Flexible shaft couplings

5 Gear couplings

15 Disc couplings

23 Elastic couplings

26 Greases for gear/grid shaft couplings

27 SKF hydraulic fitting solution

28 Other types of flexible couplings

29 Other products

30 SKF – the knowledge engineering company

The SKF® brand now stands for more than ever before, and means more to you as a valued customer.

While SKF maintains its leadership as the hallmark of quality bearings throughout the world, new dimensions in technical advances, product support and services have evolved SKF into a truly solutions-oriented supplier, creating greater value for customers.

These solutions encompass ways to bring greater productivity to customers, not only with breakthrough application-specific products, but also through leading-edge design simulation tools and consultancy services, plant asset efficiency maintenance programmes, and the industry’s most advanced supply management techniques.

The SKF brand still stands for the very best in rolling bearings, but it now stands for much more.

SKF – the knowledge engineering company

Contents

2

SKF has considerable knowledge of shaft couplings, resulting mainly from extensive experience gained in solving power transmis-sion problems where shafts are supported in rolling bearings. It is therefore natural that shaft couplings should be included in the range of products marketed.

The SKF range of flexible shaft couplings comprises standard couplings for pumps, fans, etc. and also sophisiticated couplings such as those used in rolling mill applications.

If the type of coupling required is not shown in this catalogue, SKF should be consulted for information. Almost every coupling problem can be solved by one of the products in the SKF range.

SI units are used in this catalogue; relevant conversion factors are given below.

Foreword

Conversion factors

Length1 mm = 0,03937 in1 in = 25,4 mm

Mass1 kg = 2,205 lb1 lb = 0,4536 kg

Force1 N = 0,225 lbf1 lbf = 4,45 N

Torque1 Nmm = 0,00885 in.lbf1 Nm = 8,85 in.lbf1 lbf.in = 113 Nmm = 0,113 Nm1 lbf.ft = 1356,23 Nmm = 1,35623 Nm

Power1 W = 0,00136 HP1 hp = 736 W

3

Gear couplings

Gear couplings are torsionally rigid and are supplied to two designs – completely flexible and flexible/rigid. A completely flexible coup-ling comprises two hubs with an external gear and two outer sleeves with an internal gear. It’s a universal coupling for all sorts of applications and accommodates all possible misalignments (angular, offset and combined) as well as large axial moments. Machines, bearings, seals, and shafts are therefore not subjected to the additional forces, sometimes of considerable magnitude, which arise from unavoidable misalignment usually associated with rigid shaft couplings.

A flexible/rigid coupling comprises one flex-ible geared half and one rigid half. It does not accommodate parallell displacement of shafts but does accommodate angular misalignment. This type of couplings are primarily used for “floating shaft” applications.

Sizes 010 – 070 all have crowned teeth with a 20° pressure contact († fig. 1). This enables to accommodate up to 1,5° static an-gular misalignment per gear mesh. However, minimizing the operational misalignment will maximize the life of the coupling as well as the life of other machinery components such as bearings etc.

Each sleeve flange is supplied with two pipe plugs 180° apart. This permits assembly of a full flex-coupling with four lubrication plugs positioned every 90° apart, to facilitate lubri-cation († fig. 2).

A Buna-N “O” ring is fitted to the outer sleeve, to retain grease and exclude contam-inants († fig. 3).

A straight faced tooth form is used for the sizes 080 to 300 († fig. 4). They are designed to accommodate 0,5° misalignment per gear mesh. These sizes are also equipped with a removable end ring for ease of assembly and to allow inspection of the gear teeth.

KSG grease is recommended in order to obtain maximum operating life. See page 26 for further information.

Fig. 1 Fig. 2

Fig. 3 Fig. 4

5

T

B

G O A

KN

ECC CW CL

E

Completely flexible gear-type couplings with crowned teeth

These couplings accommodate a total misalignment of up to 3°. Where the misalignment is larger than 1,5°, however, SKF should be consulted. The coup-lings can withstand start-up peak moments of two times the stated continuous torque.

