Complete Freewheels BA … XG and BC … XG

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Complete Freewheels BA … XG and BC … XG

Product information

INTRODUCTION

Features

Complete Freewheels BA … XG and BC … XG with lever arm are sprag freewheels with sprag lift-off X and grease-lubricated ball bearings.

The sprag lift-off X ensures wear-free freewheeling operation when the inner ring rotates at high speed.

The freewheels BA … XG have an end cover and are fitted to shaft ends.

The freewheels BC … XG are arranged on through shafts or shaft ends.

The freewheels BA … XG and BC … XG are used as:

➧Backstops

for applications with high speed freewheeling operation.

Nominal torques up to 42 500 Nm.

Bores up to 150 mm.

Application example

Complete Freewheel BA 52 SXG as a backstop on a radial fan. The backstop prevents a reverse rotation of the fan shaft from air flow or from an incorrectly polarized drive motor. By pulling out the holding pin in the lever arm, the shaft can be turned in both directions in order to carry out maintenance work. With the high shaft speed, the type with sprag lift-off X is used; the sprags work in freewheeling operation without contact and hence are wear-free.

Freewheel Size				Type	Nominal Torque M_N Nm	Sprag lift-off at inner ring speed min^-1	Max. speed Inner ring freewheels min^-1	mm	Bore d Standard mm	mm	max. mm	A mm	C mm	D mm	E mm	H mm	K mm	L mm	N mm	O mm	P mm	Q mm	R mm	S for Screw	Weight kg
BA	20	BC	20	DXG	400	750	2 500	30			30	110	90	106	8	80	2,5	77	11	104	19,5	65	70	M 10	5
BA	25	BC	25	DXG	650	700	2 350	35	40		40	126	100	126	8	90	2,5	93	11	125	19,5	75	80	M 12	8
BA	30	BC	30	DXG	1 100	630	2 350	45	50		50	155	120	151	10	120	3,5	102	16	140	27,5	95	100	M 16	12
BA	40	BC	40	SXG	1 400	430	2 200	45	55	60	60	190	150	181	12	160	5,5	116	22	160	37,5	130	120	M 16	20
BA	45	BC	45	SXG	2 300	400	2 200	55	65	70	70	210	160	196	14	175	7,5	130	26	176	41,5	140	130	M 16	25
BA	52	BC	52	SXG	4 900	320	2 200	65	75	80	80	230	190	216	14	200	4,5	150	26	208	41,5	160	150	M 20	35
BA	55	BC	55	SXG	6 500	320	2 000	75	85	90	90	255	200	246	15	210	3,5	170	29	228	49,5	170	160	M 20	50
BA	60	BC	60	SXG	14 500	250	1 800	85	95	100	105	295	220	291	20	250	8,5	206	35	273	60,5	200	190	M 24	91
BA	70	BC	70	SXG	21 000	240	1 650	120			120	335	260	321	25	280	14,5	215	39	291	65,5	225	210	M 24	115
BA 100		BC 100		UXG	42 500	210	1 450	150			150	420	380	411	45	345	31,5	276	60	372	80,5	280	270	M 30	260

The maximum transmissible torque is 2 times the specified nominal torque. See page 14 for determination of selection torque.

Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10.

Mounting
The backdriving torque is supported by the lever arm with holding pin. The holding pin engages in a slot or bore in the frame of the machine. It must have 0,5 to 2 mm play in the axial and radial directions.
If the holding pin is removed, the shaft can be turned in both directions.
The tolerance of the shaft must be ISO h6 or j6.

Lubrication
Please note the technical points on page 118 r egarding grease-lubricated ball bearings.

Example for ordering
Freewheel size BC 45 type with sprag lift-off X, grease lubrication and 65 mm bore: