Airflex® Air Cooled Disc Clutches and Brakes
Section E
DBA Description ....................................................................................................................................................................... 181
DBA Brake Elements .................................................................................................................................................................. 183
DBA Technical information ......................................................................................................................................................... 184
DBB and DBBS Description ..................................................................................................................................................... 185
DBB Brake Elements .................................................................................................................................................................. 187
DBB Technical Information ......................................................................................................................................................... 188
DBBS Brake Elements ................................................................................................................................................................ 189
DBBS Technical Information ....................................................................................................................................................... 191
Type DC Description ................................................................................................................................................................. 192
DC Technical and Dimensional Data ........................................................................................................................................... 194
Type FHB Description................................................................................................................................................................ 196
Floating Housing Brake Technical and Dimensional Data............................................................................................................ 197
Selection Procedure ................................................................................................................................................................. 200
180
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
Airflex® DBA Description
Section E
Model DBA brakes are spring applied, pressure released, disc
style brakes. They develop equal torque in either direction of
rotation. Their torque and thermal capacities allow them to be
used in the most demanding applications.
Brake construction and operation is shown in the figure.
Pressurizing the brake compresses the brake springs and
withdraws the clamping plates from the brake discs. Standard
brakes are furnished with either one or two discs, which are
free to move axially.
Model DBA uses a rubber diaphragm to form the releasing
pressure chamber and to serve as the releasing piston. Brake
friction material is attached to stationary components. Brake
discs are either solid or ventilated. The disc type is indicated
by an S for solid, or V, for ventilated, in the brake model designation. Solid discs are used in applications requiring a heat
sink and/or where engagement is infrequent. Ventilated discs
are recommended for cyclic applications.
Torque ratings listed are for brakes with a standard compliment of springs. The quantity of springs can be varied to
customize the torque of the brake to suit a particular application. Consult the factory for brake torque of units with nonstandard spring configurations.
Brake sizes are indicated by the number of brake discs and
the disc diameter in inches. For instance, size 229DBA has
two discs 29 inches in diameter.
Features
Large friction area.
Allows brakes to absorb and dissipate high energy loads associated with high cyclic and high inertia stops.
Where used:
•• Can making machines
•• Draglines
•• Power shovels
•• Conveyors
•• Power presses
Minimal adjustment required for lining wear.
Single disc units require no wear adjustment and dual disc
units require only one wear adjustment during the long life of
the friction material.
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
181
Airflex® DBA Component parts
Section E
1
23
4
8
7
29
15, 21
19, 20
26, 27, 28
6
18
33
30, 31
16, 17
13
22
14, 15
12
11
32
34
2
3
5
25
9
10
24
35
Dual disc element shown
37
36
182
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
Item Number Description
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
28 29 30 31 32 33 34 35 36 37 Mounting Flange
Stud
Clamp Tube
Disc
Friction Disc
Flat Head Screw
Pressure Plate
Spring Housing
Locknut
Outer Clamp Ring
Diaphragm
End Plate
Inner Clamp Ring
Hex Head Screw
Lockwasher
Hex Head Screw
Lockwasher
Spring Retainer Plate
Inner Spring
Outer Spring
Hex Head Screw
Gear
Reaction Plate
Release Spring
Wear Spacer
Name Plate
Self Tapping Screw
Warning Decal
Washer
Air Tube
Air Tube
90 Deg. Street Elbow
90 Deg. Male Elbow
Cross
Hose Assembly
Flow Control Valve
Bushing
Airflex® DBA Brake Elements
Form DBA808 — Dimensional and Technical Data
Section E
D1
O2
G
G
D29
H13
D7
H13
H16
D29
D7
H16
H11
H11
D25
D25
Special Mounting Flanges
are available which permit
direct mounting to 800
Series frame motors.
6 Equally spaced
mounting holes on a
H bolt circle.
D
D
See Note
Single Disc Brake
Dual Disc Brake
English Dimensions in inches
17DBA 21DBA 29DBA 2.00 2.00 2
2.75 21.000 3.000 31.000 17.25 21.00 28.00 10.00 12.12 14.75 5.38 7.62 10.25 24.998 26.498 33.998 0.78 1.06 1.06 1/2-14
1-11 1/2
1-11 1/2
Basic Size D25 H
H11 H13 H16 G
L
02 
17DBA 21DBA 29DBA 51 51 70 533 584 787 438 533 711 254 308 375 137 194 260 634,9 673,0 863,5 20 27 27 1/2-14
1-11 1/2
1-11 1/2
SI Dimensions in millimeters
English Dimensions in inches
117DBA 217DBA 121DBA 221DBA 129DBA 229DBA 329DBA 2.50 3.25 2.88 3.88 3.94 4.88 5.63 Size Bore Range Ventilated Disc Types Solid Disc Types
117DBA 217DBA 121DBA 221DBA 129DBA 229DBA 329DBA Min. 64 79 73 98 105 124 143 D
D1 319 284 401 366 335 287 418 371 394 349 486 441 582 D
272 341 288 361 383 459 SI Dimensions in millimeters
4.25 4.25 5.75 5.88 7.38 7.19 6.88 Max. 108 108 146 149 187 182 175 12.55 11.19 15.77 14.41 13.19 11.33 16.47 14.61 15.51 13.75 19.13 17.38 22.93 4.88 6.50 2.50 5.63 3.50 7.12 10.63 D7 124 165 64 143 89 181 270 1.00 1.88 2.12 2.12 2.25 2.25 2.34
D29 25 48 54 54 57 59 59
10.69 13.41 11.33 14.23 15.06 18.06 Notes:
 Tolerance +0.000/-0.003 in (+0,00/-0,08 mm)
 All ventilated disc brakes are furnished with an approximate 15.5 inch
(394 mm) length of flexible hose and a flow control valve having a 1-11
1/2 American National Pipe Thread port.
