Highly Flexible Couplings for Cardan Shafts Solutions for New Technologies

Transcription

1 A L T R A I N D U S T R I A L M O T I O N Highly Flexible Couplings for Cardan Shafts Solutions for New Technologies

2 Periflex CS Couplings Highly flexible rubber couplings with linear characteristic for connecting a cardan shaft directly to a diesel engine. The ring element can be bolted directly to the flywheel. The cardan shaft is flange-mounted to the B- of the coupling. Deflection angle of the cardan shaft of up to 5. The radial and axial forces generated by the cardan shaft are absorbed by an internal plain bearing and transmitted to the engine bearing. Torque range between 5 Nm to 14,800 Nm. Stromag IGE...FG Highly flexible rubber coupling with a progressive characteristic for connecting a cardan shaft directly to a diesel engine. For the transmission of high torques with its compact design and light weight. The coupling is flangemounted to the B- of the coupling. The cardan shaft is flange-mounted to the B- of the coupling. Deflection angle of the cardan shaft of up to 5. The radial and axial forces generated by the cardan shaft are absorbed by an internal plain bearing and transmitted to the engine bearing. Torque range between 4000 Nm to 25,000 Nm. AFL / PVN flange bearing Flange bearing as a bell that is mounted to the diesel engine. In the bell, an axial mountable Stromag PVN disc coupling is used to transfer the torque from the flywheel to the cardan shaft. The flexible element has a linear characteristic. The integrated bell bearing transfers the reaction forces from the cardan shaft to the engine housing. Deflection angle of the cardan shaft of up to 10. Torque range between 1000 Nm to 20,000 Nm. 2 Stromag P-68-SG-A4 D C 01/18

3 All issues containing details on Stromag Periflex CS prior to this publication may no longer apply. We reserve the right to modify the dimensions and constructions. Stromag products comply with the Quality Standard to DIN ISO 01. Content Page Cardan shaft coupling concept 4 Instructions for the designer 4 Instructions on choosing the coupling size 5 Storage of flexible rubber elements 5 Periflex CS Series Stromag Periflex CS output table Stromag Periflex CS dimension table Stromag AFL / PVN Series Stromag AFL / PVN output table Stromag AFL / PVN dimensions table 5 15 Stromag IGE...FG Series Stromag IGE...FG dimensions table 18 Characteristics for cardan shaft couplings 20 Coupling design, question sheet 22 P-68-SG-A4 D C 01/18... Stromag

4 The cardan shaft coupling concept The Stromag product range provides a wide range of cardan shaft couplings. The couplings are designed for use in piston machines for direct connection to a cardan shaft. The A- of the coupling can be bolted directly to an engine s flywheel. The cardan shaft is flangemounted to the B- of the coupling. The Stromag cardan shaft coupling is comprised of the combination of an element made from flexible rubber material with a bearing for the secure absorption of the reaction forces applied by a connected cardan shaft. Three different series of the cardan shaft couplings have been developed in order to satisfy the different requirements in relation to the system torque, torsional stiffness and reaction force. The highly flexible Stromag Periflex CS series designs are preferred for standard applications. The IGE series from the established highly flexible Stromag GE coupling product family is used for applications with high impact loads. The Stromag flange bearing (AFL) assembly with a disc coupling as a cardan shaft coupling is recoended for an angle of deflection greater than 5. Instructions for the designer The couplings can be used in a temperature range of between -50 C and +80 C. A specially developed synthetic rubber can be used for the AFL s disc tyre so that this can be used up to a temperature of 120 C. The flexible elements may heat up as a result of damping work and reach higher temperatures than the ambient temperature. If the coupling is housed in a protective hood or cover, this must be taken into account, or adequate ventilation and heat dissipation must be ensured. Stromag cardan shaft couplings are available with EN approval in accordance with the classification society requirements. Stromag cardan shaft couplings are available with a fail-safe device. A rupture in the flexible element causes claws to intermesh, forming a torsionally rigid, backlash connection between the drive and output s. Temporary emergency operation is possible with limited torque. Instructions on choosing the coupling size Static and dynamic characteristic values are available for the Stromag cardan shaft couplings. These values can help in the choice of a coupling size which is suitable for the specific application. The key factors for this are the loads arising from the power transmitted and torsional vibrations. Stationary operating modes must be based on T KN, T KW and P KV, while T Kmax values are to be used for nonstationary operating modes. Stromag s specialist departments can provide support with design, particularly in calculating the torsional vibrations. We therefore ask you to complete and send us the question sheet at the end of this catalog. As a rule, flexible couplings represent the predetermined mechanical breaking point of a drive train. Overloading a drive train therefore generally leads to failure of the flexible coupling element. This characteristic is intentional and protects the entire system from unexpected damage. Any consequential damage that could arise from the failure of the coupling must be taken into conration in advance by the system designer and monitored or prevented through appropriate measures. 4 Stromag P-68-SG-A4 D C 01/18