By reversing one or both of the hubs, the same coupling can be used for different shaft end separ-ations.

These couplings have efficient O-ring seals and should be lubricated with grease.

Shaft Torque Speed Mass Designation3)

diameter Continuous Undrilled hubs min max1) max max2)

mm Nm r/min kg –

16 42 850 10 000 4 HCCE 010 R

16 58 1 900 7 400 9 HCCE 015 R

25 73 3 600 5 900 15 HCCE 020 R

28 95 6 500 5 000 26 HCCE 025 R

33 110 11 500 4 300 39 HCCE 030 R

47 127 16 900 3 900 62 HCCE 035 R

68 150 26 900 3 500 92 HCCE 040 R

80 166 36 300 3 200 122 HCCE 045 R

86 186 50 300 2 900 176 HCCE 050 R

97 206 66 200 2 700 239 HCCE 055 R

100 228 86 600 2 500 290 HCCE 060 R

120 275 132 400 2 200 444 HCCE 070 R

1) Valid for keyways to SMS 2305/DIN 6885/12) Where higher speeds are required, please consult SKF3) The suffix R in the designation indicates a pre-drilled shaft bore. For finished worked shaft bores, the sufix R

should be replaced by suffix F and the required dimensions and tolerances for the bore and keyway

66

T

B

G O A

KN

ECC CW CL

E

T

B

G O A

KN

ECC CW CL

E

Dimensions

A B CC CL CW1) E G KN O T

min max

mm

116 78 3 5 3 10 43 78 6 60 14

152 90 3 8 3 16 49 100 6 79 19

178 119 3 14 3 29 62 125 4 102 19

213 137 5 12 5 22 77 149 11 124 22

240 167 5 23 5 44 91 175 10 143 22

279 195 6 27 6 52 106 201 12 165 29

318 222 6 32 6 62 121 235 13 197 29

346 246 8 37 8 70 135 264 16 216 29

389 281 8 50 8 97 153 294 17 241 38

425 316 8 53 8 105 175 322 21 267 24

457 338 8 60 8 117 188 352 23 292 25

527 391 10 71 10 141 221 408 30 343 29

Both hubs reversedOne hub reversed

1) Distance can vary from min to max and anything in between

77

Flexible/rigid gear-type couplings with crowned teeth

These couplings comprise one flexible coupling half, type HCCE, and one rigid coupling half.

The couplings accommodate a total misalign-ment of up to 1,5°. Where the misalignment is greater than 0,75°, however, SKF should be con-sulted. The couplings can withstand start-up peak moments of two times the stated continuous torque.

By reversing the geared hub, the same coupling may be used for different shaft end separations.

These couplings should be lubricated with grease.

Shaft diameter Torque Speed Mass Designation3)

Flexible half Rigid half Continuous Undrilled hubs

min max1) min max1) max max2)

mm Nm r/min kg –

16 42 15 59 850 10 000 4 HCRE 010 R

16 58 19 71 1 900 7 400 9 HCRE 015 R

25 73 35 88 3 600 5 900 15 HCRE 020 R

28 95 36 110 6 500 5 000 26 HCRE 025 R

33 110 49 133 11 500 4 300 40 HCRE 030 R

47 127 62 152 16 900 3 900 64 HCRE 035 R

68 150 74 173 26 900 3 500 92 HCRE 040 R

80 166 84 197 36 300 3 200 124 HCRE 045 R

86 186 90 225 50 300 2 900 179 HCRE 050 R

97 206 103 212 66 200 2 700 220 HCRE 055 R

100 228 116 230 86 600 2 500 267 HCRE 060 R

120 275 116 266 132 400 2 200 414 HCRE 070 R

1) Valid for keyways to SMS 2305/DIN 6885/12) Where higher speeds are required, please consult SKF3) The suffix R in the designation indicates a pre-drilled shaft bore. For finished worked shaft bores, the suffix R

should be replaced by suffix F and the required dimensions and tolerances for the bore and keyway

