Selecting Speed Reducers

Speed reducers are mechanical devices generally used for two purposes: to multiply the amount of torque generated by an input power source to increase the amount of usable work and to reduce the input power source speed to achieve desired output speeds.

Speed Reducers

The selection and integration of speed reducers entails much more than simply picking one out of a catalogue. In most cases the maximum torque, speeds, and radial loads published cannot be used simultaneously. Proper service factors must be applied to accommodate a wide range of dynamic applications. And, once the appropriate speed reducer is selected, proper installation and maintenance are the keys to maximizing life.

DieQua Coorporation, an OEM Industrial supplier, specializes in gearboxes and reducers. 

How to Choose

There are several things you should know about sizing and applying before settling on a speed reducer.

Service Factors for Speed Reducers

Before choosing any reducer, specifications must be collected to properly size and install the unit:

  • torque
  • speed
  • horsepower
  • reducer efficiency
  • service factor
  • mounting position
  • connection variable
  • life required

In some applications the amount of backlash, transmission error, torsional rigidity, and moment of inertia are also important. The amount of torque needed is perhaps the most important criteria, as this translates to the amount of work the speed reducer must perform. 

Integrating Speed Reducers

After selection, the next issue is how the gearbox will be integrated into the machine. Always check how the gearbox will be mounted and how it will be connected to the driver and driven load because it can vary from machine to machine.

Many gearbox designs allow for the motor to be directly mounted to the reducer. These designs incorporate either extremely precise flanges to allow the motor to be directly plugged into the reducer or other adapters with integral couplings. This eliminates the need for separate mounting of the motor, but is usually only practical with smaller motors.

About DieQua

DieQua Corporation is a manufacturer and supplier of power transmission and motion control components. Diequa offers a wide range of gearboxes, gearheads, speed reducers, and gearmotors and other drive products. DieQua is the North American agent for Spinea precision reduction gears. Spinea develops and manufactures high-precision reduction gears sold under the trademark TwinSpin.

Visit DieQua page »

*This article first appeared in the October 2001 issue of Motion Systems Design magazine. DieQua Corporation offers a wide range of speed reducing solutions. Contact OEM Industrial Inc to find out how your machine drive system can be improved!

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