Schaeffler North America

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Drawn cup roller clutches

INA drawn cup roller clutches are one-way clutches comprising thin-walled, formed outer rings with locking ramps on the inside diameter, plastic cages and needle rollers positioned by springs.

They transmit torque in one direction and have a low idling frictional torque in the other direction.

Customer requirements for high indexing accuracy and high indexing frequency are reliably achieved by INA drawn cup roller clutches due to the constant spring pressure.

Roller clutches with plastic springs are an economical variant, since the springs are moulded as part of the cage. Alternatively, the springs can be made from steel, giving more precise indexing behaviour.

Drawn cup roller clutches are fitted by pressing into the housing, axial location is not necessary. In order to support torque transmission when clutches are press fitted into plastic housings, drawn cup roller clutches can be supplied with a knurled outer ring.

It must be noted that the drawn cup roller clutch is a one-way clutch and not a bearing. If a bearing arrangement is required since radial forces are acting on the drawn cup roller clutch, an additional bearing arrangement must be provided. Furthermore, the bearing arrangement can be integrated in the drawn cup roller clutch, giving an HFL.

The bearing arrangement can be provided by a needle roller bearing or plain bearing. Plain bearings are more economical and, especially in the case of smaller drawn cup roller clutches, are advantageous due to the reduced design envelope. However, they have a higher frictional torque than needle rollers.


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