Flex-rigid couplings are typically used on floating shaft arrangements

88

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Dimensions

A B CC CL1)

E ER G GR KN O T min max

mm

116 81 4 3 6 43 40 78 76 6 60 14

152 94 4 3 9 49 47 100 95 6 79 19

178 120 4 3 15 62 58 125 121 4 102 19

213 144 5 4 12 77 74 149 146 11 124 22

240 174 5 4 23 91 88 175 171 10 143 22

279 202 6 4 26 106 102 201 197 12 165 29

318 229 8 6 33 121 113 235 229 13 197 29

346 256 9 6 38 135 129 264 257 16 216 29

389 290 9 6 51 153 144 294 287 17 241 38

425 340 9 8 55 175 175 322 273 21 267 24

457 364 9 8 62 188 188 352 292 23 292 25

527 424 11 9 74 221 221 408 340 30 343 29

1) Distance can vary from min to max and anything in between

Hub reversed

99

Completely flexible gear-type couplings with straight-cut teeth

These couplings accommodate a total misalignment of 1° and can withstand start-up peak moments of two times the stated continuous torque.

The seals consist of separate steel covers, which are bolted on during mounting; gear inspection is therefore simplified. They centre the outer sleeves on the hubs and are so designed that a large space for the lubricant is available. These couplings shall be lubricated with grease.

Shaft Torque Speed Mass Designation3)

diameter Continuous Undrilled hubs

min max1) max max2)

mm mm Nm r/min kg –

127 279 158 700 1 750 649 HCCE 080 R

127 311 225 400 1 625 907 HCCE 090 R

153 349 310 100 1 500 1 211 HCCE 100 R

178 394 411 900 1 375 1 597 HCCE 110 R

203 438 512 100 1 250 2 019 HCCE 120 R

203 457 642 700 1 125 2 454 HCCE 130 R

– – – – – HCCE 140 R

– – – – – HCCE 150 R

– – – – – HCCE 160 R

– – – – – HCCE 180 R

– – – – – HCCE 200 R

– – – – – HCCE 220 R

– – – – – HCCE 240 R

– – – – – HCCE 260 R

– – – – – HCCE 280 R

– – – – – HCCE 300 R

Information on request for remaining sizes.1) Valid for keyways to SMS 2305/DIN 6885/12) Where higher speeds are required, please consult SKF3) The suffix R in designation indicates a pre-drilled shaft bore. For finished worked shaft bores, the suffix R

should be replaced by suffix F and the required dimensions and tolerances for the bore and keyway4) For above mentioned couplings hydraulic fitting is recommended

B

O A

KN

CC

KN

E E

1010

Dimensions

A B CC CL CW E O KN

mm

591 496 10 141 273 249 357 6,35

660 552 13 159 305 276 394 6,35

711 610 13 181 349 305 445 6,35

775 666 13 200 387 333 496 6,35

838 705 13 206 400 352 546 6,35

908 750 19 214 410 371 584 6,35

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

– – – – – – – –

A

CL CW

One hub reversed Both hubs reversed

1111

Shaft diameter Torque Speed Mass Designation3)

Flexible half Rigid half Continuous Undrilled hubs

min max1) min max1) max max2)

mm Nm r/min kg

127 279 127 292 158 700 1 750 667 HCRE 080 R

127 311 165 337 225 400 1 625 889 HCRE 090 R

153 349 191 362 310 100 1 500 1 234 HCRE 100 R

178 394 203 400 411 900 1 375 1 597 HCRE 110 R

203 438 203 438 512 100 1 250 2 019 HCRE 120 R

203 457 203 483 642 700 1 125 2 486 HCRE 130 R

– – – – – – – HCRE 140 R

– – – – – – – HCRE 150 R

– – – – – – – HCRE 160 R

– – – – – – – HCRE 180 R

– – – – – – – HCRE 200 R

– – – – – – – HCRE 220 R

– – – – – – – HCRE 240 R

– – – – – – – HCRE 260 R

– – – – – – – HCRE 280 R

– – – – – – – HCRE 300 R

Flexible/rigid gear-type couplings with straight-cut teeth

These couplings comprise one flexible coupling half, type HCCE, and one rigid coupling half.

