unit handles easily.

Is the WPEX less efficient than a single-stage worm gear reducer at the same ratio?

Yes. Two mesh efficiency losses multiply together. If each stage is 75% efficient, combined efficiency is 56%. Motor sizing must account for this — a 100 W output load requires approximately 180 W motor input through the WPEX versus ~133 W for a single-stage ウォームギア減速機 at the same output. The motor size increase is accepted in exchange for the much higher reduction ratio in one unit.

Can the WPEX worm gear reducer be used with a VFD for variable speed?

Yes. VFD-driven motor into WPEX is common in textile and chemical equipment for variable slow drives. Confirm motor thermal rating at reduced VFD frequencies — below 25 Hz a separately-powered cooling fan is typically needed for continuous duty. Apply a service factor of 1.2–1.3 to the torque requirement when specifying this double stage ウォームギア減速機 with VFD operation.

How do I read the WPEX frame code?

Written as two numbers: WPEX[Stage1]/[Stage2]. Stage 1 (input side) is always the larger frame. Example: WPEX130/90 = 130 mm primary stage reducing into 90 mm secondary stage. Provide both the frame code and the individual ratio of each stage when ordering this double stage ウォームギア減速機.

Is the double self-locking feature reliable for safety-critical load-hold?

Double self-locking (both stages ≥ 20:1) is stronger than single-stage self-locking — a back-drive attempt must overcome the friction of two independent worm meshes. However for safety-critical hold applications such as elevated loads or machinery over personnel, verify experimentally at your maximum operating temperature and load. Do not rely solely on theoretical self-locking in safety-critical designs.

What is the recommended oil change interval for the WPEX?

Change oil at 100 hours (first service — run-in flush). Then every 2,000–3,000 hours or 12 months in continuous service. The unified oil sump serves both stages — one oil change covers the complete ウォームギア減速機. Maximum oil sump temperature: 95°C. If temperature rises continuously above this, stop and investigate overloading, blocked vent, or incorrect oil grade.

Why choose WPEX over a helical-bevel gearbox at the same high ratio?

WPEX advantages over helical-bevel at very high ratios: lower cost, simpler housing (no bevel gear pair), lower noise at the slow output speeds typical of WPEX applications, and built-in self-locking eliminating the holding brake. Helical-bevel is more efficient — the efficiency penalty of the WPEX double worm stage is only meaningful where energy cost is a primary selection criterion. For most slow-speed industrial drives in textile, glass, and chemical applications, the WPEX ウォームギア減速機 is more cost-effective.

"Used WPEX90/50 for our glass lehr roller drive. Needed 2.8 rpm output from 1,500 rpm motor — impossible in single stage. The double stage worm gear reducer handles it perfectly and the double self-locking means the roller train holds when the motor stops. Running 20 months without issue."

Park Chae-wonPlant Engineer, Busan Glass Products Co.

"WPEX130/90 on a stenter frame main drive. Single housing saved 320 mm drive length versus two separate reducers in series. One oil change covers both stages. This worm gear reducer simplified our maintenance schedule significantly."

Lee Dong-junMaintenance Engineer, Daegu Textile Machinery Plant

"Replaced a helical-bevel unit with WPEX70/50 on a chemical mixer shaft. Lower cost, shorter lead time, and quieter than the bevel gearbox at our 8 rpm drive speed. The double stage worm gear reducer runs cooler than expected — good heat dissipation from the cast housing."

Kim Young-juProcess Engineer, Incheon Chemical Processing Co.

"WPEX110/70 on a ceramic kiln car drive — 5 rpm output, 450 N·m. Double self-locking holds the car position on the inclined kiln entrance ramp when the motor stops between cycles. The worm gear reducer has been running two-shift, 350 days per year for 26 months without any unplanned stop."

Oh Seung-binEquipment Manager, Gyeongnam Ceramics Manufacturing

"Required 3.2 rpm on a sludge paddle drive for a wastewater treatment station. VFD + WPEX90/50 at 466:1 total — clean, low noise, self-locking position hold between cycles. Previously we used a chain reduction stage plus single-stage worm gear reducer, which needed quarterly chain lubrication. The WPEX eliminated that maintenance entirely."

Jung Ha-eunUtilities Engineer, Daejeon Municipal Water Treatment

"Lead time was 8 days for a WPEX frame we had not used before. Korea Ever-Power sent dimensional drawings before order confirmation so we could verify mechanical fit. The double stage worm gear reducer arrived correctly sized and we had it running within 4 hours of delivery. Excellent technical support throughout."

Yoon Jae-youngProject Engineer, Seoul Industrial Machinery Co.