FLENDER Standard Couplings Technical Information © Siemens AG 2015 4 6 8 10 3 Shaft-hub connections The bore and the shaft-hub connection of the coupling are de- termined by the design of the machine shaft. In the case of IEC standard motors, the shaft diameters and parallel key connec- tions are specified in accordance with DIN EN 50347. For diesel motors, the flywheel connections are frequently specified in ac- cordance with SAE J620d or DIN 6288. Besides the very widely used connection of shaft and hub with parallel keys to DIN 6885 and cylindrically bored hubs, couplings with Taper clamping bushes, clamping sets, shrink-fit connections and splines to DIN 5480 are common.
G_MD10_EN_00007a 2 Eccentricity of center of gravity e perm. in µm 10 2 2 4 6 8 2 10 4 6 8 The form stability of the shaft/hub connection can only be dem- onstrated when shaft dimensions and details of the connection are available. The coupling torques specified in the tables of power ratings of the coupling series do not apply to the shaft- hub connection unrestrictedly. 2 1 10 2 4 2 6 8 2 4 6 8 10 3 10 4 Coupling speed in rpm In the case of the shaft-hub connection with parallel key, the cou- pling hub must be axially secured, e.g. with a set screw or end washer. The parallel key must be secured against axial displace- ment in the machine shaft.
Standard balancing Micro-balancing Fine balancing All Siemens couplings with a finished bore and parallel keyway are designed with a set screw. Exceptions are some couplings of the FLUDEX series, in which end washers are used. During assembly, Taper clamping bushes are frictionally connected to the machine shaft. On request Example: Coupling speed = 1450 rpm required balancing quality level G 6.3 Assembly Assembly, start-up, maintenance and servicing of the coupling are described in the operating instructions. e perm. = 9600 ⋅ = 9600 ⋅ μ m G n ---- 6.3 1450 Contact protection Thus, the required eccentricity of center of gravity is 41.7 μ m.
The fine balancing with a maximum eccentricity of center of gravity of 40 μ m fulfills this requirement; therefore, the order code W02 has to be specified when ordering. Couplings are rotating components which can pose a risk to the environment. Siemens prescribes fitting couplings with a suit- able contact guard, also called a coupling guard in the operat- ing instructions. The contact guard, must provide a firm cover to protect against contact with the rotating coupling. The coupling must also be protected against blows from objects striking it. The coupling guard must enable the coupling to be adequately ventilated.
The following guidelines give information on design- ing the contact guard: 2006/42/EC EC Machinery Directive; EN 13463-1 Section 13.3.2.1; EN 13463-1 Section 7.4; EN 13463-1 Section 8.1. For many applications the following balancing quality recom- mendation applies: Maintenance Peripheral speed v in m/s Coupling outer diameter DA in mm Coupling speed n in rpm Coupling length LG in mm All-steel membrane couplings of the ARPEX series require no maintenance. If the operating and mounting conditions have been adhered to, only regular visual inspection is required. Elastomer elements, elastomer seals and lubricants are subject to wear through ageing and loads.
To avoid damage to the cou- pling or failure of the drive, the ZAPEX, N-EUPEX, N-EUPEX DS, RUPEX, N-BIPEX, ELPEX, ELPEX-S, ELPEX-B and FLUDEX se- ries must be maintained in accordance with the operating in- structions. On gear couplings, the lubricant must be changed at regular intervals. The following standards on balancing must be observed: • couplings are balanced in subassemblies. • hub parts without finished bore are unbalanced. • the number of balancing levels (one- or two-level balancing) is specified by Siemens. • without special specification balancing is done in accordance with the half-parallel-key standard.
Balancing in accordance with the full-parallel-key standard must be specified in the order number. • for FLUDEX couplings special balancing standards specified in Section 13 apply. • ARPEX couplings in standard balancing quality are unbal- anced. Thanks to steel components machined all over and precisely guided adapters the balancing quality of standard balancing is nearly always adhered to. On flexible or highly flexible couplings, the torsional backlash or the torsion angle must be checked at regular intervals under load. If a limit value is exceeded, the elastomer element must be replaced.
It is very important to maintain couplings which are operated in a potentially explosive environment, as couplings which are not maintained can become ignition sources. 2/4 Siemens MD 10.1 · 2015 G 40 G 25 G 16 G 10 G 6.3 G 4 G 2.5 G 1.6 G 1 Standard balancing Fine balancing Coupling v = DA ⋅n/19100 Short version with LG ≤3 x DA v ≤30 m/s v > 30 m/s Long version with LG > 3 x DA v ≤15 m/s v > 15 m/s