The couplings accommodate a total misalign-ment of 0,5° and can withstand start-up peak mo-ments of two times the stated continuous torque.

These couplings shall be lubricated with grease.

Information on request for remaining sizes1) Valid for keys to SMS 2305/DIN 6885/12) Where higher speeds are required, please consult SKF3) The suffix R in designation indicates a pre-drilled shaft bore. For finished worked shaft bores, the suffix R

should be replaced by suffix F and the required dimensions and tolerances for the bore and keyway4) For above mentioned couplings hydraulic fitting is recommended

1212

Dimensions

A CC E GR B KN

mm

591 13 249 387 505 6,35

660 14 276 438 576 6,35

711 16 305 483 619 6,35

775 16 333 527 676 6,35

838 16 352 575 714 635

908 19 371 625 756 6,35

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

A

KNB

GR

CCE E

1313

Disc couplings

KD disc couplings provide reliable transmis-sion of mechanical power from driving to driven machine where low maintenance, non-lubricated couplings are required.

KD disc couplings are specifically designed to accommodate general purpose drive sys-tem applications such as centrifugal pumps, generators, cooling towers, machine tools, printing, and pulp and paper machines.

The coupling transmit torque and accom-modate both angular, offset and axial mis-alignment between shafts, with a coupling comprised of shaft mounted hubs connected through flexible disc packs with spacer or sleeve assemblies.

All covered disc couplings use stainless steel discs as flexible members, providing high strength and good corrosion resistance. Each disc pack accommodates up to 0,5° continuous angular misalignment and can withstand start-up peak moments of two times the stated torque († product tables). The streamline design makes sure that the reac-tion load on equipment bearings is minimized. These disc couplings are inherently self- centring: additional provision for limited end float is not required.

All disc packs are unitized and along with self-locking nuts, they greatly reduce the number of loose parts, thus simplifying instal-lation and replacement.

On the next pages the most common disc coupling types can be found. For higher torque capacity, floating shaft applications, vertical installation etc., consult SKF.

15

Spacer disc couplings

The KD21 couplings are designed for medium and heavy-duty applications requiring moderate shaft separations. The minimal number of com-ponents yields an economical disc coupling solu-tion to spacer applications. The larger sizes avail-able in the KD21 series allow application to larger, high power machines.

AGMA Class 9 is standard, as manufactured.

Shaft Torque Speed Mass1) WR2 Axial Designationdiameter Continuous Total1) capacity

min max max max

mm Nm r/min kg kgm2 mm –

16 44 450 18 200 3,54 0,005 ±2,0 KD21-103 19 64 1 540 14 800 8,03 0,020 ±3,6 KD21-153 26 76 4 070 13 000 13,5 0,047 ±2,8 KD21-204 26 95 5 880 11 200 20,1 0,098 ±3,6 KD21-254 38 114 10 160 9 900 32,0 0,218 ±4,3 KD21-304 51 127 16 950 8 800 53,1 0,481 ±5,1 KD21-354 64 140 24 300 7 800 80,3 0,923 ±5,7 KD21-404 77 162 28 820 7 200 93,0 1,28 ±6,4 KD21-454 – 178 40 670 6 600 138 2,19 ±7,0 KD21-504 – 197 57 070 6 100 182 3,46 ±7,6 KD21-554 – 216 74 600 5 600 232 5,22 ±8,1 KD21-604 – 273 170 630 4 500 418 14,7 ±6,9 KD21-705 – 305 261 030 4 000 612 27,5 ±7,9 KD21-805 – 343 293 800 3 600 771 42,8 ±10 KD21-905

