TRASCO ES backlash-free couplings - Maryland Metricsmdmetric.com/prod/rfn/PDF_TRASCO ES USA.pdf ·...

TRASCO® ESbacklash-free couplings

®

Ringfeder Corporation

RINGFEDER Products are available from MARYLAND METRICSP.O. Box 261 Owings Mills, MD 21117 USA email: [email protected] web: http://mdmetric.com

phones: (410)358-3130 (800)638-1830 faxes: (410)358-3142 (800)872-9329

1

TRASCO® ES: backlash free couplings

Description

Operation

The TRASCO® ES consists of two hubs, made of high-strengthaluminum (up to the 38/45 size) or steel (from size 42) that areconnected with an elastic element.

The hubs are made by accurate machining, in order to achieveaccuracy, balance and optimal concentricity.

The spiders are made of a special polyurethane mixture that wasdeveloped after considerable research and laboratory testing.They are press-formed by a process which guarantees a highdegree of dimensional accuracy.

The spiders are available in different hardnesses: 92 Sh. A (yel-low), 98 Sh. A (red), 64 Sh. D (green), 80 Sh. A (blue).

Coupling performance depends on the type of spider selected(see “Technical data” ).

Other hardnesses are available on request to meet special ope-rating conditions, such as higher temperatures, higher torques,and higher degree of vibration-damping capability.

When the polyurethane element is installed in the precisionmachined hub it becomes precompressed, thereby providingthe zero backlash feature which characterizes the transmissionperformance of this coupling.

The coupling remains torsionally rigid (and backlash free) withinthe range of the pre-compression load, while permitting the

absorption of radial, angular and axial misalignments as well asundesired vibrations.

The significantly wide pre-compressed area of the flexible ele-ment keeps the contact pressure low against the elastic ele-ment. Therefore, the spider’s jaws, can be overloaded manytimes without losing original properties.

HUBS

ELASTIC ELEMENT

The main design function of the TRASCO® ES coupling is to transmit motion while absorbing misalignments and vibrations,with absolute precision and without any backlash whatsoever. The very compact design makes it a very rational and functional

device ideal in every positioning or feedback application.Ringfeder


2

• Backlash free torque transmission• Vibration dampening • Low inertia• Easy and time saving assembly• Maintenance free• High speed performance• Electrical isolation

In all positioning and feedback applications, smaller TRASCO®

ES couplings (up to size 19/24) replace successfully bellows,oldham, metallic beam and disc couplings. Larger TRASCO® ES

couplings (from size 24/28) replace successfully metal disc,rigid, steel gear and beam coupling in spindle drives, processline drives and other high torque drive applications.

Advantages

– Encoders– Steppers– Pulse generators– Tachometers– Medical equipment– Robotics– Servos– Ball screws– Machine tools spindles– Process lines

Main applications

The recommended operating temperature range for the TRA-SCO® ES is between –40 and +90°C. Peak temperatures as highas 120°C can be tolerated.Higher operating temperatures may cause the spider to lose aconsiderable amount of elasticity, thus substantially lowering thetorque capacity.Therefore, when selecting a coupling, the operating temperatu-re must be carefully considered. (see “Selection”)

Operating Temperature RangeT [°C]

Torsion angle [ rad]

Item code examples:

TRASCO® ES HubClamping hub Type (without keyway)Hub SizeBore ¬

ES SpiderSpider Size and Color (R = red, G = yellow, V = green, B = blue)

GES M 24/28 F20

AES 24/28 R

T [°C]

Torsion angle [rad]



phones: (410)358-3130 (800)638-1830 faxes: (410)358-3142 (800)872-9329

[kg m2] .087 x 10–6

[lbs in2] .296 x 10–3

[kg m2] .487 x 10–6

[lbs in2] 1.664 x 10–3

[kg m2] 2.660 x 10–6

[lbs in2] 9.089 x 10–3

[kg m2] 19.000 x 10–6

[lbs in2] .065 x 10–9

[kg m2] 74.170 x 10–6

[lbs in2] .253 x 10–9

[kg m2] 170 x 10–6

[lbs in2] .581 x 10–9

[kg m2] 494 x 10–6

[lbs in2] 1.690 x 10–9

[kg m2] 2162 x 10–6

[lbs in2] 7.390 x 10–9

[kg m2] 3671 x 10–6

[lbs in2] 12.540 x 10–9

3

Standard TypeThe hubs of the standard coupling type can be either solidor have a finished bore, the diameter of which correspondsto any one of the standard shaft diameters.

