Torsionally Rigid Couplings - SIPEX Series

• Информационные материалы

  Информационные материалы

  

  SIPEX couplings are torsionally rigid and backlash-free. They are characterized by their compact design and high power density. SIPEX couplings connect machine shafts and compensate for shaft misalignment that can occur during assembly or operation.

  SIPEX couplings are suitable for all drive applications which require a coupling that offers positioning accuracy as well as a reliable, wear- and maintenance-free torque transmission.

  Область применения

  

  SIPEX couplings are available in 19 sizes within the standard catalog range, 7 of which are miniature versions and the other 12 standard designs. Rated torques range from 0.1 to 5000 Nm. The coupling is suitable for ambient temperatures of between -30 °C to +120 °C

  Couplings manufactured by alternative methods are available for higher ambient temperatures up to +250 °C.

  SIPEX couplings from the standard range are especially suitable for application in highly dynamic drives such as, for example, linear axes in machine tools, packaging machines or printing presses, or generally for automation technology.

  SIPEX couplings from the miniature range are designed for use in combination with rotary encoders, stepper motors or tachometers.

  Дизайн

  SIPEX couplings consist of two hub parts that are connected by means of bellows made of high-strength stainless steel.

  The hubs can be coupled to the shafts by many different methods including set screws, key joint, slotted clamping hubs, half-shell hubs, clamping hubs or expanding hubs.

  Thanks to their metal bellows, SIPEX couplings are torsionally rigid, but flexible. Misalignment between the connected shafts deforms the metal bellows.

  Coupling materials:

  Depending on the coupling version, hubs are made of aluminum (N, G, H) or steel (K, I), but stainless-steel variants are also optionally available.

  All the metal bellows are made of stainless steel and are available as single-wall or multiple-wall devices depending on size and application. Metal bellows come in various standard lengths.

  Metal bellows can be combined with different hub versions to create a complete unit. Once the hubs have been joined to metal bellows, they cannot be dismantled again.

  Hub versions:

  N: Hub with set screws
  G: Slotted clamping hub
  H: Half-shell clamping hub
  K: Clamping hub with external taper
  I: Clamping hub with internal taper
  S: Expanding hub

  Hubs are supplied as standard with bore tolerance H7 and without keyway.

  Versions N, G and H are optionally available with keyway in accordance with DIN 6885-1.

  The fitting tolerance of the coupled shaft ends should be g6 or h7.

  Versions of SIPEX couplings:

  Type	Description
  SNN	Hub with set screw on both sides
  SGG	Slotted clamping hub on both sides
  SGG-A	Slotted clamping hub - for axial plug-in
  SHH	Half-shell clamping hub on both sides
  SKK	Clamping hub with external taper on both sides
  SGS	Hub 1: Slotted/Hub 2: Expanding hub
  SHH-W	Drive shaft with half-shell clamping hubs
  SII	Clamping hubs with internal taper on both sides

  
  
  

  Hub variants

  

  Set screw

  

  Clamping hub

  

  Axial plug-in

  

  Half-shell clamping hub

  

  External taper

  

  Internal taper

  

  Expanding hub

  Особенности

  SIPEX couplings are suitable for mounting horizontally, vertically or in any desired position. The coupling parts can be arranged as required on the shaft ends to be connected.

  The metal bellows are very torsional-resistant and combined with different clamping connections they ensure an absolutely angle-preserving torque transmission between the connected shafts. The moment of inertia is low.

  SIPEX couplings compensate axial, radial and angular shaft misalignment with only low restoring forces. SIPEX couplings are wear-free within their technical limits and therefore offer an unlimited service life.

  Технические данные

  Coupling dimensioning

  Dimensioning according to torque

  It must be ensured that the coupling is capable of safely transferring peak torques that regularly occur at the drive or load end. The service factor is provided in order to describe the deviation between the real coupling load and ideal load conditions:

  T_KN ≥ T_AS × FB or T_LS × FB

  Torque characteristic of drive	Service factor FB
  uniform	1.5
  nonuniform	2
  rough	2.5 - 4
  Servomotors (machine tools)	1.5 - 2

  
  
  

  Dimensioning according to acceleration torques

  The correct coupling size can be calculated more accurately on the basis of acceleration or deceleration torques because the peak torque at the coupling is reduced by the ratio between the moments of inertia on the drive and load ends:

  T_KN ≥ T_S × FB

  T_S = T_AS × J_L : (J_A + J_L) or T_S = T_LS × J_L : (J_A + J_L)

  Checking the maximum torsion angle

  If the application requires a maximum torsion angle of the coupling, the selected coupling size must be checked to ensure that it is sufficiently torsionally rigid for the application in question:

  φ = (180 : π) × (T_S : C_Tdyn)

  Checking the maximum speed

  For all load situations n_Kmax > n_max

  Checking the permitted shaft misalignment

  The actual shaft misalignment must be less than the permitted shaft misalignment for all load situations.

  Checking the shaft-hub connection

  In the case of clamping connections without feather key, it must be ensured that the transmissible torque of the hub connection is greater than the peak torque at the coupling.

