CYCLO Drive with Torque Limiter
CYCLO Drive with Torque Limiter

Cyclo® Gearmotor with Torque Limiter

Detect overloads instantaneously with installed torque limiter

  • Cyclo® gearmotor with installed torque limiter to detect overloads
  • Protects your valuable machines from catastrophic failure.
  • Torque limiting is applied at the drive, which allows you to optimize your equipment design, and enhance your machine safety factor. 
Output Shaft Solid shaft
Output Shaft Direction(s) Any Mounting Direction (horizontal, vertical downward, vertical upward)
Mounting Style Foot Mount, Flange Mount, Case Mount
Frame Size 15 sizes
Reduction Ratio 6:1 - 658503:1
Capacity 1/4 to 40 HP (0.2 kW - 30 kW)
Motor Types Three phase, premium efficiency, high efficiency, for inverters, outdoors, compatible with overseas standards
±10%
(accuracy of configured torque ±5 - ±10%)
±25%
Adjustable range for the configured torque
0Worry
Our Cyclo® Gearmotor provides safe, worry-free performance with built-in safety features.

Product Features

Compact

Compact Cyclo® reducer boasts a high reduction ratio, high efficiency, and a small number of parts, including a superior built-in torque sensor

High Accuracy and Reliability

The sensor base consists of coiled springs or load cells, and features high accuracy and reliability.

Allows for Economical Equipment Design

Torque limiting is applied at the drive part, allowing you a more accurate examination of your device safety factor, which makes optimal equipment design possible.

Operates During Momentary Overload

The mechanical torque detection mechanism allows for a shorter detection time compared to thermal relays, detecting overloads instantaneously.

Wide Range of Torque Adjustment

The adjustment range for configuring the torque is a wide ±25%, which means adjustments can easily be made on-site to match the actual torque of the equipment.

Safe Unattended Operation

Built-in buzzer and indicator light in the motor operation circuit ensures a safe unattended operation. By using either the double or triple safety models, it is also possible to drive the auxiliary motor for a thickener shaft.

Combine with Other Protection Equipment

Can be combined with shear pins to achieve double or triple protection against overloads.

Break-resistant Teeth

Unlike a regular involute tooth-gear, the "cycloidal disc," which is the gear for the Cyclo® Reducer, features a distinctively smooth curve.


A unique circular-arc tooth profile is also used for the internal gear. The smooth rolling contact that prevents tooth breakage results in a durable reducer with a long service life. (Some low reduction ratio models use helical gears and planetary gears.)

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Do you supply a torque arm? At what position should it be mounted? A torque arm assembly is offered as an option. The standard torque arm assembly and standard mounting positions are shown in the Appendix of our catalog.

The mounting positions for the Cyclo® BBB4 detail the position of the unit relative to the driven shaft. The mounting position effects how the unit is assembled and maintained (i.e., location of oil fill ports, type of lubrication, breather location, etc.). You must specify the mounting position at the time of order.

The Cyclo® speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity and all but eliminates the conventional limitations due to heat.

The standard ratings for Cyclo® BBB4 are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0). By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for the severe operating conditions.

Shaft tolerances will depend on the type of load and shock load of the application.  Shaft tolerance recommendations are included in the Appendix of our catalog.

The direction of shaft rotation on Hyponic reducers varies according to frame size and ratio.  Please refer to the Appendix in our catalog for specific data on the shaft rotation of various models.

The reducer’s radial load capacities are calculated at the midpoint of the slow speed shaft extension.  Radial load capacities decrease if the center of the load is moved farther from the reducer and the values obtained must be adjusted accordingly.  Refer to the Special Load Guidelines section in the Appendix of our cagtalog for load location factors.

The Taper-Grip® bushing is integral to the Cyclo® BBB4 and provides for easy mounting and removal to and from the shaft of the driven machine.  Because it requires no key way, the shaft isn’t weakened and maximum torque is transmitted.

