1-1. When connected to servomotor or stepping motor

To determine the correction torque, multiply the maximum torque of the servomotor or stepping motor by the service factor (SF) corresponding to the type of load listed in the table below.

1-2. When connected to general-purpose motor

To determine the correction torque, multiply the load torque calculated with the following formula by the service factor (SF) corresponding to the type of load listed in the table on the right.

Check that the shafts to be mounted are within the coupling’s range of mountable shaft diameters.

With the Power-Lock, check the Power-Lock size, quantity and transmission torque.

With the clamp type, make sure that the correction torque determined in Item (1) does not exceed the allowable transmission torque for the clamp.

Strength must be checked when mounting the product on a hollow shaft. Inquire for information.

ECHT-FLEX Couplings satisfying Items 1 to 2 above should be chosen from the transmission capacity table.

When long spacer types are used at high speeds, the rotation speed needs to be checked to avoid the resonance point.

When selecting long spacer types, check each model number’s J dimension and whether its rotation speed is within the limit.

Select by increasing the model number if the rotational speed used is over the listed rate.

Long spacer high-speed type

A larger coupling size can be selected as a way to avoid a dangerous RPM range. When use of a larger size is not possible, the same effect can be achieved by increasing the spacer weight. Please contact us.

Cautions for servomotor drive

Dynamic balance adjustment

Normally, because ECHT-FLEX couplings provide a well-balanced design, they need no particular balance adjustment. However, when the coupling is used at a high rotation speed, or when a long spacer is used, balance adjustment may be required. In this case, inform us of your desired operating rotation speed, JIS balance rating, dimension “J ”, or spacer length so that we can perform your balance adjustment.

For dynamic balance adjustment, we use the following two methods: 1) Drilling the spacer flange end face, and 2) Mounting a balance weight to the spacer pipe periphery. (The spacer with a balance weight is shown below. The balance weight mounting position and quantity vary depending on operating conditions.

Be careful not to interfere with the balance weight during rotation. )

When requesting a balance adjustment, specify either method 1) or 2) above.

A spacer mounted with a balance weight

Notes for large distance between shaft ends

For large distance between shaft ends, Tsubaki offers a Long Spacer Type that can be used in a floating state without the need for an intermediate shaft bearing. We recommend this type of coupling if it fits your application needs.

Long spacer type

To avoid the ‘skipping rope phenomenon’ when your conditions require use of an intermediate shaft instead of a long spacer, use bearings to fasten intermediate shafts. The spacer type is the recommended disk coupling in this case.

Spacer type + fixed intermediate shaft + Spacer type

If the distance between shafts is short and an intermediate shaft is used in a floating condition, be sure to use the Single-Type coupling.

Single hub + floating intermediate shaft +Single hub

Never use the spacer type with additional floating shaft.

Spacer type + floating intermediate shaft + Spacer type

Pay special attention to the above when replacing gear couplings or roller chain couplings with disk couplings.