  Formula symbols

  Key to formula symbols

  Name	Formula symbol	Unit	Explanation
  Rated coupling torque	TKN	Nm	Torque which can be transmitted as static torque by the coupling over the period of use.
  Coupling overload torque	TKOL	Nm	Torque which can be transmitted very rarely as maximum torque by the coupling.
  Peak torque at drive end	TAS	Nm	Peak torque during non-periodic torque surges at drive end
  Peak torque at load end	TLS	Nm	Peak torque during non-periodic torque surges at load end
  Peak torque	TS	Nm	Peak torque at the coupling
  Service factor	FB		Factor that expresses the real coupling load as a ratio of the nominal coupling load
  Moment of inertia of drive end	JA	kgm2	Sum of the moments of inertia at the drive end referred to the coupling speed
  Moment of inertia of load end	JL	kgm2	Sum of the moments of inertia at the load end referred to the coupling speed
  Torsion angle	φ	°	Torsion angle of the coupling under torsional load
  Torsional stiffness, dynamic	CTdyn	Nm/rad	Dynamic torsional stiffness of the coupling
  Axial stiffness	Ca	N/mm	Axial stiffness of the coupling
  Radial stiffness	Cr	N/mm	Radial stiffness of the coupling
  Rated speed	nN	rpm	Coupling speed
  Maximum coupling speed	nKmax	rpm	Maximum permissible coupling speed
  Axial misalignment	ΔKa	mm	Axial misalignment of the coupling halves
  Radial misalignment	ΔKr	mm	Radial misalignment of the coupling halves
  Angular misalignment	ΔKw	°	Angular misalignment of the coupling halves

  
  
  

  Technical specifications

  Power ratings of the miniature series

  Size	Rated torque	Maximum torque	Maximum speed	Torsional stiffness	Stiffness		Permitted shaft misalignment
  					Radial	Axial
  	TKN	TKOL	nKmax	CTdyn	Cr	Ca	ΔKa	ΔKr	ΔKw
  	Nm	Nm	rpm	Nm/rad	N/mm	N/mm	mm	mm	grad
  1	0.1	0.15	15000	65	10	14	0.2	0.1	1.5
  5	0.5	0.75	15000	258	128	18	0.2	0.1	1.5
  				195	54	13	0.3	0.2	1.5
  				160	26	11	0.4	0.2	2
  10	1	1.5	15000	510	187	36	0.2	0.1	1.5
  				380	82	27	0.3	0.2	1.5
  				308	42	22	0.4	0.2	2
  15	1.5	2.25	15000	750	139	23	0.3	0.1	1.5
  				700	81	12	0.4	0.2	2
  20	2	3	15000	1510	147	18	0.3	0.2	1.5
  				1300	96	14	0.4	0.2	1.5
  				1040	46	9	0.5	0.3	2
  45	4.5	6.75	15000	6480	444	47	0.3	0.1	1.5
  				4100	108	29	0.5	0.2	2
  100	10	15	15000	8080	361	46	0.4	0.2	1.5
  				6750	193	34	0.6	0.3	2

  
  
  

  Power ratings of the standard series

  Size	Rated torque	Maximum torque	Maximum speed	Torsional stiffness	Stiffness		Permitted shaft misalignment
  					Radial	Axial
  	TKN	TKOL	nKmax	CTdyn	Cr	Ca	ΔKa	ΔKr	ΔKw
  	Nm	Nm	rpm	Nm/rad	N/mm	N/mm	mm	mm	grad
  18	18	27	12800	19	200	50	0.5	0.2	1.5
  				17	85	40	0.5	0.2	2.0
  30	30	45	10300	36	720	50	0.5	0.2	1.5
  				26	220	30	0.8	0.2	2.0
  60	60	90	8700	75	1100	90	0.5	0.2	1.5
  				50	330	55	0.8	0.2	2.0
  80	80	120	6900	128	1200	80	0.5	0.2	1.5
  				75	400	55	0.7	0.2	2.0
  150	150	225	6900	155	2000	150	0.5	0.2	1.5
  				102	600	85	0.6	0.2	2.0
  200	200	300	6400	175	2500	150	0.5	0.2	1.5
  				120	450	85	0.7	0.2	2.0
  300	300	450	6000	502	6300	280	0.5	0.2	1.5
  				282	1500	85	0.7	0.2	2.0
  500	500	750	5000	690	8800	100	0.5	0.2	1.5
  				315	1000	85	0.8	0.2	2.0
  800	800	1200	3700	760	510	190	0.8	0.2	1.8
  1400	1400	2100	3700	1300	710	280	0.8	0.2	1.8
  3000	3000	4500	2800	2800	8060	880	0.8	0.2	1.5
  5000	5000	7500	2800	4800	9190	740	0.8	0.2	1.5

  
  
  

  Permitted shaft misalignment

  The permitted shaft misalignments ΔK_a, ΔK_r und ΔK_w are maximum values and must not occur simultaneously. The following formula can be used to roughly calculate whether combinations of misalignments are permissible:

  (ΔK_ract : ΔK_r) + (ΔK_aact : ΔK_a) + (ΔK_wact : ΔK_w) < 1

  The different torsional stiffness values apply to the various lengths of metal bellows of the relevant SIPEX type.