The Hyponic® speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity and all but eliminates the conventional limitations due to heat.

The Hyponic® motor cannot be replaced because the hypoid gear is controlled as a set with the motor shaft. Contact our Aftermarket Department for replacement service.

When mounting a pulley, sprocket, or sheave, mount as close to the unit housing as possible; never mount beyond the midpoint of the shaft projection to avoid undue bearing load and shaft deflection.  Never overtighten belts or chains.  Careful and accurate installation is essential for best results and trouble-free operation.  Before installing, the shafts should be checked to make sure they are parallel and level.  After mounting, alignment should be checked with a string or straight edge held against the sides of the sprocket or pulley base.  Couplings should be properly aligned to the limits specified by the manufacturer.  Check alignment prior to initial startup on coupled Hyponic® units.

The standard torque arm assembly supplied is a turnbuckle type as shown in our catalog. The torque arm should be mounted at 90 degrees to a line from the point of attachment to the reducer and the center of the output bore with up to 30 degrees plus or minus variance. A bracket type torque arm is also offered as a non-stock option. In addition, we provide the Banjo-type and T-type torque arm mounting configurations.

Yes, loads imposed on the slow speed shaft will vary according to the method used to connect the shaft to the driven machine.  Frequently, in addition to the torsional forces, radial (overhung) and thrust loads are applied to the slow speed shaft at the same time.  For example, coupling connections normally involve torsional forces only.  However, when power is transmitted through spur gears, belts, pulleys, or chains, both torsional and radial forces may be present.  When driving through helical or bevel gears, all three conditions (torsional, radial, and thrust load) may be referred to the reducer shaft.  The slow speed shaft and bearings must have sufficient strength to withstand these loads, and it is necessary to determine the allowable limits for each condition.  The Special Load Guidelines section in the Appendix of our catalog explains how to calculate the overhung load (radial) applied to the output shaft.

The Hyponic® is standardly supplied as a shaft mount with a keyed hollow bore.  Options are available for a solid shaft with feet and a flange mounting configuration.  Since the Hyponic® is grease lubricated as standard, it can be mounted in any position 
without modifications.

In general terms, the speeds are 1750 and 1165 RPM.  The selection tables in our catalog are based on 1750 RPM.  When non-standard input speeds are used, the horsepower and torque ratings also vary.

Selection is based on the actual horsepower and/or torque requirements at the output shaft.  The Hyponic® speed reducer has particularly high efficiencies over a wide range of reduction ratios, which frequently permits the use of reduced input power requirements (smaller HP motor) without sacrificing output shaft torque.  The selection procedures in our catalog will guide you in choosing the most efficient reducer for your application.

With an increased torque capacity, the new Steel Taper-Grip® bushing can be used in reversing and/or high start-up applications. The new Steel Taper-Grip®bushing can be used on all Taper-Grip® products.

In general, reducers and gearmotors are rated for the specific conditions and operating requirements of the application by the use of AGMA-defined Service Factors.  There are three AGMA load classifications for reducers: uniform (U), moderate shock (M) and heavy shock (H). Refer to our catalog for a list of AGMA load classifications. These Service Factors are used in the product selection process to adjust for the specific conditions and operating requirements of your application.

Hyponic® uses hypoid gearing, which is more efficient than worm gearing and quieter than bevel gearing. It is superior within the right-angle drives.

Cyclo® BBB4 Speed Reducers provide 300% momentary intermittent shock load capacity. For applications with shock loads greater than 300%, consult a Sumitomo Application Engineer.

Visit our Cyclo® BBB5 Product Configurator to find the exact match for your applications.

A hypoid reducer is more efficient than the traditional worm gear reducer.  The reason why a hypoid gear is more efficient than a worm gear is due mainly to two factors:  gear tooth profile and the material it is made of.  Hypoid gear is all-steel, while worm gear uses steel and a bronze wheel (that will wear down). 