Both the solid hub and bored hub coupling are generallyavailable from stock for quick delivery.

from size 7 to 14 from size 19/24 to 38/45 from size 42

Mass moment*of inertia (J)

Size F min F max a A G L I M N s p c tWeight*

[kg] .003

[lbs] .007

[kg] .009

[lbs] .020

[kg] .020

[lbs] .044

[kg] .075

[lbs] .165

[kg] .154

[lbs] .339

[kg] .253

[lbs] .558

[kg] .455

[lbs] 1.003

[kg] 1.720

[lbs] 3.784

[kg] 2.390

[lbs] 5.258

[kg] 3.800

[lbs] 8.360

[kg] 4.500

[lbs] 9.900

7[mm]

[inch]

9[mm]

[inch]

14[mm]

[inch]

19/24[mm]

[inch]

24/28[mm]

[inch]

28/38[mm]

[inch]

38/45[mm]

[inch]

42[mm]

[inch]

48[mm]

[inch]

55[mm]

[inch]

65[mm]

[inch]

3

.12

4

.16

4

.16

6

.24

8

.31

10

.39

12

.47

14

.55

15

.59

25

.98

25

.98

7

.28

9

.35

14

.55

24

.94

28

1.10

38

1.50

45

1.77

42

1.65

48

1.89

70

2.76

75

2.95

–

–

–

–

–

–

–

–

–

–

–

–

–

–

75

2.95

85

3.35

110

4.33

115

4.53

14

.55

20

.79

30

1.18

40

1.57

55

2.17

65

2.56

80

3.15

95

3.74

105

4.13

120

4.72

135

5.31

–

–

7.2

.28

10,5

.41

18

.71

27

1.06

30

1.18

38

1.50

46

1.81

51

2.01

60

2.36

68

2.68

22

.87

30

1.18

35

1.38

66

2.60

78

3.07

90

3.54

114

4.49

126

4.96

140

5.51

160

6.30

185

7.28

7

.28

10

.39

11

.43

25

.98

30

1.18

35

1.38

45

1.77

50

1.97

56

2.20

65

2.56

75

2.95

8

.31

10

.39

13

.51

16

.63

18

.71

20

.79

24

.94

26

1.02

28

1.10

30

1.18

35

1.38

6

.24

8

.31

10

.39

12

.47

14

.55

15

.59

18

.71

20

.79

21

.83

22

.87

26

1.02

1.0

.04

1.0

.04

1.5

.06

2.0

.08

2.0

.08

2.5

.10

3.0

.12

3.0

.12

3.5

.14

4

.16

4.5

.18

6

0.24

1.5

.06

2

.08

3.5

.14

4

.16

5

.20

5

.20

5

.20

5

.20

5

.20

5

.20

M3

M3

M4

M5

M5

M6

M8

M8

M8

M10

M10

3,5

.14

5

.20

5

.20

10

.39

10

.39

15

.59

15

.59

20

.79

20

.79

22

.87

22

.87

ALUMINIUM HUBS

STEEL HUBS

* Value refers to single hubs with max bore. Bore tolerance: H7.

Hub


From size 7 to 19/24: single slot execution. From size 24/28 to 65: double slot execution.

4

M Type (with clamping hubs)This type of coupling provides a quick, backlash-free hub toshaft connection.To achieve the torque values shown, the socket head cap screw

tightening torque (Ms), must be respected.The M coupling type is available with or without keyway.

Mass moment*of inertia (J)

Size F min F max a A G L I M N s p f t Weight*

[kg] .003[lbs] .007[kg] .009[lbs] .020[kg] .020[lbs] .044[kg] .75[lbs] .165[kg] .154[lbs] .339[kg] .253[lbs] .558[kg] .455[lbs] 1.003

[kg] 1.720[lbs] 3.784[kg] 2.390[lbs] 5.258[kg] 3.800[lbs] 8.360[kg] 4.500[lbs] 9.900

7[mm][inch]

9[mm][inch]

14[mm][inch]

19/24[mm][inch]

24/28[mm][inch]

28/38[mm][inch]

38/45[mm][inch]

42[mm][inch]

48[mm][inch]

55[mm][inch]

65[mm][inch]

3.124

.164

.1610 .3915.5919.7520.79

281.1015.5925.9825.98

7.289

.3514.5520.7928

1.1035

1.3845

1.77

451.7750

1.9770

2.7675

2.95

––––––––––––––

752.9585

3.351104.331154.53

14.5520.7930

1.1840

1.5755

2.1765

2.5680

3.15

953.741054.131204.721355.31

––

7,2.2810,5.4118.7127

1.0630

1.1838

1.50

461.8151

2.0160

2.3668

2.68

22.8730

1.1835

1.3866

2.6078

3.0790

3.541144.49

1264.961405.511606.301857.28

7.2810.3911.4325.9830

1.1835

1.3845

1.77

501.9756

2.2065

2.5675

2.95

8.3110.3913.5116.6318.7120.7924.94

261.0228

1.1030

1.1835

1.38

6.248

.3110.3912.4714.5515.5918.71

20.7921.8322.8726

1.02

1.0.041.0.042.5.102.0.082.0.082.5.103,0,12

3.0.123.5.144

.164.5.18

6.241,5.062

.083,5.144

.165

.205

.20

5.205

.205

.205

.20

M2

M2,5

M3

M6

M6

M8

M8

M8

M10

M10

M10

3.5.145

.205

.2012.4714.5515.5920.79

20.7922.8722.8722.87

15.5923.4.9232.21.2745.71.8056.42.2272.62.8683.33.28

78.83.1090.63.571204.721244.88

[N m] .35[in. lbs] 3.1[N m] .75[in. lbs] 6.64[N m] 1.4[in. lbs] 12.4[N m] 11[in. lbs] 97.4[N m] 11[in. lbs] 97.4[N m] 25[in. lbs] 221[N m] 25[in. lbs] 221