 American National Pipe Thread
4.88 6.50 5.62 5.62 5.88 7.00 1.88
1.88
2.00
2.25
2.38
3.12
D7 124 165 143 143 149 178 D29
48
48
51
57
60
79
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
183
Airflex® DBA Elements
Dimensional and Technical Data
Section E
English lbin psi in3 in2 lbft2 lb rpm
117DBAS 217DBAS 121DBAS 221DBAS 129DBAS 229DBAS 146148 146152 146145 146151 146162 146163 413113 413248 413534 413535 413801 414126 29300 52600 69800 129300 176700 336200 85 85 85 85 100 100 100 100 160 160 310 310 270 540 406 812 890 1780 18 35 42 80 152 292 95 160 130 270 325 520 2300
2300
1900
1900
1500
1500
Size 
Part
Number GearMr 
Part
Torque
Number Rating DiscDisc
&
&
Gear Gear Housing
Maximum
Speed
117DBAS 146148 413113 3310 5,9 1,64 1742 217DBAS 146152 413248 5940 5,9 1,64 3483 121DBAS 146145 413534 7890 5,9 2,62 2619 221DBAS 146151 413536 14600 5,9 2,62 5237 129DBAS 146162 413801 20000 6,9 5,08 5741 229DBAS 146163 414126 38000 6,9 5,08 11481 Wk2Weight
J
Mass
0,76 43 1,47 72 1,76 59 3,36 122 6,38 147 12,26 236 2300
2300
1900
1900
1500
1500
SI kgm2 Nm Minimum

ReleasingReleasing Friction
Pressure Volume Area
410 455 610 565 950 1150 bar dm3 cm2 186 206 276 256 430 521 kg rpm
English lbin in3 in2 lbft2 lb rpm
117DBAV 217DBAV 121DBAV 221DBAV 129DBAV 229DBAV 329DBAV 146148 146152 146145 146151 146162 146163 146210 100 100 160 160 310 310 310 270 540 406 812 890 1780 2670 10 20 30 60 97 191 285 70 112 105 210 185 340 495 1300
1300
1000
1000
900
900
900
Size 
GearMr 

PartPartTorque Releasing
Friction
Number Number Rating Volume Area
413113 413248 413534 413535 413683 413585 415080 20500 38000 52500 96000 113000 216000 339000 320 363 480 565 970 1150 1549 DiscDisc
&
&
Gear Gear Housing
Maximum
Speed
Wk2Weight
J Mass
117DBAV 146148 413113 2320 1,64 1742 0,42 32 145 217DBAV 146152 413248 4290 1,64 3483 0,84 51 164 121DBAV 146145 413534 5930 2,62 2619 1,26 48 217 221DBAV 146151 413535 10800 2,62 5237 2,52 95 256 1300
1300
1000
1000
129DBAV 229DBAV 329DBAV 900
900
900
146162 146163 146210 413683 413585 415080 12800 24400 38400 SI Nm 5,08 5,08 5,08 5741 11481 17223 4,07 8,02 11,97 84 154 224 dm3 cm2 kgm2 kg Notes:
 Basic part number only. Does not include gear. Gear must be ordered
separately with the bore and keyway requirements.
 Dynamic torque shown. Static torque approximately 1.15 greater. Torque
values are for new linings. Torque decreases with lining wear. At the
worn out condition, torque is approximately 0.66 of values shown.
184
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
439 521 708 rpm
 Torque ratings are for units with a standard complement of springs.
Consult factory for torque ratings of units with non-standard spring
configurations.
 Maximum allowable cylinder pressure is 120 psi (8,3 bar).
 Absolute volume of releasing cavity.
 Minimum releasing pressure 60 psi (4,1 bar).
Airflex® DBB Description
Section E
Model DBB brakes are spring applied, pressure released, disc
style brakes. They develop equal torque in either direction of
rotation. Their torque and thermal capacities allow them to be
used in the most demanding applications.
Brake construction and operation is shown in the figure.
Pressurizing the brake compresses the brake springs and
withdraws the clamping plates from the brake discs. Standard
brakes are furnished with either one or two discs, which are
free to move axially.
Model DBB uses a conventional piston design to release the
brake discs. The rotating component of the DBB style brake
is a very low inertia friction disc core with riveted on friction
discs. The low inertia of the rotating components coupled
with the high heat sink capacity of the stationary members allow these units to provide superior performance in high cyclic
applications. In applications requiring higher speed operation or where precise balance of the rotating components is
required, the DBBS style is offered, which utilizes a solid rotor
and stationary friction material. Similar to the DBAS design,
the DBBS should only be used for applications where brake
engagement is non-cyclic.
Torque ratings listed are for brakes with a standard compliment of springs. The quantity of springs can be varied to
customize the torque of the brake to suit a particular application. Consult the factory for brake torque of units with nonstandard spring configurations.
Brake sizes are indicated by the number of brake discs and
the disc diameter in inches. For instance, size 225DBB has
two discs 25 inches in diameter.
Where used:
•• Bottling equipment
•• Power Shovels
•• Conveyors
•• Shears
•• Power Presses
Features
Low inertia friction disc assembly.
Reduces the overall inertia that must be stopped.
Optional split friction discs.
Allows removal of friction discs without disturbing other components of drive system in mid-shaft brake arrangement.
Long wearing, self lubricating PolyPak* seals.
Eliminates premature twisting failure and requires no external
lubrication.