1) Data based on min. “C” dimensions and maximum bore

1616

Dimensions Stock “C” dimension (mm) 89 127 178 203 229 254 305 356A C1) E G NO NI min

mm –

100 70 42 65 57 51 ¥ ¥ – – – – – – 137 86 49 90 76 68 – ¥ – – – – – – 162 99 60 110 99 86 – ¥ ¥ – ¥ ¥ ¥ – 194 99 76 136 134 114 – ¥ ¥ – ¥ – – ¥ 229 121 90 156 140 127 – – ¥ – ¥ – – ¥ 267 146 105 178 159 140 – – ¥ – ¥ – – ¥ 298 168 117 201 178 159 – – – ¥ – – – ¥ 324 168 133 224 203 184 – – – ¥ – – – – 353 191 149 244 222 197 – – – – – – – – 384 219 182 266 235 210 – – – – – – – – 419 232 195 288 254 222 – – – – – – – – 521 276 229 357 311 264 – – – – – – – – 584 330 257 400 249 292 – – – – – – – – 648 330 300 454 403 359 – – – – – – – –

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1) Dimension C is a variable distance, specify if other distance is required

1717

Spacer “drop-out” disc couplings

The KD2 coupling is designed for medium-duty applications requiring moderate shaft separations, and specifically engineered to meet API 610 specifi-cations for industrial pump couplings. The factory assembled flexible centre section installs or drops out as one unit. AGMA Class 9 is standard, as manu-factured.

Shaft Torque Speed Mass1) WR2 Axial Designationdiameter Continuous Total1) capacity

min max max

mm Nm r/min kg kgm2 mm –

13 44 230 8 200 3,49 0,005 ±1,4 KD2-0532)

13 48 310 17 000 4,49 0,006 ±1,5 KD2-103 19 73 890 14 200 10,5 0,027 ±1,9 KD2-153 25 83 1 630 12 800 16,1 0,060 ±2,3 KD2-203 25 102 2 670 11 500 26,7 0,139 ±2,7 KD2-253 38 121 4 270 10 000 40,6 0,290 ±3,2 KD2-303 51 140 7 120 8 500 65,8 0,633 ±3,8 KD2-353 64 159 11 040 7 500 99,8 1,26 ±4,4 KD2-403 77 184 14 580 7 000 118 1,81 ±5,1 KD2-453

1) Data based on min. “C” dimensions and maximum bore2) The size 053 does not use the piloted and pre-assembled flexible centre section

1818

100 76 41 65 – – ¥ – – –

109 89 38 67 ¥ ¥ ¥ ¥ – –

145 111 51 105 – ¥ ¥ ¥ – –

171 122 57 121 – – ¥ ¥ – –

203 146 73 146 – – – ¥ ¥ –

235 165 86 171 – – – ¥ ¥ –

273 194 102 197 – – – – ¥ ¥

337 229 113 229 – – – – – ¥

337 229 122 257 – – – – – ¥

Dimensions Stock “C” dimension (mm) 89 111 127 178 203 229A C1) E G min

mm –

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1919

Close coupled disc couplings

The KD10 coupling is designed to work in place of standard close coupled gear couplings. The power capacity of the KD10 coupling is the highest in the industry, allowing the easiest conversion from a lubricated coupling to a low maintenance disc coupling.

The split spacer simply drops away from the hubs for faster installation and replacement of disc packs without moving connected machinery. Meets AGMA Class 8 as manufactured.

Shaft Torque Speeds Mass1) WR2 Axial Designationdiameter Continuous Not balanced Balanced Total1) capacity