[N m] 25[in. lbs] 221[N m] 49[in. lbs] 257[N m] 49[in. lbs] 434[N m] 49[in. lbs] 434

E Msscrews

ALUMINIUM HUBS

STEEL HUBS

Hub

[kg m2] .087 x 10–6

[lbs in2] .0296 x 10–3

[kg m2] .487 x 10–6

[lbs in2] 1.664 x 10–3

[kg m2] 2.660 x 10–6

[lbs in2] 9.089 x 10–3

[kg m2] 19.000 x 10–6

[lbs in2] 0.065 x 10–9

[kg m2] 74.170 x 10–6

[lbs in2] 0.253 x 10–9

[kg m2] 170 x 10–6

[lbs in2] 0.581 x 10–9

[kg m2] 494 x 10–6

[lbs in2] 1.690 x 10–9

[kg m2] 2162 x 10–6

[lbs in2] 7.390 x 10–9

[kg m2] 3671 x 10–6

[lbs in2] 12.540 x 10–9

4 5 6 7 8 9 10 11 12 14 15 16 19 20 22 24 25 28 30 32

.16 .20 .24 .28 .31 .35 .39 .43 .47 .55 .59 .63 .75 .79 .87 .94 .98 1.10 1.18 1.26

Recommended M execution hub bore diameter and transmissible torque

Type 35 38 40 42 45 48 50 55 60 65 701.38 1.50 1.57 1.65 1.77 1.89 1.97 2.17 2.36 2.56 2.76

.65 .70 .74 .79 – – – – – – – – – – – – – – – –

5.75 6.20 6.55 6.99 – – – – – – – – – – – – – – – –

1.48 1.55 1.63 1.71 1.79 1.86 1.94 2.02 – – – – – – – – – – – –

13.10 13.72 14.43 15.13 15.84 16.46 17.17 17.88 – – – – – – – – – – – –

3.20 3.32 3.43 3.55 3.67 3.79 3.91 4.03 4.14 4.38 4.50 4.62 – – – – – – – –

28.32 29.38 30.36 31.42 32.48 33.54 34.60 35.67 36.64 38.76 39.83 40.89 – – – – – – – –

– – – – – – 23 25 27 32 34 36 43 45 – – – – – –

– – – – – – 204 221 239 283 301 319 381 398 – – – – – –

– – – – – – 30 31 32 33 34 36 43 45 50 54 57 63 – –

– – – – – – 266 274 283 292 301 319 381 398 443 478 504 558 – –

– – – – – – – – – 75 76 78 79 83 91 100 104 116 124 133

– – – – – – – – – – 673 690 699 735 805 885 920 1027 1097 1177

– – – – – – – – – – 76 78 80 83 91 100 104 116 124 133

– – – – – – – – – – 673 690 708 735 805 885 920 1027 1097 1177

– – – – – – – – – – – – – 105 108 110 112 116 124 133

– – – – – – – – – – – – – 929 956 974 991 1027 1097 1177

– – – – – – – – – – – – – – – – 200 204 208 210

– – – – – – – – – – – – – – – – 1770 1805 1841 1859

– – – – – – – – – – – – – – – – – – – –

– – – – – – – – – – – – – – – – – – – –

– – – – – – – – – – – – – – – – – – – –

– – – – – – – – – – – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

– – – – – – – – – – –

145 – – – – – – – – – –

1283 – – – – – – – – – –

145 158 166 174 187 – – – – – –

1283 1398 1469 1540 1655 – – – – – –

145 158 166 174 187 – – – – – –

1283 1398 1469 1540 1655 – – – – – –

230 250 263 276 296 316 329 – – – –

2036 2213 2328 2443 2620 2797 2912 – – – –

462 480 496 502 510 527 531 542 570 591 –

4089 4248 4390 4443 4514 4664 4699 4797 5045 5230 –

– 504 520 532 545 562 570 592 610 632 352

– 4460 4602 4708 4823 4974 5045 5239 5399 5593 5770

7[N m]

[in. lbs]

9[N m]

[in. lbs]

14[N m]

[in. lbs]

19/24[N m]

[in. lbs]

24/28[N m]

[in. lbs]

28/38[N m]

[in. lbs]

38/45[N m]

[in. lbs]

42[N m]

[in. lbs]

48[N m]

[in. lbs]

55[N m]

[in. lbs]

65[N m]

[in. lbs]

∅ [mm]

[inches]


7

9

14

19/24

24/28

28/38

38/45

42

48

55

65


[kgm2] 6.50 x 10–6

[lbs in2].0022 x 10–9

[kgm2] 30.73 x 10–6

[lbs in2] .105 x 10–9

[kgm2] 132 x 10–6

[lbs in2] .449 x 10–9

[kgm2] 301 x 10–6

[lbs in2] 1.03 x 10–9

[kgm2] 933 x 10–6

[lbs in2] 3.19 x 10–9

[kgm2] 2946 x 10–6

[lbs in2] 10.0 x 10–9

[kgm2] 4809 x 10–6

[lbs in2] 16.4 x 10–9

[kg] .049[lbs] .108[kg] .120[lbs] .265[kg] .280[lbs] .617[kg] .407[lbs] .896[kg] .854[lbs] 1.879