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
185
Airflex® DBB Description
Section E
9
4
22
5
18
14
1
15
6, 7
10
13
23, 24
17
27
19
29
16
30
25
35
2
28, 32, 33
26
20
8
3
11
12
34
21
Dual disc element shown
31
Item Number Description
Item Number Description
Item Number Description
1
2
3
4
5
6
7
8
9
10 11 12 Mounting Flange
Stud
Friction Disc Sub-Assembly
Friction Disc
Friction Disc Core
Rivet
Washer
Clamp Tube
Pressure Plate
Spring Housing
Flat Washer
Locknut
13 14 15 16 17 18 19 20 21 22 23 24 Cylinder
Hex Head Screw
Outer Seal
Spring
Inner Seal
Spacer Tube
Gear
Wear Spacer
Reaction Plate
Release Spring
Flat Washer
Hex Head Screw
25 26 27 28 29 30 31 32 33 34 35 Ring Gear
Pipe Nipple
Elbow
Pipe Cross
Hose Assembly
Pipe Nipple
Flow Control Valve
45 Deg. Street Elbow
Pipe Reducer
Hose Assembly
Spring Retainer
186
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
Airflex® DBB Brake Elements
Dimensional and Technical Data Section E
English Dimensions in inches
109DBB 209DBB 309DBB 115DBB 215DBB 120DBB 220DBB 320DBB 420DBB 125DBB 225DBB 325DBB 425DBB 138DBB 238DBB 338DBB 438DBB 1.68 1.94 2.13 2.13 3.06 3.00 3.75 4.25 4.50 3.88 3.88 5.38 5.88 6.00 7.38 8.38 9.06 2.50 2.56 2.63 2.50 4.25 5.88 6.00 5.88 5.88 7.50 7.56 7.50 7.50 11.00 11.00 10.88 10.88 Size 
Bore Range
Min. SI Dimensions in millimeters
7.26 8.70 9.06 4.38 11.16 10.87 13.04 15.21 17.38 12.07 14.38 16.69 19.00 16.25 19.05 21.85 24.65 1.75 4.00 5.25 2.88 4.38 3.00 6.27 8.25 10.31 3.50 7.00 9.31 12.00 5.00 9.00 12.00 5.00 6.06
7.53
9.06
7.52
9.23
9.37
11.54
13.68
15.84
10.57
12.88
15.19
17.50
14.25
17.05
19.73
22.52
109DBB 209DBB 309DBB 115DBB 215DBB 120DBB 220DBB 320DBB 420DBB 125DBB 225DBB 325DBB 425DBB 138DBB 238DBB 338DBB 438DBB 43 49 54 54 78 76 95 108 114 99 99 137 149 152 187 213 230 D 
D1 W4 
Size 
Bore Range
Min. Max.
64 65 67 64 108 149 152 149 149 191 192 191 191 279 279 276 276 184 221 202 242 283 276 331 386 441 307 365 424 483 413 484 555 626 44 102 133 73 111 76 159 210 262 89 178 236 305 127 229 305 381 154
191
230
191
235
238
292
347
402
268
327
386
445
362
433
501
572
D 
D1 W4 
Max.
English Dimensions in inches
9DBB 1.00 0.25 
3.12 12.125  8.375 12.37 3/8-18
15DBB 1.47 0.38 0.38 6.00 18.375  14.375 18.94 1/2-14
20DBB 1.50 0.38 1.00 8.50 23.250  18.250 23.82 1/2-14
25DBB 1.75 0.25 0.75 11.50 30.630  24.375 30.89 1/2-14
38DBB 2.45 0.25 1.25 16.50 44.750  36.375 45.01 3/4-14
Size D31 D44 D45 H16 J
J1 J2 O2 
9DBB 15DBB 20DBB 25DBB 38DBB 25 37 38 44 62 6
10 10 6
6

10 25 19 32 79 152 216 292 419 308.0 466.7 590.6 778.0 1136.7 212.7 365.1 463.5 619.1 923.9 SI Dimensions in millimeters
30°
5°
Mounting
60°
314 481 605 785 1143 5°
6°
Bolt Circles
9DBB
(6) 0.531 (13,5) Ø Mounting
holes equally spaced as
shown on 11.125 (282,5) Bolt
15DBB
(6) 0.656 (16,7) Ø Mounting
holes based on 8 equally
spaced holes on
20DBB
(12) 0.656 (16,7) Ø Mounting
holes equally spaced as
shown on 22.000 (558,8) Bolt
Notes:
 0.50 in (13mm) for 109 DB
0.25 in (6mm) for 209 DBB
0.00 in (0mm) for 309 DBB
 Tolerance +0.000/-0.003 in (+0,00/-0,08 mm)
*
25DBB
(12) 0.656 (16,7) Ø Mounting
holes equally spaced as shown
on 28.750 (730,3) Bolt Circle
3/8-18
1/2-14
1/2-14
1/2-14
3/4-14
* Sizes 325 & 425 have 0.781"
(19.8 mm) Mounting Hole
38DBB
(16) 1.062 (27,0) Ø Mounting
holes equally spaced as
shown on 42.000 (1066,8)
 Basic part number only. Does not include gear. Gear must be ordered
separately with the bore and keyway requirements.
 Dynamic torque shown. Static torque approximately 15% greater.
Torque values are for new linings. Torque decreases with lining wear. At
the worn out condition, torque is approximately 0.66 of values shown.
 American National Pipe Thread.
 Torque ratings are for units with a standard complement of springs.
Consult factory for torque ratings of units with non-standard spring
configurations.
 Brake in disengaged position.
 Maximum allowable cylinder pressure is 120 psi (8,3 bar).
 All DBB brakes can be supplied plumbed as shown with a flow control
valve having American National Pipe thread ports of 1/2-14 for size
9DBB, 3/4-14 for sizes 15DBB, 20 DBB, 25DBB and 1-11 1/2 for size
38DBB
 Tolerance +/- 0.12

Absolute volume of releasing cavity.
 Tolerance +0.003/-0.000 in (+0,08/-0,00 mm)

Maximum diameter of “as cast”surfaces.
 Some high torque applications of three and four disc elements require
additional support on the cylinder side of the unit. Contact your local
Airflex representative for more details.
