www.jbj.co.uk/couplings.html#flender Standards Machines Couplings Balancing Shaft-hub connections Formula symbols Key to the formula symbols 2006/42/EC EC Machinery Directive 94/9/EC ATEX Directive – Manufacturer – and ATEX Guideline to Directive 94/9/EC 2014/34/EU ATEX Directive – Manufacturer 1999/92/EC ATEX Directive – Operator – and ATEX Guideline to Directive 1999/92/EC DIN EN 13463 Non-electrical equipment for use in potentially explosive atmospheres DIN EN 1127 Explosive atmospheres, explosion prevention and protection DIN EN 50347 General-purpose three-phase induction motors having standard dimensions and outputs DIN 740 Flexible shaft couplings Part 1 and Part 2 VDI Guideline 2240 Shaft couplings - Systematic subdivision according to their properties VDI Technical Group Engineering Design 1971 API 610 Centrifugal Pumps for Petroleum, Chemical and Gas Industry Services API 670 Machinery Protection System API 671 Special Purpose Couplings for Petroleum, Chemical and Gas Industry Services ISO 10441 Petroleum, petrochemical and natural gas industries – Flexible couplings for mechanical power transmissionspecial-purpose applications DIN ISO 1940 Requirements for the balancing quality of rigid rotors DIN ISO 21940-32 Mechanical vibrations; standard governing the type of parallel key during balancing of shafts and composite parts DIN 6885 Driver connections without taper action – parallel keys – keyways SAE J620d Flywheels for industrial engines ... DIN 6288 Internal-combustion piston engines Connection dimensions and requirements for flywheels and flexible coupling ASME B17.1 Keys and keyseats DIN EN 50347 General-purpose three-phase induction motors with standard dimensions and output data BS 46-1:1958 Keys and keyways and taper pins Specification Name Symbol Unit Explanation Torsional stiffness, dynamic CTdyn Nm/rad For calculating torsional vibration Excitation frequency ferr Hz Excitation frequency of motor or driven machine Moment of inertia J kgm2 Moment of inertia of coupling sides 1 and 2 Axial misalignment DKa mm Axial misalignment of the coupling halves Radial misalignment DKr mm Radial misalignment of the coupling halves Angular misalignment DKw ° Angular misalignment of the coupling halves Service factor FB Factor expressing the real coupling load as a ratio of the nominal coupling load Frequency factor FF Factor expressing the frequency dependence of the fatigue torque load Temperature factor FT Factor taking into account the reduction in strength of flexible rubber materials at a higher temperature Weight m kg Weight of the coupling Rated speed nN rpm Coupling speed Maximum coupling speed nKmax rpm Maximum permissible coupling speed Rated power PN kW Rated output on the coupling, usually the output of the driven machine Rated torque TN Nm Rated torque as nominal load on the coupling Fatigue torque TW Nm Amplitude of the dynamic coupling load Maximum torque Tmax Nm More frequently occurring maximum load, e.g. during starting Overload torque TOL Nm Very infrequently occurring maximum load, e.g. during short circuit or blocking conditions Rated coupling torque TKN Nm Torque which can be transmitted as static torque by the coupling over the period of use. Maximum coupling torque TKmax Nm Torque which can be frequently transmitted (up to 25 times an hour) as maximum torque by the coupling. Coupling overload torque TKOL Nm Torque which can very infrequently be transmitted as maximum torque by the coupling. Fatigue coupling torque TKW Nm Torque amplitude which can be transmitted by the coupling as dynamic torque at a frequency of 10 Hz over the period of use. Resonance factor VR Factor specifying the torque increase at resonance Temperature Ta °C Ambient temperature of the coupling in operation Damping coefficient Y Psi Damping parameter 15 #DriveLineHarmony Technical Information Mechanical Power Transmission Couplings
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