Complete Freewheels BM … X

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Deep groove ball bearing

Complete Freewheels BM … X

Product information

INTRODUCTION

Features

Complete Freewheels BM… X are sealed sprag

freewheels with ball bearings and sprag lift-off

X. They are supplied oil-filled and ready for

installation.

The sprag lift-off X ensures wear-free freewheel-

ing operation when the inner ring rotates at

high speed.

The freewheels BM … X are used as:

➧ Backstops

➧ Overrunning Clutches

for applications with high speed freewheeling

operation and when used as overrunning clutch

with low speed driving operation.

Nominal torques up to 42 500 Nm.

Bores up to 150 mm.

Application example

Complete Freewheel BM 60 SX as a backstop, arranged at the end of the intermediate shaft of a spur gearbox. The freewheel is used without the radial seal rings on each side, and is lubricated by the gearbox oil. A radial holding pin engages in the keyway of the outer ring. The backdriving torque is supported by the holding pin in the stationary housing. By removing the radial holding pin, the installation can be turned in both directions in order to carry out maintenance work. 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 t orque M_N Nm	Sprag lift-off at inner ring speed min^-1	Max. speed Inner ring freewheels/ overruns min^-1	Outer ring drives min^-1	mm	Bore d Standard mm mm		max. mm	A mm	D mm	F mm	L mm	M mm	N mm	O mm	P mm	S mm	Weight kg
BM 20	DX	420	750	1 700	300	30			30	121	105	0,75	77	20,25	8	35	4,0	2,5	3,8
BM 25	DX	700	700	1 600	280	35	40		40	144	125	0,75	93	22,25	10	47	5,0	2,5	6,6
BM 30	DX	1 250	630	1 600	252	45	50		50	171	150	0,75	102	24,25	12	52	5,0	4,0	10,3
BM 40	SX	1 900	430	1 500	172	45	55	60	60	202	180	0,75	116	25,25	16	64	6,0	6,5	17,4
BM 45	SX	2 300	400	1 500	160	55	65	70	70	218	195	1,25	130	24,75	20	78	7,5	8,5	22,4
BM 52	SX	5 600	320	1 500	128	65	75	80	80	237	215	1,75	150	33,75	25	79	9,0	8,5	31,1
BM 55	SX	7 700	320	1 250	128	75	85	90	90	267	245	1,75	170	35,25	25	96	9,0	6,5	45,6
BM 60	SX	14 500	250	1 100	100	85	95	100	105	314	290	1,75	206	40,25	28	122	10,0	6,5	78,2
BM 70	SX	21 000	240	1 000	96	120			120	350	320	1,25	215	44,75	28	123	10,0	9,0	93,4
BM 100	UX	42 500	210	750	84	150			150	450	410	3,75	276	56,25	36	156	12,0	11,5	198,4

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 customer attachment part is connected via
a keyway connection with the outer ring. The
customer must provide the key required for as-
sembling the attachment part.
The tolerance of the shaft must be ISO h6 or j6
and the tolerance of the pilot diameter D of the
attachment part must be ISO H7 or J7.

Example for ordering
Freewheel size BM 55, type with sprag lift-off X
and 90 mm bore:
• BM 55 SX, d = 90 mm