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Integrated Freewheels FXM

Integrated Freewheels FXM
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Integrated Freewheels FXM for bolting to the face with sprag lift-off X Application as ➧ Backstop ➧ Overrunning Clutch For application as backstop in installations with high speeds in freewheeling operation. For application as overrunning clutch in installations with low speeds in driving operation. Features Integrated Freewheels FXM are sprag freewheels without bearing support and with sprag lift-off X. The sprag lift-off X ensures a wear-free freewheeling operation when the inner ring rotates at high speed. Nominal torques up to 1 230 000 Nm. Bores up to 560 mm. A multitude of standardized bore diameters are available with short delivery times. Sprag lift-off X Integrated Freewheels FXM are equipped with sprag lift-off X. The sprag lift-off X is used for backstops and overrunning clutches, provided that in freewheeling operation the inner ring is rotating at high speed and providing with overrunning clutches that the driving operation is conducted at low speed. In freewheeling operation, the centrifugal force FC causes the sprag to lift off from the outer track. In this operating state, the freewheel works wear-free, i.e. with unlimited service life. Figure 60-2 shows a freewheel with sprag liftoff X in freewheeling operation. The sprags, which are supported in a cage connected with the inner ring, rotate with the inner ring. The centrifugal force FC that is applied in the center of gravity S of the sprag turns the sprag counterclockwise and rests against the support ring of the cage. This results in the gap a between the sprag and the outer track; the freewheel works without contact. If the inner ring speed decreases to such an extent that the effect of Support ring Freewheeling direction or freewheeling operation Locking direction or driving operation the centrifugal force on the sprag is less than that of the spring force FF , the sprag again rests on the outer ring and the freewheel is ready to lock (figure 60-3). If used as an overrunning clutch, the driving speed must not exceed 40% of the lift-off speed

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Application example Integrated Freewheel FXM 170 - 63 MX with end cover as backstop fitted to the end of the first intermediate shaft of a spur gearbox in the drive of an inclined conveyor belt. In the case of a motor stop, the conveyor belt must be held securely so that the conveyor goods do not pull the belt backwards and possibly cause serious damage. Due to the high shaft speeds in normal operation (freewheeling operation), the sprag lift-off X ensures a contactless and hence wear-free continuous operation. Integrated Freewheels Application example Two Integrated Freewheels FXM 120 - 50...

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Type with sprag lift-off X For extended service life using sprag lift-off at high speed rotating inner ring The maximum transmissible torque is 2 times the specified nominal torque. See page 14 for determination of selection torque. The theoretical nominal torque applies only for ideal concentricity between the inner and outer ring.In practice, the concentricity is affected by the bearing play and centering errors of the neighbouring parts. Then the nominal torques specified in the table apply, whilst taking into consideration the existing run out (T.I.R.). Higher speeds upon request....

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Freewheel Size Integrated Freewheels ■ Freewheels with bore diameters highlighted blue in the table are available with short delivery times. Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10. * Keyway according to DIN 6885,page 3 • Tolerance of keyway width JS10. ** Z = Number of fastening holes for screws G on pitch circle T. Lubrication At speeds in excess of the sprag lift-off speed, no special lubrication is required; the freewheel functions maintenance-free. When operating below the sprag lift-off speed, an oil lubrication of the specified oil quality must be...

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Type with sprag lift-off X For extended service life using sprag lift-off at high speed rotating inner ring The maximum The theoretical ing parts. Then Higher speeds transmissible torque nominal torque appl the nominal torques upon request. is 2 times the specified nominal torque. See page 14 for determination of selection torque. ies only for ideal concentricity between the inner and outer ring.In practice, the concentricity is affected by the bearing play and centering errors of the neighbour-specified in the table apply, whilst taking into consideration the existing run out (T.I.R.)....

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Freewheel Size Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10. * Z = Number of fastening holes for screws G on pitch circle T. Integrated Freewheels Lubrication Example for ordering At speeds in excess of the sprag lift-off speed, Freewheel size FXM 240 - 63, type with sprag no special lubrication is required; the freewheel lift-off X and 185 mm bore: When operating below the sprag lift-off speed, an oil lubrication of the specified oil quality must be provided.

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