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
187
Airflex® DBB Brake Elements
Dimensional and Technical Data
Section E
D
W4
O2
D44
D45
J2 J J1
D1
D31
Single Disc Brake
H16
Dual Disc Brake
See Note on
pg. E-7
See Note
English lb  in psi in3 in2 lbft2 lb rpm
109DBB 209DBB 309DBB 115DBB 215DBB 120DBB 220DBB 320DBB 420DBB 125DBB 225DBB 325DBB 425DBB 138DBB 238DBB 338DBB 438DBB 146333 146334 146380 146222 146337 146299 146300 146378 146379 146315 146327 146370 146381 146295 146296 146386 146387 415313 415314 416481 415454 415302 415900 416059 416304 416471 416073 416074 416223 416477 416068 416069 416241 416464 7500 14000 19400 30000 57000 53500 101500 149500 180000 115300 219000 303000 392000 420000 800000 1153000 1470000 60 60 60 60 60 60 60 60 60 60 60 60 60 60 60 60 60 30 30 30 75 75 133 133 133 133 259 259 259 259 612 612 612 612 96 192 238 238 476 334 668 1002 1336 600 1201 1802 2403 1322 2644 3966 5288 0.5 1
1.83 5
10 17 33 49 65 47 93 139 185 287 562 837 1112 9
18 27 35 64 40 67 213 102 78 148 403 280 203 340 1087 1424 3000
3000
3000
2400
2400
1850
1850
1850
1850
1400
1400
1400
1400
950
950
950
950
Size 
Part
Number GearMr 
Part
Torque
Number rating Minimum 
releasing
pressure 
Disc
ReleasingFriction &
Volume
Area
Gear
Housing
Wk2 Weight
J
Mass
109DBB 146333 415313 847 4,1 0,49 619 0,02 4
209DBB 146334 415314 1581 4,1 0,49 1238 0,04 8
309DBB 146380 416481 2192 4,1 0,49 1857 0,07 12 115DBB 146222 415454 3387 4,1 1,23 1535 0,21 16 215DBB 146337 415302 6435 4,1 1,23 3070 0,42 29 120DBB 146299 415900 6040 4,1 2,18 2154 0,71 18 220DBB 146300 416059 11459 4,1 2,18 4309 1,39 30 320DBB 146378 416304 16879 4,1 2,18 6463 2,06 97 420DBB 146379 416471 20338 4,1 2,18 8617 2,73 46 125DBB 146315 416073 13017 4,1 4,25 3870 1,97 35 225DBB 146327 416074 24725 4,1 4,25 7746 3,91 67 325DBB 146370 416223 34237 4,1 4,25 11623 5,84 183 425DBB 146381 416477 44067 4,1 4,25 15499 7,77 127 138DBB 146295 416068 47418 4,1 10,03 8527 12,05 92 238DBB 146296 416069 90320 4,1 10,03 17054 23,60 154 338DBB 146386 416241 130282 4,1 10,03 25581 35,15 493 438DBB 146387 416464 166101 4,1 10,03 34108 46,70 646 SI 188
nm bar EATON Airflex® Clutches & Brakes 10M1297GP November 2012
dm3 cm
2
kgm
2
115 145 135 225 275 385 487 590 695 705 935 1120 1250 1955 2325 3280 3850 52 66 36 102 125 175 221 277 315 320 424 508 567 887 1055 1488 848 kg Maximum
speed
3000
3000
3000
2400
2400
1850
1850
1850
1850
1400
1400
1400
1400
950
950
950
950
rpm
Airflex® DBBS Component Parts
Section E
18
17
5
10
14
Dual disc element shown
1
13
6
9
11
15
12
20
19
2
16
4
3
21
8
7
Item Number Description
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 Mounting Flange
Stud
Friction Disc
Clamp Tube
Pressure Plate
Spring Housing
Flat Washer
Lock Nut
Cylinder
Hex Head Screw
Inner Seal
Spring
Outer Seal
Spacer Tube
Gear
Wear Spacer
Reaction Plate
Release Spring
Spring Retainer
Flat Head Screw
Disc
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
189
Airflex® DBBS Brake Elements
Dimensional and Technical Data
Section E
English Dimensions in inches
120DBBS 220DBBS 320DBBS 420DBBS 125DBBS 225DBBS 325DBBS 425DBBS 138DBBS 238DBBS 338DBBS 438DBBS 150DBBS
250DBBS
350DBBS
450DBBS
3.50 5.63 10.30 4.25 5.69 13.48 4.88 5.75 16.63 5.13 5.81 19.81 4.50 7.00 11.49 5.50 7.13 14.73 6.13 7.38 17.96 6.63 7.31 21.19 8.50 10.06 15.20 8.50 10.06 18.97 9.63 10.06 22.60 10.38 10.38 26.34 10.2415.51 20.43
12.3615.51 24.84
13.9015.51 29.29
14.8815.51 35.24
3.00
6.27
10.31
12.50
3.50
7.00
12.00
15.00
5.00
9.00
13.00
18.00
5.75
10.00
14.49
20.00
Size
Bore Range
D
D1
262 342 422 503 292 374 456 538 386 482 574 669 519
631
744
895
76
159
262
318
89
178
381
381
127
229
330
457
146
254
368
508
Min. 120DBBS 89 220DBBS 103 320DBBS 124 420DBBS 130 125DBBS 114 225DBBS 140 325DBBS 156 425DBBS 168 138DBBS 216 238DBBS 216 338DBBS 245 438DBBS 264 150DBBS260
250DBBS314
350DBBS353
450DBBS378
SI Max.
143 145 146 148 177 181 187 186 256 256 256 264 394
394
394
394
J1
J2 J
Single Disc element
J2 J
D
D44
D31
Single Disc element
D
D45
J2
H16
D44
D1
O2
D45
Dimensions in millimeters
J2
English Dimensions in inches
20DBBS 25DBBS 38DBBS 50DBBS
1.50 0.38 1.00 1.75 0.25 1.00 2.45 0.25 1.00 3.500.25 2.00
8.50 23.25z 18.250 11.50 30.63z 24.375 16.50 44.498 36.375 23.0046.25z57.64
Size D31 D44 D45 H16 J J1 J2 O2 
20DBBS 38 25DBBS 44 38DBBS 62 10 6
6
25 25 25 216 292 419 590.6 463.5 778.0 5°619.1 1135.7 923.9 SI J1
D31
23.82 30.89 45.00 1-11
1/2-14
1/2-14
3/4-14
1/2
605 1/2-14
6°
785 1/2-14
1143 3/4-14
Dimensions in millimeters
H16
D1
O2
Dual Disc element
Mounting Bolt Circles
Dual Disc element
5°
5°
Mounting Bolt Circles4°
6°
5°
4°
Notes:
 Brake in disengaged position.