[kg] 2.026[lbs] 4.458[kg] 2.619[lbs] 5.762[kg] 4.67[lbs] 10.27[kg] 6.7[lbs] 14.74

[N m] 1.3[in.lbs] 11.5[N m] 2.9[in.lbs] 25.7[N m] 6.0[in.lbs] 53.1[N m] 6.0[in.lbs] 53.1[N m] 10.0[in.lbs] 88.5

[N m] 35.0[in.lbs] 310[N m] 35.0[in.lbs] 310[N m] 69[in.lbs] 611[N m] 120[in.lbs] 1062

501.9766

2.6078

3.0790

3.541144,49

1264.961405.511606.301857.28

18.5.7325.9830

1.1835

1.3845

1.77

501.9756

2.2065

2.5675

2.95

13.5116.6318.7120.7924.94

261.0228

1.1030

1.1830

1.18

10.3912.4714.5515.5918.71

20.7921.8322.8726

1.02

1.5.062.0.082.0.082.5.103.0.12

3.0.123.5.144

.164.5.18

4.164

.164

.165

.205

.20

5.205

.205

.205

.20

M3

M4

M5

M5

M6

M8

M8

M10

M10

4

6

4

8

8

4

4

4

4

10.5.4118.7127

1.0630

1.1838

1.50

461.8151

2.0160

2.3668

2.68

301.1840

1.5755

2.1765

2.5655

2.17

953.741054.131204.721355.31

14.5519.7525.9835

1.3842

1.65

421.6548

1,8965

2.5670

2.76

14[mm][inch]

19/24[mm][inch]

24/28[mm][inch]

28/38[mm][inch]

38/45[mm][inch]

42[mm][inch]

48[mm][inch]

55[mm][inch]

65[mm][inch]

5

Size

A Type (shrink disc execution)It has been designed for high torque applications such asmilling and grinding spindles, ball screws and it is ideal forhigh speed machining applications.The special shrink disc design, allows blind mounting and

an extremely easy and time saving assembly.To achieve the torque value shown, the screws tighteningtorque (Ms) must be respected.

Mass moment of inertia (J)*F min F max A

Screws perlockingelement

Msscrews Weight*

Hub

6.2410.3915.5919.7520.79

281.1035

1.3840

1.5745

1.77

G L I M N s p h

ALUMINIUM HUBS AND STEEL SHRINK DISCS

STEEL HUBS AND SHRINK DISCS

10 11 14 15 16 17 18 19 20 22 24 25 28 30 32 35 38 40 42 45 ..39 .43 .55 .59 .63 .67 .71 .75 .79 .87 .94 .98 1.10 1.18 1.26 1.38 1.50 1.57 1.65 1.77

Recommended M execution hub bore diameter and transmissible torque

Type 48 50 55 60 65 701.89 1.97 2.17 2.36 2.56 2.76

10 12 22 – – – – – – – – – – – – – – – – –

89 106 195 – – – – – – – – – – – – – – – – –

42 46 60 65 69 74 79 84 88 – – – – – – – – – – –

372 407 531 575 611 655 699 743 779 – – – – – – – – – – –

– – – 66 72 77 82 87 92 102 113 118 135 – – – – – – –

– – – 584 637 681 726 770 814 903 1000 1044 1195 – – – – – – –

– – – – – – – 175 185 205 225 235 266 287 308 339 373 – – –

– – – – – – – 1549 1637 1814 1991 2080 2354 2540 2726 3000 3301 – – –

– – – – – – – – 255 283 312 326 367 398 427 471 515 545 577 620

– – – – – – – – 2257 2505 2761 2885 3248 3522 3779 4168 4558 4823 5106 5487

– – – – – – – – – – – – 420 460 500 563 627 670 714 790

– – – – – – – – – – – – 3717 4071 4425 4983 5549 5930 6319 6992

– – – – – – – – – – – – – – – 450 500 600 750 850

– – – – – – – – – – – – – – – 3983 4425 5310 6638 7523

– – – – – – – – – – – – – – – – – 1040 1062 1160

– – – – – – – – – – – – – – – – – 9204 9399 10266

– – – – – – – – – – – – – – – – – – 1580 1772

– – – – – – – – – – – – – – – – – – 1398315682

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

– – – – – –

850 880 – – – –

7523 7788 – – – –

1100 1200 1350 1480 – –

9735 106201194813098 – –

1210 1320 1370 1652 1680 1691

107091168212125146201486814965

1840 1960 2031 2440 2496 2890

162841734617974215942209025577

14[N m]

[in. lbs]

19/24[N m]

[in. lbs]

24/28[N m]

[in. lbs]

28/38[N m]

[in. lbs]

38/45[N m]

[in. lbs]

