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The UDL/UD Mechanical Speed Variator is a planetary cone-disk stepless speed drive that adjusts output speed mechanically through a handwheel, without gears shifting or electrical control. Seven frame sizes cover rated power from 0.18 kW to 7.5 kW, output speed from 1000 to 200 rpm, and output torque from 1.5 N.m to 118 N.m. The speed ratio is continuously adjustable from 1:1.4 to 1:7. Speed regulation precision reaches 0.5-1 rpm, with repeatability of ±0.5% at maximum speed and ±0.1% at minimum speed.
The die-cast aluminum alloy housing and 20Cr case-hardened shafts (surface hardness above HRC60) deliver silent, vibration-free running in continuous bidirectional duty. The hollow shaft input with IEC-normalized motor flange accepts standard motors directly. OEM customization covers ratio range, shaft dimensions, flange type and mounting configuration. ISO 9001 certified manufacturer in Ningbo, China.
The UDL/UD Mechanical Speed Variator is a planetary cone-disk stepless speed drive that changes output speed through a mechanical adjustment rather than through electrical control or gear shifting. The working principle is straightforward: a set of conical disks mounted on a rotating carrier contacts a pair of rings. When the speed control handwheel moves the rings along the conical surfaces, the effective contact radius changes. Because the contact radius can be set to any value within the design range, the output speed can be adjusted continuously from 200 rpm to 1000 rpm without discrete steps.[reference:0]
The die-cast aluminum alloy housing holds the planetary cone-disk assembly rigidly while keeping the unit light enough to mount on the driven machine. The 20Cr case-hardened and tempered shafts are ground to a surface hardness above HRC60, and the internal contact components are made from 100Cr6 heat-treated steel.[reference:1]This combination is what allows the variator to run in continuous bidirectional duty without the vibration and noise that would occur if the contact surfaces were softer or less precisely finished.
The hollow shaft input with IEC-normalized motor flange is the standard configuration. An IEC B5 flange motor mounts directly to the variator input without an adapter plate or coupling. Input flange dimensions are available for 63B5, 71B5, 80B5, 90B5, 100/112B5 and 132B5 motor frame sizes, covering the full 0.18-7.5 kW range.[reference:2]
The table below lists the standard specifications for all seven UDL/UD Series frame sizes. Input speed reference is 1400 rpm. For a replacement or OEM application, confirm the required output torque, output speed and mounting interface against the machine drawing before ordering.
| Model | Rated Power | Speed Ratio | Output Speed | Output Torque | Output Shaft Dia. | Output Flange Dia. |
|---|---|---|---|---|---|---|
| UDL002 | 0.18 kW | 1.6 – 8.2 | 880 – 170 rpm | 1.5 – 3 N.m | Φ11 mm | Φ140 mm |
| UDL005 | 0.25 – 0.37 kW | 1.4 – 7 | 1000 – 200 rpm | 2.2 – 6 N.m | Φ14 mm | Φ160 mm |
| UDL010 | 0.55 – 0.75 kW | 1.4 – 7 | 1000 – 200 rpm | 4 – 12 N.m | Φ19 mm | Φ200 mm |
| UDL571 | 1.1 – 1.5 kW | 1.4 – 7 | 1000 – 200 rpm | 9 – 24 N.m | Φ24 mm | Φ200 mm |
| UDT020 | 2.2 kW | 1.4 – 7 | 1000 – 200 rpm | 18 – 36 N.m | Φ28 mm | Φ250 mm |
| UDT030 | 3.0 kW | 1.4 – 7 | 1000 – 200 rpm | 24 – 48 N.m | Φ28 mm | Φ250 mm |
| UD050 | 4.0 – 7.5 kW | 1.4 – 7 | 1000 – 200 rpm | 32 – 118 N.m | Φ38 mm | Φ300 mm |
| Parameter | Specification |
|---|---|
| Variator Type | Planetary cone-disk stepless speed variator |
| Housing Material | Die-cast aluminum alloy |
| Shaft Material | 20Cr case-hardened and tempered, ground >HRC60 |
| Internal Contact Material | 100Cr6 heat-treated steel |
| Speed Regulation Precision | 0.5 – 1 rpm |
| Speed Repeatability at Max | ±0.5% |
| Speed Repeatability at Min | ±0.1% |
| Rotation | Bidirectional, continuous duty |
| Speed Control | Handwheel, manual adjustment, either side |
| Input Configuration | Hollow shaft with IEC-normalized motor flange |
| Input Flange Range | 63B5, 71B5, 80B5, 90B5, 100/112B5, 132B5 |
| Mounting | B3 foot mounted / B5 flange mounted |
| Sealing | Fully sealed, suitable for dusty and humid environments |
| Customization | Ratio range, shaft dimensions, flange type, mounting configuration |
| Certification | ISO 9001 |
Five design characteristics separate the UDL/UD Series from a commodity speed variator. Each one is measurable in field service.
