Complete Freewheels BA … X and BC … X

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Centimeter Equipment Trading Company Limited

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Complete Freewheels BA … X and BC … X

Product information

INTRODUCTION

Features

Complete Freewheels BA … X and BC … X with lever arm are sealed sprag freewheels with ball bearings and with sprag lift-off X. The sprag liftoff X ensures wear-free freewheeling operation when the inner ring rotates at high speed.

The freewheels BA … X have an end cover and are fitted to shaft ends. The oil filling is carried out after the freewheel has been fitted to the end of the shaft.

The freewheels BC … X are supplied oil-filled and are arranged on through shafts or shaft ends.

The freewheels BA … X and BC … X 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 45 SX as a backstop, arranged at the end of the intermediate shaft of a spur gearbox. The backdriving torque is supported by the lever arm with holding pin on the gearbox housing. If the holding pin is removed, the shaft can be turned in both directions. With the high shaft speed in normal operation (freewheeling operation), 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	DX	400	750	1 700	30			30	110	90	106	8	80	2,5	77	11	104	19,5	65	70	M 10	5
BA	25	BC	25	DX	650	700	1 600	35	40		40	126	100	126	8	90	2,5	93	11	125	19,5	75	80	M 12	8
BA	30	BC	30	DX	1 100	630	1 600	45	50		50	155	120	151	10	120	3,5	102	16	140	27,5	95	100	M 16	12
BA	40	BC	40	SX	1 400	430	1 500	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	SX	2 300	400	1 500	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	SX	4 900	320	1 500	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	SX	6 500	320	1 250	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	SX	14 500	250	1 100	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	SX	21 000	240	1 000	120			120	335	260	321	25	280	14,5	215	39	291	65,5	225	210	M 24	115
BA 100		BC 100		UX	42 500	210	750	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 en-
gages 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.
The freewheels BC … X are supplied oil-filled
and ready for installation.
In the case of freewheels BA … X, the inner ring
must be secured axially with a retainer plate.
Prior to commissioning, the freewheel must be
filled with oil of the specified quality.

Example for ordering
Freewheel size BA 30, type with sprag lift-off X
and 50 mm bore:
• BA 30 DX, d = 50 mm
When ordering, please also specify the
freewheeling direction of the inner ring when
viewed in direction X:
• counterclockwise free or
• clockwise free