 Tolerance +0.000/-0.005 in (+0,00/-0,08 mm)
 Tolerance +0.003/-0.000 in (+0,08/-0,00 mm)
 Maximum diameter of “as cast”surfaces.
 American National Pipe Thread.
z Tolerance +.120/-.120 in (+3.00/-3.00 mm)
* Sizes 325 and 425 have 0.781 (19.8) mounting holes
190
20DBBS
(12) 0.656 (16.7) Ø
Mounting holes equally
spaced as shown on
22.000 (558.0) Bolt
EATON Airflex Clutches & Brakes 10M1297GP November 2012
®
25DBBS
25DBBS 20DBBS
38 DBBS
*
(12) 0.656
0.656
(16.7) Ø
Ø
(16)(12)
1.062
(27.0)
(12) 0.656 (16.7)
Ø (16.7) Ø
Mounting holes equally
Mounting holes equally
Mounting holes
equally
holes
equally
spaced
as shown on Mounting
spaced
as shown
on
22.000 (558.0)
28.750
Bolt
spaced as shown
on Bolt
spaced
as (730,0)
shown
on
28.750 (730,0) Bolt
42.000 (1066.8) bolt circle
38 DBBS
50 DBBS
50 DBBS
(16) (16)
1.062 1.438
(27.0) Ø(36.5) Ø
(16) 1.438 (36.5) Ø
Mounting holes equally
Mounting holes equally
Mounting
holes
spaced
as shown
on equally spaced as shown on
as circle
shown on 54.000 (1371.6) bolt circle
42.000spaced
(1066.8) bolt
54.000 (1371.6) bolt circle
Airflex® DBBS Brake Elements
Dimensional and Technical Data
Section E
English lbin Worn
Torque
Multiplier
psi in3 in2 lbft2 lb rpm
120DBBS 146323 415900 80,000 —
90 133 346 33 125 400 2200
220DBBS 146322 416059 150,000 —
90 133 692 65 232 550 2200
320DBBS 146373 416471 224,000 —
90 133 1,038 120 357 720 2200
420DBBS 146374 416472 220,000 —
90 133 1,384 159 464 914 2200
125DBBS 146320 416073 173,000 —
90 259 628 89 212 880 1700
225DBBS 146330 416074 325,000 —
90 259 1,255 178 416 1,318 1700
325DBBS 146382 416477 455,000 —
90 259 1,883 309 682 1,585 1700
425DBBS 146383 416470 585,000 —
90 259 2,510 411 854 1,882 1700
138DBBS 146328 416068 630,000 .81
90 612 1,357 553 583 2,125 950
238DBBS 146329 416069 1,200,000 .80
90 612 2,714 1,094 1,100 3,125 950
338DBBS 146384 416414 1,730,000 .80
90 612 4,071 1,709 1,680 4,085 950
438DBBS 146385 416461 2,200,000 .79
90 612 54,28 2,285 2,264 4,975 950
150DBBS1465244172771 ,798,000
.81
120
1,115 2,111 1,682 1,0715,872 600
250DBBS1465254172783 ,284,000
.79
120
1,115 4,222 3,330 1,9297,196 600
350DBBS1465264172794 ,555,000
.77
120
1,115 6,333 4,895 2,7388,685 600
450DBBS1465274172805 ,578,000
.75
120
1,115 8,444 6,506 3,51510,092600
Size  
GearMr 
Worn Minimum 
 Disc
PartPartTorqueTorque
Releasing
Releasing
Friction
&
Number Number Rating Multiplier
Pressure volume
Area
Gear
Housing
Maximum
Speed
Wk2 Weight
J Mass
120DBBS 146323 415900 9.032 —
6,2 2,18 2.232 1,39 56 181 2200
220DBBS 146322 416059 16.935 —
6,2 2,18 4.465 2,74 105 249 2200
320DBBS 146373 416471 25.290 —
6,2 2,18 6,697 5,06 162 327 2200
420DBBS 146374 416472 24.839 —
6,2 2,18 8.930 6,70 211 415 2200
125DBBS 146320 416073 19.532 —
6,2 4,24 4.052 3,75 96 398 1700
225DBBS 146330 416074 36.693 —
6,2 4,24 8.097 7,50 188 596 1700
325DBBS 146382 416477 51.372 —
6,2 4,24 12.149 13,03 310 720 1700
425DBBS 146383 416470 66.049 —
6,2 4,24 16.194 17,34 388 855 1700
138DBBS 146328 416068 71.127 .81
6,2 10,02 8.755 23,30 264 962 950
238DBBS 146329 416069 135.480 .80
6,2 10,02 17.510 46,10 498 1.414 950
338DBBS 146384 416414 195.325 .80
6,2 10,02 26.265 72,10 736 1.856 950
438DBBS 146385 416461 248.391 .79
6,2 10,02 35.020 96,41 1.029 2.261 950
150DBBS146524417277203,164 .81
8.3
18.3
13,619 70.88 486 2,663 600
250DBBS146525417278371,073 .79
8.3
18.3
27,239 140.33875 3,264 600
350DBBS146526417279514,689 .77
8.3
18.3
40,858 206.281,2423,939 600
450DBBS146527417280630,282 .75
8.3
18.3
54,477 274.161,5944,578 600
SI Nm bar dm3 cm2 kgm2 kg Notes:
configurations.
 Basic part number only. Does not include gear. Gear must be ordered
separately with bore and keyway requirements.
 Maximum allowable cylinder pressure is 120 psi (8,31 bar).
 Dynamic torque shown. Static torque approximately 15% greater.
Torque values are for new linings. Torque decreases with lining wear. At
worn out condition, torque is approximately 0.66 of values shown,
unless otherwise noted.
rpm
 Absolute volume of releasing cavity.
 Torque ratings are for units with a standard complement of springs.
Consult factory for torque ratings of units with non-standard spring
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
191
Airflex® Type DC Element Description
Section E
Type DC elements can be used as either pressure actuated
clutches or brakes. They are available in single and multiple
disc designs.
