Transmittable forces

Transmittable forces

The specifications provided in the table apply to a bore tolerance of H7 and shaft tolerance of h5 in the connecting components. For an h6 shaft, in the most unfavourable constellation a 10% reduction of transmittable forces may be expected.
Subjection of the clamped connection to steady, pulsating, alternating or sudden stress has no impact provided the occurring peak forces do not exceed the catalogue values.

F: Max. permissible clamping force.
To avoid fatigue failure and due to the danger of fretting corrosion, in case of high clamping/release cycle frequencies, the clamping sleeves should be tensioned at a maximum of 0.75xF.

C: Required functional installation space
Spieth clamping sleeves must be clamped using the controlled applicaton of force. The clamping force cannot be applied in relation fo the coamping path. To prevent premature blocking, a "free" functional path "C" must be provided.

M: Transmittable torque at Fa = 0
The specified values were ascertained in a series of tests, in which the connecting components were made of C45 steel, produced with the stipulated surface quality.

Fa: Transmittable axial force at M = 0
The Fa-values shown in the table are calculated with:

M	= Transmittable torque (table) [Nm]
d1	= Shaft diameter [mm]

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M und Fa: If torque and axial forces act on a clamping sleeve at the same time, check using the following formula whether the resulting torque Mr is transmittable.

M	= Transmittable torque (table) [Nm]
Mr	= Resulting torque [Nm]
Me	= Required torque [Nm]
Fae	= Required axial force [N]
d1	= Shaft diameter [mm]

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If it is not possible to apply the clamping force F, the following formula is used for approximate determination of the torque Mred which can be transmitted with the given clamping force Fgeg (<= F).

Mred	= Reduced transmittable torque [Nm]
M	= Transmittable torque (table) [Nm]
Fgeg	= Given clamping force (<F) [N]
F	= max. permissible clamping force (table) [N]

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To ascertain the necessary clamping force for a transmittable torque Mred < M, an approximation is possible using the following formula:

Ferf	= Required clamping force [N]
Mred	= Reduced transmittable torque [Nm]
F	= max. permissible clamping force (table) [N]
M	= Transmittable torque (table) [Nm]

All friction-locked connections have the danger of fretting corrosion caused by alternating torsion or circulating bending stress. This could result in dismantling problems. To avoid these problems, please keep tension of:

Max. alternating trosion:

Max. circulating bending:

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