Flexible Shaft Coupling Accessories - EK Series Elastomer Inserts (Part Numbers)

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The equalizing element of the EK coupling is the elastomer insert. It transmits torque without backlash or vibration. The elastomer insert defines the characteristics of the entire drive system.

Backlash is eliminated by the press fit of the elastomer into the hubs. Through variation of the Shore hardness of the elastomer insert, the coupling system can be optimized for the ideal torsional characteristics.

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Product specification
Part Numbers

R+W Elastomer Couplings

Information

Axes of Misalignment


Lateral	Angular	Axial

Function

The equalizing element of the EK coupling is the elastomer insert.
It transmits torque without backlash or vibration.The elastomer
insert defines the characteristics of the entire drive system.

Backlash is eliminated by the press fit of the elastomer into the hubs.
Through variation of the Shore hardness of the elastomer insert,
the coupling system can be optimized for the ideal torsional characteristics.

Sizes 2 - 800

Shore hardness 98 A Shore hardness 64 Sh D Shore hardness 80 Sh A Shore hardness 65 Sh D Shore hardness 64 Sh D

Sizes 2500 - 9500

The coupling includes 5x elastomer segments

Shore hardness 98 Sh A Shore hardness 64 Sh D Shore hardness 65 Sh D Shore hardness 64 Sh D

Specification

Description of the Elastomer Inserts

Type	Shore hardness	Color	Material	Relative damping (Ψ)		Temperature range		Features
A	98 Sh A	red	TPU		0.4 - 0.5		-30°C to +100°C	high damping
B	64 Sh D	green	TPU		0.3 - 0.45		-30°C to +120°C	high torsional stiffness
C	80 Sh A	yellow	TPU		0.3 - 0.4		-30°C to +100°C	very high damping
D*	65 Sh D	black	TPU		0.3 - 0.45		-10°C to +70°C	electrically conductive
E	64 Sh D	beige	Hytrel		0.3 - 0.45		-50°C to +150°C	temperature resistant

*The electrical conductivity of the elastomer material is to prevent the electrostatic charging of the elastomer coupling system, to reduce the risk of sparking in operation. ATEX technical data is available upon request.
The values of the relative damping were determined at 10 Hz and +20˚ C.

Sizes EK

SIZE			2			5			10			20			60			150
Type (Elastomer insert)			A	B	C	A	B	C	A	B	C	A	B	C	A	B	C	A	B	C
Static torsional stiffness	(Nm/rad)	C_T	50	115	17	150	350	53	260	600	90	1140	2500	520	3290	9750	1400	4970	10600	2000
Dynamic torsional stiffness	(Nm/rad)	C_Tdyn	100	230	35	300	700	106	541	1650	224	2540	4440	876	7940	11900	2072	13400	29300	3590
Lateral	(mm)	Max. values	0.08	0.06	0.2	0.08	0.06	0.2	0.1	0.08	0.22	0.1	0.08	0.25	0.12	0.1	0.25	0.15	0.12	0.3
Angular	(Degree)		1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1	0.8	1.2
Axial	(mm)		±1			±1			±1			±1.5			±1.5			±1.8

SIZE*			300			450			800			2500		4500		9500
Type (Elastomer insert)			A	B	C	A	B	C	A	B	C	A	B	A	B	A	B
Static torsional stiffness	(Nm/rad)	C_T	12400	18000	3000	15100	27000	4120	41300	66080	10320	87600	109000	167000	372000	590000	670000
Dynamic torsional stiffness	(Nm/rad)	C_Tdyn	23700	40400	6090	55400	81200	11600	82600	180150	28600	175000	216000	337000	743000	1180000	1340000
Lateral	(mm)	Max. values	0.18	0.14	0.35	0.2	0.18	0.35	0.25	0.2	0.4	0.5	0.3	0.5	0.3	0.6	0.4
Angular	(Degree)		1	0.8	1.2	1	0.8	1.2	1	0.8	1.2	1.5	1	1.5	1	1.5	1
Axial	(mm)		±2			±2			±2			±3		±3		±4

Static torsional stiffness at 50% T_KN Dynamic torsional stiffness at T_KN
* Note: The technical values for elastomer inserts D and E correspond to the values for B, due to the identical Shore hardness.