Element construction and operation is illustrated in the figure.
Pressurizing the cylinder causes the piston to clamp the
friction disc assemblies between clamping plates. External
springs ensure positive disengagement.
Type DC elements are available in five basic disc sizes with
static torque ratings to 2,061,000 lb.in (233.000 N.m). Element sizes are indicated by the number of friction discs and
by the disc diameter in inches. For instance, size 225DC has
two friction discs 25 inches in diameter.
Features
Favorable torque to size ratio.
DC type elements are physically smaller than most other type
clutches and brakes with the same torque capacity.
Low inertia friction disc assembly.
Reduces the overall inertia that must be started or stopped.
Optional split friction discs.
Allows removal of friction discs without disturbing other components of drive system in mid-shaft element arrangement.
Where used:
Long wearing, self lubricating PolyPak* seals.
Eliminates premature twisting failure and requires no external
lubrication.
•• Tension Brakes
192
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
•• Power Presses
•• Emergency Stop Brakes on Unwind Stands
Airflex® DC Component Parts
Section E
4
5
19
17
Dual disc element shown
1
6, 7
14
18
20, 21
13
15
12
22
2
16
8
3
9
10
11
Item Number Description
Item Number Description
1
2
3
4
5
6
7
8
9
10 11 Mounting Flange
Stud
Friction Disc Sub-Assembly
Friction Disc
Friction Disc Core
Rivet
Washer
Clamp Tube
Pressure Plate
Flat Washer
Locknut
12 13 14 15 16 17 18 19 20 21 22 Cylinder
Inner Seal
Outer Seal
Gear
Wear Spacer
Reaction Plate
Piston
Release Spring
Flat Washer
Hex Head Screw
Ring Gear
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
193
Airflex® Type DC Elements
Technical Data
Section E
lbin
English @ 75 psi rpm in3 in2 lbft2 lb
109DC 209DC 115DC 215DC 120DC 220DC 320DC 420DC 125DC 225DC 325DC 425DC 138DC 238DC 338DC 438DC 3000 3000 2400 2400 1850 1850 1850 1850 1400 1400 1400 1400 950 950 950 950 4
7
9
17 27 53 79 105 43 86 129 172 102 203 304 405 96 192 238 476 334 668 1002 1336 600 1201 1801 2400 1322 2644 3966 5288 8
9.5 55 65 82 104 126 148 339 420 501 582 2031 2139 2247 2355 60 70 170 190 235 297 359 421 557 689 821 953 1568 1651 1734 1817 10500 21000 41000 82000 77000 154000 231000 308000 160000 320000 480000 640000 560000 1120000 1680000 2240000 1600 1600 1050 1050 850 850 850 850 650 650 650 650 450 450 450 450 24 30 60 70 133 160 187 214 216 259 302 345 510 612 714 816 0.5 1
5
10 17 33 49 66 47 93 140 186 287 562 837 1112 9
18
35
64
77
145
213
281
143
273
403
533
413
750
1087
1424
 Mr DiscDisc
Torque
Maximum Engaging
Friction&&
Size Rating Speed
Volume
Area Housing Gear Housing Gear 
Disc Element New Worn
Wk2 Weight
J Mass
109DC 1190 3000 1600 0,07 0,39 619 0,34 0,02 27 209DC 2370 3000 1600 0,11 0,49 1238 0,40 0,04 32 115DC 4630 2400 1050 0,15 0,99 1535 2,32 0,21 77 215DC 9260 2400 1050 0,28 1,15 3069 2,74 0,42 86 120DC 8690 1850 850 0,44 2,18 2154 3,46 0,72 107 220DC 17390 1850 850 0,87 2,63 4307 4,38 1,39 135 320DC 26080 1850 850 1,30 3,07 6461 5,31 2,06 163 420DC 34770 1850 850 1,72 3,52 8614 6,24 2,76 191 125DC 18060 1400 650 0,71 3,55 3869 14,29 1,98 253 225DC 36130 1400 650 1,41 4,25 7744 17,70 3,92 312 325DC 54190 1400 650 2,12 4,96 11619 21,11 5,90 372 425DC 72260 1400 650 2,83 5,67 15488 24,53 7,84 432 138DC 63220 950 450 1,68 8,38 8524 85,59 12,09 711 238DC 126450 950 450 3,33 10,05 17048 90,14 23,68 749 338DC 189670 950 450 4,99 11,73 25572 94,69 35,27 786 438DC 252900 950 450 6,65 13,41 34097 99,24 46,86 824 Nm
SI @ 5,2 bar
rpm dm3 cm
2
kgm
2
4
8
16
29
35
66
97
127
65
124
183
242
187
340
493
646
Mounting Bolt
Circles
45°
9DC
(6) 0.531 (13.5) Ø Mounting
Holes Equally Spaced as
Shown on 11.125 (282.5) Bolt
Circle
13°
15DC
(6) 0.656 (16.7) Ø Mounting
Holes Based on 8 Equally
Spaced as Shown on 17.500
(444.5) Bolt Circle
25°
20DC
(12) 0.656 (16.7) Ø Mounting
Holes Equally Spaced as
Shown on 22.000 (558.8) Bolt
25°
25DC
(12) 0.656 (16.7) Ø Mounting
Holes Equally Spaced as
Shown on 28.750 (730.3) Bolt
kg 18.75
Notes:
 Tolerance +0.003/-0.000 in (+0,08/-0,00 mm)
 Dynamic torque shown. Static torque 15% greater. Maximum allowable
pressure 120 psi (8,3 bar).
 Maximum diameter of ”as cast“ surfaces.
 Absolute cylinder volume with new or worn friction linings.
 Some high torque applications of three and
four disc elements require additional sup
port on the cylinder side of the unit.
Contact your local Airflex representative for
more details.
 Based upon minimum bore.
 Basic part number only. Gear not included.