5 Storage of flexible rubber elements Periflex CS Series Highly Flexible Couplings for Cardan Shafts When stored appropriately, flexible rubber elements retain their properties over several years without any alterations. It is essential that the stored parts are protected against oxygen, ozone, light, heat, moisture and solvents. The storage temperature should no fall below +10 C and not exceed +25 C. All UV light sources are harmful and must be avoided. Equipment that generates ozone, e.g. light sources and electric motors, must be kept away from the storage location. The relative air humidity should not exceed 65%. Solvents, fuels, lubricants, chemicals, acids, disinfectants may not be kept in the same storage area. Further details can be taken from DIN 7716 und ISO Das Periflex CS Concept The Periflex CS couplings are highly flexible rubber couplings with a linear spring characteristic for connecting a cardan shaft directly to a diesel engine drive.the ring element can be bolted directly to an engine s flywheel. The cardan shaft is flange-mounted to the B- of the coupling. An deflection angle of the cardan shaft of up to 5 is generally permitted, larger angles are available on request. The series covers the torque range from 5 to 14,800 Nm. The connecting dimensions on the engine primarily conform to SAE standard J620 or DIN The cardan shaft is available in a range of metric sizes, including for Spicer, Mechanics or cross-toothed connections. The Periflex CS coupling is comprised of the combination of a ring element made from flexible rubber material with a bearing for the secure absorption of the reaction forces applied by a connected cardan shaft. The ring element is exclusively torsionally flexible. The bearing consists of an axial and radial plain bearing made from wear-free and maintenance-free composite material. The metal parts of the Periflex CS coupling are made from high-quality cast as standard. The ring element is manufactured from natural rubber (NR) in various rubber qualities and torsional stiffnesses. These allow precise adjustment to drives that are susceptible to torsional vibrations. A B DD_ P-68-SG-A4 D C 01/18... Stromag

6 Stromag Periflex CS output table Coupling Size CS 13 CS 21 CS 22 CS 31 CS 32 CS 41 CS 42 CS 43 CS 51 CS 52 Element Nominal Torque T KN Nm T Kmax1 Nm 1) Maximum Torque T Kmax2 Nm 2) Adm. Alternating Torque T KW Nm Adm. Speed n max rpm Torsional Stiffness C T dyn knm/rad 3) 4) Relative Damping y 3) 4) Adm. Damping Power P KV W 5) 1) For periodic, short-term vibrations during start-stop, switching, etc. 2) For rare peak loads, e.g. generator short-circuit 3) For: T W = 0.2 T KN ; T = 0.8 T KN ; f = 10 Hz; ϑ = 30 C 4) Material-related tolerances as high as ±15% are possible. 5) The P KV value describes the damping performance that can be absorbed over minutes. Permanently absorbable damping performance P KV = 0.5 P KV 6 Stromag P-68-SG-A4 D C 01/18

7 Stromag Periflex CS dimension table Highly Flexible Couplings for Cardan Shafts A Metric, external cardan shaft connection Size CS 13 CS 21 CS 22 SAE connection ½ 10 11½ Cardan flange B DD Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 * e x xM x xM x11 6xM xM xM xM xM8 6xM8 8xM8 47 4xM8 6xM8 8xM8 47 4xM xM xM xM xM xM8 254 Lengths l 1 I 2 l 3 l 4 l 5 l 6 l Mass moment of inertia kgm 2 J A J B Mass kg P-68-SG-A4 D C 01/18... Stromag

