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RUPEX couplings are available as a catalog standard in 26 sizes with a rated torque of between 200 Nm and 1300000 Nm.

The coupling is suitable for ambient temperatures of between –30 °C and +80 °C. By using alternative elastomer buffers the ambient temperature range can be extended to between –50 °C and +100 °C.

Frequently, the coupling is used to connect the gear shaft to the driven machine. In the case of drives without gear units, the coupling is particularly suitable for operation in rough conditions or heavy-duty drives with electric motor drive. Ventilator drives with high ventilator mass and drives in the cement industry are typical applications.

Examples of particularly safety-relevant areas of application are cable railway drives, lifting gear for crane drives or escalator drives.

Обзор

Coupling suitable for potentially explosive environments. Complies with Directive 94/9/EC for:

II 2 G T4 / T5 / T6 D120 °C

–30 °C ≤ Ta ≤ +80 °C / +50 °C / +40 °C

I M2

RUPEX pin and bush couplings link machine shafts and compensate for shaft misalignment with weak restorative forces.
The torque is conducted through elastomer buffers, so the coupling has typically flexible rubber properties.
Thanks to their robust design, RUPEX couplings are also suitable for rough operating conditions.

Дизайн

A RUPEX coupling comprises two hub sections which are mounted on the machine shafts. The hub parts are connected positively by steel pins and elastomer buffers. The coupling can be fitted with add-on parts such as brake disks or brake drums. Up to size 360, the pins and buffers are fitted on one side. From size 400 up, the pins and buffers are fitted in the hubs on alternate sides.

Materials

Hubs

  • Type RWN and RWB made of grey cast iron EN-GJL-250
  • Types RWS and RBS made of steel

Flange

Types RFN, RFS made of steel

Pin

Material steel 42CrMo4, surface fine-machined

Buffer material

Material/description

Hardness

Identification

Ambient temperature

NBR standard type

80 ShoreA

Buffer black

–30 °C ... +80 °C

NBR electrically insulating

80 ShoreA

Buffer green

–30 °C ... +80 °C

NBR soft

60 ShoreA

Buffer black with green dot

–30 °C ... +80 °C

NBR hard

90 ShoreA

Buffer black with magenta dot

–30 °C ... +80 °C

NR for low temperature

80 ShoreA

Buffer black with white dot

–50 °C ... +50 °C

HNBR high temperature

80 ShoreA

Buffer black with red dot

–10 °C ... +100 °C



Brake disks

  • Type RWB made of EN-GJS-400 spheroidal graphite cast iron
  • Type RBS made of steel

Brake drums

  • Type RWB made of EN-GJL-250 grey cast iron
  • Type RBS made of steel

RUPEX pin and bush coupling types

Type

Description

RWN

Coupling made of grey cast iron

RWS

Coupling made of steel

RWB

Coupling made of grey cast iron with brake drum or brake disk

RBS

Coupling made of steel with brake drum or brake disk

RFN

Coupling made of grey cast iron in flange-shaft variant

RFS

Coupling made of steel in flange-shaft variant



Further application-related coupling types are available. Dimension sheets for and information on these are available on request.

RUPEX pin and bush coupling types on request

Type

Description

All

Coupling with axial backlash limitation

All

Coupling with pretensioned buffers

All

Coupling with lengthened pins and spacer sleeves

RKS

Coupling for engaging/disengaging during standstill

RWNH, RWSH

Coupling with extension piece

RBM

Coupling with lengthened pins for sliding rotor motors

RAK

Coupling combination RUPEX with ARPEX all-steel membrane coupling



Types RWN/RWS – One-sided arrangement of pins and buffers

Types RWN/RWS – Alternate-sided arrangement of pins and buffers

Types RWB/RBS with brake drum

Types RWB/RBS with brake disk

Types RFN, RFS

Функции

The motor torque is transmitted to the hub on the drive side via the shaft-hub connection, which is mostly designed as a keyway connection. With the aid of elastomer buffers mounted on steel pins, the torque is conducted to the hub on the output side.

The hub on the output side further transmits the torque to the driven machine or a gear unit located in between. Because of the primarily compression-loaded buffers, the coupling has a progressive torsional stiffness.

Особенности

RUPEX couplings can also hold loads when overloaded and are therefore especially suitable for drives for special safety and reliability requirements.

Torque shock loads and changing loads are no problem for robust, compact flexible RUPEX couplings.

The steel variant is also especially suitable for high-speed drives.

RUPEX couplings are fitted by putting together the coupling halves. Fitting with low torsional backlash is simplified by the barrel-shaped geometry of the buffers.

RUPEX couplings require little maintenance. Only the elastomer buffers, as wear parts, need be replaced and the coupled machines need not be moved to do so.

RUPEX couplings are suitable for reversing operation and horizontal and vertical fitting or fitting at any required angle.