min max max max max

mm Nm r/min kg kgm2 mm –

16 38 452 5 400 9 700 3,13 0,005 ±2,0 KD10-103 19 54 1 540 4 500 7 500 7,94 0,021 ±2,6 KD10-153 26 67 4 070 4 100 6 700 12,3 0,043 ±2,8 KD10-204 26 83 5 880 3 600 5 600 21,4 0,117 ±3,6 KD10-254 38 95 10 060 3 200 5 100 35,4 0,268 ±4,3 KD10-304 51 108 16 390 2 900 4 400 60,8 0,627 ±5,1 KD10-354 64 121 24 300 2 600 4 000 87,5 1,13 ±5,7 KD10-404 77 140 28 800 2 400 3 800 104 1,62 ±6,4 KD10-454 – 146 40 680 2 200 3 500 143 2,53 ±7,0 KD10-504 – 159 57 070 1 900 3 000 183 3,84 ±7,6 KD10-554 – 171 74 580 1 850 2 900 254 6,50 ±8,1 KD10-604 – 216 170 630 1 800 2 800 420 16,5 ±6,9 KD10-705 – 241 237 300 1 600 2 500 608 29,9 ±7,9 KD10-805 – 292 259 900 1 500 2 300 771 47,8 ±10 KD10-905

1) Data based on maximum bore

2020

Dimensions

A B B1 CC1) CL

1) D E G

mm

100 89 125 3 40 10 43 53 137 111 156 3 48 13 54 75 162 143 201 3 61 15 70 92 194 159 221 5 68 15 77 116 229 187 262 5 79 19 91 133 267 229 319 6 97 22 111 150 298 270 376 6 113 25 132 171 324 278 389 8 119 25 135 194 353 314 441 8 134 29 153 208 384 259 504 8 153 33 176 222 419 384 539 8 163 35 188 236 521 451 632 10 191 42 221 288 584 508 711 10 213 49 249 324 648 565 794 13 241 49 276 387

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One hub reversed

1) Dimensions CC and CL are variable distances, specify if other distances are required

2121

Elastic couplings

Elastic couplings of the elastomeric type incorporate a pre-compressed rubber com-ponent, which provides extra strength and long life. These couplings cater for all types of misalignment. The hubs are made of high-strength aluminium alloy, making the coupling light and corrosion resistant. The rubber com-ponent damps shocks and provides smooth, quiet power transmission, thus protecting both the driving and the driving machines.

Mounting is very simple. As the rubber component is a split insert, it can be mounted after the shafts have been aligned.

23

Completely flexible, elastic couplings

These couplings accommodate a total misalignment of 1° and can withstand start-up peak moments of two times the stated continuous torque.

By reversing one or both of the hubs, the shaft coupling can be used for different shaft end separ-ations.

Shaft Torque Speed Mass Designation3)

diameter Continuous Undrilled hubs min max1) max max2)

mm Nm r/min kg –

14 33 25 4 100 0,8 ECCN 020 R

14 39 47 4 100 1 ECCN 030 R

14 50 82 4 100 3 ECCN 040 R

20 55 140 4 100 4 ECCN 050 R

28 78 220 4 100 6 ECCN 060 R

31 81 510 3 600 8 ECCN 070 R

36 107 930 2 800 14 ECCN 080 R

43 130 1 600 2 000 27 ECCN 090 R

55 147 3 000 1 800 44 ECCN 100 R

1) Valid for keyways to SMS 2305/DIN 6885/12) Where higher speeds are required, please consult SKF3) The suffix R in the designation indicates a pre-drilled shaft bore. For finished worked shaft bores, the sufix R

should be replaced by suffix F and the required dimensions and tolerances for the bore and keyway

2424

Dimensions

A BC BW CC CW E F L O R

mm

94 57 79 3 25 27 15,9 25 48 102

111 70 105 3 38 33 15,9 38 62 117

137 92 130 3 41 44 25 41 70 144 154 105 156 3 54 51 25 54 79 171 178 105 156 3 54 51 25 54 107 194 203 111 168 3 60 54 25 60 113 221 240 140 213 3 76 68 32 76 143 267 308 181 283 3 105 89 38 105 168 332 352 206 308 3 105 102 51 105 187 384

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Both hubs reversed

2525

Greases for gear/grid shaft couplings

Coupling greases, unlike bearing or general purpose grease, must withstand the centri-fugal forces created by a rotating coupling. These greases – KSG and KHP – are specific-ally formulated to resist the heavy centrifugal forces associated with all applications. These forces can cause the all-important base oil to separate from the soap thickeners and addi-tives. Unlike greases with lithium-based thickeners, KSG and KHP greases use poly-ethylene thickeners, with a density closer to that of the base oil, and therefore much less susceptible to separation.

