Flexible couplings RUPEX series

Информационные материалы

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

II 2 G T4 / T5 / T6 D120 °C

–30 °C ≤ T_a ≤ +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.

Область применения

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.

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

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
	T_KN	T_KN	T_KN	C_{TDyn 50 %}	C_{TDyn 50 %}	C_{TDyn 50 %}	ΔS	ΔK_a	ΔK_r	ΔK_w
	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:
T_Kmax = 3.0 · T_KN

For overload torque:
T_KOL = 4 · T_KN

For coupling fatigue torque:
T_KW = 0.20 · T_KN

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

For fitting, a maximum gap dimension of S_max = S + ΔS and a minimum gap dimension of S_min = 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 % T_KN 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.

C_Tdyn = C_Tdyn 50 % · FKC

	Capacity utilization T_N / T_KN
	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!

ΔK_perm = 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 S_max = S + ΔS and a minimum gap dimension of S_min = S – ΔS are permitted.

Shaft misalignments ΔK_a, ΔK_r and ΔK_w may occur simultaneously.