8 Stromag Periflex CS dimension table A B DD Metric, external cardan shaft connection Size CS 31 CS 32 SAE connection 11½ 14 11½ 14 Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 e 6xM xM xM x 6xM x 8xM x 130 8xM xM xM12 3 8xM14 8xM16 3 8x 8xM8 3 8x 130 8xM12 3 8x 8xM14 8xM16 3 Lengths l 1 I 2 l 3 l 4 l 5 l 6 l Mass moment of inertia kgm 2 J A J B Mass kg Stromag P-68-SG-A4 D C 01/18

9 Stromag Periflex CS dimension table Highly Flexible Couplings for Cardan Shafts A Metric, external cardan shaft connection B DD Size CS 41 CS 42 CS 43 SAE connection Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 e 130 8xM12 4 8xM14 10xM xM xM12 4 8xM14 10xM xM16 4 8xM14 10xM16 6 8xM xM x 8xM14 10Xm x 6 8xM x 218 8xM x.5 8xM14 10xM x.5 6 8xM x xM18 Lengths l 1 I 2 l 3 l 4 l 5 l 6 l Mass moment of inertia kgm 2 J A J B Mass kg P-68-SG-A4 D C 01/18... Stromag

10 Stromag Periflex CS dimension table A B DD Metric, external cardan shaft connection Size CS 51 CS 52 SAE connection Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 e x.5 6 8xM x xM x xM x xM x xM Lengths l 1 I 2 l 3 l 4 l 5 l 6 l Mass moment of inertia kgm 2 J A J B Mass kg Stromag P-68-SG-A4 D C 01/18

11 Stromag Periflex CS dimension table Highly Flexible Couplings for Cardan Shafts A Metric, internal cardan shaft connection B Size CS 13 CS 21 CS 22 DD SAE connection ½ 10 11½ Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 * e x x x x x11 6x x x x x8.1 6x8.1 8x x8.1 6x8.1 8x x x x x x x Lengths l 1 I 2 l 3 l 4 l 5 l 6 l 7 I Mass moment of inertia kgm 2 J A J B Mass kg P-68-SG-A4 D C 01/18... Stromag

12 Stromag Periflex CS dimension table A B DD Metric, internal cardan shaft connection Size CS 31 CS 32 SAE connection 11½ 14 11½ 14 Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 e 6x x x x 6x x 8x x 130 8x x x x x x 8x x 130 8x x 8x x Lengths l 1 I 2 l 3 l 4 l 5 l 6 l 7 I Mass moment of inertia kgm 2 J A J B Mass kg Stromag P-68-SG-A4 D C 01/18

13 Stromag Periflex CS dimension table Highly Flexible Couplings for Cardan Shafts A Metric, internal cardan shaft connection B Size CS 41 CS 42 CS 43 DD SAE connection Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 e 130 8x x x x x12.1 8x x x16.1 8x x x x 8x x x 6 8x x.5 8x x x.5 6 8xM16 Lengths l 1 I 2 l 3 l 4 l 5 l 6 l 7 l Mass moment of inertia kgm 2 J A J B Mass kg P-68-SG-A4 D C 01/18... Stromag

14 Stromag Periflex CS dimension table A B DD Metric, internal cardan shaft connection Size CS 51 CS 52 SAE connection Cardan flange Diameter a 1 b 1 c 1 k 1 b 2 c 2 k 2 e x.5 6 8x x x x x x x x x Lengths l 1 I 2 l 3 l 4 l 5 l 6 l 7 I Mass moment of inertia kgm 2 J A J B Mass kg Stromag P-68-SG-A4 D C 01/18

15 Stromag AFL / PVN Series DD_ The flange bearing is a bell that is mounted to the diesel engine. An axially mountable, plug-in, highly flexible Stromag Periflex disc tyre arranged in the bell transmits the torque from the flywheel to the cardan shaft. The disc tyre has a linear spring characteristic and ensures the balanced torsional vibration behavior of the system, while the integrated bearing transmits the cardan shaft s reaction forces to the engine housing via the bell. This means that the crank shaft bearings are not exposed to the reaction forces. As a rule, the AFL can be use up to a deflection angle of 10, larger deflection angles are possible on request, depending on the operating conditions. The torque transferred by the series is determined by the Stromag Periflex disc tyre used. The torque range extends from 1000 Nm to 20,000 Nm. The bell s connecting dimensions to the engine housing are based on SAE standard J6. The connecting dimensions to the flywheel on the engine primarily conform to SAE standard J620 or DIN The cardan shaft is available in a range of metric sizes, including for Spicer, Mechanics or crosstoothed connections on request. The flange bearing s bell and the connection ring are manufactured from high-quality cast aluminum, while the other metal parts are steel. The Stromag Periflex disc tyre is manufactured from natural rubber (NR) or a synthetic rubber in various torsion spring stiffnesses. These allow an adjustment to drives that are susceptible to torsional vibrations. P-68-SG-A4 D C 01/18... Stromag

