BWD Cyclo-reducerare – Horisontell fotmonterad växellåda

Produktöversikt

En cykloväxelreducerare is a type of speed reduction device that uses an eccentric bearing to drive a cycloidal disc, producing high torque output at reduced rotational speeds through rolling contact between the disc and a ring of pins. The BWD series represents the single-stage, horizontal foot-mounted configuration within this product family, and it is one of the most widely installed cykloidväxelreducerare types across Korean and East Asian manufacturing plants.

This unit serves as a direct replacement for Sumitomo CHHM and SM-Cyclo equivalent frame sizes. Customers ordering the BWD cyclo gear reducer can cross-reference their existing Sumitomo frame numbers to find a matching Ever-Power unit with identical shaft dimensions, mounting bolt patterns, and center heights. This cross-referencing is provided solely for customer convenience in selecting the correct replacement unit, and does not imply the sale of counterfeit goods or any affiliation with the referenced brand.

The BWD series covers frame sizes 09 through 18, with center heights ranging from 80 mm to 420 mm. Output shaft diameters span from 22 mm (Frame 09) up to 140 mm (Frame 18), and the housing is precision-machined cast iron for long-term dimensional stability. Input power ratings range from fractional kilowatt motors up to 55 kW, making this horizontal foot-mounted cycloid reducer suitable for light-duty packaging lines as well as heavy-duty aggregate conveyors. Industries that regularly specify this model include cement processing, wastewater treatment, food production, textile manufacturing, and port logistics across South Korea, Japan, and Southeast Asia. View all available models in the cykloväxelreducerare serie.

Every BWD unit ships with a standard oil-bath lubrication system, four-bolt foot mounting pads, and keyed input and output shafts machined to h6 tolerance. Optional configurations include a double output shaft variant, a flange-mount adapter kit, and custom RAL color painting for facility standardization.

Technical Specifications and Dimensional Data

The tables below present the complete installation and shaft-end dimensions for all BWD cycloidal speed reducer frame sizes. When selecting a frame, pay close attention to the center height (which determines alignment with your driven equipment), the output shaft diameter d1 and keyway width b1 (which must match your coupling or sprocket bore), and the mounting bolt hole spacing A1 and B1. All dimensions are in millimeters. Shaft tolerances are machined to h6 for the output side and js6 or k6 for specific configurations as noted in the second table.

Table 1: Appearance and Installation Dimensions (mm)

Obs: Matchande tolerans för axel d₁/d₂ är h6.

Configuration Drawing - Single Stage Horizontal Type

Table 2: BWD/BW Contour and Installation Dimensions (mm)

How a Cycloidal Speed Reducer Works

De BWD horizontal foot-mounted cyclo drive reducer operates on an eccentric input principle rather than conventional involute gear meshing. The motor-driven input shaft carries an eccentric bearing, which causes a cycloidal disc (sometimes called a cycloid gear) to orbit inside a fixed ring of pins mounted to the housing. As the disc orbits, its lobed profile maintains rolling contact with each pin in sequence. Because the disc has one fewer lobe than the ring has pins, each full revolution of the input shaft advances the disc by exactly one pin position relative to the housing.

This small angular advance per input revolution is what produces the high reduction ratio. For a disc with 20 lobes and a ring with 21 pins, the single-stage ratio is 1:20. The output shaft connects to the cycloidal disc through a set of output rollers fitted into holes on the disc, converting the disc's wobbling orbital motion into smooth concentric rotation. Because nearly half of the pins are in contact with the disc at any given moment (compared to only one or two teeth meshing in a spur gear train), the load is distributed across many contact points simultaneously. This results in significantly higher shock load capacity and a much longer fatigue life for the internal components.

The BWD housing also incorporates a two-stage sealing system at both shaft exits: an inner oil seal retains lubricant, and an outer dust lip prevents abrasive particles from entering the bearing area. For the horizontal foot-mounted configuration, lubrication is handled by an oil bath, with the oil level visible through a sight glass on the housing side. The breather cap on top equalizes internal pressure during temperature changes. When the output connects to a chain-driven conveyor, matching kedjehjul och kedjor must be sized to handle the reducer output torque.

Cyclo Gear Reducer vs Worm Gear Reducer: An Engineering Comparison

Both cycloidal and worm gear reducers can deliver high reduction ratios in a single stage. However, their internal mechanisms produce very different performance characteristics. A snäckväxelreducerare transmits power through sliding contact between a helical worm screw and a bronze wheel, while a horizontal foot-mounted cykloväxelreducerare like the BWD uses rolling contact between a cycloidal disc and hardened steel pins. This fundamental difference in contact mechanics drives most of the performance gaps outlined below.

