Complete Freewheels for Keyway Connection on The Outer Ring (BM20)

• Model: Bm 20
• Weight: 3.8kg
• Outside Diameter: 105mm
• Inside Diameter: 30mm
• Width: 77mm
• Nominal Torque: 420nm
• Model NO.: BM 20
• OEM: Accept
• Delivery: 10-15days
• Transport Package: Single Box or as Your Requirements
• Specification: P6
• Trademark: SUMA or OEM
• Origin: Changzhou, Jiangsu, China
• HS Code: 84836000
• Production Capacity: 500PCS/Month

Product Description

                                          Complete Freewheels for Keyway Connection on The Outer Ring (BM20)

Data Sheet

Item		BM 20
Brand		SUMA or OEM
Type		R
Weight		3.8 kg
Outside Diameter		105 mm
Inside Diameter		30 mm
Width		77 mm
Nominal Torque		420 Nm
Material		GCr15
Precision		P6
Application		textile machines;printing machines;fans;other machine

PRODUCT DESCRIPTION
 
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 freewheeling 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.

Catalogue

Freewheel Size	Type	Nominal t orque MN Nm	Sprag lift-off at inner ring speed min-1	Max. speeD		Bore d Standard mm   mm   mm			max. mm	A mm	D mm	F mm	L mm	M mm	N mm	O mm	P mm	S mm	Weight kg
				Inner ring freewheels/ overruns min-1	Outer ring drives min1
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

 
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.

Mounting
The customer attachment part is connected via a keyway connection with the outer ring. The
customer must provide the key required for assembling 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.

Company Information
Changzhou Suma Precision Machinery Co., Ltd(Changzhou Tianniu Clutch Factory)is a manufacturer specialized in Producing Various cam clutch, one way bearing, one way clutch, backstop clutch, overrunning clutch and other bearings with high technology. 

We are following "Best Quality, Best Price, Fast Delivery, Best Serves" to make all of our old and new customers satisfied. 
Our Advantages
1. Advanced producing equipment.
2. Strict requirement for the raw material
3. Complete&perfect process flow
4. Good quality of each batch of the product
5. Different grades of price for different quality