16 Stromag AFL / PVN output table Coupling size Tyre Nominal torque T KN Nm Maximum torque T Kmax (1) Nm Adm. alternating torque T KW Nm Torsional stiffness C T dyn 2) 4) Nm/rad Relative damping ψ 2) 4) Adm. Damping Power P KV 3) 5) W PVN PVN PVN PVN PVN PVN PVN PVN 549 PVN ) The values listed in the tables refer to the characteristic values of the disc tyre. 2) For: T W = 0,2 T KN ; T = 0,8 T KN ; f = 10 Hz; ϑ = 30 C Temperature factor S ϑpkv 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0, Ambient temperature [ºC] 3) When coupling temperatures are higher than 30 C, this value must be reduced by the temperature factor. 4) Material-related tolerances as high as ±15% are possible. 5) The P KV value describes the damping performance that can be absorbed over minutes. The damping power that can be absorbed permanently is P KV = 0,5 P KV. 16 Stromag P-68-SG-A4 D C 01/18

17 Stromag AFL / PVN dimension table Highly Flexible Couplings for Cardan Shafts Engine housing Bores for srews K Flywheel DD Housing SAE J6 Flywheel SAE J620 Coupling size Adm. Speed n max min -1 a b f Diameter c e k u Length t l Cardan shaft d 2 11½" PVN 350 PVN x 8x ½" PVN x 11 8x " PVN 430 PVN 433 PVN 439 PVN x 11 8x " 18" PVN 433 PVN 439 PVN 436 PVN 544 PVN x 8x x 12x " PVN 544 PVN x 12x " PVN x 12x P-68-SG-A4 D C 01/18... Stromag

18 Stromag IGE...FG Series Stromag IGE...FG Concept The Stromag IGE...FG is a highly flexible rubber coupling with a progressive characteristic (see figure). It is ideal for the transmission of high torques with its particularly compact design and light weight. The coupling s outer part can be connected directly to a diesel engine s flywheel or similar. The torque is transmitted to the hub and the cardan shaft via rubber elements arranged in a star pattern. The inner part of the coupling, consisting of the hub and support flange, is radially supported in the outer part of the coupling via the shaft and bushing and fixed in the axial direction using rings. The radial and axial forces generated by the cardan shaft are absorbed by the coupling and transmitted to the main engine bearing. The series extends across a nominal torque range from 4000 Nm to 25,000 Nm. The Stromag IGE...FG is manufactured exclusively from metal or high-quality cast parts. They are manufactured from turned parts to ensure that they run smoothly and quietly. Verdrehwinkel ϕ The Stromag IGE...FG coupling is ideal for absorbing large impact torques due to the use of rubber elements with embedded extremely strong fabric. Large alternating torques are also permitted, as the damping heat is easily dissipated via the space between the individual elements. DD_ Stromag IGE...FG output table IGE- Coupling size Nominal torque T KN Nm Maximum torque T Kmax Nm Adm. alternating torque T WzuL (at...% preload) [knm/rad] Dyn. Torsional stiffness C T dyn (at...% preload) [knm/rad] 1) 2) Adm. Speed n max rpm Relative damping Ψ 1) 2) Adm. damping power P KV [W] 3) 10 % 25 % 50 % % 100 % 10 % 25 % 50 % % 100 % ) For: T W = 0,2 T KN ; f = 10 Hz 2) Material-related tolerances as high as ±15% are possible. 3) The P KV value describes the damping performance that can be absorbed over minutes. Permanently absorbable damping performance P KV = 0,5 P KV 18 Stromag P-68-SG-A4 D C 01/18

19 Stromag IGE...FG dimension table Highly Flexible Couplings for Cardan Shafts A B DD Coupling size Cardan flange Diameter a b c e 1 f 1 g 1 g 2 k 1 k xM x.5 8xM x.5 8xM x22 8xM22 Lenght l 3 n 2 s 1 s 2 t 1 w Mass kg G ges Mass moment of inertia kgm² J i 0.23 J a P-68-SG-A4 D C 01/18... Stromag