42[N m]

[in. lbs]

48[N m]

[in. lbs]

55[N m]

[in. lbs]

65[N m]

[in. lbs]

∅ [mm]

[inches]



14

19/24

24/28

28/38

38/45

42

48

55

65


501.9766

2.6066

2.6078

3.0778

3.0790

3.541144.491264.961405.511606.30

18,5.7325.9825.9830

1.1830

1.1835

1.3845

1.7750

1.9756

2.2065

2.56

15,5.6121.8321.8325.9825.9830

1.1840

1.5745

1.7750

1.9758

2.28

13.5116.6316.6318.7118.7120.7924.9426

1.0228

1.1030

1.18

10.3912.4712.4714.5514.5515.5918.7120.7921.8322.87

1,5.062,0.082,0.082,0.082,0.082,5.103,0.123,0.123,5.144

.16

2.083

.123

.123

.123

.124

.164

.164

.164

.164.5.18

17.6720.7923.9128

1.1030

1.1840

1.5746

1.8152

2.0552

2.0555

2.17

17.6719.7522.8729

1.1430

1.1840

1.5746

1.8155

2.1760

2.3672

2.83

8.5.339.5.379.5.3712.5.4912.5.4914.5.5716.5.6518.5.7320.5.8122.5.89

6

AP Type (according to DIN 69002)

Made in steel, in 10 sizes, it is the ideal coupling for high speed applications (up to 60 m/s) such as milling spindle onmachining centers as well as for multi spindles applications.

* Standard spindle shaft diameters.

Tkn = Nominal Torque

Tkmax = Maximum Torque

[kgm2] 13.80 x 10–6

[lbs in2] 0.047 x 10–9

[kgm2] 46,37 x 10–6

[lbs in2] 0.158 x 10–9

[kgm2] 46,37 x 10–6

[lbs in2] 0.158 x 10–9

[kgm2] 200 x 10–6

[lbs in2] 0.682 x 10–9

[kgm2] 200 x 10–6

[lbs in2] 0.682 x 10–9

[kgm2] 431 x 10–6

[lbs in2] 1.47 x 10–9

[kgm2] 1373 x 10–6

[lbs in2] 4.69 x 10–9

[kgm2] 2946 x 10–6

[lbs in2] 10.1 x 10–9

[kgm2] 4809 x 10–6

[lbs in2] 16.4 x 10–9

32.5537.540505550

1.9755

2.1765

2.5680

3.1595

3.741054.131204.72

14[mm][inch]

19/24 - 37.5[mm][inch]

19/24[mm][inch]

24/28 - 50[mm][inch]

24/28[mm][inch]

28/38[mm][inch]

38/45[mm][inch]

42[mm][inch]

48[mm][inch]

55[mm][inch]

SizeMass moment of inertia (J)**

FH6 A L Msscrews Weight**

Hub

[kg] .080[lbs] .176[kg] .160[lbs] .353[kg] .190[lbs] .419[kg] .330[lbs] .728[kg] .440[lbs] .970[kg] .640[lbs] 1.411[kg] 1.320[lbs] 2.910[kg] 2.026[lbs] 4.459[kg] 2.619[lbs] 5.762[kg] 4.74[lbs] 10.43

14*.5516*.6319*.7524*.9425*.9835*1.3840

1.5742

1.6545

1.7750

1.97

[N m] 1.89[in.lbs]16.7[N m] 3.05[in.lbs] 27[N m] 3.05[in.lbs] 27[N m] 8.5[in.lbs]75.2[N m] 8.5[in.lbs]75.2[N m] 8.5[in.lbs]75.2[N m] 14[in.lbs] 124[N m] 35[in.lbs] 310[N m] 35[in.lbs] 310[N m] 69[in.lbs] 610

I I2 M N s p F1 F2 F3

STEEL HUBS AND LOCKING ELEMENTS

SpindleSize

25 x 2032 x 2532 x 3040 x 3550 x 4563 x 55

Tkn

[N m] [in. lbs]

12.5 11114 12417 15043 38160 531160 1416

TRASCO®

ES - AP

1419/24-37.5

19/2424/28-50

24/2828/38

Tkmax

[N m] [in. lbs]

25 22128 24834 30186 761120 1062320 2832

Tkn

[N m] [in. lbs]

16 14217 15021 18654 47875 664200 1770

Tkmax

[N m] [in. lbs]

32 28334 30142 372108 956150 1328400 3540

98 Sh. A 64 Sh. D

For spindles according to DIN 69002

** Value refers to single hubs with max bore.


Misalignment

AXIAL RADIAL ANGULAR

.10 .004

.06 .002– –

.13 .005

.08 .003– –

.15 .006

.09 .004

.06 .002

.10 .004

.06 .002

.04 .002

.14 .006

.10 .004

.07 .003

.15 .006

.11 .004

.08 .003

.17 .007

.12 .005

.09 .004

.19 .007

.14 .006

.10 .004

.23 .009

.16 .006

.11 .004

.24 .009

.17 .007

.12 .005

.25 .01

.18 .007

.6 .024

.6 .024– –.8 .031.8 .031– –

1.0 .0391.0 .0391.0 .0391.2 .0471.2 .0471.2 .0471.4 .0551.4 .0551.4 .0551.5 .0591.5 .0591.5 .0591.8 .0711.8 .0711.8 .0712.0 .0792.0 .0792.0 .0792.1 .0832.1 .0832.1 .0832.2 .872.2 .872.2 .872.6 .1022.6 .102