The efficiency difference is the most consequential factor for facilities running drives around the clock. A worm reducer operating at a 1:60 ratio typically achieves around 55-65% efficiency, meaning 35-45% of motor energy converts to heat rather than useful output torque. The same 1:60 ratio in a cycloidal unit runs at roughly 87% efficiency, reducing wasted energy by more than half. Over a three-year period on a 15 kW motor running two shifts per day, this efficiency gap translates to meaningful electricity cost savings, often enough to offset the initial price difference between the two reducer types.

The one area where worm reducers hold a clear advantage is self-locking. At ratios above approximately 1:30, a worm set cannot be backdriven through the output shaft, which provides a built-in holding function for vertical lifting applications. A cykloidal pinnhjulsreducerare does not self-lock and will require a separate brake or holding device if the load must remain stationary when power is removed. For horizontal conveyor drives, crane travel mechanisms, and mixer agitators where self-locking is not required, the cycloidal option delivers better efficiency and longer service intervals. For applications that need both high ratio and positioning accuracy, a planetväxellåda may also be worth evaluating.

Selection and Sizing Guide for BWD Cyclo Reducers

Selecting the correct BWD cyclo gear reducer frame size requires four primary parameters from the application. Gathering these before contacting our engineering team will speed up the quotation process and reduce the risk of mis-sizing.

1. Required output torque (N.m) or the load weight and radius for lifting/conveying applications
2. Required output speed (rpm) or the desired reduction ratio
3. Motor power (kW) and motor speed (typically 1500 rpm 4-pole or 960 rpm 6-pole in Korea)
4. Mounting orientation: horizontal foot, vertical flange, or double-shaft through-drive

Torque Calculation Method

The basic output torque formula for any speed reducer is: T_ut = (P x 9550 xix η) / n_i, where P is motor power in kW, i is the reduction ratio, η is the efficiency (use 0.87 for single-stage cyclo), and n_i is motor input speed in rpm. For example, a 7.5 kW motor at 1500 rpm driving a BWD frame with a 1:43 ratio produces approximately: (7.5 x 9550 x 43 x 0.87) / 1500 = 1,785 N.m at the output shaft.

Environmental and Installation Considerations

Beyond torque and speed, also confirm: the ambient temperature range (standard lubricant suits -10 to +40 degrees Celsius; extreme temperatures require special oil grades), whether the unit operates continuously or in start-stop cycles (service factor adjustment), the presence of corrosive or dusty atmospheres (optional enhanced sealing or surface coating), and the maximum allowable radial and axial loads on the output shaft (if coupling or sprocket loads are significant, an outboard bearing support may be needed). If your application requires self-locking capability, a snäckväxelreducerare may be a better fit for that specific requirement. For applications above 18.5 kW input power, we recommend matching the BWD with a 6-pole 960 rpm motor rather than a 4-pole 1500 rpm motor to reduce internal bearing loads and extend the maintenance interval. The product category page includes ratio selection charts for each frame size.

Core Performance Advantages of the BWD Horizontal Foot-Mounted Cyclo Gear Reducer

Relaterade och kompatibla produkter

De BWD cyclo gear reducer is one component in a complete power transmission chain. Depending on your application, you may need some of the following complementary products. Korea Ever-Power supplies all of these either from stock or on short lead times, and our engineering team can help you specify the complete drive package.

Power input components: Electric motors (IEC standard frame, three-phase induction) and flexible jaw couplings or pin-and-bush couplings for vibration isolation between the motor and reducer input shaft.

Output-side components: Drive shafts and universal joints for transmitting torque to offset or angular loads, particularly in heavy-duty mixer and kiln applications.

Chain transmission: Sprockets and chains for applications where the reducer output connects to a chain-driven conveyor or bucket elevator.

Combined transmission packages: For applications needing very high reduction ratios (above 1:87), the BWD can be connected in series with a planetary gearbox as a pre-stage or post-stage unit. It can also be paired with a worm gear reducer for applications requiring both high ratio and self-locking capability. Contact us for combined drive arrangement drawings.

Vanliga frågor

What reduction ratios are available for the BWD horizontal foot-mounted cyclo gear reducer?

The BWD series offers single-stage ratios from 1:9 to 1:87. For ratios above 1:87, a double-stage BWED model or a BWD combined with an external pre-reduction stage can reach ratios up to 1:7,569.

Is a cyclo reducer more efficient than a worm gearbox for conveyor applications?

