Tyre Coupling selection procedure

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1) Service Factor.

From Table 1 (at the bottom of the article), select the service factor that is appropriate for the application.

2) Design Power.

Multiply the absorbed power of the driven machine, in kW, by the service factor, from step 1) to obtain the design power. If the absorbed power is not known, use the prime mover power.

3) Tyre coupling size selection.

Refer to Table 2 (at the bottom of the article).

Read down the left hand vertical column to the required speed.

Read horizontally across on the speed line until a power equal to or more than the design power, from step 2), is reached.

Read vertically to the top of the column to obtain the correct size of tyre coupling.

4) Bore dimensions.

From our online catalogue (available here; https://en.challengept.com/shaft-couplings/ffx-tyre-couplings.html), check that the selected coupling will fit the shafts.

Tyre Coupling selection example

Select a Challenge tyre coupling to drive a reciprocating pump from a 980 rev/min, 30 kW electric motor. The pump absorbs 24kW and runs for 16 hours/day.

The motor shaft is 60 mm diameter and the pump shaft is 55 mm diameter.

If you want to learn more, please visit our website Half Gear Half Rigid Couplings.

Taper bush flanges are required for both shafts.

1) Service factor.

From Table 1, the service factor for this application is 1.9

2) Design power.

Using the absorbed power of the pump, the design power is 24 x 1.9 = 45.6 kW

3) Tyre coupling size selection.

Refer to Table 2.

By reading down and interpolating for the required speed of 980 rev/min, it is seen that an FFX 090 will transmit 50.45kW which is in excess of the 45.6 kW required from step 2)

4) Bore dimensions.

From our online catalogue (available here; https://en.challengept.com/shaft-couplings/ffx-tyre-couplings.html),  it is seen that both &#;F&#; and &#;H&#; flanges on an FFX 090 take a taper bush which are available with bores to suit the shaft requirements of the application.

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