KSG grease is intended for speeds up to 3 600 r/min and KHP is best suited for speeds above 3 600 r/min.

KSG standard coupling greaseKSG is an NLGI Grade 1 coupling grease with EP additives for use in any grease-packed coupling, such as gear, grid and chain-type couplings, in standard industrial service. Su-perior to commonly available greases adapted to coupling use, KSG was developed specifi-cally as a coupling lubricant.

KHP high performance coupling greaseKHP is an NLGI Grade 1 grease with EP addi-tives which exceeds the design requirements needed for extended operating and relubrica-tion intervals. KHP grease is recommended for high-speed grease lubricated gear cou-plings in petrochemical, process, and utility industries.

Minimum requirements for other greases– NLGI 1 (speeds below 300 r/min,

NLGI 0 or 00).– Max. 13 % soap.– Min. base oil viscosity 600 cSt at 40 °C.– The soap in the grease must not separate

from the base oil due to centrifugal forces.

26

SKF oil injection method applied to flexible shaft couplingsBy combining the principle of SKF oil injection method on flexible shaft couplings, you re-ceive a high torque interference fit for plain, cylindrical shafts.

Since there is no need for machining any keyways, splines or tapered shafts, you can design for smaller shaft diameter = less weight.

Mounting and dismounting are fast and easy with no external tools except a pump set.

PrincipleThe coupling works on the same principle as the SKF OK couplings, i.e a thicker outer sleeve (in this case the flex coupling hub) with an internal taper is driven up on a thin, exter-nally tapered inner sleeve. Oil is then injected between the sleeves in order to virtually elim-inate friction between the tapered surfaces. The couplings then have an inbuilt hydraulic unit which creates an oil pressure thus driving up the flex hub on the inner sleeve.

Contact us for further information.

SKF hydraulic fitting solution

27

Other types of flexible couplings

Disc coupling for floating shaft application

Gear coupling with lifetime all-metal end rings. Largest lubricant capacity

Gear coupling designed for applications that require large amount of slide

Grid coupling for all types of applications

High resilient coupling

High performance coupling

Gear spindle coupling

Spacer coupling

Vertical couplingDouble flex elastomer resilient coupling with composite spacer

For other types of couplings, please contact us.28

SHT/SHRMechanical friction joint from SKF, eliminating need for keyways

OKC/OKFHydraulic rigid couplings from SKF

SGBHydraulic bolt from SKF

Nitride hardened spiral bevel gears

Other products

29

Evolving by-wire technology SKF has a unique expertise in fast-growing by-wire technology, from fly-by-wire, to drive-by-wire, to work-by-wire. SKF pioneered practical fly-by-wire technology and is a close working partner with all aerospace industry leaders. As an example, virtually all aircraft of the Airbus design use SKF by-wire systems for cockpit flight control.

SKF is also a leader in automotive by-wire tech-nology, and has partnered with automotive engin-eers to develop two concept cars, which employ SKF mechatronics for steering and braking. Further by-wire development has led SKF to produce an all-electric forklift truck, which uses mechatronics rather than hydraulics for all controls.

SKF – the knowledge engineering company

From the company that invented the self-aligning ball bearing 100 years ago, SKF has evolved into a knowledge engineering com-pany that is able to draw on five platforms to create unique solutions for its customers. These platforms include bearings, bearing units and seals, of course, but extend to other areas including: lubricants and lubrication systems, critical for long bearing life in many applications; mechatronics that combine mechanical and electronics knowledge into systems for more effective linear motion and sensorized solutions; and a full range of ser-vices, from design and logistics support to con-ditioning monitoring and reliability systems.