 Tolerance +0.000/-0.003 in (+0,00/-0,08 mm)
194
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
 American National Pipe Thread
38DBC
(16) 1.062 (27.0) Ø Mounting
Holes Equally Spaced as
Shown on 42.000 (1066.8) Bolt
Circle
Airflex® Type DC Elements
Dimensional Data
Section E
W4
H
O2
D44
J2
D46
J
H16
J1
D1
See Note on
pg. E-14
D31
English Dimensions in inches
109DC 209DC 115DC 215DC 120DC 220DC 320DC 420DC 125DC 225DC 325DC 425DC 138DC 238DC 338DC 438DC 146239 146240 146225 146226 146301 146317 146366 146390 146316 146355 146354 146389 146307 146336 146360 416388 415313 415510 415454 415454 415900 415959 416304 416472 416073 416074 416623 416477 416068 416069 416241 416461 Gear
Part Part
Size Number Number
1.75 1.88 2.75 3.44 3.31 4.25 4.88 5.38 4.38 5.50 6.25 6.25 6.75 8.50 9.25 8.50 2.38 2.38 3.98 3.94 5.63 5.69 5.56 5.69 7.13 7.13 6.88 6.88 10.50 10.25 9.75 10.25 Min. Max.
Bore
Range
1.75 3.25 2.88 4.38 3.00 5.63 8.25 12.50 3.50 7.00 9.31 12.00 5.00 9.00 13.00 18.00 5.63 7.63 7.00 9.00 8.00 11.50 14.63 16.25 9.50 12.00 14.50 18.00 13.50 16.50 19.50 25.00 0.25
0.25
0.38
0.38
0.75
0.00
0.00
0.00
0.75
0.38
0.00
0.00
1.25
0.00
0.00
0.00
SI Dimensions in millimeters
109DC 209DC 115DC 215DC 120DC 220DC 320DC 420DC 125DC 225DC 325DC 425DC 138DC 238DC 338DC 438DC 146239 146240 146225 146226 146301 146317 146366 146390 146316 146355 146354 146389 146307 146336 146360 146388 415313 415510 415454 415454 415900 415901 416304 416374 416073 416074 416623 416477 416068 416069 416241 416461 D1 W4 D46
Gear
Part Part
Size Number Number
44 48 70 87 97 108 124 137 111 140 159 159 171 216 235 216 60 60 98 100 143 143 141 145 181 181 175 175 267 260 248 260 Min. Max.
Bore
Range
44 83 73 111 76 143 210 277 89 178 236 305 127 229 330 457 143 194 178 229 203 292 372 413 241 305 368 457 343 419 495 635 6
6
10
10
19
0
0
0
19
10
0
0
32
0
0
0
D1 W4 D46
English Dimensions in inches
9DC 15DC 20DC 25DC 38DC 1.00 1.47 1.50 1.75 2.45 0.25 0.38 0.38 0.25 0.25 3.25 6.00 8.50 11.50 16.50 3
3
3
4
4
Size D31 D44 H16 H
J J1 J2 O2 
No. 3
3
3
4
4
308,0 466,7 590,6 778,0 1136,7 9DC 25 6
83 15DC 37 10 152 20DC 38 10 216 25DC 44 6
292 38DC 62 6
419 SI 1/4-20NC-2 3/8-16NC-2 3/8-16NC-2 3/8-16NC-2 1/2-13NC-2 Size 1/4-20NC-2 3/8-16NC-2 3/8-16NC-2 3/8-16NC-2 1/2-13NC-2 3.50 6.50 9.13 12.25 17.50 Bolt Circle
89 165 232 311 445 12.125 18.375 23.250 30.630 44.750 8.375 14.375 18.250 24.375 36.375 212,7 365,1 463,5 619,1 923,9 12.37 18.94 23.82 30.58 44.86 314 481 605 777 1139 3/8-14
1/2-14
1/2-14
1/2-14
3/4-14
3/8-14
1/2-14
1/2-14
1/2-14
3/4-14
Dimensions in millimeters
Notes are on page E - 14
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
195
Airflex® FHB Brake Elements
Section E
Overview
Eaton Airflex has introduced a revolutionary new design in
disc brake technology called the Floating Housing Brake
(FHB). The spring applied (power off), air-cooled disc brake
is well suited for applications in Surface Mining, Oilfield and
other heavy-duty industrial machinery designs.
The FHB is an air cooled spring applied brake with exceptional
friction life and rapid friction replacement capability. It is supplied with long wearing, organic friction material and a rugged
solid cast, rotating disc that provides lower inertia than typical
caliper brakes.
Features
• Rated for over 430,000 lb-in of torque
• Patented braking concept uses a floating housing instead of a floating rotor
• Multiple brake installation designs exist for industry leading motors
• Fixed hub and rotor design
Benefits
• Ability to quickly change the friction pads reduces down time on dragline from 3 hours to 1 hour
• Reduced maintenance cost with elimination of spline tooth or gear wear
• Longer friction pad wear life due to a full 360° annular disc
• Faster and safer installation with exclusive shaft lock
assembly for ease of mounting and removal
• Virtually no wear during free wheeling, allows high product life
196
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
Airflex® FHB Brake Elements
Section E
Technical Introduction
The FHB brake is offered for applications with non-cyclic
brake engagement that require higher speed operation or precise balance of the rotating components is required. It uses
a solid rotor and stationary friction material to develop equal
torque in either direction of rotation. The disc is mounted on
the shaft which is to be stopped while the brake assembly
is attached to the machine frame. Pressurizing the brake
compresses the brake springs and withdraws the clamping
force from the brake disc so the shaft can rotate freely. As
air pressure is exhausted, the springs force the pressure plate
towards the mounting flange and the spring housing which in
turn forces the floating plate away from the mounting flange,
clamping the disc and the friction pad assembly.
Typical Applications
Draglines
Electric Shovels
Winches
HoistHoist
DragCrowd
SwingSwing
Propel (Walk)
Propel
No. of
Length
Dynamic Torque* Max Length Engaged
Spring
Released
Size
RPM
Sets
lb-in
N-m
in.
mm.
in.
mm.
