Planetary and Worm Gearboxes PLG/SG

Worm gearboxes (SG) are noted for their very quiet running. The worm gear shaft has bearings on both sides. The gear components, made of bronze or steel, and the lubrication ensure a long service life at the rated torque. In many applications, the location of the output shaft at 90° to the motor shaft provides an optimum design solution. On request, worm gearboxes can be supplied with a hollow output shaft.

Planetary gearboxes (PLG) have the highest continuous torque capacity of all types of gearbox; at the same time they have a very compact form, low weight, and excellent efficiency. Self-centering planet gears ensure a symmetrical force distribution. The ring gear also forms the housing of the gearbox. The gearbox output shaft is supported in two ball bearings so that it can withstand high axial and radial loads. The gearboxes are customized, e.g. for use in especially low ambient temperatures, or as high-power gearboxes with reinforced output shafts, or with special lubricants for very long service life.

Engineering Reference

In the wide range of Dunkermotoren products, you will find a suitable drive for almost any requirement in powers ranging from 1 – 500 Watt. The following points should be taken into account when selecting motors and gearboxes:

• Which type of operation is required (continuous, intermittent or periodic operation)?
• What is the working life expected of the motor?
• What torque and speeds are required?
• How much space is available for the motor?
• How high is the available voltage? DC or AC?
• Are there special environmental conditions (temperature, humidity, vibration, ...)?
• To what degree can heat from the motor be disposed of?
• Are there exceptional axial and radial shaft loads to consider?
• What demands are made of the motor control electronics?
• Is the motor to be controlled online via a bus system?
• Do you need a brake, an encoder or a non-reversing device?

When laying out a suitable motor, determining the required torque plays a decisive role in avoiding thermal overload of the motor in service.

In the assembly of a drive system consisting of motor and control electronics, it is important to ensure that permissible values for the motor are not exceeded by outputs from the electronics. Depending on the speed of rotation required, a motor or a motorgearbox combination may be selected. The choice of a reduction gearbox will largely depend on the recommended maximum torque in continuous operation. For intermittent duty, loading above the rated torque is possible.

When choosing a motor after deciding on the gearbox, the following applies:

M_motor = M_gearbox / (i x ŋ)

We will be pleased to carry out a precise adaptation of a motor to your service conditions.

Planetary and Worm Gearboxes (311kb)