219 1251421 2404

– –262 1496518 2958

– –336 1919604 3449856 48881230 70242210 126203220 186871620 92512810 160464050 231271950 111353520 201014750 271242580 147334840 276387060 403152670 152476120 349487970 455122780 158756930 395739100 519653200 283207100 628359910 877046410 567296620 58587

43 38169 611– –

95 841155 1372

– –344 3045513 4541702 62131890 167292830 250494092 362194720 417776800 601889820 869187560 6691411400 10090314350 12701415120 13382923630 20915234780 30784215930 14099852800 46733975800 67091516650 14737153600 47442099550 88112923100 20443563400 561090111700 98854597200 86022099500 880575

14.3 126.622.9 202.7

– –31.5 278.851.6 456.7

– –114.6 1014.3171.9 1521.5234.2 2072.9650 5753980 86741420 125691640 145162370 209773212 284302630 232783950 3496249250 4359185270 466458230 7284511480 1016117240 6408222080 19543329580 2618167850 6948122370 19800036200 32041113000 11505024000 21240042160 37311638500 34072539800 352230

–––––––––

19000190001900014000140001400011800118001180095009500950080008000800071007100710063006300630056005600

2.4 214 35– –6 5310 89– –

15 13325 22132 28320 17734 30142 37270 620120 1062150 1328190 1682320 2832400 3540380 3363650 5753810 7169530 4691900 79661120 9913620 54881050 92941310 11595820 72571370 121251650 146031800 159302080 18408

1.2 112 18– –3 275 44– –

7.5 6612.5 11116 14210 8917 15021 18635 31060 53175 66495 841

160 1416200 1770190 1682325 2877405 3585265 2346450 3983560 4957310 2744525 4647655 5797410 3629685 6062825 7301900 79651040 9204

Technical data

With peripheral speeds exceeding 30 m/s, dynamic balancing is recommended. This can be done on request.

* at 0.5 of Tkn

Size Spider

7

9

14

19/24

24/28

28/38

38/45

42

48

55

65

92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)64 Sh. D (green)92 Sh. A (yellow)98 Sh. A (red)

40000400004000028000280002800019000190001900014000140001400010600106001060085008500850071007100710060006000600056005600560050005000500046004600

V=30m/s

[rpm]

V=40m/s

[rpm]

TRASCO® ES couplings compensate for axial, radial and angu-lar misalignments, caused by heat extension, tolerances.Even after operating for an extended time period with a misa-lignment, there is still zero backlash because the elastic ele-ment is only stressed by pressure loads.

When an application causes a high degree of misalignment, adouble cardan design can be supplied.

Please contact our Engineering Office.

7

Tkn

[N m] [in. lbs]

Tkmax

[N m] [in. lbs]

CT stat.

[N m/rad] [in. lbs/rad]

CT din.*

[N m/rad] [in. lbs/rad]

Cr

[N/mm] [lbs/in.]

∆Ka

[mm] [in.]

∆Kr

[mm] [in.]

α

[°]

1.00.9–

1.00.9–

1.00.90.81.00.90.81.00.90.81.00.90.81.00.90.81.00.90.81.00.90.81.00.90.81.00.9


Assembly

Due to its superior design, the TRASCO® ES coupling offer sim-ple and time saving assemblies. Blind and detachable mountingis also possible.

Shaft should be carefully cleaned.

While mounting the coupling it is important to respect the “s”dimension to guarantee optimal misalignment capability as wellas to assure electrical isolation.To reduce the assembling axial force it is possible to lubricatethe elastomer spider’s jaws.

Shrink disc hubs (execution “A”)

Once the hub is installed on the shaft, the screws must betightened uniformly and crosswise to the indicated tighteningtorque (Ms).

To dismantle unscrew all bolts, insert the screws in thedismounting threaded holes and tighten gradually until the hubis released.The cone surface of the shrink disc hubs are greased at thefactory to guarantee superior performances.

8

Tkn Nominal torque

Tkmax Maximum torque

CT stat. Static Torsional Rigidity

CT din. Dynamic Torsional Rigidity

Cr Radial Rigidity

α Angular Misalignment. Kr Radial Misalignment. Ka Axial Misalignment

Elastic element

80 Shore A92 Shore A98 Shore A64 Shore D

Color

Blue Yellow Red

Green

Te [°C]

-50 + 80-40 + 90-30 + 90-30 + 100

Tmax [°C]

-60 + 120-50 + 120-40 + 120-40 + 140

S

Note

Observe safety laws regarding protecting personnel from rotating equipement.



phones: (410)358-3130 (800)638-1830 faxes: (410)358-3142 (800)872-9329

Coupling selection

The coupling must be chosen so that the applied working loads do not exceed the allowable values whatever the workingconditions.