Технические данные

Power ratings

Size

Rated torque for buffer type

Torsional stiffness at 50 %
capacity utilization for buffer type

Assembly

Permitted shaft misalignment at speed n = 1500 rpm1)

 

65 ShoreA

80 ShoreA

90 ShoreA

65 ShoreA

80 ShoreA

90 ShoreA

Gap dimension

Axial

Radial

Angle

 

TKN

TKN

TKN

CTDyn 50 %

CTDyn 50 %

CTDyn 50 %

ΔS

ΔKa

ΔKr

ΔKw

 

Nm

Nm

Nm

kNm/rad

kNm/rad

kNm/rad

mm

mm

mm

Degree

105

120

200

200

5

13

21

1.0

0.2

0.2

0.11

125

210

350

350

9

25

37

1.0

0.2

0.2

0.10

144

300

500

500

15

43

64

1.0

0.23

0.23

0.09

162

450

750

750

20

55

83

1.5

0.25

0.25

0.09

178

570

950

950

31

85

130

1.5

0.27

0.27

0.09

198

780

1300

1300

43

123

187

1.5

0.29

0.29

0.08

228

1300

2200

2200

65

184

270

1.5

0.3

0.3

0.08

252

1650

2750

2750

92

256

380

1.5

0.34

0.34

0.08

285

2600

4300

4300

141

390

560

1.5

0.36

0.36

0.07

320

3300

5500

5500

195

540

790

1.5

0.4

0.4

0.07

360

4700

7800

7800

276

610

940

1.5

0.43

0.43

0.07

400

7500

12500

12500

410

1130

1710

1.5

0.48

0.48

0.07

450

11000

18500

18500

570

1600

2380

1.5

0.52

0.52

0.07

500

15000

25000

25000

860

2350

3600

1.5

0.57

0.57

0.07

560

23500

39000

39000

1130

3070

4700

2.0

0.62

0.62

0.06

630

31000

52000

52000

1640

4600

7400

2.0

0.68

0.68

0.06

710

50000

84000

84000

2560

7200

10900

2.0

0.75

0.75

0.06

800

66000

110000

110000

3900

10700

16700

2.0

0.84

0.84

0.06

900

90000

150000

150000

5200

14300

22500

2.5

0.93

0.93

0.06

1000

115000

195000

195000

7700

21300

33000

2.5

1.03

1.03

0.06

1120

160000

270000

270000

9800

27300

44000

2.5

1.14

1.14

0.06

1250

205000

345000

345000

14000

39000

62000

2.5

1.26

1.26

0.06

1400

320000

530000

530000

22800

62000

97000

3.0

1.39

1.39

0.06

1600

450000

750000

750000

37000

103000

160000

3.0

1.55

1.55

0.06

1800

585000

975000

975000

48000

133000

208000

4.0

1.76

1.76

0.06

2000

780000

1300000

1300000

73000

201000

314000

4.0

2.17

2.17

0.06



1) The maximum speed of the respective type must be noted. For further information on permissible shaft misalignment, please see the operating instructions

All product codes listed below apply to standard buffers of NBR material in the 80 ShoreA variant.

For maximum coupling torque:
TKmax = 3.0 · TKN

For overload torque:
TKOL = 4 · TKN

For coupling fatigue torque:
TKW = 0.20 · TKN

The axial misalignment may occur dynamically at frequencies up to 10Hz.

For fitting, a maximum gap dimension of Smax = S + ΔS and a minimum gap dimension of Smin = S – ΔS are permitted.

Torsional stiffness and damping

The values stated in the above table apply to a capacity utilization of 50 %, an excitation amplitude of 10 % TKN with the frequency 10 Hz and an ambient temperature of 20 °C. Dynamic torsional stiffness is dependent on load and increases in proportion to capacity utilization. The following table shows the correction factors for different nominal loads.

CTdyn = CTdyn 50 % · FKC

 

Capacity utilization TNTKN

 

20 %

40 %

50 %

60 %

70 %

80 %

90 %

100 %

Correction factor FKC
65/80/90 Shore A

0.51

0.83

1.00

1.18

1.38

1.58

1.80

2.03



The damping coefficient is Ψ = 1.4

Furthermore, torsional stiffness and damping depend on the ambient temperature and the frequency and amplitude of the torsional vibration excitation. More precise torsional stiffness and damping parameters on request.

Permitted shaft misalignment

The permitted shaft misalignment depends on the operating speed. As the speed increases, lower shaft misalignment values are permitted. The following table shows the correction factors for different speeds.
The maximum speed for the respective coupling size and type must be observed!

ΔKperm = ΔK1500  · FKV

 

Speed in rpm

 

500

1000

1500

3000

Correction factor FKV

1.60

1.20

1.0

0.70



The axial misalignment may occur dynamically at frequencies up to 10 Hz. For fitting, a maximum gap dimension of Smax = S + ΔS and a minimum gap dimension of Smin = S – ΔS are permitted.

Shaft misalignments ΔKa, ΔKr and ΔKw may occur simultaneously.

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