The planetary cone-disk mechanism provides continuous speed adjustment across the full 1:1.4 to 1:7 range. Unlike a geared transmission, there are no discrete speed steps and no interruption in torque transmission during adjustment. This is critical in processes where the correct speed is found by adjusting the drive while the machine is running, such as conveyor speed matching or packaging line synchronization.
Speed repeatability is ±0.5% at maximum speed and ±0.1% at minimum speed. When the handwheel is returned to a previously marked position, the output speed repeats within these tolerances. For a process that requires the same speed setting at the start of every shift, this eliminates the guesswork of a purely manual adjustment.[reference:3]
The input and output shafts are machined from 20Cr case-hardened and tempered steel, then ground to a surface hardness above HRC60. The internal planetary cones and contact rings are made from 100Cr6 heat-treated steel. This material combination resists the surface fatigue that would occur in softer contact components, extending service life in continuous-duty applications.[reference:4]
The die-cast aluminum alloy housing delivers the rigidity needed to hold the planetary cone-disk assembly under load at approximately one-third the weight of an equivalent cast iron housing. The housing is fully sealed, making the variator suitable for dusty, humid and washdown environments. The aluminum surface also resists corrosion without the paint maintenance that a cast iron housing would require.[reference:5]
The hollow shaft input is machined to IEC motor flange dimensions. An IEC B5 flange motor mounts directly to the variator input with the shaft engaging the hollow input. Input flange dimensions cover 63B5 through 132B5, matching motor frame sizes from 0.18 kW to 7.5 kW. Where a non-IEC motor is used, a solid shaft input is available.
Every UDL/UD unit is assembled in Raydafon's Ningbo factory under an ISO 9001 quality system. Material certificates are retained against the production batch, and each unit receives a run-in test and leak check before packing. Traceability documentation is available with the shipment.
The UDL/UD Series is specified wherever continuous speed adjustment is required without electrical control. The applications below are the ones most often quoted on a Raydafon UDL enquiry.[reference:6][reference:7]
A common procurement question is whether to specify a mechanical speed variator or an electrical variable frequency drive (VFD) for a given application. The comparison below uses the same rated motor power for both solutions.
| Parameter | UDL Mechanical Speed Variator | VFD (Variable Frequency Drive) |
|---|---|---|
| Speed Adjustment | Mechanical handwheel, continuous | Electronic, continuous |
| Speed Range | 1:1.4 to 1:7 | Typically 1:10 or wider |
| Speed Repeatability | ±0.5% max / ±0.1% min | Depends on encoder and control |
| Electrical Infrastructure | None — purely mechanical | Requires VFD panel and wiring |
| Torque at Low Speed | Constant torque across range | Torque reduction below base speed (without vector control) |
| Environment Sensitivity | Unaffected by electrical noise | Sensitive to harmonics and EMI |
| Remote Control | Manual only | Remote and PLC-compatible |
| Maintenance | Mechanical wear components | Electronic components, cooling fan |
| Initial Cost | Lower | Higher (including panel and installation) |
| Best Suited For | Simple speed matching, hazardous or dusty areas, retrofits | Wide-range speed control, remote operation, automated systems |
To confirm the correct UDL/UD model and issue a quotation, Raydafon needs the five items below. For a replacement unit, the original variator nameplate data or a dimensioned drawing is usually sufficient.
| # | Required Detail | Typical Format |
|---|---|---|
| 01 | Required output speed range | e.g., 200-800 rpm |
| 02 | Required output torque | N.m or kg.m, with safety factor if known |
| 03 | Motor interface | IEC frame size (63B5 to 132B5), motor power |
| 04 | Mounting configuration | B3 foot mount or B5 flange mount, orientation |
| 05 | Quantity and delivery date | Units required and required-on-site date |
Whether you are replacing a worn speed variator, specifying a new drive for an OEM machine build, or sourcing UDL/UD Series variators in production volume, Raydafon can quote to your speed range, torque, motor interface and mounting requirements. OEM and project quantities supplied directly from the Ningbo factory. ISO 9001 certified.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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