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| Place of Origin | CHINA |
| Brand Name | SUMA |
| Certification | ISO SGS |
| Model Number | BD20 |
BD20 Complete Freewheel 1700RPM Overrunning Clutch Bearing
Features
Complete Freewheels BD … X are sealed sprag freewheels with ball bearings and sprag lift-off X. They are supplied oil-filled. The sprag lift-off X ensures wear-free freewheeling operation when the inner ring rotates at high speed.
The freewheels BD … X are used as:
➧ Backstops
➧ Overrunning Clutches
for applications with high speed freewheeling operation and when used as an overrunning clutch with low speed driving operation.
Nominal torques up to 42 500 Nm.
Bores up to 150 mm.
Technical Datas
| Item | BD20 |
| Inner dia. | 20 mm |
| Outer dia. | 106 mm |
| Width | 77 mm |
| Torque | 420 Nm |
| Weight | 3.8 kg |
| Port | Shanghai;Ningbo |
| Delivery time | 10-15 days |
| Package | wooden package, carton package,etc |
| Application | Conveyer, Electric Motor,Bucket elevator,etc |
Dimensions and Capacities
|
Freew heel Size |
Type |
Nom inal torque |
Sprag lift-off at inner ring speed min-1 |
Max. speed ring freew heels/ runs min-1 |
Outer ring drives min-1 | mm |
Bore d dard mm |
mm | max. mm | B mm |
D mm |
F mm |
G** | H mm |
K mm |
L mm |
R mm |
S mm |
T mm |
Z** |
Wei ght |
| BD 20 | DX | 420 | 750 | 1 700 | 300 | 30 | 30 | 65,5 | 106 | 0,75 | M 6 | 26 | 5 | 77 | 70 | 0,5 | 90 | 6 | 3,8 | ||
| BD 25 | DX | 700 | 700 | 1 600 | 280 | 35 | 40 | 40 | 81,5 | 126 | 0,75 | M 6 | 30 | 5 | 93 | 80 | 0,5 | 105 | 6 | 6,6 | |
| BD 30 | DX | 1 250 | 630 | 1 600 | 252 | 45 | 50 | 50 | 88,5 | 151 | 0,75 | M 8 | 36 | 6 | 102 | 100 | 1,5 | 130 | 6 | 10,3 | |
| BD 40 | SX | 1 900 | 430 | 1 500 | 172 | 45 | 55 | 60 | 60 | 102,5 | 181 | 0,75 | M10 | 37 | 6 | 116 | 120 | 3,5 | 160 | 6 | 17,4 |
| BD 45 | SX | 2 300 | 400 | 1 500 | 160 | 55 | 65 | 70 | 70 | 115,5 | 196 | 1,25 | M 12 | 38 | 6 | 130 | 130 | 5,0 | 170 | 8 | 22,4 |
| BD 52 | SX | 5 600 | 320 | 1 500 | 128 | 65 | 75 | 80 | 80 | 130,5 | 216 | 1,75 | M14 | 44 | 8 | 150 | 150 | 4,5 | 190 | 8 | 31,1 |
| BD 55 | SX | 7 700 | 320 | 1 250 | 128 | 75 | 85 | 90 | 90 | 146,5 | 246 | 1,75 | M 14 | 48 | 10 | 170 | 160 | 2,5 | 215 | 8 | 45,6 |
| BD 60 | SX | 14 500 | 250 | 1 100 | 100 | 85 | 95 | 100 | 105 | 182,5 | 291 | 1,75 | M 14 | 55 | 10 | 206 | 190 | 2,5 | 250 | 8 | 78,2 |
| BD 70 | SX | 21 000 | 240 | 1 000 | 96 | 120 | 120 | 192,5 | 321 | 1,25 | M 16 | 58 | 10 | 215 | 210 | 5,0 | 280 | 8 | 93,4 | ||
| BD 100 | UX | 42 500 | 210 | 750 | 84 | 150 | 150 | 248,5 | 411 | 3,75 | M 20 | 79 | 10 | 276 | 270 | 6,5 | 365 | 10 | 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.
* Keyway according to DIN 6885, page 3 • Tolerance of keyway width JS10.
** Z = Number of tapped holes G on pitch circle T.
Mounting Example
Complete Freewheel BD 45 SX as an overrun-ning clutch on the shaft end of the high speed rotating main drive of a textile machine. The sprocket is linked to an auxiliary drive. In normal operation (freewheeling operation) the inner ring overruns and the outer ring is at a standstill with the bolted on sprocket. During set-up, the machine is driven by the slowly running aux i-liary drive via the chain drive and the freewheel that is working in the driving operation. With the high speed of the inner ring in freewheeling operation, the type 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 centered on the diameter R and bolted on to the face. The pilot on the covers is particularly suitable for at- taching smaller and narrower parts (sprockets, gear wheels etc.). The customer must provide fastening screws of the necessary length in order to mount the attachment part.
The tolerance of the shaft must be ISO h6 or j6 and the tolerance of the pilot diameter R of the attachment part must be ISO H7 or J7.
Example for ordering
Freewheel size BD 30, type with sprag lift-off X
and 45 mm bore:
• BD 30 DX, d = 45 mm
Pictures
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