The mounting positions for the Cyclo® HBB detail the position of the unit relative to the driven shaft. The mounting position effects how the unit is assembled and maintained (i.e., location of oil fill ports, type of lubrication, breather location, etc.). You must specify the mounting position at the time of order.

In general terms, the speeds are 1750 and 1165 RPM. The selection tables in our catalog are based on 1750, 1165, 870, 580, and 50 RPM. When non-standard input speeds are used, the kilowatt (or horsepower) and torque ratings also vary.

The standard ratings for Cyclo® BBB4 are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0). By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for the severe operating conditions.

The Cyclo speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity, and all but eliminates the conventional limitions due to heat.

To select the proper reducer for your application, you need to know: Application: type of driven machine 
Hours of operation per day 
Motor horsepower (HP) and speed (RPM) 
Mounting position 
Ambient environment (altitude, dusty, chemical, explosive, water) 
Ambient temperature and humidity 
You must also note any special environment factors or operational requirements. This information will be important in determining your application's service factor.

This is because Cyclo has a high teeth engagement rate. Since the Cyclo gearing has two-thirds of its reduction components in contact at all time, it can withstand higher shock loads and is more stable than traditional involute gearing.

Models having an "N" after the nomenclature symbol "C (Cyclo)," are universal mounting models that can be mounted in any direction . However, when there is an "H (horizontal)," "V (vertical with slow speed shaft downward)" or "W (vertical type with slow speed shaft upward)," after the "C," the unit cannot be mounted in any direction other than the one specified.

Mounting bolts are not included. Refer to the maintenance manual for mounting bolt specifications.

Generally, Cyclo® Drives allow for input at 3600r/min for up to 3HP, 6:1 to 87:1 ratio. For more than 3HP, it varies depending on frame size and reduction ratio. Many Cyclo models can accept input speeds of up to 3,600 RPM. However, the maximum allowable input speed is dependent upon the model number and the reduction ratio.

Theoretically any combination is available by multiplying single reduction ratios: 6, 8, 11, 13, 15, 17, 21, 25, 29, 35, 43, 51, 59, 71, 87, and 119:1.

The standard ratings for Cyclo are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0). By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for the severe operating conditions.

Cyclo® BBB4 Speed Reducers provide 300% momentary intermittent shock load capacity. For applications with shock loads greater than 300%, consult a Sumitomo Application Engineer.

Cyclo frame size 606 to 612# are called “MF: Maintenance Free.” Grease replenishment is not required for normal operating conditions, and grease fittings are not utilized. Sumitomo recommends overhaul and grease change at 20,000 hours or 4-5 years. However, when the Cyclo uses special grease for high or low ambient temperature and grease fittings are installed, then grease replenishment and grease changes are required according to the appropriate factory schedule.

Cyclo® is a type of internal planetary gear. The planetary gear has cycloidal-shaped teeth. All torque-transmitting parts roll, not grind. Unlike the normal involute teeth with limited contact points, a Cyclo has two-thirds of its reduction components in contact at all times. Multiple teeth share the load, so therefore the Cyclo® is not susceptible to tooth breakage.

Selection should be made based on required Service factor. The Service Factor value depends on the load characteristics and operation time for the customer’s application.

The standard torque arm assembly supplied is a turnbuckle type as shown in our catalog. The torque arm should be mounted at 90 degrees to a line from the point of attachment to the reducer and the center of the output bore with up to 30 degrees plus or minus variance. A bracket type torque arm is also offered as a non-stock option. In addition, we provide the Banjo-type and T-type torque arm mounting configurations.

The mounting positions for the Cyclo® BBB4 detail the position of the unit relative to the driven shaft. The mounting position effects how the unit is assembled and maintained (i.e., location of oil fill ports, type of lubrication, breather location, etc.). You must specify the mounting position at the time of order.