20 Characteristics for cardan shaft couplings T KN The coupling s nominal torque can be continuously transmitted over the whole permitted speed range. It must not be exceeded by the system s nominal torque T N. T KN T N T Kmax1 The coupling s maximum torque T Kmax1 can be endured as a peak load and may not be exceeded by normal, non stationary system peak torques T max1. A system s normal non-stationary modes are unavoidable and occur repeatedly (e.g.: starting/stopping processes, resonance pass, switching processes, acceleration processes, etc.). T Kmax1 T max1 T Kmax2 The coupling s maximum torque T Kmax2 can be endured as a rarely occurring peak load and may not be exceeded by normal, non-stationary system peak torques T max2. Anomalous, non-stationary system peak torques are avoidable and are not part of the planned operating scheme (e.g.: emergency stop, sync failure, short circuit, etc.). A coupling overload due to anomalous, non-stationary system peak torques T max2 shortens the system s service life and is tolerated in individual cases. T Kmax2 T max2 T Kw The admissible permanent alternating torque indicates the amplitude of the admissible permanent periodic torque fluctuation. This torque may be superimposed on a base load of T KN. In this process, the max damping power P KV must also be checked. DD Stromag P-68-SG-A4 D C 01/18

21 Characteristics for cardan shaft couplings Highly Flexible Couplings for Cardan Shafts C Tdyn The dynamic torsional stiffness indicates the ratio of torque amplitude to torsion angle amplitude during an oscillation. The torque amplitude is superimposed on an initial load (coupling torque). For couplings with a linear characteristic (Stromag Periflex CS and AFL), the C Tdyn value over the coupling torque is constant. However, it changes depending on the amplitude, the frequency and the temperature of the flexible element. C Tdyn data relate to a coupling torque of 0,8 T KN, an alternating torque of 0,2 T KN and a frequency of 10 Hz for a coupling at operating temperature with a surface temperature of about 30 C. Stromag IGE coupling has a progressive characteristic. I.e. the C Tdyn value also changes depending on the coupling torque. C Tdyn = T el ϕ w Ψ The relative damping is a measure of the ability of the coupling to convert part of the vibration energy into heat. The damping can be determined using the damping loop (hysteresis loop). A el surface represents the flexible strain energy W el during a load. The A D surface is a measure for the damping work W D during a vibration cycle. The Y data relate to a coupling torque of 0.8 T KN, an alternating torque of 0.2 T KN and a frequency of 10 Hz for a coupling at operating temperature with a surface temperature of about 30 C. Ψ = W D W el = A D A el P kv The permitted damping power indicates how much damping (heat) the coupling can permanently absorb and dissipate. The sum of the damping performance from every vibration order (i.e. P Vi ) must be less than the coupling s damping performance. P vi = π 2π Ψ T wi f i C Tdyn P KV P Vi P KV value describes the damping performance that can be absorbed over an hour. P KV value needs to be multiplied by a factor of 0.5 to determine the damping performance that can be permanently absorbed (P KV ). P-68-SG-A4 D C 01/18... Stromag

22 Coupling design, question sheet Main engine Engine type (electric, combustion engine, etc.) Engine make (manufacturer, type) Engine installation (rigid, flexible) Engine housing, SAE Flywheel centering diameter Nominal power Nominal speed Speed range Nominal torque Maximum torque (breakdown torque) () (kw) (rpm) (rpm) (Nm) (Nm) Mass moment of inertia (kgm 2 ) Number of start-ups or reversals every hour Cardan shaft Deflection angle ( ) Type of cardan shaft deflection ( z or w ) Cardan shaft type (manufacturer, size) Length of the cardan shaft () Slide coated splines? Yes/No Mass moment of inertia (kgm 2 ) Gear unit Gear ratio Mass moment of inertia (kgm 2 ) Type (generator, ventilator, compressor, fixed or variable pitch propeller) Main or auxiliary drive Main engine Design type (stand-alone or flange-mounted) Mass moment of inertia (kgm 2 ) Coupling Location in the drive train (enclose schematic diagram) Ambient temperature (ºC, ºK) Classification society Ship type Ice class 22 Stromag P-68-SG-A4 D C 01/18

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