1. Nominal torqueThe nominal coupling torque must be greater than or equal to the nominal torque of the drive machine for all workingtemperatures.

TKN ≥ Tk • S� • SD

2. Torque peak valuesThe maximum coupling torque must be greater than or equal to the torque peaks that occur during operation for all workingtemperatures.

Tkmax ≥ Ts • S� • S� � Tk • S� • SDUrti lato motore:

TS = TAS • 1

• SA � TL(1)

m + 1

Urti lato condotto:

TS = TLS • m

• SL � TL(1)

m + 1

3. Periodic torque inversionsBy means of resonanceWhen the resonance frequency is passed rapidly below the operational interval, just a few torque peaks are seen. The generat-ed alternating loads must be compared with the maximum torque that the coupling can support.

Tkmax ≥ Ts • S� • S� � Tk • S� • SDUrti lato motore:

TS = TAi • 1

• VR � TL(1)

m + 1

Urti lato condotto:

TS = TLi • m

• VR � TL(1)

m + 1

4. Non periodic torque inversionsTo check the load with respect to nonperiodic torque inversions, the following equations must be satisfied:

0,25 Tkn = TKW ≥ Twi • S� • Sf • SDUrti lato motore:

Twi = TAi • 1

• Vfim + 1

Urti lato condotto:

Twi = TLi • m

• Vfim + 1

(1) TL to be added if a torque peak occurs during acceleration.

Type of Impact SL o Sa

f in Hz ≤10 >10

Sf 1 ��

S/h 0-100 101-200 201-400 401-800 801-1.600

S� 1 1,2 1,4 1,6 1,8

T [°C] –30/+30 +40 +60 +80

[°F] –21/+86 +104 +140 +175

S� 1 1,2 1,4 1,8

Positioning systems Tooling machines Speed and angular acceleration indicator

2-5 3-8 10->

S� = Temperature Factor

Calculation Coefficients

S� = Starting Frequency Factor

Sf = Frequency Factor

f /10

SD = Torsional Rigidity Factor

SL o Sa = Shock Factor

Light 1,5

Medium 1,8

Heavy 2,2

( )( )

Vfi = Torque-Amplification Factor = ��

2�

1 – +

1 + 2

n2

nR2

2

( )�

2�

2

nR = Resonance Frequency = � JA + JL

JA • JL

30�

CT din. [min–1] m = Mass Factor = JA

JL

Motor-side peaks: Driven-side peaks:



9Ringfeder Corporation

Example of Selection

Application

Servomotor driving a ball screw on a machine tool

Selection

TRASCO® ES coupling with Red Elastic element (98 Sh. A) execution “A” size 24/28

Standard coupling torque: Maximum torque:Hub Moment of Inertia:Couple Transmitted by shrink disc hub:

TKN = 60 NmTKmax = 120 NmJ2 = 0,000135 kg•m2

Tcal = 92 Nm for bore 20{113 Nm for bore 24

Nominal TorquePeak TorqueRpmMoment of InertiaTemperature

Shock TypeTable Moment of InertiaDriven ShaftMotor Shaft

lightJ3 = 0,0038 kg•m2

dc = 20 mm h6 (without slot)dm = 24 mm h6 (without slot)

TK = 10,0 NmTAS = 22,0 Nmn = 3.000 1/minJ1 = 0,0058 kg•m2

T = +40°C

Load CheckTKN = Tk • S� • SD = 10�1,2�4 = 48,0 Nm

TKmax = Ts • S� • S� + Tk • S� • SD = 13,2�1,6�1,2 + 12,5�1,2�4 = 85,34 Nm

TKmax = 85,34 Nm <Tcal

TKN = 48,0 Nm < Tcal

TS = 13,2 Nm

TS = TAS • • SA = 22,0 • • 1,5 = 13,2 Nm

JA = J1 + J2

JL = J3 + J2

m = m = 1,5JA

JL

1m + 1

11,5 + 1

TKN

TK

TKmax

TS

TAS/TAI

TL

TLS/TLI

VR

Vfi

m

JA

JL

[Nm]

[Nm]

[Nm]

[Nm]

[Nm]

[Nm]

[Nm]

[–]

[–]

[–]

[kgm2]

[kgm2]

Coupling nominal torque

Motor-side nominal torque

Coupling maximum torque

Peak drive motor torque

Motor-side peak torque

Acceleration delivered torque

Driven-side peak torque

Resonance factor

Torque-amplification factor

Mass factor

Motor-side inertia

Driven-side inertia

nR

CT

TR

SA

SL

S�

S�

SD

Sf

Twi

Tkw

[–]

[–]

[Nm/rad]

[Nm]

[–]

[–]

[–]

[–]

[–]

[–]

[Nm]

[Nm]