Data to be displayed: 30; 45; 60

Part Number
EK/4500/A
EK/4500/B
EK/4500/D
EK/4500/E

Standard Unit Price	Minimum order quantity	Standard Shipping Days ?	Allowable Torque Range (N•m)	Max. Rotational Speed Range (r/min)	Feature	Allowable Torque (Nm)	Max. Rotational Speed (r/min)	Allowable Lateral Misalignment Range (mm)	Allowable Lateral Misalignment (mm)	Allowable Angular Misalignment (deg)	Operating Temperature Range (°C)	Allowable Axial Clearance (±) (mm)	Torsional Stiffness (N-m/rad)	Size	Elastomer Insert
24.53 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	Vibration Insulation	5000	3000	0.41 to 1.0	0.5	1.5	-30～100	3	167000	4500	A - Shore 98A
24.53 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	High Torsional Rigidity	6200	3000	0.21 to 0.40	0.3	1	-30～120	3	372000	4500	B - Shore 64D
45.35 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	-	6200	3000	0.21 to 0.40	0.3	1	-10～70	3	372000	4500	D - Shore 65D
125.02 €	5	12 Days	5,000 to Less Than 10,000	2001 to 4,000	Heat Resistant	6200	3000	0.21 to 0.40	0.3	1	-50～150	3	372000	4500	E - Shore 64D

Basic information

Type	Jaw Type	Allowable Misalignment	Angular Misalignment / Eccentricity / Axial Misalignment	Body Material	Resin
Shaft D1 Keyway	Without Keyway	Shaft D2 Keyway	Without Keyway

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Basic Attributes

Max. Rotational Speed Range(r/min)
1,001 to 2,000

2001 to 4,000

10,001 to 78,000
Clear
Feature
High Torsional Rigidity

Vibration Insulation

Heat Resistant
Clear
Allowable Torque(Nm)
1

2.4

4

5

6

12

22

24

25

29

32

34

35

42

85

105

120

150

170

190

240

280

320

400

567

650

810

945

950

1060

1100

1350

1950

2450

5000

6200

10000

12500
Clear
Max. Rotational Speed(r/min)
2000

3000

3500

4000

11900

12000

15000

16000

17000

18000

18200

21700

22000

25000

26000

31000

40000

42000

43000

44100

45000

53000

57000

60000

63000

65000

67000
Clear
Allowable Lateral Misalignment Range(mm)
0.02 to 0.2

0.21 to 0.40

0.41 to 1.0
Clear
Allowable Lateral Misalignment(mm)
0.06

0.07

0.08

0.1

0.12

0.13

0.14

0.15

0.18

0.2

0.22

0.25

0.3

0.35

0.4

0.5

0.6
Clear
Allowable Angular Misalignment(deg)
0.056

0.08

0.56

0.8

1

1.2

1.5
Clear
Torsional Stiffness(N-m/rad)
17

50

53

90

115

150

260

350

520

600

1140

1400

2000

2500

3000

3290

4120

4970

9750

10320

10600

12400

15100

18000

27000

41300

66080

87600

109000

167000

372000

590000

670000
Clear
Size
2

5

10

20

60

150

300

450

800

2500

4500

9500
Clear
Elastomer Insert
- B - Shore 64D
- E - Shore 64D
- D - Shore 65D
- C - Shore 80A
- A - Shore 98A
Clear
Type
- A
- B
- C
- D
- E
Clear
Allowable Torque Range(N•m)
0.05 to 1.00

1.01 to 3.00

3.01 to 5.00

5.01 to 10.00

10.01 to 20.00

20.01 to 50.00

50.01 to 100.00

100 to Less Than 500

500 to Less Than 1,000

1000 to Less Than 5000

5,000 to Less Than 10,000

10,000 to Less than 20,000
Clear