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