Yes. At a typical conveyor ratio of 1:30 to 1:50, a cycloidal unit operates at approximately 87% efficiency, while a worm set at the same ratio typically drops to 60-70%. This difference directly reduces your electricity costs and motor heat buildup.

What lubricant should I use for the BWD series?

Standard operating temperatures call for 40# or 50# mechanical oil. For improved wear protection and longer drain intervals, 70# or 90# extreme-pressure gear oil is recommended. Change oil after the first 100 hours of operation, then every 6 months (based on an 8-hour daily work cycle).

Can the BWD handle shock loads from crusher or vibrating screen applications?

The multi-tooth engagement of the cycloidal disc allows momentary peak loads up to 500% of rated torque without damage. For continuous heavy shock duty, select one frame size above the torque calculation result to provide additional safety margin.

What is the maximum tilt angle for horizontal mounting?

The BWD foot-mounted unit should be installed within 15 degrees of horizontal. Beyond that angle, oil-bath lubrication may not reach all bearings properly, and a circulating oil system or alternative lubrication arrangement becomes necessary.

How long does a cycloidal speed reducer typically last in continuous industrial service?

With proper lubrication and within rated load conditions, the internal components of a BWD cyclo reducer have an expected service life of 10 to 20 years. The bearings are typically the first component to require replacement, and they can be changed without scrapping the housing or cycloidal disc.

Can the BWD be paired with a drive shaft for angular connections?

Yes. For applications where the output needs to transmit torque at an angle, the BWD output shaft connects through a drivaxel and universal joint assembly. This is common in mixer, kiln, and conveyor transfer applications.

Does Korea Ever-Power offer OEM labeling or custom shaft configurations?

Yes. We offer custom output shaft diameters, keyway modifications, special flange patterns, non-standard RAL paint colors, and OEM nameplates. Minimum order quantities for custom configurations are typically low, and lead times range from 2 to 4 weeks depending on the modification scope.

Kundrecensioner

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Park Joon-seo, Maintenance Supervisor, Incheon Steel Processing (January 2025)

"We replaced four Sumitomo SM-Cyclo units on our coil cut-to-length line with Ever-Power BWD Frame 15 reducers. The shaft dimensions were identical, so the swap took less than a day per unit. After eight months of two-shift operation, zero issues. Oil stays clean, no temperature spikes. The cost saving compared to buying original Sumitomo replacements was around 40%."

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Tanaka Hiroshi, Engineering Manager, Osaka Packaging Co. (March 2025)

"Good build quality on the BWD-12 units we ordered. Noise is noticeably lower than the old worm gearboxes they replaced. Delivery to Osaka port took 9 days from order confirmation."

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Lee Soo-yeon, Plant Director, Gyeongnam Chemical (December 2024)

"We needed BWD-17 with a non-standard 110mm output shaft for our reactor agitator drive. Ever-Power custom-machined the shaft and delivered within 3 weeks. The unit has been running continuously at about 85% load for four months now. Temperature stays stable at around 55 degrees C ambient, which is exactly where we expected it. Their technical team was responsive and provided the correct coupling specification on the first attempt."

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Nguyen Van Thanh, Procurement Officer, Ho Chi Minh City Cement (February 2025)

"Price was very competitive. We bought 12 units of BWD-13 and BWD-14 for our bucket elevator drives. Packaging was solid, arrived in perfect condition. One minor issue with a missing breather cap on one unit, but they sent the replacement part express at no charge."

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Kim Hye-won, Facility Engineer, Chungbuk Food Processing (October 2024)

"Switched from worm reducers to BWD cyclo units on two conveyor lines. The energy meter readings dropped by about 22% on those lines. That alone justifies the purchase. We will convert the remaining four lines next quarter. Already browsing cykloväxelreducer.topp for the next batch."

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Sato Kenji, Technical Buyer, Nagoya Textile Mill (November 2024)

"Ordered BWD-10 and BWD-11 for our yarn winding machines. Smooth and quiet operation. The vibration level is well within our spec limit. We appreciated the Korean warehouse option, which cut lead time to just 5 days."

Varför välja Korea Ever-Power

• Over 20 years of manufacturing experience in power transmission equipment
• ISO 9001 certified production system with full traceability of raw materials
• CE-märkta produkter för internationell överensstämmelse
• Direct factory pricing with no trading intermediaries
• Dedicated engineering team for selection support, torque calculations, and drive system design
• Korean domestic warehouse for commonly ordered frame sizes, enabling same-week dispatch
• OEM and ODM services with low minimum order quantities
• Complete transmission solutions: cyclo reducers, motors, couplings, chains, sprockets, and drive shafts from a single supplier

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