138FHB
36
432,900 48,918
950
18.24 463.3 18.48 469.39
*Dynamic torque calculated based on 36 sets of springs, static torque is approximately
15% more. Torque in each application is dependent on number of spring sets.
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
197
Airflex® FHB Brake Elements
Section E
Typical Applications
Item
Qty.
*2
1
3
1
*41
5
1
6
1
7
1
*8
1
9
16
10
16
11
16
12
8
13
8
14
8
15
8
16
8
Typical Applications
Description
Part Number
Item
Qty.
Description
Part Number
Mounting Flang
Floating Plate
Disc
Pressure Plate
Spring Housing
Cylinder
B-Loc
Friction Linning S/A
Flanged Bolt
Metric Shoulder Screw
Main Stud
Clamp Tube
Support Stud
Spacer
Plain Washer
515532
515503
515536
515505
515507
515509
417385-02
308589
308602
308593
308601-01
308586-01
308592-01
308590-01
000067X0063
17
18
19
20
21
22
**23
**24
25
26
27
28
29
30
31
8
4
8
8
2
2
36
36
12
8
8
8
8
8
8
Nut
Return Spring
Plain Washer
Nut
Lip Seal
Lip Seal
Inner Apply Spring
Outer Apply Spring
Spring Retainer
FP Bush
PP Bush
SH Bush
Power Head Spacer
Plain Washer
Screw
000414X0013
416751-04
000067X0065
000414X0004
000402X0005
000402X0006
416751-08
416751-07
415635
204214-01
204214-02
204214-03
308599-01
000067X0064
000391X3602
*Part number may vary - depending on application
**Quantity may vary - depending on application requirements
198
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
Airflex® FHB Brake Elements
138FHB Specifications and Dimensions Illustrated
Section E
21
*
52.5
* Consult factory for alternate mounting options.
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
199
Airflex® Brake Selection Procedure
Section E
Torque and Thermal Capacities
No. of
Friction Discs
Pressure pp
General
1
2
3
4
psi 3
4
5
6
Technical Section Y of the catalog contains useful information
pertaining to the selection, mounting, alignment and control
of clutches and brakes in general. Formulas, symbols and
units are also identified. It is recommended that Section Y be
reviewed before attempting to size a specific product for an
application.
DBA and DBB Brakes
The torque ratings are dependent upon spring force and
quantity, not a pressurizing medium. However, a pressurizing
medium is required to compress the springs to release the
brake. Minimum releasing pressures, as well as the maximum pressures which the piston and cylinder can withstand,
are given on the catalog pages.
Type DBA and DBB brakes are disc type and develop equal
torque in both directions of rotation. Several springs are used
in their design. If brake size is determined by thermal requirements rather than torque requirements, brake torque can be
reduced by spring removal.
For spring applied brakes, torque will decrease with lining
wear, due to the longer piston travel required for engagement. Single disc DBA and DBB brakes have no provision for
adjustment. Multiple disc brakes have a provision for adjustment after a given amount of lining wear. Therefore, DBA and
DBB brake torque with worn linings must be considered in
the selection process.
DC Elements
DC element dynamic torque ratings Mr, are based on an
effective pressure pr of 75 psi (5,2 bar). Maximum allowable
operating pressure is 120 psi (8,3 bar). Torque ratings must
be adjusted for operating pressure po and parasitic loss pp.
The elements have an inherent parasitic pressure pp, required
to cause friction disc engagement, which represents the
pressure to overcome internal sliding friction and to compress
disc releasing springs.
200
Element torque is calculated from:
Me =
Torque
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
bar
0,21
0,28
0,34
0,41
p o − pp
pr
⋅ Mr
Cyclic and Non-Cyclic Thermal Capacity
Brake types DBAV and DBB were designed for cyclic stopping applications. They are capable of a maximum thermal
capacity Pc of 0.012 HP/in2.
Non-cyclic thermal capacity is determined by the element's
friction area, drum or disc mass, material heat capacity and
thermal conductivity. The properties of our standard elements
result in the limits indicated in the Non-Cyclic Energy Capacity
Graph. An explanation on the use of this graph follows.
The thermal energy calculated for the load is adjusted to
include the energy associated with accelerating or decelerating the components of the tentative clutch and/or brake
selection. The adjusted thermal energy Wt is divided by the
element's friction area A. Next, the average power loading
Pave is calculated from:
Pave =
Pt
A
The point (Wt/A, Pave) is plotted on the graph. If the point falls
below the appropriate product limit line, the selection will
handle the load. If it does not, an element having a greater
friction area is required.
Airflex® Selection Procedure
W1/A (joule/cm2)
W1/A (ft·lb/in 2)
Section E
Pave (HP/in2)
Non-Cylic Energy Capacity
Pave (kW/cm2)
Example
Reverse brake torque required =
A cyclic stopping brake is required for use on a power press
operating under the following conditions. Determine the
brake size and allowable cyclic rate.
0.5·stroke·weight/reduction
Brake shaft speed: 300 rpm
Stopping angle at crankshaft: 15°
Inertia referred to brake shaft: 750 lb·ft2
Press stroke: 10 in
Ram and die weight: 2500 lb
Reduction between brake shaft and crankshaft: 10:1
Stopping angle at brake shaft 0d = 15°·10 = 150°
0
0 d 150
=
= 0.17sec.
3 ⋅ n 3 ⋅ 300
Wk 2 ⋅ n
750 ⋅ 300
Mb =
=
25.58 ⋅ t d 25.58 ⋅ 0.17
td
=
= 51,700 lb·in
= 0.5·10·2500/10
= 1250 lb·in
From required torques, select 215DBB
Lining area = 476 in2
Disc and gear WK2 = 10 lb·ft2
Total WK2 = 750 + 10 = 760 lb·ft2
W k 2 ⋅ n2 760 ⋅ 3002
W=
=
5873
5873
= 11650 ft·lb
W ⋅ cpm
33000
P ⋅ 33000
cpm = c
W
0.012 ⋅ 476 ⋅ 33000
=
11650
= 16
Pc =
EATON Airflex® Clutches & Brakes 10M1297GP November 2012
201