The Taper-Grip® bushing is integral to the Cyclo® BBB4 and provides for easy mounting and removal to and from the shaft of the driven machine.  Because it requires no key way, the shaft isn’t weakened and maximum torque is transmitted.

The Cyclo® speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity and all but eliminates the conventional limitations due to heat.

With an increased torque capacity, the new Steel Taper-Grip® bushing can be used in reversing and/or high start-up applications. The new Steel Taper-Grip®bushing can be used on all Taper-Grip® products.

A gear tooth, such as that of Paramax, with a 25-degree pressure angle provides for greater torque transmission due to its wider dedendum. It is also important in minimizing tooth breakage due to shock loading.

In general terms, the speeds are 1750 and 1165 RPM.  The selection tables in our catalog are based on 1750 RPM.  When other input speeds are used, the horsepower and torque ratings will vary.

Cyclo® BBB5 Speed Reducers provide 300% momentary intermittent shock load capacity. For applications with shock loads greater than 300%, consult a Sumitomo Application Engineer.

Visit our Cyclo® BBB4 Product Configurator to find the exact match for your applications.

The standard ratings for Cyclo® BBB5 are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0). By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for the severe operating conditions.  Sumitomo recommend our Cyclo® BBB4 product for extremely severe operating conditions, as it is a more robust right-angle gearbox design.

Yes, 1.25:1 thru 5:1 in the parallel shaft configuration; and 1.6:1 thru 4:1 in the right angle shaft configuration.

Yes, 1.25:1 thru 5:1 in the parallel shaft configuration; and 1.6:1 thru 4:1 in the right angle shaft configuration.

Yes, many options exist for integral backstop; consult the factory for design details.

Up to 5 million inch-pounds, or more than 550 kiloNewtons

Yes, but these are options, and require additional design lead time.

Please consult a Sumitomo Sales Representative. They will review your application and provide an optimum Paramax selection.

While all gearboxes maintain thermal limitations, our new Paramax 9000 series has been improved to provide an 87% higher thermal rating over the previous series. This results from optimizing the units' fan cooling system as well as the airflow over the surface. 

A gear tooth, such as that of Paramax, with a 25-degree pressure angle provides for greater torque transmission due to its wider dedendum. It is also important in minimizing tooth breakage due to shock loading.

Special voltage, dust-proof, humidity-proof, high-temp, special shaft, CSA and NEMA standard conformance options are available.

To select the proper reducer for your application, you will need to know:Application: type of driven machine
Hours of operation per day
Motor horsepower (HP) and speed (RPM)
Loading Conditions
Mounting Position 
Ambient environment (altitude, dusty, chemical, explosive, water) 
Ambient temperature and humidity 
You must also note any special environment factors or operation requirements. This information will ve important in determining your application's service factor.

In general terms, the speeds are 1750 and 1450 RPM.  The selection tables in our catalog are based on 1750 RPM.  The reducer selection tables show ratings at 1750 RPM for Quill models, and 1750 and 1450 for C-face models.

Hyponic® speed reducers provide 250% momentary intermittent shock load capacity.  For applications with shock loads greater than 250%, consult a Sumitomo Application Engineer.

The standard ratings for Hyponic® are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0).  By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for severe operating conditions.

In general, reducers and gearmotors are rated for specific conditions and operating requirements of the application by the use of AGMA-defined Service Factors.  There are three AGMA load classifications for reducers: uniform (U), moderate shock (M) and heavy shock (H), and three AGMA load classifications for gearmotors: III, and III. Refer to our catalog for a list of AGMA load classifications. These Service Factors are used in the product selection process to adjust for the specific conditions and operating requirements of your application.

Emergency After-Hours Support

757-485-3355

Sumitomo’s Product Support offers scheduled repair services as a one-stop-shop for all your related gearbox needs. For emergency repairs, we offer repair services 24 hours a day, 7 days a week.

Cyclo and Spur Gear

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