Technical data

Manual – Gear Units and Gearmotors

Adapter AR with torque limiting coupling (→ GK)

Project Planning for Components on the Input Side

6.3 Adapter AR with torque limiting coupling (→ GK)

SEW helical, parallel shaft helical, helical-bevel and helical-worm gear units are

designed with adapter and torque limiting coupling to protect the machine and the drive

against overload. IEC standard motors of sizes 71 to 180 can be mounted.

The torque is transmitted in a non-positive manner via friction ring pads. The slip torque

of the coupling can be adjusted with a setting nut and cup springs. Different slip torques

are possible depending on the thickness and arrangement of the cup springs. In the

event of an overload, the coupling slips and interrupts the power flow between motor and

gear unit. This prevents damages to the system and drive.

Multi-stage gear

unit with adapter

and torque limit-

ing coupling

In combination with multi-stage gear units, the adapter with torque limiting coupling is

preferably installed between the two gear units. Please contact SEW-EURODRIVE if

required.

Selecting the

gear unit

The type sizes of the AR adapter with torque limiting coupling correspond to those of the

AM adapter for IEC motors.

This means you can select the gear unit using the selection tables for AM adapters. In

this case, substitute the unit designation AM with AR and determine the required slip

torque.

Determining the

slip torque

The slip torque should be about 1.5 times the rated torque of the drive. When determin-

ing the slip torque, bear in mind the maximum permitted output torque of the gear unit

as well as the variations in the slip torque of the coupling (+/-20 %) which are a feature

of the design.

When you order a gear unit with adapter and torque limiting coupling, you have to

specify the required slip torque of the coupling.

If you do not specify the slip torque, it will be set according to the maximum permitted

output torque of the gear unit.

04604AXX

Figure 17: Helical-bevel gear unit with AR adapter