Though the scope has broadened, SKF continues to maintain the world’s leadership in the design, manufacture and marketing of rolling bearings, as well as complementary products such as radial seals. SKF also holds an increasingly important position in the mar-ket for linear motion products, high-precision aerospace bearings, machine tool spindles and plant maintenance services.

The SKF Group has global ISO 14001 en-vironmental certification. Individual divisions have been approved for quality certification in accordance with either ISO 9000 or QS 9000.

With some 100 manufacturing sites world-wide and sales companies in 70 countries, SKF is a truly international corporation. In ad-dition, our distributors and dealers in some 15 000 locations around the world, an e-business marketplace and a global distribu-tion system put SKF close to customers for the supply of both products and services. In essence, SKF solutions are available wherever and whenever customers need them. Overall, the SKF brand and the corporation are stronger than ever. As the knowledge engin-eering company, we stand ready to serve you with world-class product competencies, intellectual resources, and the vision to help you succeed.

Bearings and unitsSeals Lubrication

systems

Mechatronics Services

© Airbus – photo: exm company, H. Goussé

30

Developing a cleaner cleanerThe electric motor and its bearings are the heart of many household appliances. SKF works closely with appliance manufacturers to improve their products’ per-formance, cut costs, reduce weight, and reduce energy consumption. A recent example of this cooperation is a new generation of vacuum cleaners with sub-stantially more suction. SKF knowledge in the area of small bearing technology is also applied to manufacturers of power tools and office equipment.

Harnessing wind powerThe growing industry of wind-generated electric power provides a source of clean, green electricity. SKF is working closely with global industry leaders to develop efficient and trouble-free turbines, providing a wide range of large, highly specialized bearings and condition monitoring systems to extend equipment life of wind farms located in even the most remote and inhospitable environments.

Working in extreme environmentsIn frigid winters, especially in northern countries, extreme sub-zero tempera-tures can cause bearings in railway axleboxes to seize due to lubrication starva-tion. SKF created a new family of synthetic lubricants formulated to retain their lubrication viscosity even at these extreme temperatures. SKF knowledge enables manufacturers and end user customers to overcome the performance issues resulting from extreme temperatures, whether hot or cold. For example, SKF products are at work in diverse environments such as baking ovens and instant freezing in food processing plants.

Maintaining a 350 km/h R&D labIn addition to SKF’s renowned research and development facilities in Europe and the United States, Formula One car racing provides a unique environment for SKF to push the limits of bearing technology. For over 50 years, SKF products, engineering and knowledge have helped make Scuderia Ferrari a formidable force in F1 racing. (The average racing Ferrari utilizes more than 150 SKF com-ponents.) Lessons learned here are applied to the products we provide to auto-makers and the aftermarket worldwide.

Delivering Asset Efficiency Optimization Through SKF Reliability Systems, SKF provides a comprehensive range of asset efficiency products and services, from condition monitoring hardware and soft-ware to maintenance strategies, engineering assistance and machine reliability programs. To optimize efficiency and boost productivity, some industrial facilities opt for an Integrated Maintenance Solution, in which SKF delivers all services under one fixed-fee, performance-based contract.

Planning for sustainable growth By their very nature, bearings make a positive contribution to the natural en- vironment, enabling machinery to operate more efficiently, consume less power, and require less lubrication. By raising the performance bar for our own prod-ucts, SKF is enabling a new generation of high-efficiency products and equip-ment. With an eye to the future and the world we will leave to our children, the SKF Group policy on environment, health and safety, as well as the manufactur-ing techniques, are planned and implemented to help protect and preserve the earth’s limited natural resources. We remain committed to sustainable, environ-mentally responsible growth.

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SKF Transmission ABP.O Box 3157SE-550 03 Jönköping, SwedenTel. +46 36 10 08 30Fax +46 36 10 08 31E-mail: sales.skftransmission@skf.comwww.skftransmission.com

SKF is a registered trademark of the SKF Group.

© SKF 2005The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless permission is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein.

Publication 6007 EN · October 2005

This publication supersedes publication 3042 E.

Printed in Sweden on environmentally friendly paper. skf.com