Damping factor

Resonance Rpm

Torsional rigidity

Transmissible torque moment

Motor-side shock or peak factor

Driven-side shock or peak factor

Event-frequency factor

Temperature factor

Torsional rigidity factor

Frequency factor

Torque with reversing peaks

Torque with coupling reversal

10 Ringfeder Corporation

linear micrometer µm micro inch1 µm 0.0254 1 25.4 mm = 1 inch(length) millimeter mm inch mm 25.4 305 mm = 1 foot

meter m foot m 0.3048 25 µm = 0.001 inch

area square millimeter mm2 inch2 mm2 645.16 645 mm2 = 1 in2

square meter m2 foot2 m2 0.0929 1 m2 = 11 ft2

volume cubic millimeter mm3 inch3 mm3 16 387 16 400 mm = 1 in3

cubic meter m3 foot3 m3 0.02832 1 m3 = 35 ft3

density kilogram per kg/m3 pound per kg/m3 16.018 16 kg/m3 = 1 lb/ft3

cubic meter cubic foot

mass gram g ounce g 28.35 28 g = 1 ozkilogram kg pound kg 0.4536 1 kg = 35 ozton t tons (US) t 0.90718 1 kg = 2.2 lbs

force Newton N ounce N 0.278 1 N = 3.6 ozpound N 4.448 4.4 N = 1 lb

1 kN = 225 lb

stress mega pascal MPa pound/sq in MPa 0.00689 1 MPa = 145 psior (Newton per (PSI) (N/mm2) 7 MPa = 1000 psi = 1 ksipressure square millimeter) N/mm2

torque Newton meter N-m inch ounce N-m 0.00706 1 N-m = 142 in ozinch pound 0.11298 1 N-m = 8.85 in-lbfoot pound 1.3558 1.356 N-m = 1 ft-lb

1 N-m = 0.74 ft-lb

energy Joule J foot pounds J 1.3558 1 J = 0.75 ft-lbor work calories 4.187 1 J = 4 calories

temperature degree celsius °C Fahrenheit °C 0.556 (°F-32) 0 °C = 32 °F (accurate)20 °C = 68 °F (accurate)

100 °C = 212 °F (accurate)

Conversion from US-customary units

Kind ofDimension

MetricUnit

Symbol ConvertedFrom: To: Factor

For Quick ReferenceApproximate Factor

1 Factor 0.0254 applies when 1 micro inch (µin) is listed like this: 1 µinExample: 120 µin = 120�0.0254 = 3.048 micrometers (µm)

Factor 25400 applies when 1 micro inch (µin) is listed like this: .000001 inExample: .00012 in = .00012�25400 = 3.048 micrometers (µm)

Equations

Torque (in.-lbs) = 63025 � HorsepowerRPM

Horsepower = T (in.-lbs.) � RPM63025

Torque (ft.-lbs) = (5252) (H.P.)RPM

Horsepower = (T) (ft.-lbs.) � RPM5252

11Ringfeder Corporation

RFC SPECIALTY PRODUCTS

In accordance with our established policy to constantly improve our products, the specifications contained herein are subject to change without notice.

Since our Engineers cannot be aware of all applications and cannot control all the factors that may affect the function of our products, our warranty applies toour products only.

TECHNICAL ASSISTANCECall us Toll Free at 1–800–638-1830

Please let us know what your specific requirements are andwe shall be very happy to work out detailed recommenda-tions without any obligation. Just send a sketch with yourrequirements and specifications.

Call or write for more information.Visit our website: www.mdmetric.com

Our Representative:

Trasco® ES

RING-flex® Single Flexing andDouble Flexing Couplings withRingfeder® Shrink Discs®

Assure a totally backlash-free connec-tion with precise synchronization capa-bility. Additional features: Clearance fitsfor hub/shaft connection allow easyassembly and free axial movementcompensation during installation whicheliminates unwanted pre-loading or pre-stressing of the flexible elements.

ARCUSAFLEX® FlywheelCouplingsHighly flexible, backlash-free, vulcanizedrubber disc couplings designed to cou-ple the flywheel of an internal combus-tion engine to the shaft of the drivenmachine. Rubber disc element acceptsrelatively high angular, axial and parallelmisalignments. Flange dimensionsaccording to SAE J620 standards.

Multi Mont OCTA FlywheelCouplingsTorsionally flexible, economical flangecouplings for connecting the flywheel ofa combustion engine to the input shaftof a driven machine. Rubber elementsdampen vibrations and accommodatemisalignments.

RFC Specialty Locking DevicesRingfeder Corporation excels at special-ty keyless shaft/hub connection solu-tions. From 1/4” shafts to 30” shafts,our engineers have the solution.

BALL DETENT TORQUE LIMITERS Type BDThese accurate ball/roller and sockettorque limiters are easily adjustable fordifferent torque settings. In the event ofan overload, personnel and equipmentare protected as these devices discon-nect mechanically and make contactwith a limit switch that sounds andalarm or otherwise shuts the drivedown. Available in various configura-tions and combinations with couplings.

FRICTION TORQUE LIMITERType FCEasily adjustable, these torque limitersrely on friction to transmit the set torque.When an overload occurs, these devicesslip until the overload is removed or themachine is reset. Available in variousconfigurations and combinations withcouplings.


phones: (410)358-3130 (800)638-1830 faxes: (410)358-3142 (800)872-9329

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